clang  15.0.0git
TextDiagnostic.cpp
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1 //===--- TextDiagnostic.cpp - Text Diagnostic Pretty-Printing -------------===//
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 
10 #include "clang/Basic/CharInfo.h"
14 #include "clang/Lex/Lexer.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/Support/ConvertUTF.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/Locale.h"
20 #include "llvm/Support/Path.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include <algorithm>
23 
24 using namespace clang;
25 
26 static const enum raw_ostream::Colors noteColor =
27  raw_ostream::BLACK;
28 static const enum raw_ostream::Colors remarkColor =
29  raw_ostream::BLUE;
30 static const enum raw_ostream::Colors fixitColor =
31  raw_ostream::GREEN;
32 static const enum raw_ostream::Colors caretColor =
33  raw_ostream::GREEN;
34 static const enum raw_ostream::Colors warningColor =
35  raw_ostream::MAGENTA;
36 static const enum raw_ostream::Colors templateColor =
37  raw_ostream::CYAN;
38 static const enum raw_ostream::Colors errorColor = raw_ostream::RED;
39 static const enum raw_ostream::Colors fatalColor = raw_ostream::RED;
40 // Used for changing only the bold attribute.
41 static const enum raw_ostream::Colors savedColor =
42  raw_ostream::SAVEDCOLOR;
43 
44 /// Add highlights to differences in template strings.
45 static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str,
46  bool &Normal, bool Bold) {
47  while (true) {
48  size_t Pos = Str.find(ToggleHighlight);
49  OS << Str.slice(0, Pos);
50  if (Pos == StringRef::npos)
51  break;
52 
53  Str = Str.substr(Pos + 1);
54  if (Normal)
55  OS.changeColor(templateColor, true);
56  else {
57  OS.resetColor();
58  if (Bold)
59  OS.changeColor(savedColor, true);
60  }
61  Normal = !Normal;
62  }
63 }
64 
65 /// Number of spaces to indent when word-wrapping.
66 const unsigned WordWrapIndentation = 6;
67 
68 static int bytesSincePreviousTabOrLineBegin(StringRef SourceLine, size_t i) {
69  int bytes = 0;
70  while (0<i) {
71  if (SourceLine[--i]=='\t')
72  break;
73  ++bytes;
74  }
75  return bytes;
76 }
77 
78 /// returns a printable representation of first item from input range
79 ///
80 /// This function returns a printable representation of the next item in a line
81 /// of source. If the next byte begins a valid and printable character, that
82 /// character is returned along with 'true'.
83 ///
84 /// Otherwise, if the next byte begins a valid, but unprintable character, a
85 /// printable, escaped representation of the character is returned, along with
86 /// 'false'. Otherwise a printable, escaped representation of the next byte
87 /// is returned along with 'false'.
88 ///
89 /// \note The index is updated to be used with a subsequent call to
90 /// printableTextForNextCharacter.
