[PATCH 0/3] libdw: Tweaks for optimization and clarity

Josh Stone jistone at redhat.com
Thu Dec 11 02:48:02 UTC 2014


While looking at performance for Mark's form-len patch, I found a few areas
that I felt could be cleaned up a bit.

1. die->abbrev initialization was duplicated in a few places.
2. dwarf_hasattr needn't look at the die at all, just abbrev.
3. CU start/end boundaries don't need to be computed from section data
   every time -- just remember them in Dwarf_CU.

These patches get me back down to about 71s for "varlocs -k >/dev/null". :)
---
 libdw/ChangeLog           | 19 +++++++++++++++++++
 libdw/dwarf_child.c       | 47 ++++++++++++++++++-----------------------------
 libdw/dwarf_cuoffset.c    |  4 ++--
 libdw/dwarf_dieoffset.c   |  4 ++--
 libdw/dwarf_getattrs.c    | 21 ++++++++-------------
 libdw/dwarf_hasattr.c     | 42 ++++++++++++++++++++++++++++++++++++++----
 libdw/dwarf_haschildren.c | 20 ++++----------------
 libdw/dwarf_siblingof.c   |  6 ++----
 libdw/dwarf_tag.c         | 20 +++++---------------
 libdw/libdwP.h            | 28 +++++++++++++++++++++++++++-
 libdw/libdw_findcu.c      |  6 +++++-
 11 files changed, 130 insertions(+), 87 deletions(-)



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