[libFuzzer] reinstate -dump_coverage, which is still in use (reverts r332036)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@332876 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/fuzzer/FuzzerTracePC.cpp b/lib/fuzzer/FuzzerTracePC.cpp
index ed62cdcf4..fb8544f9c 100644
--- a/lib/fuzzer/FuzzerTracePC.cpp
+++ b/lib/fuzzer/FuzzerTracePC.cpp
@@ -298,6 +298,15 @@ void TracePC::PrintCoverage() {
   IterateCoveredFunctions(CoveredFunctionCallback);
 }
 
+void TracePC::DumpCoverage() {
+  if (EF->__sanitizer_dump_coverage) {
+    Vector<uintptr_t> PCsCopy(GetNumPCs());
+    for (size_t i = 0; i < GetNumPCs(); i++)
+      PCsCopy[i] = PCs()[i] ? GetPreviousInstructionPc(PCs()[i]) : 0;
+    EF->__sanitizer_dump_coverage(PCsCopy.data(), PCsCopy.size());
+  }
+}
+
 // Value profile.
 // We keep track of various values that affect control flow.
 // These values are inserted into a bit-set-based hash map.