91 ///
92 /// \param SourceLine The line of source
93 /// \param i Pointer to byte index,
94 /// \param TabStop used to expand tabs
95 /// \return pair(printable text, 'true' iff original text was printable)
96 ///
97 static std::pair<SmallString<16>, bool>
98 printableTextForNextCharacter(StringRef SourceLine, size_t *i,
99  unsigned TabStop) {
100  assert(i && "i must not be null");
101  assert(*i<SourceLine.size() && "must point to a valid index");
102 
103  if (SourceLine[*i]=='\t') {
104  assert(0 < TabStop && TabStop <= DiagnosticOptions::MaxTabStop &&
105  "Invalid -ftabstop value");
106  unsigned col = bytesSincePreviousTabOrLineBegin(SourceLine, *i);
107  unsigned NumSpaces = TabStop - col%TabStop;
108  assert(0 < NumSpaces && NumSpaces <= TabStop
109  && "Invalid computation of space amt");
110  ++(*i);
111 
112  SmallString<16> expandedTab;
113  expandedTab.assign(NumSpaces, ' ');
114  return std::make_pair(expandedTab, true);
115  }
116 
117  unsigned char const *begin, *end;
118  begin = reinterpret_cast<unsigned char const *>(&*(SourceLine.begin() + *i));
119  end = begin + (SourceLine.size() - *i);
120 
121  if (llvm::isLegalUTF8Sequence(begin, end)) {
122  llvm::UTF32 c;
123  llvm::UTF32 *cptr = &c;
124  unsigned char const *original_begin = begin;
125  unsigned char const *cp_end =
126  begin + llvm::getNumBytesForUTF8(SourceLine[*i]);
127 
128  llvm::ConversionResult res = llvm::ConvertUTF8toUTF32(
129  &begin, cp_end, &cptr, cptr + 1, llvm::strictConversion);
130  (void)res;
131  assert(llvm::conversionOK == res);
132  assert(0 < begin-original_begin
133  && "we must be further along in the string now");
134  *i += begin-original_begin;
135 
136  if (!llvm::sys::locale::isPrint(c)) {
137  // If next character is valid UTF-8, but not printable
138  SmallString<16> expandedCP("<U+>");
139  while (c) {
140  expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(c%16));
141  c/=16;
142  }
143  while (expandedCP.size() < 8)
144  expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(0));
145  return std::make_pair(expandedCP, false);
146  }
147 
148  // If next character is valid UTF-8, and printable
149  return std::make_pair(SmallString<16>(original_begin, cp_end), true);
150 
151  }
152 
153  // If next byte is not valid UTF-8 (and therefore not printable)
154  SmallString<16> expandedByte("<XX>");
155  unsigned char byte = SourceLine[*i];
156  expandedByte[1] = llvm::hexdigit(byte / 16);
157  expandedByte[2] = llvm::hexdigit(byte % 16);
158  ++(*i);
159  return std::make_pair(expandedByte, false);
160 }
161 
162 static void expandTabs(std::string &SourceLine, unsigned TabStop) {
163  size_t i = SourceLine.size();
164  while (i>0) {
165  i--;
166  if (SourceLine[i]!='\t')
167  continue;
168  size_t tmp_i = i;
169  std::pair<SmallString<16>,bool> res
170  = printableTextForNextCharacter(SourceLine, &tmp_i, TabStop);
171  SourceLine.replace(i, 1, res.first.c_str());
172  }
173 }
174 
175 /// This function takes a raw source line and produces a mapping from the bytes
176 /// of the printable representation of the line to the columns those printable
177 /// characters will appear at (numbering the first column as 0).
178 ///
179 /// If a byte 'i' corresponds to multiple columns (e.g. the byte contains a tab
180 /// character) then the array will map that byte to the first column the
181 /// tab appears at and the next value in the map will have been incremented
182 /// more than once.
183 ///
184 /// If a byte is the first in a sequence of bytes that together map to a single
185 /// entity in the output, then the array will map that byte to the appropriate
186 /// column while the subsequent bytes will be -1.
187 ///
188 /// The last element in the array does not correspond to any byte in the input
189 /// and instead is the number of columns needed to display the source
190 ///
191 /// example: (given a tabstop of 8)
192 ///
193 /// "a \t \u3042" -> {0,1,2,8,9,-1,-1,11}
194 ///
195 /// (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
196 /// display)
197 static void byteToColumn(StringRef SourceLine, unsigned TabStop,
198  SmallVectorImpl<int> &out) {
199  out.clear();
200 
201  if (SourceLine.empty()) {
202  out.resize(1u,0);
203  return;
204  }
205 
206  out.resize(SourceLine.size()+1, -1);
207 
208  int columns = 0;
209  size_t i = 0;
210  while (i<SourceLine.size()) {
