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UUID.cpp
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1 //===-- UUID.cpp ----------------------------------------------------------===//
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 
9 #include "lldb/Utility/UUID.h"
10 
11 #include "lldb/Utility/Stream.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/Support/Format.h"
14 
15 #include <cctype>
16 #include <cstdio>
17 #include <cstring>
18 
19 using namespace lldb_private;
20 
21 // Whether to put a separator after count uuid bytes.
22 // For the first 16 bytes we follow the traditional UUID format. After that, we
23 // simply put a dash after every 6 bytes.
24 static inline bool separate(size_t count) {
25  if (count >= 10)
26  return (count - 10) % 6 == 0;
27 
28  switch (count) {
29  case 4:
30  case 6:
31  case 8:
32  return true;
33  default:
34  return false;
35  }
36 }
37 
39  llvm::sys::swapByteOrder(debug_info.Uuid.Data1);
40  llvm::sys::swapByteOrder(debug_info.Uuid.Data2);
41  llvm::sys::swapByteOrder(debug_info.Uuid.Data3);
42  llvm::sys::swapByteOrder(debug_info.Age);
43  if (debug_info.Age)
44  *this = UUID(&debug_info, sizeof(debug_info));
45  else
46  *this = UUID(&debug_info.Uuid, sizeof(debug_info.Uuid));
47 }
48 
49 std::string UUID::GetAsString(llvm::StringRef separator) const {
50  std::string result;
51  llvm::raw_string_ostream os(result);
52 
53  for (auto B : llvm::enumerate(GetBytes())) {
54  if (separate(B.index()))
55  os << separator;
56 
57  os << llvm::format_hex_no_prefix(B.value(), 2, true);
58  }
59  os.flush();
60 
61  return result;
62 }
63 
64 void UUID::Dump(Stream *s) const { s->PutCString(GetAsString()); }
65 
66 static inline int xdigit_to_int(char ch) {
67  ch = tolower(ch);
68  if (ch >= 'a' && ch <= 'f')
69  return 10 + ch - 'a';
70  return ch - '0';
71 }
72 
73 llvm::StringRef
75  llvm::SmallVectorImpl<uint8_t> &uuid_bytes) {
76  uuid_bytes.clear();
77  while (p.size() >= 2) {
78  if (isxdigit(p[0]) && isxdigit(p[1])) {
79  int hi_nibble = xdigit_to_int(p[0]);
80  int lo_nibble = xdigit_to_int(p[1]);
81  // Translate the two hex nibble characters into a byte
82  uuid_bytes.push_back((hi_nibble << 4) + lo_nibble);
83 
84  // Skip both hex digits
85  p = p.drop_front(2);
86  } else if (p.front() == '-') {
87  // Skip dashes
88  p = p.drop_front();
89  } else {
90  // UUID values can only consist of hex characters and '-' chars
91  break;
92  }
93  }
94  return p;
95 }
96 
97 bool UUID::SetFromStringRef(llvm::StringRef str) {
98  llvm::StringRef p = str;
99 
100  // Skip leading whitespace characters
101  p = p.ltrim();
102 
103  llvm::SmallVector<uint8_t, 20> bytes;
104  llvm::StringRef rest = UUID::DecodeUUIDBytesFromString(p, bytes);
105 
106  // Return false if we could not consume the entire string or if the parsed
107  // UUID is empty.
108  if (!rest.empty() || bytes.empty())
109  return false;
110 
111  *this = UUID(bytes);
112  return true;
113 }
lldb_private::UUID::CvRecordPdb70::Age
llvm::support::ulittle32_t Age
Definition: UUID.h:46
separate
static bool separate(size_t count)
Definition: UUID.cpp:24
lldb_private::UUID::CvRecordPdb70::Data3
llvm::support::ulittle16_t Data3
Definition: UUID.h:43
lldb_private::UUID::CvRecordPdb70::Uuid
struct lldb_private::UUID::CvRecordPdb70::@43 Uuid
UUID.h
lldb_private::Stream
Definition: Stream.h:28
lldb_private::UUID::CvRecordPdb70::Data2
llvm::support::ulittle16_t Data2
Definition: UUID.h:42
lldb_private::UUID::UUID
UUID()=default
lldb_private::UUID::GetAsString
std::string GetAsString(llvm::StringRef separator="-") const
Definition: UUID.cpp:49
lldb_private::UUID::CvRecordPdb70::Data1
llvm::support::ulittle32_t Data1
Definition: UUID.h:41
string
string(SUBSTRING ${p} 10 -1 pStripped) if($
Definition: Plugins/CMakeLists.txt:40
lldb_private::UUID::Dump
void Dump(Stream *s) const
Definition: UUID.cpp:64
lldb_private::UUID::CvRecordPdb70
Definition: UUID.h:39
lldb_private::UUID::SetFromStringRef
bool SetFromStringRef(llvm::StringRef str)
Definition: UUID.cpp:97
lldb_private::UUID::DecodeUUIDBytesFromString
static llvm::StringRef DecodeUUIDBytesFromString(llvm::StringRef str, llvm::SmallVectorImpl< uint8_t > &uuid_bytes)
Decode as many UUID bytes as possible from the C string cstr.
Definition: UUID.cpp:74
lldb_private::B
Definition: RISCVInstructions.h:90
xdigit_to_int
static int xdigit_to_int(char ch)
Definition: UUID.cpp:66
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
Stream.h
lldb_private::Stream::PutCString
size_t PutCString(llvm::StringRef cstr)
Output a C string to the stream.
Definition: Stream.cpp:63
llvm::SmallVectorImpl
Definition: Disassembler.h:42
lldb_private::UUID::GetBytes
llvm::ArrayRef< uint8_t > GetBytes() const
Definition: UUID.h:66