9ca534b98d
Pulls out the CppFiltParser work into a worker to run in the background and avoid the jank induced by the final convertSymsMapToExpectedSymFormat call. Profiling shows that after this change there is virtually no jank when asking the geckoProfiler API for symbols. MozReview-Commit-ID: CAKMvjLa4dl
69 lines
1.9 KiB
JavaScript
69 lines
1.9 KiB
JavaScript
/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set sts=2 sw=2 et tw=80: */
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"use strict";
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/* exported ParseSymbols */
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var EXPORTED_SYMBOLS = ["ParseSymbols"];
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function convertStringArrayToUint8BufferWithIndex(array, approximateLength) {
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const index = new Uint32Array(array.length + 1);
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const textEncoder = new TextEncoder();
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let buffer = new Uint8Array(approximateLength);
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let pos = 0;
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for (let i = 0; i < array.length; i++) {
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const encodedString = textEncoder.encode(array[i]);
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let size = pos + buffer.length;
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if (size < buffer.length) {
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size = 2 << Math.log(size) / Math.log(2);
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let newBuffer = new Uint8Array(size);
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newBuffer.set(buffer);
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buffer = newBuffer;
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}
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buffer.set(encodedString, pos);
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index[i] = pos;
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pos += encodedString.length;
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}
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index[array.length] = pos;
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return {index, buffer};
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}
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function convertSymsMapToExpectedSymFormat(syms, approximateSymLength) {
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const addresses = Array.from(syms.keys());
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addresses.sort((a, b) => a - b);
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const symsArray = addresses.map(addr => syms.get(addr));
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const {index, buffer} =
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convertStringArrayToUint8BufferWithIndex(symsArray, approximateSymLength);
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return [new Uint32Array(addresses), index, buffer];
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}
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function convertSymsArrayToExpectedSymFormat(symsArray, approximateSymLength) {
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const {index, buffer} =
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convertStringArrayToUint8BufferWithIndex(symsArray, approximateSymLength);
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return [index, buffer];
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}
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function convertSymsMapToDemanglerFormat(syms) {
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const addresses = Array.from(syms.keys());
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addresses.sort((a, b) => a - b);
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const symsArray = addresses.map(addr => syms.get(addr));
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const textEncoder = new TextEncoder();
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const buffer = textEncoder.encode(symsArray.join("\n"));
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return [new Uint32Array(addresses), buffer];
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}
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var ParseSymbols = {
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convertSymsMapToExpectedSymFormat,
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convertSymsArrayToExpectedSymFormat,
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convertSymsMapToDemanglerFormat,
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};
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