afdabcfd0b
This is a fix for performance regression. For new Uint8Array(arrayLike) and the likes, we allocate the backing store of typed array uninitialized and then proceed to feel it in with elements of arrayLike. If the loop over arrayLike runs to completion, we know that all elements of typed arrays had been assigned to and there is no uninitialized memory. If the loop does not run to completion, we propagate the exception to constructor caller, therefore the typed array is not exposed to user program. BUG=270507 R=yangguo@chromium.org Review URL: https://codereview.chromium.org/23463050 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16914 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
598 lines
20 KiB
JavaScript
598 lines
20 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"use strict";
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// This file relies on the fact that the following declaration has been made
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// in runtime.js:
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// var $Array = global.Array;
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// --------------- Typed Arrays ---------------------
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function CreateTypedArrayConstructor(name, elementSize, arrayId, constructor) {
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function ConstructByArrayBuffer(obj, buffer, byteOffset, length) {
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var offset = ToPositiveInteger(byteOffset, "invalid_typed_array_length")
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if (offset % elementSize !== 0) {
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throw MakeRangeError("invalid_typed_array_alignment",
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"start offset", name, elementSize);
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}
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var bufferByteLength = %ArrayBufferGetByteLength(buffer);
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if (offset > bufferByteLength) {
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throw MakeRangeError("invalid_typed_array_offset");
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}
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var newByteLength;
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var newLength;
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if (IS_UNDEFINED(length)) {
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if (bufferByteLength % elementSize !== 0) {
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throw MakeRangeError("invalid_typed_array_alignment",
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"byte length", name, elementSize);
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}
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newByteLength = bufferByteLength - offset;
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newLength = newByteLength / elementSize;
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} else {
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var newLength = ToPositiveInteger(length, "invalid_typed_array_length");
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newByteLength = newLength * elementSize;
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}
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if (offset + newByteLength > bufferByteLength) {
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throw MakeRangeError("invalid_typed_array_length");
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}
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%TypedArrayInitialize(obj, arrayId, buffer, offset, newByteLength);
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}
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function ConstructByLength(obj, length) {
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var l = ToPositiveInteger(length, "invalid_typed_array_length");
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var byteLength = l * elementSize;
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var buffer = new global.ArrayBuffer(byteLength);
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%TypedArrayInitialize(obj, arrayId, buffer, 0, byteLength);
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}
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function ConstructByArrayLike(obj, arrayLike) {
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var length = arrayLike.length;
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var l = ToPositiveInteger(length, "invalid_typed_array_length");
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if(!%TypedArrayInitializeFromArrayLike(obj, arrayId, arrayLike, l)) {
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for (var i = 0; i < l; i++) {
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// It is crucial that we let any execptions from arrayLike[i]
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// propagate outside the function.
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obj[i] = arrayLike[i];
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}
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}
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}
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return function (arg1, arg2, arg3) {
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if (%_IsConstructCall()) {
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if (IS_ARRAYBUFFER(arg1)) {
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ConstructByArrayBuffer(this, arg1, arg2, arg3);
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} else if (IS_NUMBER(arg1) || IS_STRING(arg1) ||
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IS_BOOLEAN(arg1) || IS_UNDEFINED(arg1)) {
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ConstructByLength(this, arg1);
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} else {
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ConstructByArrayLike(this, arg1);
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}
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} else {
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throw MakeTypeError("constructor_not_function", [name])
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}
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}
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}
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function TypedArrayGetBuffer() {
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return %TypedArrayGetBuffer(this);
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}
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function TypedArrayGetByteLength() {
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return %TypedArrayGetByteLength(this);
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}
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function TypedArrayGetByteOffset() {
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return %TypedArrayGetByteOffset(this);
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}
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function TypedArrayGetLength() {
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return %TypedArrayGetLength(this);
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}
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function CreateSubArray(elementSize, constructor) {
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return function(begin, end) {
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var srcLength = %TypedArrayGetLength(this);
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var beginInt = TO_INTEGER(begin);
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if (beginInt < 0) {
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beginInt = MathMax(0, srcLength + beginInt);
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} else {
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beginInt = MathMin(srcLength, beginInt);
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}
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var endInt = IS_UNDEFINED(end) ? srcLength : TO_INTEGER(end);
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if (endInt < 0) {
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endInt = MathMax(0, srcLength + endInt);
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} else {
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endInt = MathMin(endInt, srcLength);
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}
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if (endInt < beginInt) {
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endInt = beginInt;
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}
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var newLength = endInt - beginInt;
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var beginByteOffset =
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%TypedArrayGetByteOffset(this) + beginInt * elementSize;
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return new constructor(%TypedArrayGetBuffer(this),
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beginByteOffset, newLength);
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}
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}
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function TypedArraySetFromArrayLike(target, source, sourceLength, offset) {
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if (offset > 0) {
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for (var i = 0; i < sourceLength; i++) {
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target[offset + i] = source[i];
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}
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}
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else {
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for (var i = 0; i < sourceLength; i++) {
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target[i] = source[i];
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}
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}
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}
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function TypedArraySetFromOverlappingTypedArray(target, source, offset) {
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var sourceElementSize = source.BYTES_PER_ELEMENT;
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var targetElementSize = target.BYTES_PER_ELEMENT;
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var sourceLength = source.length;
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// Copy left part.
