llvm.org GIT mirror llvm / release_70 include / llvm / Support / FormatProviders.h
release_70

Tree @release_70 (Download .tar.gz)

FormatProviders.h @release_70raw · history · 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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
//===- FormatProviders.h - Formatters for common LLVM types -----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements format providers for many common LLVM types, for example
// allowing precision and width specifiers for scalar and string types.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_FORMATPROVIDERS_H
#define LLVM_SUPPORT_FORMATPROVIDERS_H

#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/FormatVariadicDetails.h"
#include "llvm/Support/NativeFormatting.h"

#include <type_traits>
#include <vector>

namespace llvm {
namespace detail {
template <typename T>
struct use_integral_formatter
    : public std::integral_constant<
          bool, is_one_of<T, uint8_t, int16_t, uint16_t, int32_t, uint32_t,
                          int64_t, uint64_t, int, unsigned, long, unsigned long,
                          long long, unsigned long long>::value> {};

template <typename T>
struct use_char_formatter
    : public std::integral_constant<bool, std::is_same<T, char>::value> {};

template <typename T>
struct is_cstring
    : public std::integral_constant<bool,
                                    is_one_of<T, char *, const char *>::value> {
};

template <typename T>
struct use_string_formatter
    : public std::integral_constant<bool,
                                    std::is_convertible<T, llvm::StringRef>::value> {};

template <typename T>
struct use_pointer_formatter
    : public std::integral_constant<bool, std::is_pointer<T>::value &&
                                              !is_cstring<T>::value> {};

template <typename T>
struct use_double_formatter
    : public std::integral_constant<bool, std::is_floating_point<T>::value> {};

class HelperFunctions {
protected:
  static Optional<size_t> parseNumericPrecision(StringRef Str) {
    size_t Prec;
    Optional<size_t> Result;
    if (Str.empty())
      Result = None;
    else if (Str.getAsInteger(10, Prec)) {
      assert(false && "Invalid precision specifier");
      Result = None;
    } else {
      assert(Prec < 100 && "Precision out of range");
      Result = std::min<size_t>(99u, Prec);
    }
    return Result;
  }

  static bool consumeHexStyle(StringRef &Str, HexPrintStyle &Style) {
    if (!Str.startswith_lower("x"))
      return false;

    if (Str.consume_front("x-"))
      Style = HexPrintStyle::Lower;
    else if (Str.consume_front("X-"))
      Style = HexPrintStyle::Upper;
    else if (Str.consume_front("x+") || Str.consume_front("x"))
      Style = HexPrintStyle::PrefixLower;
    else if (Str.consume_front("X+") || Str.consume_front("X"))
      Style = HexPrintStyle::PrefixUpper;
    return true;
  }

  static size_t consumeNumHexDigits(StringRef &Str, HexPrintStyle Style,
                                    size_t Default) {
    Str.consumeInteger(10, Default);
    if (isPrefixedHexStyle(Style))
      Default += 2;
    return Default;
  }
};
}

/// Implementation of format_provider<T> for integral arithmetic types.
///
/// The options string of an integral type has the grammar:
///
///   integer_options   :: [style][digits]
///   style             :: <see table below>
///   digits            :: <non-negative integer> 0-99
///
///   ==========================================================================
///   |  style  |     Meaning          |      Example     | Digits Meaning     |
///   --------------------------------------------------------------------------
///   |         |                      |  Input |  Output |                    |
///   ==========================================================================
///   |   x-    | Hex no prefix, lower |   42   |    2a   | Minimum # digits   |
///   |   X-    | Hex no prefix, upper |   42   |    2A   | Minimum # digits   |
///   | x+ / x  | Hex + prefix, lower  |   42   |   0x2a  | Minimum # digits   |
///   | X+ / X  | Hex + prefix, upper  |   42   |   0x2A  | Minimum # digits   |
///   | N / n   | Digit grouped number | 123456 | 123,456 | Ignored            |
///   | D / d   | Integer              | 100000 | 100000  | Ignored            |
///   | (empty) | Same as D / d        |        |         |                    |
///   ==========================================================================
///

template <typename T>
struct format_provider<
    T, typename std::enable_if<detail::use_integral_formatter<T>::value>::type>
    : public detail::HelperFunctions {
private:
public:
  static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
    HexPrintStyle HS;
    size_t Digits = 0;
    if (consumeHexStyle(Style, HS)) {
      Digits = consumeNumHexDigits(Style, HS, 0);
      write_hex(Stream, V, HS, Digits);
      return;
    }

    IntegerStyle IS = IntegerStyle::Integer;
    if (Style.consume_front("N") || Style.consume_front("n"))
      IS = IntegerStyle::Number;
    else if (Style.consume_front("D") || Style.consume_front("d"))
      IS = IntegerStyle::Integer;

