tree b892125899cc52a2d420435003896fd6680e933f
parent ef92aba52a58cda8d670de8ce936455949746468
author Peter Smith <peter.smith@arm.com> 1731694698 +0000
committer GitHub <noreply@github.com> 1731694698 +0000
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[LLD][AArch64] Detach Landing Pad creation from Thunk creation (#116402)

Move Landing Pad Creation to a new function that checks each thunk every
pass to see if it needs a landing pad. This permits a thunk to be
created without needing a landing pad, but later needing one due to
drifting out of direct branch range and requiring an indirect branch.

We record all the Thunks created so far in a new vector rather than
trying to iterate over the DenseMap as we need a deterministic order of
adding LandingPadThunks due to the short branch fall through. We cannot
use normalizeExistingThunk() either as that only iterates through live
thunks.

Fixes: https://crbug.com/377438309
Original PR: https://github.com/llvm/llvm-project/pull/108989

Sending without a new test case to fix existing test. A new regression
test will come in a separate PR as coming up with a small enough
reproducer for this case is non-trivial.