aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/llvm14/tools/llvm-cxxmap/llvm-cxxmap.cpp
blob: 1e18e379f23cf1ef06d5985bb9efdddbe2243a88 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
//===- llvm-cxxmap.cpp ----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// llvm-cxxmap computes a correspondence between old symbol names and new
// symbol names based on a symbol equivalence file.
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SymbolRemappingReader.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

cl::OptionCategory CXXMapCategory("CXX Map Options");

cl::opt<std::string> OldSymbolFile(cl::Positional, cl::Required,
                                   cl::desc("<symbol-file>"),
                                   cl::cat(CXXMapCategory));
cl::opt<std::string> NewSymbolFile(cl::Positional, cl::Required,
                                   cl::desc("<symbol-file>"),
                                   cl::cat(CXXMapCategory));
cl::opt<std::string> RemappingFile("remapping-file", cl::Required,
                                   cl::desc("Remapping file"),
                                   cl::cat(CXXMapCategory));
cl::alias RemappingFileA("r", cl::aliasopt(RemappingFile),
                         cl::cat(CXXMapCategory));
cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
                                    cl::init("-"), cl::desc("Output file"),
                                    cl::cat(CXXMapCategory));
cl::alias OutputFilenameA("o", cl::aliasopt(OutputFilename),
                          cl::cat(CXXMapCategory));

cl::opt<bool> WarnAmbiguous(
    "Wambiguous",
    cl::desc("Warn on equivalent symbols in the output symbol list"),
    cl::cat(CXXMapCategory));
cl::opt<bool> WarnIncomplete(
    "Wincomplete",
    cl::desc("Warn on input symbols missing from output symbol list"),
    cl::cat(CXXMapCategory));

static void warn(Twine Message, Twine Whence = "",
                 std::string Hint = "") {
  WithColor::warning();
  std::string WhenceStr = Whence.str();
  if (!WhenceStr.empty())
    errs() << WhenceStr << ": ";
  errs() << Message << "\n";
  if (!Hint.empty())
    WithColor::note() << Hint << "\n";
}

static void exitWithError(Twine Message, Twine Whence = "",
                          std::string Hint = "") {
  WithColor::error();
  std::string WhenceStr = Whence.str();
  if (!WhenceStr.empty())
    errs() << WhenceStr << ": ";
  errs() << Message << "\n";
  if (!Hint.empty())
    WithColor::note() << Hint << "\n";
  ::exit(1);
}

static void exitWithError(Error E, StringRef Whence = "") {
  exitWithError(toString(std::move(E)), Whence);
}

static void exitWithErrorCode(std::error_code EC, StringRef Whence = "") {
  exitWithError(EC.message(), Whence);
}

static void remapSymbols(MemoryBuffer &OldSymbolFile,
                         MemoryBuffer &NewSymbolFile,
                         MemoryBuffer &RemappingFile,
                         raw_ostream &Out) {
  // Load the remapping file and prepare to canonicalize symbols.
  SymbolRemappingReader Reader;
  if (Error E = Reader.read(RemappingFile))
    exitWithError(std::move(E));

  // Canonicalize the new symbols.
  DenseMap<SymbolRemappingReader::Key, StringRef> MappedNames;
  DenseSet<StringRef> UnparseableSymbols;
  for (line_iterator LineIt(NewSymbolFile, /*SkipBlanks=*/true, '#');
       !LineIt.is_at_eof(); ++LineIt) {
    StringRef Symbol = *LineIt;

    auto K = Reader.insert(Symbol);
    if (!K) {
      UnparseableSymbols.insert(Symbol);
      continue;
    }

    auto ItAndIsNew = MappedNames.insert({K, Symbol});
    if (WarnAmbiguous && !ItAndIsNew.second &&
        ItAndIsNew.first->second != Symbol) {
      warn("symbol " + Symbol + " is equivalent to earlier symbol " +
               ItAndIsNew.first->second,
           NewSymbolFile.getBufferIdentifier() + ":" +
               Twine(LineIt.line_number()),
           "later symbol will not be the target of any remappings");
    }
  }

  // Figure out which new symbol each old symbol is equivalent to.
  for (line_iterator LineIt(OldSymbolFile, /*SkipBlanks=*/true, '#');
       !LineIt.is_at_eof(); ++LineIt) {
    StringRef Symbol = *LineIt;

    auto K = Reader.lookup(Symbol);
    StringRef NewSymbol = MappedNames.lookup(K);

    if (NewSymbol.empty()) {
      if (WarnIncomplete && !UnparseableSymbols.count(Symbol)) {
        warn("no new symbol matches old symbol " + Symbol,
             OldSymbolFile.getBufferIdentifier() + ":" +
                 Twine(LineIt.line_number()));
      }
      continue;
    }

    Out << Symbol << " " << NewSymbol << "\n";
  }
}

int main(int argc, const char *argv[]) {
  InitLLVM X(argc, argv);

  cl::HideUnrelatedOptions({&CXXMapCategory, &getColorCategory()});
  cl::ParseCommandLineOptions(argc, argv, "LLVM C++ mangled name remapper\n");

  auto OldSymbolBufOrError = MemoryBuffer::getFileOrSTDIN(OldSymbolFile);
  if (!OldSymbolBufOrError)
    exitWithErrorCode(OldSymbolBufOrError.getError(), OldSymbolFile);

  auto NewSymbolBufOrError = MemoryBuffer::getFileOrSTDIN(NewSymbolFile);
  if (!NewSymbolBufOrError)
    exitWithErrorCode(NewSymbolBufOrError.getError(), NewSymbolFile);

  auto RemappingBufOrError = MemoryBuffer::getFileOrSTDIN(RemappingFile);
  if (!RemappingBufOrError)
    exitWithErrorCode(RemappingBufOrError.getError(), RemappingFile);

  std::error_code EC;
  raw_fd_ostream OS(OutputFilename.data(), EC, sys::fs::OF_TextWithCRLF);
  if (EC)
    exitWithErrorCode(EC, OutputFilename);

  remapSymbols(*OldSymbolBufOrError.get(), *NewSymbolBufOrError.get(),
               *RemappingBufOrError.get(), OS);
}