1 files changed, 47 insertions, 0 deletions
diff --git a/test/fuzzer/SimpleCmpTest.cpp b/test/fuzzer/SimpleCmpTest.cpp
new file mode 100644
index 000000000000..8acad4ac77e8
--- /dev/null
+++ b/test/fuzzer/SimpleCmpTest.cpp
@@ -0,0 +1,47 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Simple test for a fuzzer. The fuzzer must find several narrow ranges.
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+extern int AllLines[];
+
+bool PrintOnce(int Line) {
+  if (!AllLines[Line])
+    fprintf(stderr, "Seen line %d\n", Line);
+  AllLines[Line] = 1;
+  return true;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  if (Size != 22) return 0;
+  uint64_t x = 0;
+  int64_t  y = 0;
+  int32_t z = 0;
+  uint16_t a = 0;
+  memcpy(&x, Data, 8);  // 8
+  memcpy(&y, Data + 8, 8);  // 16
+  memcpy(&z, Data + 16, sizeof(z));  // 20
+  memcpy(&a, Data + 20, sizeof(a));  // 22
+  const bool k32bit = sizeof(void*) == 4;
+
+  if ((k32bit || x > 1234567890) && PrintOnce(__LINE__) &&
+      (k32bit || x < 1234567895) && PrintOnce(__LINE__) &&
+      a == 0x4242 && PrintOnce(__LINE__) &&
+      (k32bit || y >= 987654321) && PrintOnce(__LINE__) &&
+      (k32bit || y <= 987654325) && PrintOnce(__LINE__) &&
+      z < -10000 && PrintOnce(__LINE__) &&
+      z >= -10005 && PrintOnce(__LINE__) &&
+      z != -10003 && PrintOnce(__LINE__) &&
+      true) {
+    fprintf(stderr, "BINGO; Found the target: size %zd (%zd, %zd, %d, %d), exiting.\n",
+            Size, x, y, z, a);
+    exit(1);
+  }
+  return 0;
+}
+
+int AllLines[__LINE__ + 1];  // Must be the last line.