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[libFuzzer] Mutation tracking and logging implemented.
Summary: Code now exists to track number of mutations that are used in fuzzing in total and ones that produce new coverage. The stats are currently being dumped to the command line. Patch by Kodé Williams (@kodewilliams). Reviewers: metzman, Dor1s, morehouse, kcc Reviewed By: Dor1s, morehouse, kcc Subscribers: delcypher, kubamracek, kcc, morehouse, llvm-commits, #sanitizers, mgorny Differential Revision: https://reviews.llvm.org/D48054 llvm-svn: 337324
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RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-MutationStatsTest | ||
RUN: not %run %t-MutationStatsTest -print_mutation_stats=1 2>&1 | FileCheck %s | ||
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# Ensures there are some non-zero values in the usefulness percentages printed. | ||
CHECK: stat::mutation_usefulness: {{[0-9]+\.[0-9]+}} |