1 //===- FuzzerUtil.h - Internal header for the Fuzzer Utils ------*- C++ -* ===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 // Util functions.
9 //===----------------------------------------------------------------------===//
10 
11 #ifndef LLVM_FUZZER_UTIL_H
12 #define LLVM_FUZZER_UTIL_H
13 
14 #include "FuzzerBuiltins.h"
15 #include "FuzzerBuiltinsMsvc.h"
16 #include "FuzzerCommand.h"
17 #include "FuzzerDefs.h"
18 
19 namespace fuzzer {
20 
21 void PrintHexArray(const Unit &U, const char *PrintAfter = "");
22 
23 void PrintHexArray(const uint8_t *Data, size_t Size,
24                    const char *PrintAfter = "");
25 
26 void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter = "");
27 
28 void PrintASCII(const Unit &U, const char *PrintAfter = "");
29 
30 // Changes U to contain only ASCII (isprint+isspace) characters.
31 // Returns true iff U has been changed.
32 bool ToASCII(uint8_t *Data, size_t Size);
33 
34 bool IsASCII(const Unit &U);
35 
36 bool IsASCII(const uint8_t *Data, size_t Size);
37 
38 std::string Base64(const Unit &U);
39 
40 void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC);
41 
42 std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC);
43 
44 void PrintStackTrace();
45 
46 void PrintMemoryProfile();
47 
48 unsigned NumberOfCpuCores();
49 
50 // Platform specific functions.
51 void SetSignalHandler(const FuzzingOptions& Options);
52 
53 void SleepSeconds(int Seconds);
54 
55 unsigned long GetPid();
56 
57 size_t GetPeakRSSMb();
58 
59 int ExecuteCommand(const Command &Cmd);
60 bool ExecuteCommand(const Command &Cmd, std::string *CmdOutput);
61 
62 // Fuchsia does not have popen/pclose.
63 FILE *OpenProcessPipe(const char *Command, const char *Mode);
64 int CloseProcessPipe(FILE *F);
65 
66 const void *SearchMemory(const void *haystack, size_t haystacklen,
67                          const void *needle, size_t needlelen);
68 
69 std::string CloneArgsWithoutX(const Vector<std::string> &Args,
70                               const char *X1, const char *X2);
71 
72 inline std::string CloneArgsWithoutX(const Vector<std::string> &Args,
73                                      const char *X) {
74   return CloneArgsWithoutX(Args, X, X);
75 }
76 
77 inline std::pair<std::string, std::string> SplitBefore(std::string X,
78                                                        std::string S) {
79   auto Pos = S.find(X);
80   if (Pos == std::string::npos)
81     return std::make_pair(S, "");
82   return std::make_pair(S.substr(0, Pos), S.substr(Pos));
83 }
84 
85 void DiscardOutput(int Fd);
86 
87 std::string DisassembleCmd(const std::string &FileName);
88 
89 std::string SearchRegexCmd(const std::string &Regex);
90 
91 size_t SimpleFastHash(const uint8_t *Data, size_t Size);
92 
93 inline uint32_t Log(uint32_t X) { return 32 - Clz(X) - 1; }
94 
95 inline size_t PageSize() { return 4096; }
96 inline uint8_t *RoundUpByPage(uint8_t *P) {
97   uintptr_t X = reinterpret_cast<uintptr_t>(P);
98   size_t Mask = PageSize() - 1;
99   X = (X + Mask) & ~Mask;
100   return reinterpret_cast<uint8_t *>(X);
101 }
102 inline uint8_t *RoundDownByPage(uint8_t *P) {
103   uintptr_t X = reinterpret_cast<uintptr_t>(P);
104   size_t Mask = PageSize() - 1;
105   X = X & ~Mask;
106   return reinterpret_cast<uint8_t *>(X);
107 }
108 
109 #if __BYTE_ORDER == __LITTLE_ENDIAN
110 template <typename T> T HostToLE(T X) { return X; }
111 #else
112 template <typename T> T HostToLE(T X) { return Bswap(X); }
113 #endif
114 
115 }  // namespace fuzzer
116 
117 #endif  // LLVM_FUZZER_UTIL_H
118