Initial implementation of a record-level bitcode fuzzer.

lib/Bitcode/NaCl/TestUtils/NaClFuzz.cpp

+//===- NaClFuzz.h - Fuzz PNaCl bitcode records ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a basic fuzzer for a list of PNaCl bitcode records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Bitcode/NaCl/NaClFuzz.h"
+#include "llvm/Support/Format.h"
+
+#include <array>
+#include <cmath>
+#include <cstdlib>
+#include <map>
+#include <set>
+
+
+using namespace llvm;
+using namespace naclfuzz;
+
+namespace {
+
+// Names for edit actions.
+const char *ActionNameArray[] = {
+  "Insert",
+  "Mutate",
+  "Remove",
+  "Replace",
+  "Swap"
+};
+
+} // end of anonymous namespace
+
+namespace naclfuzz {
+
+const char *RecordFuzzer::actionName(EditAction Action) {
+  return Action < array_lengthof(ActionNameArray)
+                  ? ActionNameArray[Action] : "???";
+}
+
+RecordFuzzer::RecordFuzzer(NaClMungedBitcode &Bitcode,
+                           RandomNumberGenerator &Generator)
+    : Bitcode(Bitcode), Generator(Generator) {
+  if (Bitcode.getBaseRecords().empty())
+    report_fatal_error(
+        "Sorry, the fuzzer doesn't know how to fuzz an empty record list");
+}
+
+RecordFuzzer::~RecordFuzzer() {}
+
+void RecordFuzzer::clear() {
+  Bitcode.removeEdits();
+}
+
+} // end of namespace naclfuzz