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CINT C++ Interpreter update

CINT C++ Interpreter update. ROOT2001 at Fermi-Lab Masaharu Goto. Agenda. About CINT Progress since ROOT2000 Major Progresses Issues Plans. About CINT. CINT is a C/C++ Interpreter Compiled C/C++ library can be dynamically linked Platform independent (almost all major OS, MPU)

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CINT C++ Interpreter update

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  1. CINT C++ Interpreterupdate ROOT2001 at Fermi-Lab Masaharu Goto

  2. Agenda • About CINT • Progress since ROOT2000 • Major Progresses • Issues • Plans

  3. About CINT • CINT is a C/C++ Interpreter • Compiled C/C++ library can be dynamically linked • Platform independent (almost all major OS, MPU) • Not perfect, but covers 95%/85% of C/C++ syntax • Since 1996, CINT is used as a macro interpreter and dictionary generator in ROOT framework • Many users world wide

  4. Progress since ROOT2000 • Weekly release • Released every weekend • Revision 5.14.32-90 , 5.15.02 • Many bug fixes and enhancements • Mods serial number : 1276 to 1538 • In case of side-effects, new features can be turned off by defining G__OLDIMPLEMENTATION[ModsNum] in G__ci.h

  5. Major Progresses • New revision number policy and DLL compatibility • Multi-threading (experimental) • New memory allocation system • Variable arguments in interpreted code and x86 architecture • Stub class/function

  6. New revision number policy • Cint revision number will be synchronized with DLL binary compatibility • Benefit • Easy to figure out DLL binary compatibility • (Cint table size became independent from DLL binary compatibility) 5 . 15 . 02 Patch level: changed every release Minor version: changed when DLL has to be recompiled Major version: changed at major architecture change

  7. New revision number policy (2) • In most cases, DLL created by an older minor version can be loaded by newer minor version. But, the other way around is not possible. • DLL created by 5.15.xx could be loaded by 5.16.xx, but not always. If not possible, it is rejected by DLL revision checking mechanism. • DLL created by 5.16.xx will not be loaded by 5.15.xx.

  8. Multi Threading (Experimental) • “True” multi-thread interpretation using a very smart trick proposed by Christoph Bugel and his colleague in TTI-telecom • Copy libcint.so/dll, load them separately and run in multiple threads • Works best on Windows • RedHat6.2 Linux is also supported, but with limitation. • Need special configuration • Refer to $CINTSYSDIR/demo/multilibcint/README.txt

  9. Multi Threading (2) • Can not apply this technique on ROOT/CINT • Problem in Use-Model and platform dependency • Problem in Linux dynamic loader symbol resolution • ROOT static object ? • At this moment, other technique work better • More investigation is needed

  10. Issues • Precompiled STL container in ROOT environment • Problem associated with memory allocation system • Frequent bug reports on following items • Bytecode optimization (Try ‘.O0’ - ‘.O3’ if you have problem) • ‘#pragma link’ statement • RedHat7.0 Linux and Windows2000 support • Minor improvement may be needed • Undetermined multi-thread execution model • Use-Case and OS limitation

  11. Plans • Precompiled STL container in ROOT environment • Find solution during ROOT2001 • Multi-thread investigation • Continue support

  12. Your Bug Report is appreciated • Report bug reports to rootdev@pcroot.cern.ch • roottalk may be overlooked • Please report CINT revision number too • If it is a degrade from previous version, what is the last revision that worked fine. • Your simplified example is very helpful • Thank you very much

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