wasmux/wasmux/arch/core/src/syscall-nums.h.mjs

WebAssembly toolchain for compiling libc and kernel into system-level WASM modules

import fs from "node:fs";
import path from "node:path";
import url from "node:url";

import bitmake from "bitmake";
const { cxx } = bitmake;

export default async function(mk) {
  const scriptUrl = url.pathToFileURL(mk.SCRIPT_INPUT.toString());
  const syscalls = (await import(scriptUrl)).default;

  const lines = [];
  const pragmaOnce = cxx.filenameToPragmaOnceMacro(mk.SCRIPT_OUTPUT.toString());

  lines.push(cxx.generatedScriptNameComment(import.meta.url));
  lines.push(`#ifndef ${pragmaOnce}`);
  lines.push(`#define ${pragmaOnce}`);
  lines.push(``);

  let maxNumber = 0;
  for (const [ name, { number }] of Object.entries(syscalls)) {
    lines.push(`#define __NR_${name} ${number}`);
    maxNumber = Math.max(maxNumber, number);
  }

  lines.push(``);
  lines.push(`#ifdef __KERNEL__`);
  lines.push(`#define __NR_syscalls ${maxNumber + 1}`);
  lines.push(`#endif`);
  lines.push(``);
  lines.push(`#endif /* ${pragmaOnce} */`);

  fs.mkdirSync(path.dirname(mk.SCRIPT_OUTPUT.toString()), { recursive: true });
  fs.writeFileSync(mk.SCRIPT_OUTPUT.toString(), lines.join('\n'), "utf8");
}