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CI testing:
- support for github CI tests to build pahole with gcc
and LLVM.
- support for github CI tests to build pahole, a kernel
along with BTF using that pahole and run tests.
- tests can also be run standalone; see toplevel README
for details.
DWARF loader:
- better detection of abort during thread processing.
BTF encoder:
- pahole now uses an improved scheme to detect presence of
newer libbpf functions for cases where pahole is built with
a non-embedded libbpf. A local weak declaration is added,
and if the function is non-NULL - indicating it is present -
the associated feature is avaialble. BTF feature detection
makes use of this now and BTF features declared in pahole
can provide a feature check function.
- Type tags are now emitted for bpf_arena pointers if the
attributes btf_feature is specified.
- kfunc tagging has been refactored into btf_encoder__collect_kfuncs
to simplify from the previous two-stage collect/tag process.
- To support global variables other than per-CPU variables, code
was added to match a variable with the relevant section. However
variables in to-be-discarded sections have address value 0 and
appeared to be in the per-CPU section (since it starts at 0).
Add checks to ensure the variable really is in the relevant
ELF section.
- To avoid expensive variable address checking in the above case,
filter out variables prefixed by __gendwarfksyms_ptr_ which are
present when CONFIG_GENDWARFKSYMS is set.
- Memory access bugs reported by address sanitizer were also fixed.
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