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LibJS: Let invokers (callers) of [[Call]] allocate ExecutionContext

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Instead of letting every [[Call]] implementation allocate an
ExecutionContext, we now make that a responsibility of the caller.

The main point of this exercise is to allow the Call instruction
to write function arguments directly into the callee ExecutionContext
instead of copying them later.

This makes function calls significantly faster:
- 10-20% faster on micro-benchmarks (depending on argument count)
- 4% speedup on Kraken
- 2% speedup on Octane
- 5% speedup on JetStream
This commit is contained in:
Andreas Kling
2025-04-27 11:53:11 +02:00
committed by Andreas Kling
parent 93788f8057
commit a05be67e4a
Notes: github-actions[bot] 2025-04-27 23:24:56 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/a05be67e4ae
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4497
Reviewed-by: https://github.com/Hendiadyoin1
18 changed files with 139 additions and 84 deletions
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3
Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h
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@@ -116,7 +116,8 @@ public:
virtual void initialize(Realm&) override;
virtual ~ECMAScriptFunctionObject() override = default;
virtual ThrowCompletionOr<Value> internal_call(Value this_argument, ReadonlySpan<Value> arguments_list) override;
virtual ThrowCompletionOr<void> get_stack_frame_size(size_t& registers_and_constants_and_locals_slots, size_t& argument_count) override;
virtual ThrowCompletionOr<Value> internal_call(ExecutionContext&, Value this_argument) override;
virtual ThrowCompletionOr<GC::Ref<Object>> internal_construct(ReadonlySpan<Value> arguments_list, FunctionObject& new_target) override;
void make_method(Object& home_object);