[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.0-210-gaf234c4

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- Log -----------------------------------------------------------------
commit af234c407dbab3e62994863272a63b612b0c8c63
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Nov 10 18:37:02 2009 -0800

    PR5916: Exploit kretprobe data storage area
    
    Since 2.6.25, kretprobes can carry a data packet to be filled in an
    entry_handler.  This patch lets us store our implicitly-saved $target
    variables in .return probes in that data area.
    
    * tapset/kretprobe.stp: New get/set functions for kretprobe data.
    * translate.cxx (c_unparser::emit_common_header): Add context->pi_longs.
    * tapsets.cxx
      (dwarf_var_expanding_visitor::visit_target_symbol_saved_return): Switch
      between the old and new methods of saving $vars in .return probes.
      (dwarf_var_expanding_visitor::gen_mapped_saved_return): The old way.
      (dwarf_var_expanding_visitor::gen_kretprobe_saved_return): The new way.
      (dwarf_derived_probe::join_group): Don't register paired entry-handlers.
      (dwarf_derived_probe::dwarf_derived_probe): Remember saved-var details.
      (dwarf_derived_probe_group::emit_module_decls): Output saved-var details.
      Also split the kretprobe handler whether we're on entry or return.
      (dwarf_derived_probe_group::emit_module_init): Prepare the entry handler.
    * testsuite/systemtap.base/kretprobe-vars.stp: Test implicit $var saving.

-----------------------------------------------------------------------

Summary of changes:
 tapset/kretprobe.stp                        |   56 ++++++++
 tapsets.cxx                                 |  187 +++++++++++++++++++++++----
 testsuite/systemtap.base/kretprobe-vars.exp |    4 +
 testsuite/systemtap.base/kretprobe-vars.stp |   70 ++++++++++
 translate.cxx                               |    1 +
 5 files changed, 291 insertions(+), 27 deletions(-)
 create mode 100644 tapset/kretprobe.stp
 create mode 100644 testsuite/systemtap.base/kretprobe-vars.exp
 create mode 100644 testsuite/systemtap.base/kretprobe-vars.stp


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