drgn 0.0.15
New features:
- `Symbol.binding` and `Symbol.kind` were added to provide more information about symbols (e.g., whether a symbol is global or local, whether it refers to a function or variable).
- `Program.symbol(name)` now falls back to returning a local symbol if a matching global symbol was not found.
- Helpers for looking up network namespaces were added (`drgn.helpers.linux.net.for_each_net()` and `drgn.helpers.linux.net.get_ns_by_{inode,fd}()`).
- More networking helpers were added (`drgn.helpers.linux.net.netdev_for_each_tx_queue()` and `drgn.helpers.linux.tc.qdisc_lookup()`).
- Partial support for alternate DWARF files (`.gnu_debugaltlink`) was added. These are created by DWZ and used by Linux distros in some debugging symbol packages. Types and objects from the alternate file can not yet be looked up by name.
Bug fixes:
- A workaround was added for a bug in elfutils 0.183-0.185 that causes crashes when targeting userspace core dumps.
- Reading memory from a core dump was fixed to return a fault error instead of zeros for regions that were not saved in the core dump.
- Type name formatting was fixed to not include the entire definition of anonymous types.
- Parsing of DWARF representing an enum type which is backed by a typedef was fixed (now the underlying type is used).
- ELF core dump note matching was fixed to use an exact name match instead of a prefix match.
- Support for variable locations in DWARF 3 files was fixed.
- Support for structure member locations in DWARF 2 files was fixed.
- A memory leak when targeting a makedumpfile compressed kernel core dump was fixed.
- Indexing debugging symbols for a C++ namespace was fixed to be parallelized as intended.
- Incorrect memory allocation error checks were fixed for a couple of hash table insertions.
- Incorrect cleanup after failing to index DWARF information was fixed.
- An incorrect error when failing to get the build ID of an ELF file was fixed.
- A dropped error when applying ELF relocations was fixed.
- A missing error check in the C implementation of `drgn.helpers.linux.pid.pid_task()` was added.
- A missing error check when parsing C type names was fixed.
- An incorrect error return when memory allocation failed while parsing an array type from DWARF was fixed.
Other improvements:
- Memory usage after loading debugging symbols was decreased (by more aggressively freeing unneeded memory and by lazily allocating memory for C++ namespaces).
- Stack trace variable resolution in inline functions was optimized (by optimizing how we look up the context of an inline function).
- Type and object lookups were optimized (by avoiding OpenMP overhead after the DWARF information was already indexed).
- Installation documentation was improved.
- Documentation for getting debugging symbols was added.
- Linux 5.15 and 5.16 were tested and did not require any changes.
Internal:
- Debugging information handling was reorganized to prepare for upcoming changes.
- Tests were added for the cgroup helpers.
- [Packit](https://packit.dev/) configuration was added.