211  out[i] = columns;
212  std::pair<SmallString<16>,bool> res
213  = printableTextForNextCharacter(SourceLine, &i, TabStop);
214  columns += llvm::sys::locale::columnWidth(res.first);
215  }
216  out.back() = columns;
217 }
218 
219 /// This function takes a raw source line and produces a mapping from columns
220 /// to the byte of the source line that produced the character displaying at
221 /// that column. This is the inverse of the mapping produced by byteToColumn()
222 ///
223 /// The last element in the array is the number of bytes in the source string
224 ///
225 /// example: (given a tabstop of 8)
226 ///
227 /// "a \t \u3042" -> {0,1,2,-1,-1,-1,-1,-1,3,4,-1,7}
228 ///
229 /// (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
230 /// display)
231 static void columnToByte(StringRef SourceLine, unsigned TabStop,
232  SmallVectorImpl<int> &out) {
233  out.clear();
234 
235  if (SourceLine.empty()) {
236  out.resize(1u, 0);
237  return;
238  }
239 
240  int columns = 0;
241  size_t i = 0;
242  while (i<SourceLine.size()) {
243  out.resize(columns+1, -1);
244  out.back() = i;
245  std::pair<SmallString<16>,bool> res
246  = printableTextForNextCharacter(SourceLine, &i, TabStop);
247  columns += llvm::sys::locale::columnWidth(res.first);
248  }
249  out.resize(columns+1, -1);
250  out.back() = i;
251 }
252 
253 namespace {
254 struct SourceColumnMap {
255  SourceColumnMap(StringRef SourceLine, unsigned TabStop)
256  : m_SourceLine(SourceLine) {
257 
258  ::byteToColumn(SourceLine, TabStop, m_byteToColumn);
259  ::columnToByte(SourceLine, TabStop, m_columnToByte);
260 
261  assert(m_byteToColumn.size()==SourceLine.size()+1);
262  assert(0 < m_byteToColumn.size() && 0 < m_columnToByte.size());
263  assert(m_byteToColumn.size()
264  == static_cast<unsigned>(m_columnToByte.back()+1));
265  assert(static_cast<unsigned>(m_byteToColumn.back()+1)
266  == m_columnToByte.size());
267  }
268  int columns() const { return m_byteToColumn.back(); }
269  int bytes() const { return m_columnToByte.back(); }
270 
271  /// Map a byte to the column which it is at the start of, or return -1
272  /// if it is not at the start of a column (for a UTF-8 trailing byte).
273  int byteToColumn(int n) const {
274  assert(0<=n && n<static_cast<int>(m_byteToColumn.size()));
275  return m_byteToColumn[n];
276  }
277 
278  /// Map a byte to the first column which contains it.
279  int byteToContainingColumn(int N) const {
280  assert(0 <= N && N < static_cast<int>(m_byteToColumn.size()));
281  while (m_byteToColumn[N] == -1)
282  --N;
283  return m_byteToColumn[N];
284  }
285 
286  /// Map a column to the byte which starts the column, or return -1 if
287  /// the column the second or subsequent column of an expanded tab or similar
288  /// multi-column entity.
289  int columnToByte(int n) const {
290  assert(0<=n && n<static_cast<int>(m_columnToByte.size()));
291  return m_columnToByte[n];
292  }
293 
294  /// Map from a byte index to the next byte which starts a column.
295  int startOfNextColumn(int N) const {
296  assert(0 <= N && N < static_cast<int>(m_byteToColumn.size() - 1));
297  while (byteToColumn(++N) == -1) {}
298  return N;
299  }
300 
301  /// Map from a byte index to the previous byte which starts a column.
302  int startOfPreviousColumn(int N) const {
303  assert(0 < N && N < static_cast<int>(m_byteToColumn.size()));
304  while (byteToColumn(--N) == -1) {}
305  return N;
306  }
307 
308  StringRef getSourceLine() const {
309  return m_SourceLine;
310  }
311 
312 private:
313  const std::string m_SourceLine;
314  SmallVector<int,200> m_byteToColumn;
315  SmallVector<int,200> m_columnToByte;
316 };
317 } // end anonymous namespace
318 
319 /// When the source code line we want to print is too long for
320 /// the terminal, select the "interesting" region.
322  std::string &CaretLine,
323  std::string &FixItInsertionLine,
324  unsigned Columns,
325  const SourceColumnMap &map) {
326  unsigned CaretColumns = CaretLine.size();
327  unsigned FixItColumns = llvm::sys::locale::columnWidth(FixItInsertionLine);
328  unsigned MaxColumns = std::max(static_cast<unsigned>(map.columns()),
329  std::max(CaretColumns, FixItColumns));
330  // if the number of columns is less than the desired number we're done
331  if (MaxColumns <= Columns)
332  return;
333 
334  // No special characters are allowed in CaretLine.
