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...e address of the GV, I can read the value and do XOR and then write it back. But for this case, I don't know how to do that. Maybe I am not familar with STL. I really need your help. Sorry again. for C level, char a[]="global string test"; for(i=0;i<strlen(a);i++){ a[i]= a[i]^RANDMON; } For llvm, %a = internal global [20 x sbyte] c"global string test\0A\00" Would you mind telling me how to do it. Qiuyu > > > Is there a way to reorder the basic blocks? > > Yes, for an example pass that does this, take a look at > lib/Transforms/Scalar/BasicBlo...

Hi, Thanks so much at first. > Here are some observations: > > > for C level, > > > > char a[]="global string test"; > > for(i=0;i<strlen(a);i++){ > > a[i]= a[i]^RANDMON; > > } > > If you compile this C code, "global string test" will occur in the program > binary, so you have not obfuscated anything. You can construct exactly > what you have above in LLVM (just write it as C, compile it to LLVM and > you'll see what you need to...