Blame for tools/prof.mjs

// usage: node prof.mjs flash.bin seconds [--syms a,b]  : prints pc histogram by function
import fs from 'fs';
import { ESP32 } from '../web/js/soc.js';
import { Syms } from './sym.mjs';
const romDir = new URL('../web/rom/', import.meta.url).pathname;
const args = process.argv.slice(2);
const flash = args[0]; const secs = parseFloat(args[1] || '2');
const symFiles = (args.find(a => a.startsWith('--syms=')) || '--syms=/tmp/opencode/hello.syms').slice(7).split(',').concat(['/tmp/opencode/rom.syms']);
const syms = new Syms(symFiles);
const soc = new ESP32({});
soc.loadRoms(fs.readFileSync(romDir + 'esp32-v3-rom.bin'), fs.readFileSync(romDir + 'esp32-v3-rom-app.bin'));
soc.setFlash(fs.readFileSync(flash)); soc.enablePsram(args.includes('--psram'));
let out = ''; soc.onUart = (n, b) => { out += String.fromCharCode(b); };
soc.reset('power');
const hist = [new Map(), new Map()];
const warm = parseFloat((args.find(a => a.startsWith('--warm=')) || '--warm=0').slice(7)) * 1e9;
const limit = secs * 1e9;
let samples = 0;
while (soc.timeNs < limit) {
  soc.run(997);
  if (soc.timeNs < warm) continue;
  for (let i = 0; i < 2; i++) { const c = soc.cpus[i]; const nm = syms.name(c.pc).replace(/\+.*/, '') + (c.halted ? '[halt]' : c.stalled ? '[stall]' : ''); hist[i].set(nm, (hist[i].get(nm) || 0) + 1); }
  samples++;
}
console.log(out.slice(-2000));
for (let i = 0; i < 2; i++) { console.log('--- cpu' + i); [...hist[i].entries()].sort((a, b) => b[1] - a[1]).slice(0, 12).forEach(([n, c]) => console.log(c, n)); }
console.log('time', soc.timeNs / 1e9);