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LibJS: Eliminate GeneratorResult GC cell allocation on yield/await

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Store yield_continuation and yield_is_await directly in
ExecutionContext instead of allocating a GeneratorResult GC cell.
This removes a heap allocation per yield/await and fixes a latent
bug where continuation addresses stored as doubles could lose
precision.
This commit is contained in:
Johan Dahlin
2026-03-16 00:02:11 +01:00
committed by Andreas Kling
parent 9a34fb59aa
commit 1179e40d3f
Notes: github-actions[bot] 2026-03-20 20:58:50 +00:00 
Author: https://github.com/jdahlin
Commit: https://github.com/LadybirdBrowser/ladybird/commit/1179e40d3f4
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8457
Reviewed-by: https://github.com/awesomekling
14 changed files with 90 additions and 176 deletions
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4
Libraries/LibJS/Runtime/NativeJavaScriptBackedFunction.cpp
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@@ -80,9 +80,9 @@ ThrowCompletionOr<Value> NativeJavaScriptBackedFunction::call()
auto& realm = *vm.current_realm();
if (kind == FunctionKind::AsyncGenerator)
return AsyncGenerator::create(realm, result, GC::Ref { *this }, vm.running_execution_context().copy());
return AsyncGenerator::create(realm, GC::Ref { *this }, vm.running_execution_context().copy());
auto generator_object = GeneratorObject::create(realm, result, GC::Ref { *this }, vm.running_execution_context().copy());
auto generator_object = GeneratorObject::create(realm, GC::Ref { *this }, vm.running_execution_context().copy());
// NOTE: Async functions are entirely transformed to generator functions, and wrapped in a custom driver that returns a promise.
if (kind == FunctionKind::Async)