    Style.consumeInteger(10, Digits);
    assert(Style.empty() && "Invalid integral format style!");
    write_integer(Stream, V, Digits, IS);
  }
};

/// Implementation of format_provider<T> for integral pointer types.
///
/// The options string of a pointer type has the grammar:
///
///   pointer_options   :: [style][precision]
///   style             :: <see table below>
///   digits            :: <non-negative integer> 0-sizeof(void*)
///
///   ==========================================================================
///   |   S     |     Meaning          |                Example                |
///   --------------------------------------------------------------------------
///   |         |                      |       Input       |      Output       |
///   ==========================================================================
///   |   x-    | Hex no prefix, lower |    0xDEADBEEF     |     deadbeef      |
///   |   X-    | Hex no prefix, upper |    0xDEADBEEF     |     DEADBEEF      |
///   | x+ / x  | Hex + prefix, lower  |    0xDEADBEEF     |    0xdeadbeef     |
///   | X+ / X  | Hex + prefix, upper  |    0xDEADBEEF     |    0xDEADBEEF     |
///   | (empty) | Same as X+ / X       |                   |                   |
///   ==========================================================================
///
/// The default precision is the number of nibbles in a machine word, and in all
/// cases indicates the minimum number of nibbles to print.
template <typename T>
struct format_provider<
    T, typename std::enable_if<detail::use_pointer_formatter<T>::value>::type>
    : public detail::HelperFunctions {
private:
public:
  static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
    HexPrintStyle HS = HexPrintStyle::PrefixUpper;
    consumeHexStyle(Style, HS);
    size_t Digits = consumeNumHexDigits(Style, HS, sizeof(void *) * 2);
    write_hex(Stream, reinterpret_cast<std::uintptr_t>(V), HS, Digits);
  }
};

/// Implementation of format_provider<T> for c-style strings and string
/// objects such as std::string and llvm::StringRef.
///
/// The options string of a string type has the grammar:
///
///   string_options :: [length]
///
/// where `length` is an optional integer specifying the maximum number of
/// characters in the string to print.  If `length` is omitted, the string is
/// printed up to the null terminator.

template <typename T>
struct format_provider<
    T, typename std::enable_if<detail::use_string_formatter<T>::value>::type> {
  static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
    size_t N = StringRef::npos;
    if (!Style.empty() && Style.getAsInteger(10, N)) {
      assert(false && "Style is not a valid integer");
    }
    llvm::StringRef S = V;
    Stream << S.substr(0, N);
  }
};

/// Implementation of format_provider<T> for llvm::Twine.
///
/// This follows the same rules as the string formatter.

template <> struct format_provider<Twine> {
  static void format(const Twine &V, llvm::raw_ostream &Stream,
                     StringRef Style) {
    format_provider<std::string>::format(V.str(), Stream, Style);
  }
};

/// Implementation of format_provider<T> for characters.
///
/// The options string of a character type has the grammar:
///
///   char_options :: (empty) | [integer_options]
///
/// If `char_options` is empty, the character is displayed as an ASCII
/// character.  Otherwise, it is treated as an integer options string.
///
template <typename T>
struct format_provider<
    T, typename std::enable_if<detail::use_char_formatter<T>::value>::type> {
  static void format(const char &V, llvm::raw_ostream &Stream,
                     StringRef Style) {
    if (Style.empty())
      Stream << V;
    else {
      int X = static_cast<int>(V);
      format_provider<int>::format(X, Stream, Style);
    }
  }
};

/// Implementation of format_provider<T> for type `bool`
///
/// The options string of a boolean type has the grammar:
///
///   bool_options :: "" | "Y" | "y" | "D" | "d" | "T" | "t"
///
///   ==================================
///   |    C    |     Meaning          |
///   ==================================
///   |    Y    |       YES / NO       |
///   |    y    |       yes / no       |
///   |  D / d  |    Integer 0 or 1    |
///   |    T    |     TRUE / FALSE     |
///   |    t    |     true / false     |
///   | (empty) |   Equivalent to 't'  |
///   ==================================
template <> struct format_provider<bool> {
  static void format(const bool &B, llvm::raw_ostream &Stream,
                     StringRef Style) {
    Stream << StringSwitch<const char *>(Style)
                  .Case("Y", B ? "YES" : "NO")
                  .Case("y", B ? "yes" : "no")
                  .CaseLower("D", B ? "1" : "0")
                  .Case("T", B ? "TRUE" : "FALSE")
                  .Cases("t", "", B ? "true" : "false")
                  .Default(B ? "1" : "0");
  }
};

