[libFuzzer] extend -print_coverage to also print uncovered lines, functions, and files.
Example of output:
COVERAGE:
COVERED: in DSO2(int) /pathto/DSO2.cpp:6
COVERED: in DSO2(int) /pathto/DSO2.cpp:8
COVERED: in DSO1(int) /pathto/DSO1.cpp:6
COVERED: in DSO1(int) /pathto/DSO1.cpp:8
COVERED: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:16
COVERED: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:19
COVERED: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:25
COVERED: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:26
MODULE_WITH_COVERAGE: /pathto/libLLVMFuzzer-DSO1.so
UNCOVERED_LINE: in DSO1(int) /pathto/DSO1.cpp:9
UNCOVERED_FUNC: in Uncovered1()
MODULE_WITH_COVERAGE: /pathto/libLLVMFuzzer-DSO2.so
UNCOVERED_LINE: in DSO2(int) /pathto/DSO2.cpp:9
UNCOVERED_FUNC: in Uncovered2()
MODULE_WITH_COVERAGE: /pathto/LLVMFuzzer-DSOTest
UNCOVERED_LINE: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:21
UNCOVERED_LINE: in LLVMFuzzerTestOneInput /pathto/DSOTestMain.cpp:27
UNCOVERED_FILE: /pathto/DSOTestExtra.cpp
Several things are not perfect here:
* we are using objdump+awk instead of sancov because sancov does not support DSOs yet.
* this breaks in the presence of ASAN_OPTIONS=strip_path_prefix=...
(need to implement another API to get the module name by PC)
llvm-svn: 284554
diff --git a/llvm/lib/Fuzzer/test/DSOTestMain.cpp b/llvm/lib/Fuzzer/test/DSOTestMain.cpp
index 49cd185..3e225d88 100644
--- a/llvm/lib/Fuzzer/test/DSOTestMain.cpp
+++ b/llvm/lib/Fuzzer/test/DSOTestMain.cpp
@@ -11,17 +11,21 @@
extern int DSO2(int a);
extern int DSOTestExtra(int a);
+static volatile int *nil = 0;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
- if (Size < sizeof(int) * 3) return 0;
int x, y, z;
- memcpy(&x, Data + 0 * sizeof(int), sizeof(int));
- memcpy(&y, Data + 1 * sizeof(int), sizeof(int));
- memcpy(&z, Data + 2 * sizeof(int), sizeof(int));
- int sum = DSO1(x) + DSO2(y) + DSOTestExtra(z);
+ if (Size < sizeof(int) * 3) {
+ x = y = z = 0;
+ } else {
+ memcpy(&x, Data + 0 * sizeof(int), sizeof(int));
+ memcpy(&y, Data + 1 * sizeof(int), sizeof(int));
+ memcpy(&z, Data + 2 * sizeof(int), sizeof(int));
+ }
+ int sum = DSO1(x) + DSO2(y) + (z ? DSOTestExtra(z) : 0);
if (sum == 3) {
fprintf(stderr, "BINGO %d %d %d\n", x, y, z);
- exit(1);
+ *nil = 0;
}
return 0;
}