LibJS: Avoid redundant ExecutionContext allocation for bound functions

Instead of creating a second ExecutionContext in BoundFunction.[[Call]], we now implement BoundFunction::get_stack_frame_size() and combine information from the target + the bound arguments list. This allows BoundFunction.[[Call]] to reuse the already-established ExecutionContext for the callee. 1.20x speedup on MicroBench/bound-call-04-args.js
Author: https://github.com/awesomekling Commit: 74f133293d Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4627
2025-07-28 11:49:44 +00:00 · 2025-05-06 19:55:11 +02:00 · 2025-05-06 19:55:11 +02:00 · 74f133293d · 2025-05-07 11:21:37 +00:00
commit 74f133293d
parent dbece92637
3 changed files with 31 additions and 13 deletions
--- a/Libraries/LibJS/Tests/regress/function-bind-arguments.js
+++ b/Libraries/LibJS/Tests/regress/function-bind-arguments.js
@ -0,0 +1,17 @@
+test("Some function.bind cases", () => {
+    function collectArguments() {
+        let a = [];
+        for (let i = 0; i < arguments.length; ++i) a.push(arguments[i]);
+        return a;
+    }
+
+    let b = collectArguments.bind(null);
+    expect(b()).toEqual([]);
+    expect(b(3, 4)).toEqual([3, 4]);
+    expect(b(3, 4, 5, 6)).toEqual([3, 4, 5, 6]);
+
+    let b12 = collectArguments.bind(null, 1, 2);
+    expect(b12()).toEqual([1, 2]);
+    expect(b12(3, 4)).toEqual([1, 2, 3, 4]);
+    expect(b12(3, 4, 5, 6)).toEqual([1, 2, 3, 4, 5, 6]);
+});