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llvm-mirror/cmake
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Kostya Serebryany 285f1f0e41 [sanitizer/coverage] Add AFL-style coverage counters (search heuristic for fuzzing). 
Introduce -mllvm -sanitizer-coverage-8bit-counters=1
which adds imprecise thread-unfriendly 8-bit coverage counters.

The run-time library maps these 8-bit counters to 8-bit bitsets in the same way
AFL (http://lcamtuf.coredump.cx/afl/technical_details.txt) does:
counter values are divided into 8 ranges and based on the counter
value one of the bits in the bitset is set.
The AFL ranges are used here: 1, 2, 3, 4-7, 8-15, 16-31, 32-127, 128+.

These counters provide a search heuristic for single-threaded
coverage-guided fuzzers, we do not expect them to be useful for other purposes.

Depending on the value of -fsanitize-coverage=[123] flag,
these counters will be added to the function entry blocks (=1),
every basic block (=2), or every edge (=3).

Use these counters as an optional search heuristic in the Fuzzer library.
Add a test where this heuristic is critical.

llvm-svn: 231166
2015-03-03 23:27:02 +00:00
..
modules [sanitizer/coverage] Add AFL-style coverage counters (search heuristic for fuzzing). 2015-03-03 23:27:02 +00:00
platforms Updating iOS.cmake to work with the latest Xcode and iOS 8 SDK. 2015-01-30 00:10:47 +00:00
config-ix.cmake Remove log statements from config scripts. 2015-02-22 07:31:42 +00:00
Makefile Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
nsis_icon.ico Win installer: provide a pretty icon 2014-03-27 20:48:37 +00:00
nsis_logo.bmp CMake: polish the Windows packaging rules 2013-08-15 23:44:31 +00:00
README

README 

See docs/CMake.html for instructions on how to build LLVM with CMake.