mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-27 06:43:19 +08:00
Chris Tate
7cce36354f
A method call on a value of unknown type (untyped JavaScript, `any`) picked its builtin by comparing the method name with strcmp against each candidate, in long ladders per receiver kind: a string method could test dozens of names before it matched. - The name is now looked up once per call in a generated hash table (scr_dyn_methods.h, from scripts/gen-dyn-methods.mjs), and each ladder compares the resulting id. The table verifies the name's bytes, so a name is matched by its content, as before. - The worker event methods compare the first character before strcmp. - bench/dynamic-methods calls string, array, Map, Set, number and own methods from untyped JavaScript.
37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
// Untyped JavaScript calling builtin methods on values it never declares
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// types for: string slice/indexOf/toUpperCase/startsWith/padStart, array
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// push/pop/at/join/includes/indexOf, Map and Set get/set/has/add, number
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// toFixed, and calls of an object's own methods. Argument: the number of
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// iterations.
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const rounds = Number(process.argv[2] ?? "300000");
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const words = ["alpha", "beta", "gamma", "delta", "epsilon", "zeta", "eta", "theta"];
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const counts = new Map();
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const seen = new Set();
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const stack = [];
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const recent = [];
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const tally = {
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total: 0,
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add(value) {
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this.total += value;
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return this.total;
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},
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};
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let checksum = 0;
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for (let i = 0; i < rounds; i++) {
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const word = words[i % words.length];
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const head = word.slice(0, 3).toUpperCase();
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const key = head.padStart(4, "-");
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if (word.indexOf("e") >= 0 && !word.startsWith("z")) checksum += 1;
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counts.set(key, (counts.get(key) ?? 0) + 1);
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seen.add(i % 97);
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if (seen.has(i % 89)) checksum += 2;
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stack.push(i);
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if (stack.length > 32) checksum += stack.pop() % 3;
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recent.push(word);
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if (recent.length > 4) recent.shift();
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if (recent.includes("gamma")) checksum += recent.indexOf("gamma");
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checksum += tally.add(i % 5) % 11;
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if (i % 1000 === 0) checksum += Number((i / 7).toFixed(2)) | 0;
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}
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console.log(checksum, counts.size, seen.size, stack.at(-1), recent.join(","), tally.total);
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