[DTrace-devel] [PATCH 0/2] Add print() action support

[Alan Maguire]

The print() action supports CTF-powered dumping of data pointed
to by the argument passed in [1].  This is a useful feature for
kernel debugging.

Changes since RFC [2]:

- Removed unneeded dtrace: from subject, removed passing test resuts,
  added doc link to [1] in patch 1 (Eugene, patches 1, 2)
- Fixed output to use the address passed in; this provides a more
  informative view saying "address 0xfeedfacefeedface is a pointer to
  struct sk_buff, here's the data".  This also resolves the issue that
  we were saving the address but not using it.  See patch 1 for output
  format (Eugene, patch 1).
- Revamped the register handling in dt_cg.c to be safer as per Eugene's
  suggestions (Eugene, patch 1)
- Fixed order of data/size and removed local vars that were unneeded
  (Eugene, patch 1)
- Fixed tests to use .d, .r for DTrace script and expected results 
  instead of stuffing it all in a .sh script (Eugene, patch 2).

[1] https://docs.oracle.com/en/operating-systems/solaris/oracle-solaris/11.4/dtrace-guide/print-action.html#GUID-533E6BD9-8DE8-474E-9770-96F84244911C
[2] https://oss.oracle.com/pipermail/dtrace-devel/2023-November/004013.html

Alan Maguire (1):
  Add support for the print() action

Eugene Loh (1):
  test: Add print() tests

 include/dtrace/actions_defines.h             |   1 +
 include/dtrace/options_defines.h             |   3 +-
 libdtrace/dt_cg.c                            |  58 ++++
 libdtrace/dt_consume.c                       | 316 +++++++++++++++++++
 libdtrace/dt_errtags.h                       |   4 +-
 libdtrace/dt_impl.h                          |   6 +-
 libdtrace/dt_open.c                          |   2 +
 libdtrace/dt_options.c                       |  25 ++
 test/unittest/print/tst.print.local.d        |  45 +++
 test/unittest/print/tst.print.local.r        |  21 ++
 test/unittest/print/tst.print.local.trunc.d  |  46 +++
 test/unittest/print/tst.print.local.trunc.r  |  12 +
 test/unittest/print/tst.print.local.zeroed.d |  46 +++
 test/unittest/print/tst.print.local.zeroed.r |   8 +
 test/unittest/print/tst.print.skb.d          |  19 ++
 test/unittest/print/tst.print.skb.r          |  14 +
 16 files changed, 622 insertions(+), 4 deletions(-)
 create mode 100644 test/unittest/print/tst.print.local.d
 create mode 100644 test/unittest/print/tst.print.local.r
 create mode 100644 test/unittest/print/tst.print.local.trunc.d
 create mode 100644 test/unittest/print/tst.print.local.trunc.r
 create mode 100644 test/unittest/print/tst.print.local.zeroed.d
 create mode 100644 test/unittest/print/tst.print.local.zeroed.r
 create mode 100644 test/unittest/print/tst.print.skb.d
 create mode 100644 test/unittest/print/tst.print.skb.r

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2.39.3