https://bugs.llvm.org/show_bug.cgi?id=49780
Bug ID: 49780
Summary: Should synthetic sections be InputSections or
OutputSections?
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: MachO
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
We decided to make SyntheticSections be OutputSections back in
https://reviews.llvm.org/D77893#inline-716459. We were debating why ELF makes
them InputSections; it appears the main motivation for that design was to allow
synthetic sections to be manipulated via linker scripts, which we don't need to
support with Mach-O.
Peter Smith gave a talk on LLD's performace
(https://archive.fosdem.org/2019/schedule/event/llvm_lld/), in which he
mentioned that LLD's synthetic sections being input sections (as opposed to
output sections) significantly sped up thunks (at the 25:10 mark). Our thunk
design will likely be closer to COFF's than ELF's, so I'd be curios if this has
an effect for us.
We discussed this further in https://reviews.llvm.org/D87199#2264781, where we
decided to defer any potential refactoring until we were more feature-complete.
I don't think we're still at the point where we'd consider this refactoring
yet, but it's worth keeping in mind for the future.
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