[libFuzzer] make one test faster, fix compiler warnings in tests

llvm-svn: 308945

Author: kcc

llvm/lib/Fuzzer/test/SingleMemcmpTest.cpp

@@ -8,7 +8,7 @@
 #include <cstring>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
-  char *S = (char*)Data;
+  const char *S = (const char*)Data;
   if (Size >= 6 && !memcmp(S, "qwerty", 6)) {
     fprintf(stderr, "BINGO\n");
     exit(1);

llvm/lib/Fuzzer/test/StrcmpTest.cpp

@@ -13,7 +13,7 @@ bool Eq(const uint8_t *Data, size_t Size, const char *Str) {
   size_t Len = strlen(Str);
   if (Size < Len) return false;
   if (Len >= sizeof(Buff)) return false;
-  memcpy(Buff, (char*)Data, Len);
+  memcpy(Buff, (const char*)Data, Len);
   Buff[Len] = 0;
   int res = strcmp(Buff, Str);
   return res == 0;

llvm/lib/Fuzzer/test/StrncmpTest.cpp

@@ -11,7 +11,7 @@ static volatile int sink;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   // TODO: check other sizes.
-  char *S = (char*)Data;
+  const char *S = (const char*)Data;
   if (Size >= 8 && strncmp(S, "123", 8))
     sink = 1;
   if (Size >= 8 && strncmp(S, "01234567", 8) == 0) {

llvm/lib/Fuzzer/test/value-profile-cmp2.test

@@ -1,2 +1,2 @@
 CHECK: BINGO
-RUN: not LLVMFuzzer-SimpleHashTest -seed=1 -use_cmp=0 -use_value_profile=1 -runs=100000000 2>&1 | FileCheck %s
+RUN: not LLVMFuzzer-SimpleHashTest -seed=1 -use_cmp=0 -use_value_profile=1 -runs=100000000 -max_len=64 2>&1 | FileCheck %s