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This commit makes some structural changes to the CTF/BTF debug info
emission. In particular:
a) CTF is new always fully generated and emitted before any
BTF-related procedures are run. This means that BTF-related
functions can change, even irreversibly, the shared in-memory
representation used by the two formats without issue.
b) BTF generation has fewer entry points, and is cleanly divided
into early_finish and finish.
c) BTF is now always emitted at finish (called from dwarf2out_finish),
for all targets in non-LTO builds, rather than being emitted at
early_finish for targets other than BPF CO-RE. In LTO builds,
BTF is emitted at early_finish as before.
Note that this change alone does not alter the contents of BTF at
all, regardless of whether it would have previously been emitted at
early_finish or finish, because the calculation of the BTF to be
emitted is not moved by this patch, only the write-out.
The changes are transparent to both CTF and BTF emission.
gcc/
* btfout.cc (btf_init_postprocess): Rename to...
(btf_early_finish): ...this.
(btf_output): Rename to...
(btf_finish): ...this.
* ctfc.h: Analogous changes.
* dwarf2ctf.cc (ctf_debug_early_finish): Conditionally call
btf_early_finish, or ctf_finalize as appropriate. Emit BTF
here for LTO builds.
(ctf_debug_finish): Always call btf_finish here if generating
BTF info in non-LTO builds.
(ctf_debug_finalize, ctf_debug_init_postprocess): Delete.
* dwarf2out.cc (dwarf2out_early_finish): Remove call to
ctf_debug_init_postprocess.
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