JohnReagan added a comment.
Does the current code generate all the prologue cfi directives?
Epilogue too? The last time I checked, it did not (especially for
epilogues).
Fully asynch prologue/epilogue is one of the things that we need for
OpenVMS and will be doing that work. We're also
Does the current code generate all the prologue cfi directives?
Epilogue too? The last time I checked, it did not (especially for
epilogues).
Fully asynch prologue/epilogue is one of the things that we need for
OpenVMS and will be doing that work. We're also looking at using the
compact format
That said, prior art in gcc in this area:
-fasynchronous-unwind-tables
Generate unwind table in DWARF format, if supported by target machine.
The table is exact at each instruction boundary, so it can be used for
stack unwinding from asynchronous events (such as debugger or garbage
collector).
keith.walker.arm added a comment.
I feel that using a -g option make more sense.
Maybe -gdwarf-frame, or -gdwarf-frame-always might be more user friendly as it
relates more to the DWARF section created rather than the section content.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST
dcandler added a comment.
Herald added a subscriber: ychen.
I was actually torn myself on whether to put the flag in the g group or not, so
I'm happy to rename it. As far as I could find, no compiler has an existing
option to control this: instead armcc always includes a debug_frame section by
ostannard requested changes to this revision.
ostannard added a comment.
This revision now requires changes to proceed.
Does the name of the `-falways-need-cfi` option match any existing compiler
(google doesn't find anything)? If not, I think it would make more sense as a
`-g` option, as it's
dcandler created this revision.
dcandler added reviewers: echristo, probinson, aprantl.
Herald added subscribers: llvm-commits, cfe-commits, hiraditya, kristof.beyls,
javed.absar.
Herald added projects: clang, LLVM.
This adds a flag to LLVM and clang to always generate call frame information,
