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--disable-cache : turn off all caching
--clean-cache : clean up stale entries and then quit
--poison-cache : force regeneration of items that would have hit the cache
These are undocumented for now, until we decide whether they are
generally useful.
* main.cxx (main): Parse the new options.
* session.h (systemtap_session): Add poison_cache; document the others.
* clean.cxx (clean_cache): No longer static.
(get_stapconf_from_cache, get_script_from_cache): Respect poison.
* tapsets.cxx (tracepoint_builder::get_tracequery_module): Ditto.
(dwarf_cast_expanding_visitor::filter_special_modules): Ditto.
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I'm separating the caching and creation logic for stapconf, so it can be
conditionalized on s.use_cache instead of s.use_script_cache.
* session.h (systemtap_session): Store base_hash for better reuse.
* hash.cxx (get_base_hash): Get the base from the session, or build it.
(find_hash): Split into separate script/stapconf versions.
* cache.cxx (add_to_cache, get_from_cache): Ditto.
* main.cxx (main): Adapt caller, and delay stapconf until pass-4.
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This makes the stapconf caching process quite a bit more transparent.
The options are now cached in a header file as #defines, and this header
file is a normal build dependency instead of calling so many make
$(shell ...) commands.
* buildrun.cxx (compile_pass): Pull in autoconf options in a header
of #defines rather than -DXXX, and make that header a build dependency.
* buildrun.cxx (output_autoconf): New function to consolidate the
computation of each autoconf test.
* cache.cxx (add_to_cache, get_from_cache, clean_cache): Start treating
the stapconf header as a first-class cached item.
* cache.h: Move definitions of things only needed in cache.cxx
* hash.cxx (find_stapconf_hash): Generate stapconf_name as a .h now.
* main.cxx (main): Default the stapconf_name based on getpid().
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* main.cxx (printscript): New function containing code moved from
main().
(main): Added code to create cache directory, call function to
generate hash, and see if we can use cached source/module. If
pass 4 is actually run to produce a new module, we call
add_to_cache() to cache the result.
* session.h (struct systemtap_session): Added hash/cache session
data.
* cache.cxx: New file handling adding/getting files from the
cache.
* cache.h: New header file for cache.cxx.
* hash.cxx: New file containing C++ wrapper for routines in
mdfour.c and the find_hash function which computes the hash file
name for an input script.
* hash.h: New header file for hash.cxx.
* mdfour.c: New file containing MD4 hash code.
* mdfour.h: New header file for mdfour.c.
* util.cxx: New file containing several utility functions used by
the caching code.
* util.h: New header file for util.cxx.
* Makefile.am: Added new C/C++ files.
* Makefile.in: Regenerated.
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