gcc folder: 
The source code for Record and Replay
====================== FILEs added ==========================
A dump-sourcec.c
A gimple-pretty-print-c.c
A tree-pretty-print-c.c
A instr-sourcec.c 
A instr-sourcec.h 
A spec-func-list.h

===================== FILEs Modified =========================
=== searching "wang80" to find the modefied places ===========  
M gimple-pretty-print.h
M tree-pretty-print.h
M passes.c
M tree-pass.h
M Makefile.in
M common.opt
M opts.c
M cgraph.h 


sample folder:
An sample for generating record and replay code 