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function CopyLeftPart() {
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// First un-mutated byte after the next write
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var targetPtr = target.byteOffset + (offset + 1) * targetElementSize;
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// Next read at sourcePtr. We do not care for memory changing before
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// sourcePtr - we have already copied it.
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var sourcePtr = source.byteOffset;
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for (var leftIndex = 0;
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leftIndex < sourceLength && targetPtr <= sourcePtr;
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leftIndex++) {
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target[offset + leftIndex] = source[leftIndex];
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targetPtr += targetElementSize;
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sourcePtr += sourceElementSize;
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}
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return leftIndex;
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}
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var leftIndex = CopyLeftPart();
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// Copy rigth part;
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function CopyRightPart() {
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// First unmutated byte before the next write
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var targetPtr =
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target.byteOffset + (offset + sourceLength - 1) * targetElementSize;
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// Next read before sourcePtr. We do not care for memory changing after
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// sourcePtr - we have already copied it.
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var sourcePtr =
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source.byteOffset + sourceLength * sourceElementSize;
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for(var rightIndex = sourceLength - 1;
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rightIndex >= leftIndex && targetPtr >= sourcePtr;
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rightIndex--) {
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target[offset + rightIndex] = source[rightIndex];
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targetPtr -= targetElementSize;
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sourcePtr -= sourceElementSize;
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}
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return rightIndex;
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}
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var rightIndex = CopyRightPart();
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var temp = new $Array(rightIndex + 1 - leftIndex);
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for (var i = leftIndex; i <= rightIndex; i++) {
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temp[i - leftIndex] = source[i];
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}
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for (i = leftIndex; i <= rightIndex; i++) {
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target[offset + i] = temp[i - leftIndex];
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}
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}
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function TypedArraySet(obj, offset) {
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var intOffset = IS_UNDEFINED(offset) ? 0 : TO_INTEGER(offset);
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if (intOffset < 0) {
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throw MakeTypeError("typed_array_set_negative_offset");
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}
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switch (%TypedArraySetFastCases(this, obj, intOffset)) {
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// These numbers should be synchronized with runtime.cc.
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case 0: // TYPED_ARRAY_SET_TYPED_ARRAY_SAME_TYPE
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return;
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case 1: // TYPED_ARRAY_SET_TYPED_ARRAY_OVERLAPPING
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TypedArraySetFromOverlappingTypedArray(this, obj, intOffset);
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return;
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case 2: // TYPED_ARRAY_SET_TYPED_ARRAY_NONOVERLAPPING
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TypedArraySetFromArrayLike(this, obj, obj.length, intOffset);
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return;
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case 3: // TYPED_ARRAY_SET_NON_TYPED_ARRAY
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var l = obj.length;
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if (IS_UNDEFINED(l)) {
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if (IS_NUMBER(obj)) {
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// For number as a first argument, throw TypeError
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// instead of silently ignoring the call, so that
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// the user knows (s)he did something wrong.
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// (Consistent with Firefox and Blink/WebKit)
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throw MakeTypeError("invalid_argument");
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}
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return;
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}
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if (intOffset + l > this.length) {
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throw MakeRangeError("typed_array_set_source_too_large");
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}
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TypedArraySetFromArrayLike(this, obj, l, intOffset);
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return;
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}
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}
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// -------------------------------------------------------------------
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function SetupTypedArray(arrayId, name, constructor, elementSize) {
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%CheckIsBootstrapping();
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var fun = CreateTypedArrayConstructor(name, elementSize,
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arrayId, constructor);
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%SetCode(constructor, fun);
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%FunctionSetPrototype(constructor, new $Object());
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%SetProperty(constructor, "BYTES_PER_ELEMENT", elementSize,
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READ_ONLY | DONT_ENUM | DONT_DELETE);
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%SetProperty(constructor.prototype,
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"constructor", constructor, DONT_ENUM);
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%SetProperty(constructor.prototype,
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"BYTES_PER_ELEMENT", elementSize,
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READ_ONLY | DONT_ENUM | DONT_DELETE);
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InstallGetter(constructor.prototype, "buffer", TypedArrayGetBuffer);
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InstallGetter(constructor.prototype, "byteOffset", TypedArrayGetByteOffset);
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InstallGetter(constructor.prototype, "byteLength", TypedArrayGetByteLength);
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InstallGetter(constructor.prototype, "length", TypedArrayGetLength);
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InstallFunctions(constructor.prototype, DONT_ENUM, $Array(
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"subarray", CreateSubArray(elementSize, constructor),
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"set", TypedArraySet
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));
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}
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// arrayIds below should be synchronized with Runtime_TypedArrayInitialize.