335  assert(CaretLine.end() ==
336  llvm::find_if(CaretLine, [](char c) { return c < ' ' || '~' < c; }));
337 
338  // Find the slice that we need to display the full caret line
339  // correctly.
340  unsigned CaretStart = 0, CaretEnd = CaretLine.size();
341  for (; CaretStart != CaretEnd; ++CaretStart)
342  if (!isWhitespace(CaretLine[CaretStart]))
343  break;
344 
345  for (; CaretEnd != CaretStart; --CaretEnd)
346  if (!isWhitespace(CaretLine[CaretEnd - 1]))
347  break;
348 
349  // caret has already been inserted into CaretLine so the above whitespace
350  // check is guaranteed to include the caret
351 
352  // If we have a fix-it line, make sure the slice includes all of the
353  // fix-it information.
354  if (!FixItInsertionLine.empty()) {
355  unsigned FixItStart = 0, FixItEnd = FixItInsertionLine.size();
356  for (; FixItStart != FixItEnd; ++FixItStart)
357  if (!isWhitespace(FixItInsertionLine[FixItStart]))
358  break;
359 
360  for (; FixItEnd != FixItStart; --FixItEnd)
361  if (!isWhitespace(FixItInsertionLine[FixItEnd - 1]))
362  break;
363 
364  // We can safely use the byte offset FixItStart as the column offset
365  // because the characters up until FixItStart are all ASCII whitespace
366  // characters.
367  unsigned FixItStartCol = FixItStart;
368  unsigned FixItEndCol
369  = llvm::sys::locale::columnWidth(FixItInsertionLine.substr(0, FixItEnd));
370 
371  CaretStart = std::min(FixItStartCol, CaretStart);
372  CaretEnd = std::max(FixItEndCol, CaretEnd);
373  }
374 
375  // CaretEnd may have been set at the middle of a character
376  // If it's not at a character's first column then advance it past the current
377  // character.
378  while (static_cast<int>(CaretEnd) < map.columns() &&
379  -1 == map.columnToByte(CaretEnd))
380  ++CaretEnd;
381 
382  assert((static_cast<int>(CaretStart) > map.columns() ||
383  -1!=map.columnToByte(CaretStart)) &&
384  "CaretStart must not point to a column in the middle of a source"
385  " line character");
386  assert((static_cast<int>(CaretEnd) > map.columns() ||
387  -1!=map.columnToByte(CaretEnd)) &&
388  "CaretEnd must not point to a column in the middle of a source line"
389  " character");
390 
391  // CaretLine[CaretStart, CaretEnd) contains all of the interesting
392  // parts of the caret line. While this slice is smaller than the
393  // number of columns we have, try to grow the slice to encompass
394  // more context.
395 
396  unsigned SourceStart = map.columnToByte(std::min<unsigned>(CaretStart,
397  map.columns()));
398  unsigned SourceEnd = map.columnToByte(std::min<unsigned>(CaretEnd,
399  map.columns()));
400 
401  unsigned CaretColumnsOutsideSource = CaretEnd-CaretStart
402  - (map.byteToColumn(SourceEnd)-map.byteToColumn(SourceStart));
403 
404  char const *front_ellipse = " ...";
405  char const *front_space = " ";
406  char const *back_ellipse = "...";
407  unsigned ellipses_space = strlen(front_ellipse) + strlen(back_ellipse);
408 
409  unsigned TargetColumns = Columns;
410  // Give us extra room for the ellipses
411  // and any of the caret line that extends past the source
412  if (TargetColumns > ellipses_space+CaretColumnsOutsideSource)
413  TargetColumns -= ellipses_space+CaretColumnsOutsideSource;
414 
415  while (SourceStart>0 || SourceEnd<SourceLine.size()) {
416  bool ExpandedRegion = false;
417 
418  if (SourceStart>0) {
419  unsigned NewStart = map.startOfPreviousColumn(SourceStart);
420 
421  // Skip over any whitespace we see here; we're looking for
422  // another bit of interesting text.
