It's not easy to get the names of functions that has namespaces / class names that are taking a lot of character space (e.g. due to generic parameters)

[julienw]

example: https://profiler.firefox.com/public/2472k1k8y08jzryrcj1f60jsntaae0br7dax5ag/flame-graph/?globalTrackOrder=0w3&thread=3&v=10

function name: style::invalidation::element::invalidator::TreeStyleInvalidator::invalidate_child
function name with all types: style::invalidation::element::invalidator::TreeStyleInvalidator<style::gecko::wrapper::GeckoElement,style::invalidation::element::relative_selector::RelativeSelectorOuterInvalidationProcessor<style::gecko::wrapper::GeckoElement> >::invalidate_child<style::gecko::wrapper::GeckoElement,style::invalidation::element::relative_selector::RelativeSelectorOuterInvalidationProcessor<style::gecko::wrapper::GeckoElement> >(style::gecko::wrapper::GeckoElement, ref$<slice2$<style::invalidation::element::invalidator::Invalidation> >, smallvec::SmallVec<array$<style::invalidation::element::invalidator::Invalidation,10> >*, style::invalidation::element::invalidator::DescendantInvalidationKind) [servo/components/style/invalidation/element/invalidator.rs]

The only way I found to get the name for this function was to copy the function name from the context menu, and paste it elsewhere.

The problem is everywhere: call tree, flame graph, stack chart, tooltip.. but not the sidebar. Maybe a quick win would be to display just the function name in the tooltip. Possibly the opposite is better: display just the function name in the flame graph and stack chart, but the full name (non ellipsis-ed) in the tooltip.

Other ideas:
We should probably reduce the length of some generics. Ideas: remove the module name, replace the generics by ... after some depth. What are other tools doing?

┆Issue is synchronized with this Jira Task

[mstange]

One way to rephrase that particular function would be:

style::invalidation::element::invalidator::TreeStyleInvalidator<A,B>::invalidate_child<A,B>(A, ref$<C>, smallvec::SmallVec<D>*, style::invalidation::element::invalidator::DescendantInvalidationKind) with A = style::gecko::wrapper::GeckoElement, B = style::invalidation::element::relative_selector::RelativeSelectorOuterInvalidationProcessor<A>, C = slice2$<E>, D = array$<E,10>, E = style::invalidation::element::invalidator::Invalidation

This issue has previously come up in #1468 - that particular issue was fixed by excluding return types from the symbol names. But we have the same issue for "scope names" / "class names" with generic parameters.

[julienw]

style::invalidation::element::invalidator::TreeStyleInvalidator<A,B>:: is still pretty long as a prefix; I wonder if we should remove that (or part of that) for the text to show in the graphs' boxes.