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SetupTypedArray(1, "Uint8Array", global.Uint8Array, 1);
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SetupTypedArray(2, "Int8Array", global.Int8Array, 1);
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SetupTypedArray(3, "Uint16Array", global.Uint16Array, 2);
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SetupTypedArray(4, "Int16Array", global.Int16Array, 2);
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SetupTypedArray(5, "Uint32Array", global.Uint32Array, 4);
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SetupTypedArray(6, "Int32Array", global.Int32Array, 4);
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SetupTypedArray(7, "Float32Array", global.Float32Array, 4);
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SetupTypedArray(8, "Float64Array", global.Float64Array, 8);
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SetupTypedArray(9, "Uint8ClampedArray", global.Uint8ClampedArray, 1);
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// --------------------------- DataView -----------------------------
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var $DataView = global.DataView;
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function DataViewConstructor(buffer, byteOffset, byteLength) { // length = 3
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if (%_IsConstructCall()) {
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if (!IS_ARRAYBUFFER(buffer)) {
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throw MakeTypeError('data_view_not_array_buffer', []);
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}
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var bufferByteLength = %ArrayBufferGetByteLength(buffer);
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var offset = ToPositiveInteger(byteOffset, 'invalid_data_view_offset');
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if (offset > bufferByteLength) {
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throw MakeRangeError('invalid_data_view_offset');
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}
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var length = IS_UNDEFINED(byteLength) ?
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bufferByteLength - offset : TO_INTEGER(byteLength);
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if (length < 0 || offset + length > bufferByteLength) {
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throw new MakeRangeError('invalid_data_view_length');
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}
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%DataViewInitialize(this, buffer, offset, length);
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} else {
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throw MakeTypeError('constructor_not_function', ["DataView"]);
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}
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}
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function DataViewGetBuffer() {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.buffer', this]);
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}
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return %DataViewGetBuffer(this);
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}
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function DataViewGetByteOffset() {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.byteOffset', this]);
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}
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return %DataViewGetByteOffset(this);
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}
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function DataViewGetByteLength() {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.byteLength', this]);
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}
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return %DataViewGetByteLength(this);
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}
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function ToPositiveDataViewOffset(offset) {
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return ToPositiveInteger(offset, 'invalid_data_view_accessor_offset');
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}
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function DataViewGetInt8(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getInt8', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetInt8(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetInt8(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setInt8', this]);
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}
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if (%_ArgumentsLength() < 2) {
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throw MakeTypeError('invalid_argument');
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}
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%DataViewSetInt8(this,
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ToPositiveDataViewOffset(offset),
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TO_NUMBER_INLINE(value),
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!!little_endian);
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}
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function DataViewGetUint8(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getUint8', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetUint8(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetUint8(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setUint8', this]);
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}
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if (%_ArgumentsLength() < 2) {
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throw MakeTypeError('invalid_argument');
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}
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%DataViewSetUint8(this,
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ToPositiveDataViewOffset(offset),
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TO_NUMBER_INLINE(value),
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!!little_endian);
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}
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function DataViewGetInt16(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getInt16', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetInt16(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetInt16(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setInt16', this]);
