зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
2.3 KiB
JavaScript
86 строки
2.3 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2; fill-column: 80 -*- */
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/* vim:set ts=2 sw=2 sts=2 et tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const wasmparser = require("devtools/client/shared/vendor/WasmParser");
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const wasmdis = require("devtools/client/shared/vendor/WasmDis");
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const wasmStates = new WeakMap();
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function getWasmText(subject, data) {
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let parser = new wasmparser.BinaryReader();
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parser.setData(data.buffer, 0, data.length);
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let dis = new wasmdis.WasmDisassembler();
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dis.addOffsets = true;
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let done = dis.disassembleChunk(parser);
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let result = dis.getResult();
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if (result.lines.length === 0) {
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result = { lines: ["No luck with wast conversion"], offsets: [0], done, };
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}
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let offsets = result.offsets, lines = [];
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for (let i = 0; i < offsets.length; i++) {
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lines[offsets[i]] = i;
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}
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wasmStates.set(subject, { offsets, lines, });
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return { lines: result.lines, done: result.done };
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}
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function getWasmLineNumberFormatter(subject) {
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const codeOf0 = 48, codeOfA = 65;
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let buffer =
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[codeOf0, codeOf0, codeOf0, codeOf0, codeOf0, codeOf0, codeOf0, codeOf0];
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let last0 = 7;
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return function (number) {
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let offset = lineToWasmOffset(subject, number - 1);
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if (offset === undefined) {
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return "";
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}
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let i = 7;
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for (let n = offset | 0; n !== 0 && i >= 0; n >>= 4, i--) {
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let nibble = n & 15;
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buffer[i] = nibble < 10 ? codeOf0 + nibble : codeOfA - 10 + nibble;
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}
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for (let j = i; j > last0; j--) {
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buffer[j] = codeOf0;
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}
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last0 = i;
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return String.fromCharCode.apply(null, buffer);
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};
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}
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function isWasm(subject) {
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return wasmStates.has(subject);
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}
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function lineToWasmOffset(subject, number) {
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let wasmState = wasmStates.get(subject);
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if (!wasmState) {
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return undefined;
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}
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let offset = wasmState.offsets[number];
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while (offset === undefined && number > 0) {
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offset = wasmState.offsets[--number];
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}
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return offset;
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}
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function wasmOffsetToLine(subject, offset) {
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let wasmState = wasmStates.get(subject);
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return wasmState.lines[offset];
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}
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module.exports = {
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getWasmText,
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getWasmLineNumberFormatter,
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isWasm,
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lineToWasmOffset,
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wasmOffsetToLine,
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};
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