423  // FIXME: Detect non-ASCII whitespace characters too.
424  while (NewStart && isWhitespace(SourceLine[NewStart]))
425  NewStart = map.startOfPreviousColumn(NewStart);
426 
427  // Skip over this bit of "interesting" text.
428  while (NewStart) {
429  unsigned Prev = map.startOfPreviousColumn(NewStart);
430  if (isWhitespace(SourceLine[Prev]))
431  break;
432  NewStart = Prev;
433  }
434 
435  assert(map.byteToColumn(NewStart) != -1);
436  unsigned NewColumns = map.byteToColumn(SourceEnd) -
437  map.byteToColumn(NewStart);
438  if (NewColumns <= TargetColumns) {
439  SourceStart = NewStart;
440  ExpandedRegion = true;
441  }
442  }
443 
444  if (SourceEnd<SourceLine.size()) {
445  unsigned NewEnd = map.startOfNextColumn(SourceEnd);
446 
447  // Skip over any whitespace we see here; we're looking for
448  // another bit of interesting text.
449  // FIXME: Detect non-ASCII whitespace characters too.
450  while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
451  NewEnd = map.startOfNextColumn(NewEnd);
452 
453  // Skip over this bit of "interesting" text.
454  while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
455  NewEnd = map.startOfNextColumn(NewEnd);
456 
457  assert(map.byteToColumn(NewEnd) != -1);
458  unsigned NewColumns = map.byteToColumn(NewEnd) -
459  map.byteToColumn(SourceStart);
460  if (NewColumns <= TargetColumns) {
461  SourceEnd = NewEnd;
462  ExpandedRegion = true;
463  }
464  }
465 
466  if (!ExpandedRegion)
467  break;
468  }
469 
470  CaretStart = map.byteToColumn(SourceStart);
471  CaretEnd = map.byteToColumn(SourceEnd) + CaretColumnsOutsideSource;
472 
473  // [CaretStart, CaretEnd) is the slice we want. Update the various
474  // output lines to show only this slice, with two-space padding
475  // before the lines so that it looks nicer.
476 
477  assert(CaretStart!=(unsigned)-1 && CaretEnd!=(unsigned)-1 &&
478  SourceStart!=(unsigned)-1 && SourceEnd!=(unsigned)-1);
479  assert(SourceStart <= SourceEnd);
480  assert(CaretStart <= CaretEnd);
481 
482  unsigned BackColumnsRemoved
483  = map.byteToColumn(SourceLine.size())-map.byteToColumn(SourceEnd);
484  unsigned FrontColumnsRemoved = CaretStart;
485  unsigned ColumnsKept = CaretEnd-CaretStart;
486 
487  // We checked up front that the line needed truncation
488  assert(FrontColumnsRemoved+ColumnsKept+BackColumnsRemoved > Columns);
489 
490  // The line needs some truncation, and we'd prefer to keep the front
491  // if possible, so remove the back
492  if (BackColumnsRemoved > strlen(back_ellipse))
493  SourceLine.replace(SourceEnd, std::string::npos, back_ellipse);
494 
495  // If that's enough then we're done
496  if (FrontColumnsRemoved+ColumnsKept <= Columns)
497  return;
498 
499  // Otherwise remove the front as well
500  if (FrontColumnsRemoved > strlen(front_ellipse)) {
501  SourceLine.replace(0, SourceStart, front_ellipse);
502  CaretLine.replace(0, CaretStart, front_space);
503  if (!FixItInsertionLine.empty())
504  FixItInsertionLine.replace(0, CaretStart, front_space);
505  }
506 }
507 
508 /// Skip over whitespace in the string, starting at the given
509 /// index.
510 ///
511 /// \returns The index of the first non-whitespace character that is
512 /// greater than or equal to Idx or, if no such character exists,
513 /// returns the end of the string.