/// Implementation of format_provider<T> for floating point types.
///
/// The options string of a floating point type has the format:
///
///   float_options   :: [style][precision]
///   style           :: <see table below>
///   precision       :: <non-negative integer> 0-99
///
///   =====================================================
///   |  style  |     Meaning          |      Example     |
///   -----------------------------------------------------
///   |         |                      |  Input |  Output |
///   =====================================================
///   | P / p   | Percentage           |  0.05  |  5.00%  |
///   | F / f   | Fixed point          |   1.0  |  1.00   |
///   |   E     | Exponential with E   | 100000 | 1.0E+05 |
///   |   e     | Exponential with e   | 100000 | 1.0e+05 |
///   | (empty) | Same as F / f        |        |         |
///   =====================================================
///
/// The default precision is 6 for exponential (E / e) and 2 for everything
/// else.

template <typename T>
struct format_provider<
    T, typename std::enable_if<detail::use_double_formatter<T>::value>::type>
    : public detail::HelperFunctions {
  static void format(const T &V, llvm::raw_ostream &Stream, StringRef Style) {
    FloatStyle S;
    if (Style.consume_front("P") || Style.consume_front("p"))
      S = FloatStyle::Percent;
    else if (Style.consume_front("F") || Style.consume_front("f"))
      S = FloatStyle::Fixed;
    else if (Style.consume_front("E"))
      S = FloatStyle::ExponentUpper;
    else if (Style.consume_front("e"))
      S = FloatStyle::Exponent;
    else
      S = FloatStyle::Fixed;

    Optional<size_t> Precision = parseNumericPrecision(Style);
    if (!Precision.hasValue())
      Precision = getDefaultPrecision(S);

    write_double(Stream, static_cast<double>(V), S, Precision);
  }
};

namespace detail {
template <typename IterT>
using IterValue = typename std::iterator_traits<IterT>::value_type;

template <typename IterT>
struct range_item_has_provider
    : public std::integral_constant<
          bool, !uses_missing_provider<IterValue<IterT>>::value> {};
}

/// Implementation of format_provider<T> for ranges.
///
/// This will print an arbitrary range as a delimited sequence of items.
///
/// The options string of a range type has the grammar:
///
///   range_style       ::= [separator] [element_style]
///   separator         ::= "$" delimeted_expr
///   element_style     ::= "@" delimeted_expr
///   delimeted_expr    ::= "[" expr "]" | "(" expr ")" | "<" expr ">"
///   expr              ::= <any string not containing delimeter>
///
/// where the separator expression is the string to insert between consecutive
/// items in the range and the argument expression is the Style specification to
/// be used when formatting the underlying type.  The default separator if
/// unspecified is ' ' (space).  The syntax of the argument expression follows
/// whatever grammar is dictated by the format provider or format adapter used
/// to format the value type.
///
/// Note that attempting to format an `iterator_range<T>` where no format
/// provider can be found for T will result in a compile error.
///

template <typename IterT> class format_provider<llvm::iterator_range<IterT>> {
  using value = typename std::iterator_traits<IterT>::value_type;
  using reference = typename std::iterator_traits<IterT>::reference;

  static StringRef consumeOneOption(StringRef &Style, char Indicator,
                                    StringRef Default) {
    if (Style.empty())
      return Default;
    if (Style.front() != Indicator)
      return Default;
    Style = Style.drop_front();
    if (Style.empty()) {
      assert(false && "Invalid range style");
      return Default;
    }

    for (const char *D : {"[]", "<>", "()"}) {
      if (Style.front() != D[0])
        continue;
      size_t End = Style.find_first_of(D[1]);
      if (End == StringRef::npos) {
        assert(false && "Missing range option end delimeter!");
        return Default;
      }
      StringRef Result = Style.slice(1, End);
      Style = Style.drop_front(End + 1);
      return Result;
    }
    assert(false && "Invalid range style!");
    return Default;
  }

  static std::pair<StringRef, StringRef> parseOptions(StringRef Style) {
    StringRef Sep = consumeOneOption(Style, '$', ", ");
    StringRef Args = consumeOneOption(Style, '@', "");
    assert(Style.empty() && "Unexpected text in range option string!");
    return std::make_pair(Sep, Args);
  }

public:
  static_assert(detail::range_item_has_provider<IterT>::value,
                "Range value_type does not have a format provider!");
  static void format(const llvm::iterator_range<IterT> &V,
                     llvm::raw_ostream &Stream, StringRef Style) {
    StringRef Sep;
    StringRef ArgStyle;
    std::tie(Sep, ArgStyle) = parseOptions(Style);
    auto Begin = V.begin();
    auto End = V.end();
    if (Begin != End) {
      auto Adapter =
          detail::build_format_adapter(std::forward<reference>(*Begin));
      Adapter.format(Stream, ArgStyle);
      ++Begin;
    }
    while (Begin != End) {
      Stream << Sep;
      auto Adapter =
          detail::build_format_adapter(std::forward<reference>(*Begin));
      Adapter.format(Stream, ArgStyle);
      ++Begin;
    }
  }
};
}

#endif