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Copyright (C) 2012 Łukasz Czerwiński

StructCompacter

StructCompacter reads object (*.o) file in ELF format and using DWARF debug info section detects structs and theirs members, calculates padding and tries such shuffle with members to minimalize padding space and save memory.

Website

https://github.com/wo3kie/structCompacter

Requirements

pyelftool library (https://bitbucket.org/eliben/pyelftools)

How to run it?

>python bin\sc.py priv\library.o
Reading DWARF (may take some time)...
Fixing types...
Finding paddings...
Compacting structs...
... and finally:
Files Mutex.old.64.sc Mutex.new.56.sc created
Done.
  
>vim -d Mutex.old.64.sc Mutex.new.56.sc
__inheritance  (+0)[d{LockableBase} (8:8)]  |  __inheritance  (+0)[d{LockableBase} (8:8)]
_attr          (+8)[u{._10} (4:4)]          |  _attr          (+8)[u{._10} (4:4)]
              (+12)[char[4] (4:1)]          |  _status       (+12)[int (4:4)]
_mutex        (+16)[u{._9} (40:8)]          |  _mutex        (+16)[u{._9} (40:8)]
_status       (+56)[int (4:4)]              |  ~
              (+60)[char[4] (4:1)]          |  ~

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Propose order of members in existing C++ code for minimalizing memory usage

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