tree a8daa54e7b2aaebe323ca0d9ff287291483dafa2
parent 705e27c23474f3177670a791b5b54eefedee0cd8
author Jeremy Morse <jeremy.morse@sony.com> 1747772816 +0100
committer GitHub <noreply@github.com> 1747772816 +0100
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[MC][DebugInfo] Emit linetable entries with known offsets immediately (#134677)

DWARF linetable entries are usually emitted as a sequence of
MCDwarfLineAddrFragment fragments containing the line-number difference
and an MCExpr describing the instruction-range the linetable entry
covers. These then get relaxed during assembly emission.

However, a large number of these instruction-range expressions are
ranges within a fixed MCDataFragment, i.e. a range over fixed-size
instructions that are not subject to relaxation at a later stage. Thus,
we can compute the address-delta immediately, and not spend time and
memory describing that computation so it can be deferred.