mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-01 07:33:12 +08:00
Chris Tate
427e383b5e
Reapplies #2017, which #2038 reverted after effect's observability-otlp fixture crashed in plain builds. The crash was the candidate-buffer corruption that the previous commit fixes: the cached property sites change when the collector runs, and with enough environment variables a pass buffered a string box that was later pooled while still buffered.
57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
// Untyped JavaScript reading and writing properties of values it never
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// declares types for: records built by object literals in two key orders,
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// nested records, property updates, and instances of a class and its
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// subclass read and written the same way. Argument: the number of
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// iterations.
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const rounds = Number(process.argv[2] ?? "1000000");
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class Cursor {
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constructor(x, y) {
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this.x = x;
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this.y = y;
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}
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step(dx, dy) {
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this.x += dx;
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this.y += dy;
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return this;
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}
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}
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class Marker extends Cursor {
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constructor(x, y, label) {
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super(x, y);
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this.label = label;
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}
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}
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function makeItem(i) {
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if (i % 3 === 0)
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return { id: i, price: i % 17, qty: i % 5, meta: { tag: i % 7, weight: i % 11 } };
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return { id: i, qty: i % 5, price: i % 13, meta: { weight: i % 9, tag: i % 5 } };
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}
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function cost(item) {
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return item.price * item.qty + item.meta.weight;
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}
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function restock(item, round) {
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item.qty = (item.qty + round) % 7;
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item.meta.tag = (item.meta.tag + 1) % 7;
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}
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function distance(a, b) {
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return Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
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}
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const items = [];
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for (let i = 0; i < 1024; i++) items.push(makeItem(i));
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const cursors = [];
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for (let i = 0; i < 64; i++)
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cursors.push(i % 2 === 0 ? new Cursor(i - 32, 7 - i) : new Marker(i - 32, 7 - i, "m" + i));
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const origin = { x: 0, y: 0 };
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let checksum = 0;
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for (let r = 0; r < rounds; r++) {
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const item = items[r & 1023];
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checksum += cost(item);
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restock(item, r & 3);
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checksum += item.meta.tag;
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const cursor = cursors[r & 63];
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checksum += distance(cursor.step((r % 3) - 1, (r % 5) - 2), origin);
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if (cursor.x > 100 || cursor.x < -100) cursor.x = 0;
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if (cursor.y > 100 || cursor.y < -100) cursor.y = 0;
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}
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console.log(checksum, items[5].qty, items[6].meta.tag, cursors[3].x, cursors[3].y, cursors[3].label);
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