aboutsummaryrefslogtreecommitdiff
path: root/source/Utility/Status.cpp
blob: ba87d3e5144f259521073d00bf59406f27bbb897 (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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
//===-- Status.cpp -----------------------------------------------*- C++
//-*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/Utility/Status.h"

#include "lldb/Utility/VASPrintf.h"
#include "lldb/lldb-defines.h"            // for LLDB_GENERIC_ERROR
#include "lldb/lldb-enumerations.h"       // for ErrorType, ErrorType::eErr...
#include "llvm/ADT/SmallString.h"         // for SmallString
#include "llvm/ADT/StringRef.h"           // for StringRef
#include "llvm/Support/FormatProviders.h" // for format_provider

#include <cerrno>
#include <cstdarg>
#include <string> // for string
#include <system_error>

#ifdef __APPLE__
#include <mach/mach.h>
#endif

#include <stdint.h> // for uint32_t
#include <string.h> // for strerror

namespace llvm {
class raw_ostream;
}

using namespace lldb;
using namespace lldb_private;

Status::Status() : m_code(0), m_type(eErrorTypeInvalid), m_string() {}

Status::Status(ValueType err, ErrorType type)
    : m_code(err), m_type(type), m_string() {}

Status::Status(std::error_code EC)
    : m_code(EC.value()), m_type(ErrorType::eErrorTypeGeneric),
      m_string(EC.message()) {}

Status::Status(const Status &rhs) = default;

Status::Status(const char *format, ...)
    : m_code(0), m_type(eErrorTypeInvalid), m_string() {
  va_list args;
  va_start(args, format);
  SetErrorToGenericError();
  SetErrorStringWithVarArg(format, args);
  va_end(args);
}

Status::Status(llvm::Error error)
    : m_code(0), m_type(ErrorType::eErrorTypeGeneric) {
  if (!error)
    return;

  // if the error happens to be a errno error, preserve the error code
  error = llvm::handleErrors(
      std::move(error), [&](std::unique_ptr<llvm::ECError> e) -> llvm::Error {
        std::error_code ec = e->convertToErrorCode();
        if (ec.category() == std::generic_category()) {
          m_code = ec.value();
          m_type = ErrorType::eErrorTypePOSIX;
          return llvm::Error::success();
        }
        return llvm::Error(std::move(e));
      });

  // Otherwise, just preserve the message
  if (error)
    SetErrorString(llvm::toString(std::move(error)));
}

llvm::Error Status::ToError() const {
  if (Success())
    return llvm::Error::success();
  if (m_type == ErrorType::eErrorTypePOSIX)
    return llvm::errorCodeToError(std::error_code(m_code, std::generic_category()));
  return llvm::make_error<llvm::StringError>(AsCString(),
                                             llvm::inconvertibleErrorCode());
}

//----------------------------------------------------------------------
// Assignment operator
//----------------------------------------------------------------------
const Status &Status::operator=(const Status &rhs) {
  if (this != &rhs) {
    m_code = rhs.m_code;
    m_type = rhs.m_type;
    m_string = rhs.m_string;
  }
  return *this;
}

//----------------------------------------------------------------------
// Assignment operator
//----------------------------------------------------------------------
const Status &Status::operator=(uint32_t err) {
  m_code = err;
  m_type = eErrorTypeMachKernel;
  m_string.clear();
  return *this;
}

Status::~Status() = default;

//----------------------------------------------------------------------
// Get the error value as a NULL C string. The error string will be
// fetched and cached on demand. The cached error string value will
// remain until the error value is changed or cleared.
//----------------------------------------------------------------------
const char *Status::AsCString(const char *default_error_str) const {
  if (Success())
    return nullptr;

  if (m_string.empty()) {
    const char *s = nullptr;
    switch (m_type) {
    case eErrorTypeMachKernel:
#if defined(__APPLE__)
      s = ::mach_error_string(m_code);
#endif
      break;

    case eErrorTypePOSIX:
      s = ::strerror(m_code);
      break;

    default:
      break;
    }
    if (s != nullptr)
      m_string.assign(s);
  }
  if (m_string.empty()) {
    if (default_error_str)
      m_string.assign(default_error_str);
    else
      return nullptr; // User wanted a nullptr string back...
  }
  return m_string.c_str();
}

