Sort perf-PID.map file generated by Node.js

sort-perf-map.js

const fs = require('node:fs');
const readline = require('node:readline');

const fileName = process.argv[2];
if (!fileName) {
    console.error('Please specify map file name as the first argument');
    process.exit(1);
}

function extractAddress(/*string*/line) {
    return line.substring(0, line.indexOf(' '));
}

async function sortPerfMapFile(fileName) {
    const fileStream = fs.createReadStream(fileName);
    const rl = readline.createInterface({
        input: fileStream,
        crlfDelay: Infinity
    });

    const /*string[]*/lines = [];
    for await (const line of rl) {
        if (line) {
            lines.push(line);
        }
    }

    lines.sort((s1, s2) => {
        const addr1 = extractAddress(s1);
        const addr2 = extractAddress(s2);
        if (addr1.length < addr2.length) {
            return -1;
        } else if (addr1.length === addr2.length) {
            return addr1.localeCompare(addr2);
        } else if (addr1.length > addr2.length) {
            return 1;
        }
    });

    for (const line of lines) {
        process.stdout.write(line);
        process.stdout.write('\n');
    }
}

sortPerfMapFile(fileName);