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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
import { BinaryReader } from "devtools/client/shared/vendor/WasmParser";
import {
WasmDisassembler,
NameSectionReader,
} from "devtools/client/shared/vendor/WasmDis";
var wasmStates = Object.create(null);
function maybeWasmSectionNameResolver(data) {
try {
const parser = new BinaryReader();
parser.setData(data.buffer, 0, data.length);
const reader = new NameSectionReader();
reader.read(parser);
return reader.hasValidNames() ? reader.getNameResolver() : null;
} catch (ex) {
// Ignoring any errors during names section retrival.
return null;
}
}
/**
* @memberof utils/wasm
* @static
*/
export function getWasmText(sourceId, data) {
const nameResolver = maybeWasmSectionNameResolver(data);
const parser = new BinaryReader();
let result;
parser.setData(data.buffer, 0, data.length);
const dis = new WasmDisassembler();
if (nameResolver) {
dis.nameResolver = nameResolver;
}
dis.addOffsets = true;
try {
const done = dis.disassembleChunk(parser);
result = dis.getResult();
if (result.lines.length === 0) {
result = { lines: ["No luck with wast conversion"], offsets: [0], done };
}
} catch (e) {
result = {
lines: [`Error occured during wast conversion : ${e.message}`],
offsets: [0],
done: null,
};
}
const { offsets } = result;
const lines = [];
for (let i = 0; i < offsets.length; i++) {
lines[offsets[i]] = i;
}
wasmStates[sourceId] = { offsets, lines };
return { lines: result.lines, done: result.done };
}
/**
* @memberof utils/wasm
* @static
*/
export function getWasmLineNumberFormatter(sourceId) {
const codeOf0 = 48,
codeOfA = 65;
const buffer = [
codeOf0,
codeOf0,
codeOf0,
codeOf0,
codeOf0,
codeOf0,
codeOf0,
codeOf0,
];
let last0 = 7;
return function (number) {
const offset = lineToWasmOffset(sourceId, number - 1);
if (offset == undefined) {
return "";
}
let i = 7;
for (let n = offset; n !== 0 && i >= 0; n >>= 4, i--) {
const nibble = n & 15;
buffer[i] = nibble < 10 ? codeOf0 + nibble : codeOfA - 10 + nibble;
}
for (let j = i; j > last0; j--) {
buffer[j] = codeOf0;
}
last0 = i;
return String.fromCharCode.apply(null, buffer);
};
}
/**
* @memberof utils/wasm
* @static
*/
export function isWasm(sourceId) {
return sourceId in wasmStates;
}
/**
* @memberof utils/wasm
* @static
*/
export function lineToWasmOffset(sourceId, number) {
const wasmState = wasmStates[sourceId];
if (!wasmState) {
return undefined;
}
let offset = wasmState.offsets[number];
while (offset === undefined && number > 0) {
offset = wasmState.offsets[--number];
}
return offset;
}
/**
* @memberof utils/wasm
* @static
*/
export function wasmOffsetToLine(sourceId, offset) {
const wasmState = wasmStates[sourceId];
if (!wasmState) {
return undefined;
}
return wasmState.lines[offset];
}
/**
* @memberof utils/wasm
* @static
*/
export function clearWasmStates() {
wasmStates = Object.create(null);
}
const wasmLines = new WeakMap();
export function renderWasmText(sourceId, content) {
if (wasmLines.has(content)) {
return wasmLines.get(content) || [];
}
// binary does not survive as Uint8Array, converting from string
const { binary } = content.value;
const data = new Uint8Array(binary.length);
for (let i = 0; i < data.length; i++) {
data[i] = binary.charCodeAt(i);
}
const { lines } = getWasmText(sourceId, data);
const MAX_LINES = 1000000;
if (lines.length > MAX_LINES) {
lines.splice(MAX_LINES, lines.length - MAX_LINES);
lines.push(";; .... text is truncated due to the size");
}
wasmLines.set(content, lines);
return lines;
}
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