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10 Commits

Author SHA1 Message Date
Kostya Serebryany 1838561dfe [sanitizer-coverage] remove more unused code 
llvm-svn: 300780
 2017-04-19 23:05:53 +00:00
Kostya Serebryany d32bc3ee38 [sanitizer-coverage] remove run-time support for -fsanitize-coverage=indirect-calls 
llvm-svn: 300775
 2017-04-19 22:24:03 +00:00
Kostya Serebryany b45905c5a9 [sanitizer-coverage] remove run-time support for the deprecated -fsanitize-coverage=8bit-counters 
llvm-svn: 300745
 2017-04-19 20:17:41 +00:00
Mike Aizatsky aaa637001a [sancov] __sanitizer_dump_coverage api 
Subscribers: kubabrecka, mgorny

Differential Revision: https://reviews.llvm.org/D26758

llvm-svn: 289498
 2016-12-12 23:45:38 +00:00
Kostya Serebryany e923a1a486 [sanitizer-coverage] remove stale code, second attempt after failed r282994 
llvm-svn: 283185
 2016-10-04 04:18:30 +00:00
Mike Aizatsky 04897dcc3d [sanitizers] trace buffer API to use user-allocated buffer. 
Subscribers: kubabrecka

Differential Revision: https://reviews.llvm.org/D23186

llvm-svn: 277858
 2016-08-05 20:09:42 +00:00
Mike Aizatsky 54fc6575c5 [sancov] coverage pc buffer 
Differential Revision: http://reviews.llvm.org/D15871

llvm-svn: 256804
 2016-01-05 01:49:39 +00:00
Kostya Serebryany e3d25c3873 [sanitizer-coverage] introduce __sanitizer_get_total_unique_caller_callee_pairs 
llvm-svn: 251071
 2015-10-22 22:06:41 +00:00
Kostya Serebryany be5e0ed919 [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
Kostya Serebryany cc0c773f76 [sanitizer] move the coverage interface into a separate header, <sanitizer/coverage_interface.h>. NFC, except for the header name change. This may break existing users, but in this case it's better this way (not too many users so far) 
llvm-svn: 228017
 2015-02-03 19:40:53 +00:00