[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.8-334-g8040a4b

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- Log -----------------------------------------------------------------
commit 8040a4b42cd0fc66142d3ef2f905ea0267726b76
Merge: 098043c5f96ee58756342cfbe7b49c2572f79a15 9f9873dfc0978ef3ce7b7b5aa7ae1e2b5b4909b9
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Feb 10 20:10:33 2009 -0800

    Merge branch 'update_visitor'
    
    This brings a new update_visitor that makes it easier to traverse the
    parse tree and modify parts of it as necessary.  I wrote this as part of
    my in-progress work to allow @cast() expansion, but I was able to apply
    it to the dwarf/etc. target variable expanders and to the optimization
    stages.  I think the resulting code is more predictable and easier to
    follow...
    
    Conflicts:
    	ChangeLog (bumped my commit dates to push dates...)

commit 9f9873dfc0978ef3ce7b7b5aa7ae1e2b5b4909b9
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Feb 10 19:51:12 2009 -0800

    Simplify void_statement_reducer
    
    	* elaborate.cxx (void_statement_reducer): Convert to an update_visitor.

commit 1cd151d5b9e1fd46590d5e4c3473a86ea9bbe043
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Feb 10 18:29:55 2009 -0800

    Simplify dead_stmtexpr_remover
    
    	* staptree.h (update_visitor::require): Add a clearok parameter for
    	optimizing traversers to signal that they're ready for NULL back.
    	* elaborate.cxx (dead_stmtexpr_remover): Convert to an update_visitor.

commit 8bda649876b523f7733aa547ff86924a90f0e57b
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Feb 10 15:31:50 2009 -0800

    Simplify dead_assignment_remover
    
    By converting to an update_visitor, we now get full statement coverage
    in this optimizer for free.
    
    	* elaborate.cxx (dead_assignment_remover): Convert into an
    	update_visitor and remove its now-redundant traversal methods.

commit de68882508cf4b6e25bab9341e95b708a2bd39dc
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Feb 5 20:04:56 2009 -0800

    Expand probe variables without a deep copy
    
    * tapsets.cxx (var_expanding_copy_visitor): This struct becomes
    var_expanding_visitor and inherits from update_visitor instead of
    deep_copy_visitor.  Each of the probe-type variants of this are also no
    longer copiers.

commit 4b6455e82679becf3ad12e4f12abb70de1ee271d
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Feb 5 20:02:35 2009 -0800

    Create update_visitor for modifying trees
    
    * staptree.h (update_visitor): A new visitor to make it easier to
    rewrite parts of a probe or function without making a full copy.
    * staptree.cxx (update_visitor::*): Each child is recursed with a
    require() call, and then the parent returns itself with provide().
    * staptree.h (deep_copy_visitor): Inherit from update_visitor to get
    the recursive descent while updating nodes.
    * staptree.cxx (deep_copy_visitor::*): Use the implicit copy
    constructors to copy all fields, then defer to update_visitor for the
    recursion.  Referents are still cleared from the copies of symbols and
    function calls.

commit 4ed05b152284d9d4b8545f6e70c57ebdcd993f46
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Feb 5 13:08:44 2009 -0800

    Simplify require() and provide()
    
    * staptree.h (require, provide): Simplify stack operations with less
    pointer magic, and move to be deep_copy_visitor members.
    * staptree.h (deep_copy_visitor::deep_copy): Templatize
    * staptree.cxx, tapsets.cxx: Refactor require/provide callers

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

Summary of changes:
 ChangeLog     |   36 ++++
 elaborate.cxx |  376 +++++++++++++---------------------------
 staptree.cxx  |  547 +++++++++++++++++++++++++++++++--------------------------
 staptree.h    |  101 ++++++++---
 tapsets.cxx   |  138 +++++++--------
 5 files changed, 595 insertions(+), 603 deletions(-)


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systemtap: system-wide probe/trace tool