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      1 // This file is distributed under the University of Illinois Open Source
      2 // License. See LICENSE.TXT for details.
      3 
      4 // Simple test for a fuzzer.
      5 // Try to find the target using the indirect caller-callee pairs.
      6 #include <cstdint>
      7 #include <cstdlib>
      8 #include <cstddef>
      9 #include <cstring>
     10 #include <iostream>
     11 
     12 typedef void (*F)();
     13 static F t[256];
     14 
     15 void f34() {
     16   std::cerr << "BINGO\n";
     17   exit(1);
     18 }
     19 void f23() { t[(unsigned)'d'] = f34;}
     20 void f12() { t[(unsigned)'c'] = f23;}
     21 void f01() { t[(unsigned)'b'] = f12;}
     22 void f00() {}
     23 
     24 static F t0[256] = {
     25   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     26   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     27   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     28   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     29   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     30   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     31   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     32   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     33   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     34   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     35   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     36   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     37   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     38   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     39   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     40   f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00, f00,
     41 };
     42 
     43 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
     44   if (Size < 4) return 0;
     45   // Spoof the counters.
     46   for (int i = 0; i < 200; i++) {
     47     f23();
     48     f12();
     49     f01();
     50   }
     51   memcpy(t, t0, sizeof(t));
     52   t[(unsigned)'a'] = f01;
     53   t[Data[0]]();
     54   t[Data[1]]();
     55   t[Data[2]]();
     56   t[Data[3]]();
     57   return 0;
     58 }
     59 
     60