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LibJS: Store bytecode VM program counter in ExecutionContext

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This way it's always automatically correct, and we don't have to
manually flush it in push_execution_context().

~7% speedup on the MicroBench/call* tests :^)
This commit is contained in:
Andreas Kling 2025-04-28 19:02:56 +02:00 • committed by Jelle Raaijmakers
commit 4d17707b26
Notes: github-actions[bot] 2025-04-28 19:13:46 +00:00
6 changed files with 22 additions and 33 deletions
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15
Libraries/LibJS/Runtime/VM.h
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@ -115,12 +115,21 @@ public:
if (did_reach_stack_space_limit()) [[unlikely]] {
return throw_completion<InternalError>(ErrorType::CallStackSizeExceeded);
}
push_execution_context(context);
m_execution_context_stack.append(&context);
return {};
}
void push_execution_context(ExecutionContext&);
void pop_execution_context();
void push_execution_context(ExecutionContext& context)
{
m_execution_context_stack.append(&context);
}
void pop_execution_context()
{
m_execution_context_stack.take_last();
if (m_execution_context_stack.is_empty() && on_call_stack_emptied)
on_call_stack_emptied();
}
// https://tc39.es/ecma262/#running-execution-context
// At any point in time, there is at most one execution context per agent that is actually executing code.