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https://github.com/vercel-labs/scriptc.git
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Malte Ubl
fc89fec9b9
A virtual call whose receivers can only be a few known classes (every class that may be instantiated below the static class resolves the method to one of at most four declarations) now records that closed set on the virtualCall node. The backend compares the loaded vtable slot against each implementation but the last and calls the match directly, so LLVM can inline the bodies and keep loop-carried values in registers. Open subtrees (decorators, dynamic bases, exported library classes, runtime classes) and larger sets keep the indirect call.
23 lines
660 B
TypeScript
23 lines
660 B
TypeScript
// Closed class hierarchies declared in another module dispatch like local
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// ones, and an exported counter stays visible to the importer.
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import { Animal, Bird, Dog, calls, chorus } from "./shapes.ts";
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class Cat extends Animal {
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sound(): string {
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return "meow";
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}
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}
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const zoo: Animal[] = [];
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for (let i = 0; i < 9; i++) {
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if (i % 3 === 0) zoo.push(new Dog(i));
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else if (i % 3 === 1) zoo.push(new Bird(i));
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else zoo.push(new Cat(i));
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}
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let legs = 0;
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for (let round = 0; round < 4; round++) for (const a of zoo) legs += a.legs();
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console.log(chorus(zoo));
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console.log("legs", legs, "calls", calls);
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console.log(chorus(zoo.slice(3, 6)), calls);
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