aboutsummaryrefslogtreecommitdiffstats
path: root/Common/ErrorHandler.cpp
blob: b91854c51cef8138d8b806137121de43fd70c2a9 (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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
//===- ErrorHandler.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
//
//===----------------------------------------------------------------------===//

#include "lld/Common/ErrorHandler.h"

#include "lld/Common/Threads.h"

#include "llvm/ADT/Twine.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
#include <mutex>
#include <regex>

#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#endif

using namespace llvm;
using namespace lld;

// The functions defined in this file can be called from multiple threads,
// but outs() or errs() are not thread-safe. We protect them using a mutex.
static std::mutex mu;

// We want to separate multi-line messages with a newline. `sep` is "\n"
// if the last messages was multi-line. Otherwise "".
static StringRef sep;

static StringRef getSeparator(const Twine &msg) {
  if (StringRef(msg.str()).contains('\n'))
    return "\n";
  return "";
}

ErrorHandler &lld::errorHandler() {
  static ErrorHandler handler;
  return handler;
}

void lld::enableColors(bool enable) {
  errorHandler().errorOS->enable_colors(enable);
}

void lld::exitLld(int val) {
  // Delete any temporary file, while keeping the memory mapping open.
  if (errorHandler().outputBuffer)
    errorHandler().outputBuffer->discard();

  // Dealloc/destroy ManagedStatic variables before calling
  // _exit(). In a non-LTO build, this is a nop. In an LTO
  // build allows us to get the output of -time-passes.
  llvm_shutdown();

  outs().flush();
  errs().flush();
  _exit(val);
}

void lld::diagnosticHandler(const DiagnosticInfo &di) {
  SmallString<128> s;
  raw_svector_ostream os(s);
  DiagnosticPrinterRawOStream dp(os);
  di.print(dp);
  switch (di.getSeverity()) {
  case DS_Error:
    error(s);
    break;
  case DS_Warning:
    warn(s);
    break;
  case DS_Remark:
  case DS_Note:
    message(s);
    break;
  }
}

void lld::checkError(Error e) {
  handleAllErrors(std::move(e),
                  [&](ErrorInfoBase &eib) { error(eib.message()); });
}

// This is for --vs-diagnostics.
//
// Normally, lld's error message starts with argv[0]. Therefore, it usually
// looks like this:
//
//   ld.lld: error: ...
//
// This error message style is unfortunately unfriendly to Visual Studio
// IDE. VS interprets the first word of the first line as an error location
// and make it clickable, thus "ld.lld" in the above message would become a
// clickable text. When you click it, VS opens "ld.lld" executable file with
// a binary editor.
//
// As a workaround, we print out an error location instead of "ld.lld" if
// lld is running in VS diagnostics mode. As a result, error message will
// look like this:
//
//   src/foo.c(35): error: ...
//
// This function returns an error location string. An error location is
// extracted from an error message using regexps.
std::string ErrorHandler::getLocation(const Twine &msg) {
  if (!vsDiagnostics)
    return logName;

  static std::regex regexes[] = {
      std::regex(
          R"(^undefined (?:\S+ )?symbol:.*\n)"
          R"(>>> referenced by .+\((\S+):(\d+)\))"),
      std::regex(
          R"(^undefined (?:\S+ )?symbol:.*\n>>> referenced by (\S+):(\d+))"),
      std::regex(R"(^undefined symbol:.*\n>>> referenced by (.*):)"),
      std::regex(
          R"(^duplicate symbol: .*\n>>> defined in (\S+)\n>>> defined in.*)"),
      std::regex(
          R"(^duplicate symbol: .*\n>>> defined at .+\((\S+):(\d+)\))"),
      std::regex(R"(^duplicate symbol: .*\n>>> defined at (\S+):(\d+))"),
      std::regex(
          R"(.*\n>>> defined in .*\n>>> referenced by .+\((\S+):(\d+)\))"),
      std::regex(R"(.*\n>>> defined in .*\n>>> referenced by (\S+):(\d+))"),
      std::regex(R"((\S+):(\d+): unclosed quote)"),
  };

  std::string str = msg.str();
  for (std::regex &re : regexes) {
    std::smatch m;
    if (!std::regex_search(str, m, re))
      continue;

    assert(m.size() == 2 || m.size() == 3);
    if (m.size() == 2)
      return m.str(1);
    return m.str(1) + "(" + m.str(2) + ")";
  }

  return logName;
}

void ErrorHandler::log(const Twine &msg) {
  if (!verbose)
    return;
  std::lock_guard<std::mutex> lock(mu);
  *errorOS << logName << ": " << msg << "\n";
}

void ErrorHandler::message(const Twine &msg) {
  std::lock_guard<std::mutex> lock(mu);
  outs() << msg << "\n";
  outs().flush();
}

void ErrorHandler::warn(const Twine &msg) {
  if (fatalWarnings) {
    error(msg);
    return;
  }

  std::lock_guard<std::mutex> lock(mu);
  *errorOS << sep << getLocation(msg) << ": " << Colors::MAGENTA
           << "warning: " << Colors::RESET << msg << "\n";
  sep = getSeparator(msg);
}

void ErrorHandler::error(const Twine &msg) {
  // If Visual Studio-style error message mode is enabled,
  // this particular error is printed out as two errors.
  if (vsDiagnostics) {
    static std::regex re(R"(^(duplicate symbol: .*))"
                         R"((\n>>> defined at \S+:\d+.*\n>>>.*))"
                         R"((\n>>> defined at \S+:\d+.*\n>>>.*))");
    std::string str = msg.str();
    std::smatch m;

    if (std::regex_match(str, m, re)) {
      error(m.str(1) + m.str(2));
      error(m.str(1) + m.str(3));
      return;
    }
  }

  std::lock_guard<std::mutex> lock(mu);

  if (errorLimit == 0 || errorCount < errorLimit) {
    *errorOS << sep << getLocation(msg) << ": " << Colors::RED
             << "error: " << Colors::RESET << msg << "\n";
  } else if (errorCount == errorLimit) {
    *errorOS << sep << getLocation(msg) << ": " << Colors::RED
             << "error: " << Colors::RESET << errorLimitExceededMsg << "\n";
    if (exitEarly)
      exitLld(1);
  }

  sep = getSeparator(msg);
  ++errorCount;
}

void ErrorHandler::fatal(const Twine &msg) {
  error(msg);
  exitLld(1);
}