514 static unsigned skipWhitespace(unsigned Idx, StringRef Str, unsigned Length) {
515  while (Idx < Length && isWhitespace(Str[Idx]))
516  ++Idx;
517  return Idx;
518 }
519 
520 /// If the given character is the start of some kind of
521 /// balanced punctuation (e.g., quotes or parentheses), return the
522 /// character that will terminate the punctuation.
523 ///
524 /// \returns The ending punctuation character, if any, or the NULL
525 /// character if the input character does not start any punctuation.
526 static inline char findMatchingPunctuation(char c) {
527  switch (c) {
528  case '\'': return '\'';
529  case '`': return '\'';
530  case '"': return '"';
531  case '(': return ')';
532  case '[': return ']';
533  case '{': return '}';
534  default: break;
535  }
536 
537  return 0;
538 }
539 
540 /// Find the end of the word starting at the given offset
541 /// within a string.
542 ///
543 /// \returns the index pointing one character past the end of the
544 /// word.
545 static unsigned findEndOfWord(unsigned Start, StringRef Str,
546  unsigned Length, unsigned Column,
547  unsigned Columns) {
548  assert(Start < Str.size() && "Invalid start position!");
549  unsigned End = Start + 1;
550 
551  // If we are already at the end of the string, take that as the word.
552  if (End == Str.size())
553  return End;
554 
555  // Determine if the start of the string is actually opening
556  // punctuation, e.g., a quote or parentheses.
557  char EndPunct = findMatchingPunctuation(Str[Start]);
558  if (!EndPunct) {
559  // This is a normal word. Just find the first space character.
560  while (End < Length && !isWhitespace(Str[End]))
561  ++End;
562  return End;
563  }
564 
565  // We have the start of a balanced punctuation sequence (quotes,
566  // parentheses, etc.). Determine the full sequence is.
567  SmallString<16> PunctuationEndStack;
568  PunctuationEndStack.push_back(EndPunct);
569  while (End < Length && !PunctuationEndStack.empty()) {
570  if (Str[End] == PunctuationEndStack.back())
571  PunctuationEndStack.pop_back();
572  else if (char SubEndPunct = findMatchingPunctuation(Str[End]))
573  PunctuationEndStack.push_back(SubEndPunct);
574 
575  ++End;
576  }
577 
578  // Find the first space character after the punctuation ended.
579  while (End < Length && !isWhitespace(Str[End]))
580  ++End;
581 
582  unsigned PunctWordLength = End - Start;
583  if (// If the word fits on this line
584  Column + PunctWordLength <= Columns ||
585  // ... or the word is "short enough" to take up the next line
586  // without too much ugly white space
587  PunctWordLength < Columns/3)
588  return End; // Take the whole thing as a single "word".
589 
590  // The whole quoted/parenthesized string is too long to print as a
591  // single "word". Instead, find the "word" that starts just after
592  // the punctuation and use that end-point instead. This will recurse
593  // until it finds something small enough to consider a word.
594  return findEndOfWord(Start + 1, Str, Length, Column + 1, Columns);
595 }
596 
597 /// Print the given string to a stream, word-wrapping it to
598 /// some number of columns in the process.
599 ///
600 /// \param OS the stream to which the word-wrapping string will be
601 /// emitted.
602 /// \param Str the string to word-wrap and output.
603 /// \param Columns the number of columns to word-wrap to.
604 /// \param Column the column number at which the first character of \p
605 /// Str will be printed. This will be non-zero when part of the first
606 /// line has already been printed.
607 /// \param Bold if the current text should be bold
608 /// \param Indentation the number of spaces to indent any lines beyond
609 /// the first line.
610 /// \returns true if word-wrapping was required, or false if the
611 /// string fit on the first line.
612 static bool printWordWrapped(raw_ostream &OS, StringRef Str,
613  unsigned Columns,
614  unsigned Column = 0,
615  bool Bold = false,
616  unsigned Indentation = WordWrapIndentation) {
617  const unsigned Length = std::min(Str.find('\n'), Str.size());
618  bool TextNormal = true;
619 
620  // The string used to indent each line.
621  SmallString<16> IndentStr;
622  IndentStr.assign(Indentation, ' ');
623  bool Wrapped = false;
624  for (unsigned WordStart = 0, WordEnd; WordStart < Length;
625  WordStart = WordEnd) {
626  // Find the beginning of the next word.
