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# custum mutator: libfuzzer LLVMFuzzerMutate()
This uses the libfuzzer LLVMFuzzerMutate() function in llvm 12.
just type `make` to build
```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/libfuzzer/libfuzzer-mutator.so afl-fuzz ...```
Note that is is currently simple and is missing two features:
* Splicing ("Crossover")
* Dictionary support
To update the source, all that is needed is that FuzzerDriver.cpp has to receive
```
#include "libfuzzer.inc"
```
before the closing namespace bracket.
It is also libfuzzer.inc where the configuration of the libfuzzer mutations
are done.
> Original repository: https://github.com/llvm/llvm-project
> Path: compiler-rt/lib/fuzzer/*.{h|cpp}
> Source commit: d4b88ac1658d681e143482336cac27c6a74b8b24
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