LGTM - just a few small notes


http://codereview.appspot.com/195042/diff/1/5
File src/liboslexec/exec.cpp (right):

http://codereview.appspot.com/195042/diff/1/5#newcode191
src/liboslexec/exec.cpp:191: VaryingRef<float> * valref = NULL, *dxref =
NULL, *dyref = NULL;
This is a big confusing - they all get turned into a VaryingRef to
floats even though they all have different types. Maybe a comment could
explain why this isn't important here.

http://codereview.appspot.com/195042/diff/1/5#newcode310
src/liboslexec/exec.cpp:310: // Uninitialized strings in the heap can
really screw
Could we mark this as temporary? I really think it would be better to
guarantee this on the compiler side.

http://codereview.appspot.com/195042/show