49 lines
1.1 KiB
JavaScript
49 lines
1.1 KiB
JavaScript
const INTERVAL_MS = 1;
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const RS_TOP_ADDR = 0x10000;
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const PROF_DATA_ADDR = 0x58;
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const PROF_DATA_IDX = PROF_DATA_ADDR / 8;
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let mem_8;
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let mem_64;
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let sampler;
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const samples = [];
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function sample() {
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const data = Atomics.load(mem_64, PROF_DATA_IDX);
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const ip = Number(data & 0xffffffffn);
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const rsp = Number(data >> 32n);
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samples.push({ ip, rs_bytes: mem_8.slice(rsp, RS_TOP_ADDR) });
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}
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function i32(bytes) {
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return bytes[0]
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| (bytes[1] << 8)
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| (bytes[2] << 16)
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| (bytes[3] << 24);
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}
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function postproc({ ip, rs_bytes }) {
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const rs = [];
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for (let i = 0; i < rs_bytes.length; i += 4)
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rs.push(i32(rs_bytes.slice(i, i + 4)));
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rs.reverse();
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return { ip, rs };
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}
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self.onmessage = (e) => {
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switch (e.data.type) {
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case "start":
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console.log("Starting profiler");
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mem_8 = new Uint8Array(e.data.mem.buffer);
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mem_64 = new BigUint64Array(e.data.mem.buffer);
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ip = e.data.ip;
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rsp = e.data.rsp;
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sampler = setInterval(sample, INTERVAL_MS);
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break;
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case "stop":
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clearInterval(sample);
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console.log("Stopped profiler");
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self.postMessage(samples.map(postproc));
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}
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};
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