[SCM] systemtap: system-wide probe/trace tool branch, master, updated. rhel52-ga-418-g1773fd0

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- Log -----------------------------------------------------------------
commit 1773fd0385b253ae255aa686e4f8de4764b016f4
Author: Josh Stone <joshua.i.stone@intel.com>
Date:   Wed Jun 18 19:14:15 2008 -0700

    Add Intel to copyright header on elaborate.cxx

commit 08af22351ef4f428d934d9be00a5aae33acfaf73
Author: Josh Stone <joshua.i.stone@intel.com>
Date:   Wed Jun 18 19:10:12 2008 -0700

    Add tests for new statement optimizations.
    
    	* systemtap.base/optim_voidstmt.stp: Add tests for various statement
    	optimizations that we should now be eliding.

commit 3f33ee3ac885ac639f932ab5cfec03d6f5f125d0
Author: Josh Stone <joshua.i.stone@intel.com>
Date:   Wed Jun 18 18:12:38 2008 -0700

    Hack optim_arridx to avoid more optimization than intended

commit bea72737344238d12c4b4bcd197d7e6606780e45
Author: Josh Stone <joshua.i.stone@intel.com>
Date:   Wed Jun 18 17:07:15 2008 -0700

    New optimization to break up statements in void contexts.
    
    	PR 6644
    	* elaborate.cxx (dead_stmtexpr_remover::visit_block): Flatten nested
    	block statements into a single block.
    	(dead_stmtexpr_remover::visit_if_statement): Remove the possibility
    	of if_statements with a null thenblock.  When an if lacks both then
    	and else, either remove it completely or reduce it to a simple
    	statment evaluating the condition.  With an else and no then, invert
    	the condition and else becomes then.
    	(void_statement_reducer): New optimization visitor that breaks
    	statements in void context into smaller pieces, to expose more
    	optimization opportunities.
    	(semantic_pass_opt5, semantic_pass_opt6): Bump opt5 to opt6, and
    	create a new opt5 that runs through void_statement_reducer.

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

Summary of changes:
 ChangeLog                                   |   16 +
 elaborate.cxx                               |  439 +++++++++++++++++++++++++--
 testsuite/ChangeLog                         |    5 +
 testsuite/systemtap.base/optim_arridx.exp   |    2 +-
 testsuite/systemtap.base/optim_arridx.stp   |    2 +-
 testsuite/systemtap.base/optim_voidstmt.exp |    5 +
 testsuite/systemtap.base/optim_voidstmt.stp |   95 ++++++
 7 files changed, 543 insertions(+), 21 deletions(-)
 create mode 100644 testsuite/systemtap.base/optim_voidstmt.exp
 create mode 100644 testsuite/systemtap.base/optim_voidstmt.stp


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