[work loop] Prevent work loop from being inlined (#16865)

Uses Closure Compiler's `@noinline` directive. See https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler#noinline
facebook · Sep 23, 2019 · a87d245 · a87d245
1 parent 312b462
commit a87d245
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -1422,13 +1422,16 @@ function inferTimeFromExpirationTimeWithSuspenseConfig(
   );
 }
 
+// The work loop is an extremely hot path. Tell Closure not to inline it.
+/** @noinline */
 function workLoopSync() {
   // Already timed out, so perform work without checking if we need to yield.
   while (workInProgress !== null) {
     workInProgress = performUnitOfWork(workInProgress);
   }
 }
 
+/** @noinline */
 function workLoop() {
   // Perform work until Scheduler asks us to yield
   while (workInProgress !== null && !shouldYield()) {