Move libFuzzer to compiler_rt.
Resulting library binaries will be named libclang_rt.fuzzer*, and will
be placed in Clang toolchain, allowing redistribution.
Differential Revision: https://reviews.llvm.org/D36908
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@311407 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerCrossOver.cpp b/FuzzerCrossOver.cpp
new file mode 100644
index 0000000..8b0fd7d
--- /dev/null
+++ b/FuzzerCrossOver.cpp
@@ -0,0 +1,52 @@
+//===- FuzzerCrossOver.cpp - Cross over two test inputs -------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Cross over test inputs.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#include "FuzzerMutate.h"
+#include "FuzzerRandom.h"
+#include <cstring>
+
+namespace fuzzer {
+
+// Cross Data1 and Data2, store the result (up to MaxOutSize bytes) in Out.
+size_t MutationDispatcher::CrossOver(const uint8_t *Data1, size_t Size1,
+ const uint8_t *Data2, size_t Size2,
+ uint8_t *Out, size_t MaxOutSize) {
+ assert(Size1 || Size2);
+ MaxOutSize = Rand(MaxOutSize) + 1;
+ size_t OutPos = 0;
+ size_t Pos1 = 0;
+ size_t Pos2 = 0;
+ size_t *InPos = &Pos1;
+ size_t InSize = Size1;
+ const uint8_t *Data = Data1;
+ bool CurrentlyUsingFirstData = true;
+ while (OutPos < MaxOutSize && (Pos1 < Size1 || Pos2 < Size2)) {
+ // Merge a part of Data into Out.
+ size_t OutSizeLeft = MaxOutSize - OutPos;
+ if (*InPos < InSize) {
+ size_t InSizeLeft = InSize - *InPos;
+ size_t MaxExtraSize = std::min(OutSizeLeft, InSizeLeft);
+ size_t ExtraSize = Rand(MaxExtraSize) + 1;
+ memcpy(Out + OutPos, Data + *InPos, ExtraSize);
+ OutPos += ExtraSize;
+ (*InPos) += ExtraSize;
+ }
+ // Use the other input data on the next iteration.
+ InPos = CurrentlyUsingFirstData ? &Pos2 : &Pos1;
+ InSize = CurrentlyUsingFirstData ? Size2 : Size1;
+ Data = CurrentlyUsingFirstData ? Data2 : Data1;
+ CurrentlyUsingFirstData = !CurrentlyUsingFirstData;
+ }
+ return OutPos;
+}
+
+} // namespace fuzzer