[libFuzzer] initial implementation of -data_flow_trace. It parses the data flow trace and prints the summary, but doesn't use the information in any other way yet
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@334058 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/dataflow/DataFlow.cpp b/dataflow/DataFlow.cpp
index 9986307..a79c796 100644
--- a/dataflow/DataFlow.cpp
+++ b/dataflow/DataFlow.cpp
@@ -69,6 +69,7 @@
static __thread size_t CurrentFunc;
static dfsan_label *FuncLabels; // Array of NumFuncs elements.
static char *PrintableStringForLabel; // InputLen + 2 bytes.
+static bool LabelSeen[1 << 8 * sizeof(dfsan_label)];
// Prints all instrumented functions.
static int PrintFunctions() {
@@ -89,7 +90,11 @@
return 0;
}
-static void SetBytesForLabel(dfsan_label L, char *Bytes) {
+extern "C"
+void SetBytesForLabel(dfsan_label L, char *Bytes) {
+ if (LabelSeen[L])
+ return;
+ LabelSeen[L] = true;
assert(L);
if (L <= InputLen + 1) {
Bytes[L - 1] = '1';
@@ -103,6 +108,7 @@
static char *GetPrintableStringForLabel(dfsan_label L) {
memset(PrintableStringForLabel, '0', InputLen + 1);
PrintableStringForLabel[InputLen + 1] = 0;
+ memset(LabelSeen, 0, sizeof(LabelSeen));
SetBytesForLabel(L, PrintableStringForLabel);
return PrintableStringForLabel;
}