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LibJS: Add a charAt builtin bytecode fast path

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Tag String.prototype.charAt as a builtin and emit a dedicated
bytecode instruction for non-computed calls.

The asm interpreter can then stay on the fast path when the
receiver is a primitive string with resident UTF-16 data and the
selected code unit is ASCII. In that case we can return the VM's
cached empty or single-character ASCII string directly.
This commit is contained in:
Andreas Kling
2026-04-12 14:11:55 +02:00
committed by Andreas Kling
parent d31750a43c
commit 7bc40bd54a
Notes: github-actions[bot] 2026-04-12 17:16:55 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/7bc40bd54a2
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8879
10 changed files with 85 additions and 2 deletions
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Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -2967,6 +2967,7 @@ JS_DEFINE_GENERIC_BUILTIN_CALL_EXECUTE_IMPL(MapIteratorPrototypeNext)
JS_DEFINE_GENERIC_BUILTIN_CALL_EXECUTE_IMPL(SetIteratorPrototypeNext)
JS_DEFINE_GENERIC_BUILTIN_CALL_EXECUTE_IMPL(StringIteratorPrototypeNext)
JS_DEFINE_UNARY_GENERIC_BUILTIN_CALL_EXECUTE_IMPL(StringPrototypeCharCodeAt)
JS_DEFINE_UNARY_GENERIC_BUILTIN_CALL_EXECUTE_IMPL(StringPrototypeCharAt)
#undef JS_DEFINE_BINARY_GENERIC_BUILTIN_CALL_EXECUTE_IMPL
#undef JS_DEFINE_UNARY_GENERIC_BUILTIN_CALL_EXECUTE_IMPL