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}
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if (%_ArgumentsLength() < 2) {
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throw MakeTypeError('invalid_argument');
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}
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%DataViewSetInt16(this,
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ToPositiveDataViewOffset(offset),
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TO_NUMBER_INLINE(value),
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!!little_endian);
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}
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function DataViewGetUint16(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getUint16', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetUint16(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetUint16(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setUint16', this]);
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}
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if (%_ArgumentsLength() < 2) {
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throw MakeTypeError('invalid_argument');
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}
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%DataViewSetUint16(this,
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ToPositiveDataViewOffset(offset),
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TO_NUMBER_INLINE(value),
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!!little_endian);
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}
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function DataViewGetInt32(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getInt32', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetInt32(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetInt32(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setInt32', this]);
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}
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if (%_ArgumentsLength() < 2) {
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throw MakeTypeError('invalid_argument');
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}
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%DataViewSetInt32(this,
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ToPositiveDataViewOffset(offset),
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TO_NUMBER_INLINE(value),
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!!little_endian);
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}
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function DataViewGetUint32(offset, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.getUint32', this]);
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}
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if (%_ArgumentsLength() < 1) {
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throw MakeTypeError('invalid_argument');
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}
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return %DataViewGetUint32(this,
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ToPositiveDataViewOffset(offset),
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!!little_endian);
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}
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function DataViewSetUint32(offset, value, little_endian) {
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if (!IS_DATAVIEW(this)) {
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throw MakeTypeError('incompatible_method_receiver',
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['DataView.setUint32', this]);
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}
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if (%_ArgumentsLength() < 2) {
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|
throw MakeTypeError('invalid_argument');
|
|
}
|
|
%DataViewSetUint32(this,
|
|
ToPositiveDataViewOffset(offset),
|
|
TO_NUMBER_INLINE(value),
|
|
!!little_endian);
|
|
}
|
|
|
|
function DataViewGetFloat32(offset, little_endian) {
|
|
if (!IS_DATAVIEW(this)) {
|
|
throw MakeTypeError('incompatible_method_receiver',
|
|
['DataView.getFloat32', this]);
|
|
}
|
|
if (%_ArgumentsLength() < 1) {
|
|
throw MakeTypeError('invalid_argument');
|
|
}
|
|
return %DataViewGetFloat32(this,
|
|
ToPositiveDataViewOffset(offset),
|
|
!!little_endian);
|
|
}
|
|
|
|
function DataViewSetFloat32(offset, value, little_endian) {
|
|
if (!IS_DATAVIEW(this)) {
|
|
throw MakeTypeError('incompatible_method_receiver',
|
|
['DataView.setFloat32', this]);
|
|
}
|
|
if (%_ArgumentsLength() < 2) {
|
|
throw MakeTypeError('invalid_argument');
|
|
}
|
|
%DataViewSetFloat32(this,
|
|
ToPositiveDataViewOffset(offset),
|
|
TO_NUMBER_INLINE(value),
|
|
!!little_endian);
|
|
}
|
|
|
|
function DataViewGetFloat64(offset, little_endian) {
|
|
if (!IS_DATAVIEW(this)) {
|
|
throw MakeTypeError('incompatible_method_receiver',
|
|
['DataView.getFloat64', this]);
|
|
}
|
|
if (%_ArgumentsLength() < 1) {
|
|
throw MakeTypeError('invalid_argument');
|
|
}
|
|
return %DataViewGetFloat64(this,
|
|
ToPositiveDataViewOffset(offset),
|
|
!!little_endian);
|
|
}
|
|
|
|
function DataViewSetFloat64(offset, value, little_endian) {
|
|
if (!IS_DATAVIEW(this)) {
|
|
throw MakeTypeError('incompatible_method_receiver',
|
|
['DataView.setFloat64', this]);
|
|
}
|
|
if (%_ArgumentsLength() < 2) {
|
|
throw MakeTypeError('invalid_argument');
|
|
}
|
|
%DataViewSetFloat64(this,
|
|
ToPositiveDataViewOffset(offset),
|
|
TO_NUMBER_INLINE(value),
|
|
!!little_endian);
|
|
}
|
|
|
|
function SetupDataView() {
|
|
%CheckIsBootstrapping();
|
|
|
|
// Setup the DataView constructor.
|
|
%SetCode($DataView, DataViewConstructor);
|
|
%FunctionSetPrototype($DataView, new $Object);
|
|
|
|
// Set up constructor property on the DataView prototype.
|
|
%SetProperty($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,
|
|
"setInt8", DataViewSetInt8,
|
|
|
|
"getUint8", DataViewGetUint8,
|
|
"setUint8", DataViewSetUint8,
|
|
|
|
"getInt16", DataViewGetInt16,
|
|
"setInt16", DataViewSetInt16,
|
|
|
|
"getUint16", DataViewGetUint16,
|
|
"setUint16", DataViewSetUint16,
|
|
|
|
"getInt32", DataViewGetInt32,
|
|
"setInt32", DataViewSetInt32,
|
|
|
|
"getUint32", DataViewGetUint32,
|
|
"setUint32", DataViewSetUint32,
|
|
|
|
"getFloat32", DataViewGetFloat32,
|
|
"setFloat32", DataViewSetFloat32,
|
|
|
|
"getFloat64", DataViewGetFloat64,
|
|
"setFloat64", DataViewSetFloat64
|
|
));
|
|
}
|
|
|
|
SetupDataView();
|