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LibWeb/HTML: Assert microtasks invoked on empty execution context stack

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This a requirement from the ECMA-262 spec.
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Shannon Booth 2025-01-03 12:10:53 +13:00 • committed by Andreas Kling
commit 34b8a9ab75
Notes: github-actions[bot] 2025-01-03 10:00:13 +00:00
1 changed files with 4 additions and 0 deletions
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4
Libraries/LibWeb/HTML/EventLoop/EventLoop.cpp
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@ -473,6 +473,10 @@ void perform_a_microtask_checkpoint()
// https://html.spec.whatwg.org/#perform-a-microtask-checkpoint // https://html.spec.whatwg.org/#perform-a-microtask-checkpoint
void EventLoop::perform_a_microtask_checkpoint() void EventLoop::perform_a_microtask_checkpoint()
{ {
// NOTE: This assertion is per requirement 9.5 of the ECMA-262 spec, see: https://tc39.es/ecma262/#sec-jobs
// > At some future point in time, when there is no running context in the agent for which the job is scheduled and that agent's execution context stack is empty...
VERIFY(vm().execution_context_stack().is_empty());
// 1. If the event loop's performing a microtask checkpoint is true, then return. // 1. If the event loop's performing a microtask checkpoint is true, then return.
if (m_performing_a_microtask_checkpoint) if (m_performing_a_microtask_checkpoint)
return; return;