llvm-svn: 153878

Fixing a whole class of crashers and potential crashers related to data formatters eating up all the stack when an unknown class has to be summarized ; this should make the whole Objective-C summaries more stable

llvm-svn: 153712

The Cocoa formatters now provide error messages for many of the common things-went-wrong situations. Previously they would say nothing or log failures to the Python console

llvm-svn: 152673

 (a) the SystemParameters object is now passed around to the formatters; doing so enables the formatters to reuse computed values for things such as pointer-size and endianness
     instead of repeatedly computing these on their own
 (b) replacing the global ISA cache with a per-process one
 (c) providing a per-process types cache where each formatter can store the types it needs to operate, and be sure to find them the next time without recalculating them
     this also enables formatters to share types if they agree on a local naming convention
 (d) lazy fetching of data from Objective-C runtime data structures
     data is fetched as needed and we stop reading as soon as we determine that an ISA is actually garbage

llvm-svn: 152052

fixed a few potential NULL-pointer derefs in ValueObject
we have a way to provide docstrings for properties we add to the SWIG layer - a few of these properties have a docstring already, more will come in future commits
added a new bunch of properties to SBData to make it more natural and Python-like to access the data they contain

llvm-svn: 151962