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# CmpLog instrumentation
The CmpLog instrumentation enables the logging of the comparisons operands in a
shared memory.
These values can be used by various mutators built on top of it.
At the moment we support the RedQueen mutator (input-2-state instructions only).
## Build
To use CmpLog, you have to build two versions of the instrumented target
program.
The first version is built using the regular AFL++ instrumentation.
The second one, the CmpLog binary, with setting AFL_LLVM_CMPLOG during the compilation.
For example:
```
./configure --cc=~/path/to/afl-clang-fast
make
cp ./program ./program.afl
make clean
export AFL_LLVM_CMPLOG=1
./configure --cc=~/path/to/afl-clang-fast
make
cp ./program ./program.cmplog
```
## Use
AFL++ has the new -c option that can be used to specify a CmpLog binary (the second
build).
For example:
```
afl-fuzz -i input -o output -c ./program.cmplog -m none -- ./program.afl @@
```
Be careful to use -m none because CmpLog maps a lot of pages.
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