Function tryKernelExtract

src/extraction/kernel/index.ts:282–316

(
  filePath: string,
  source: string,
  language: Language
)

 * only that file's speedup.
 */
export function tryKernelExtract(
  filePath: string,
  source: string,
  language: Language
): ExtractionResult | null {
  if (!kernelRoutes(language)) return null;
  const kernel = getKernel();
  if (!kernel) return null;
  if (takeDeferredPreParse(filePath, source, language) !== null) return null; // already deferred
  const t0 = Date.now();
  const pre = preParsedSource(filePath, source, language);
  try {
    const buffers = kernel.extractFile(filePath, pre, language);
    const result = decodeExtractBuffers(buffers, filePath, language);
    POST_PASSES[language]?.(result, source);
    result.durationMs = Date.now() - t0;
    return result;
  } catch (err) {
    const message = err instanceof Error ? err.message : String(err);
    // `defer:` is the kernel's expected-routing signal (files with parse
    // errors take the wasm path — its error RECOVERY is the canonical one;
    // recovery differs between UTF-8 and UTF-16 parsing). Silent by design.
    if (message.includes('defer:')) {
      deferSlot = { filePath, source, language, pre };
      return null;
    }
    if (!warned.has(language)) {
      warned.add(language);
      process.stderr.write(
        `[codegraph-kernel] ${language} extraction failed (${message}) — falling back to the wasm path\n`
      );
    }
    return null;
  }
}