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Malte UblandClaude Opus 5.5
83517ecd82
A for-of over a tuple producer's result only reads its elements, so the tuple now lives in frame storage and the producer runs through its result-slot entry. The test still checks that the receiver is computed once and that no array snapshot is allocated, whichever entry runs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
39 lines
1.5 KiB
TypeScript
39 lines
1.5 KiB
TypeScript
import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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import { expect, test } from "vitest";
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import { compile, deserializeModule, validateModule } from "../src/index.js";
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import { emitLlvmModule } from "../src/backend/llvm/emitter.js";
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test("tuple iteration retains one computed receiver without allocating an array snapshot", async () => {
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const dir = await mkdtemp(join(tmpdir(), "scriptc-tuple-forof-"));
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try {
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const entry = join(dir, "main.ts");
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const outPath = join(dir, "main.ir.json");
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await writeFile(
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entry,
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`
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let calls = 0;
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function pair(): [number, number] { calls++; return [2, 3]; }
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let total = 0;
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for (const n of pair()) total += n;
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console.log(total, calls);
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`,
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);
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const result = await compile(entry, { outDir: dir, outPath, outputKind: "ir" });
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if (!result.ok) throw new Error(result.diagnostics.map((d) => d.message).join("\n"));
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const mod = deserializeModule(await readFile(outPath, "utf8"));
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expect(validateModule(mod)).toEqual([]);
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const llvm = emitLlvmModule(mod);
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// The receiver is computed once: an ordinary call, or (when the loop
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// only reads elements) the result-slot entry filling frame storage.
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const calls =
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(llvm.match(/call ptr @sc_f_pair\(/g) ?? []).length +
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(llvm.match(/call void @sc_\w*into_pair\(ptr %s\d+\)/g) ?? []).length;
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expect(calls).toBe(1);
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expect(llvm).not.toContain("@scr_arr_new");
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} finally {
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await rm(dir, { recursive: true, force: true });
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}
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});
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