//----------------------------------------------------------------------
// Clear the error and any cached error string that it might contain.
//----------------------------------------------------------------------
void Status::Clear() {
  m_code = 0;
  m_type = eErrorTypeInvalid;
  m_string.clear();
}

//----------------------------------------------------------------------
// Access the error value.
//----------------------------------------------------------------------
Status::ValueType Status::GetError() const { return m_code; }

//----------------------------------------------------------------------
// Access the error type.
//----------------------------------------------------------------------
ErrorType Status::GetType() const { return m_type; }

//----------------------------------------------------------------------
// Returns true if this object contains a value that describes an
// error or otherwise non-success result.
//----------------------------------------------------------------------
bool Status::Fail() const { return m_code != 0; }

//----------------------------------------------------------------------
// Set accesssor for the error value to "err" and the type to
// "eErrorTypeMachKernel"
//----------------------------------------------------------------------
void Status::SetMachError(uint32_t err) {
  m_code = err;
  m_type = eErrorTypeMachKernel;
  m_string.clear();
}

void Status::SetExpressionError(lldb::ExpressionResults result,
                                const char *mssg) {
  m_code = result;
  m_type = eErrorTypeExpression;
  m_string = mssg;
}

int Status::SetExpressionErrorWithFormat(lldb::ExpressionResults result,
                                         const char *format, ...) {
  int length = 0;

  if (format != nullptr && format[0]) {
    va_list args;
    va_start(args, format);
    length = SetErrorStringWithVarArg(format, args);
    va_end(args);
  } else {
    m_string.clear();
  }
  m_code = result;
  m_type = eErrorTypeExpression;
  return length;
}

//----------------------------------------------------------------------
// Set accesssor for the error value and type.
//----------------------------------------------------------------------
void Status::SetError(ValueType err, ErrorType type) {
  m_code = err;
  m_type = type;
  m_string.clear();
}

//----------------------------------------------------------------------
// Update the error value to be "errno" and update the type to
// be "POSIX".
//----------------------------------------------------------------------
void Status::SetErrorToErrno() {
  m_code = errno;
  m_type = eErrorTypePOSIX;
  m_string.clear();
}

//----------------------------------------------------------------------
// Update the error value to be LLDB_GENERIC_ERROR and update the type
// to be "Generic".
//----------------------------------------------------------------------
void Status::SetErrorToGenericError() {
  m_code = LLDB_GENERIC_ERROR;
  m_type = eErrorTypeGeneric;
  m_string.clear();
}

//----------------------------------------------------------------------
// Set accessor for the error string value for a specific error.
// This allows any string to be supplied as an error explanation.
// The error string value will remain until the error value is
// cleared or a new error value/type is assigned.
//----------------------------------------------------------------------
void Status::SetErrorString(llvm::StringRef err_str) {
  if (!err_str.empty()) {
    // If we have an error string, we should always at least have an error
    // set to a generic value.
    if (Success())
      SetErrorToGenericError();
  }
  m_string = err_str;
}

//------------------------------------------------------------------
/// Set the current error string to a formatted error string.
///
/// @param format
///     A printf style format string
//------------------------------------------------------------------
int Status::SetErrorStringWithFormat(const char *format, ...) {
  if (format != nullptr && format[0]) {
    va_list args;
    va_start(args, format);
    int length = SetErrorStringWithVarArg(format, args);
    va_end(args);
    return length;
  } else {
    m_string.clear();
  }
  return 0;
}

int Status::SetErrorStringWithVarArg(const char *format, va_list args) {
  if (format != nullptr && format[0]) {
    // If we have an error string, we should always at least have
    // an error set to a generic value.
    if (Success())
      SetErrorToGenericError();

    llvm::SmallString<1024> buf;
    VASprintf(buf, format, args);
    m_string = buf.str();
    return buf.size();
  } else {
    m_string.clear();
  }
  return 0;
}

//----------------------------------------------------------------------
// Returns true if the error code in this object is considered a
// successful return value.
//----------------------------------------------------------------------
bool Status::Success() const { return m_code == 0; }

bool Status::WasInterrupted() const {
  return (m_type == eErrorTypePOSIX && m_code == EINTR);
}

void llvm::format_provider<lldb_private::Status>::format(
    const lldb_private::Status &error, llvm::raw_ostream &OS,
    llvm::StringRef Options) {
  llvm::format_provider<llvm::StringRef>::format(error.AsCString(), OS,
                                                 Options);
}