Maksim Panchenko 105ecd8bb2
[BOLT] Avoid EH trampolines for PIEs/DSOs (#117106)
We used to emit EH trampolines for PIE/DSO whenever a function fragment
contained a landing pad outside of it. However, it is common to have all
landing pads in a cold fragment even when their throwers are in a hot
one.

To reduce the number of trampolines, analyze landing pads for any given
function fragment, and if they all belong to the same (possibly
different) fragment, designate that fragment as a landing pad fragment
for the "thrower" fragment. Later, emit landing pad fragment symbol as
an LPStart for the thrower LSDA.
2024-11-21 18:18:30 -08:00
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