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Diffstat (limited to 'clang/docs')
| -rw-r--r-- | clang/docs/SanitizerCoverage.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/clang/docs/SanitizerCoverage.rst b/clang/docs/SanitizerCoverage.rst index 65af6ffbf01..efcb49e6eb4 100644 --- a/clang/docs/SanitizerCoverage.rst +++ b/clang/docs/SanitizerCoverage.rst @@ -249,6 +249,33 @@ These counters may also be used for in-process coverage-guided fuzzers. See uintptr_t __sanitizer_update_counter_bitset_and_clear_counters(uint8_t *bitset); +Tracing data flow +================= + +An *experimental* feature to support data-flow-guided fuzzing. +With ``-fsanitize-coverage=trace-cmp`` the compiler will insert extra instrumentation +around comparison instructions and switch statements. +The fuzzer will need to define the following functions, +they will be called by the instrumented code. + +.. code-block:: c++ + + // Called before a comparison instruction. + // SizeAndType is a packed value containing + // - [63:32] the Size of the operands of comparison in bits + // - [31:0] the Type of comparison (one of ICMP_EQ, ... ICMP_SLE) + // Arg1 and Arg2 are arguments of the comparison. + void __sanitizer_cov_trace_cmp(uint64_t SizeAndType, uint64_t Arg1, uint64_t Arg2); + + // Called before a switch statement. + // Val is the switch operand. + // Cases[0] is the number of case constants. + // Cases[1] is the size of Val in bits. + // Cases[2:] are the case constants. + void __sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases); + +This interface is a subject to change. + Output directory ================ |