627  WordStart = skipWhitespace(WordStart, Str, Length);
628  if (WordStart == Length)
629  break;
630 
631  // Find the end of this word.
632  WordEnd = findEndOfWord(WordStart, Str, Length, Column, Columns);
633 
634  // Does this word fit on the current line?
635  unsigned WordLength = WordEnd - WordStart;
636  if (Column + WordLength < Columns) {
637  // This word fits on the current line; print it there.
638  if (WordStart) {
639  OS << ' ';
640  Column += 1;
641  }
642  applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
643  TextNormal, Bold);
644  Column += WordLength;
645  continue;
646  }
647 
648  // This word does not fit on the current line, so wrap to the next
649  // line.
650  OS << '\n';
651  OS.write(&IndentStr[0], Indentation);
652  applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
653  TextNormal, Bold);
654  Column = Indentation + WordLength;
655  Wrapped = true;
656  }
657 
658  // Append any remaning text from the message with its existing formatting.
659  applyTemplateHighlighting(OS, Str.substr(Length), TextNormal, Bold);
660 
661  assert(TextNormal && "Text highlighted at end of diagnostic message.");
662 
663  return Wrapped;
664 }
665 
667  const LangOptions &LangOpts,
668  DiagnosticOptions *DiagOpts)
669  : DiagnosticRenderer(LangOpts, DiagOpts), OS(OS) {}
670 
672 
675  StringRef Message, ArrayRef<clang::CharSourceRange> Ranges,
676  DiagOrStoredDiag D) {
677  uint64_t StartOfLocationInfo = OS.tell();
678 
679  // Emit the location of this particular diagnostic.
680  if (Loc.isValid())
681  emitDiagnosticLoc(Loc, PLoc, Level, Ranges);
682 
683  if (DiagOpts->ShowColors)
684  OS.resetColor();
685 
686  if (DiagOpts->ShowLevel)
687  printDiagnosticLevel(OS, Level, DiagOpts->ShowColors);
689  /*IsSupplemental*/ Level == DiagnosticsEngine::Note,
690  Message, OS.tell() - StartOfLocationInfo,
691  DiagOpts->MessageLength, DiagOpts->ShowColors);
692 }
693 
694 /*static*/ void
697  bool ShowColors) {
698  if (ShowColors) {
699  // Print diagnostic category in bold and color
700  switch (Level) {
702  llvm_unreachable("Invalid diagnostic type");
703  case DiagnosticsEngine::Note: OS.changeColor(noteColor, true); break;
704  case DiagnosticsEngine::Remark: OS.changeColor(remarkColor, true); break;
705  case DiagnosticsEngine::Warning: OS.changeColor(warningColor, true); break;
706  case DiagnosticsEngine::Error: OS.changeColor(errorColor, true); break;
707  case DiagnosticsEngine::Fatal: OS.changeColor(fatalColor, true); break;
708  }
709  }
710 
711  switch (Level) {
713  llvm_unreachable("Invalid diagnostic type");
714  case DiagnosticsEngine::Note: OS << "note: "; break;
715  case DiagnosticsEngine::Remark: OS << "remark: "; break;
716  case DiagnosticsEngine::Warning: OS << "warning: "; break;
717  case DiagnosticsEngine::Error: OS << "error: "; break;
718  case DiagnosticsEngine::Fatal: OS << "fatal error: "; break;
719  }
720 
721  if (ShowColors)
722  OS.resetColor();
723 }
724 
725 /*static*/
727  bool IsSupplemental,
728  StringRef Message,
729  unsigned CurrentColumn,
730  unsigned Columns, bool ShowColors) {
731  bool Bold = false;
732  if (ShowColors && !IsSupplemental) {
733  // Print primary diagnostic messages in bold and without color, to visually
734  // indicate the transition from continuation notes and other output.
735  OS.changeColor(savedColor, true);
736  Bold = true;
737  }
738 
739  if (Columns)
740  printWordWrapped(OS, Message, Columns, CurrentColumn, Bold);
741  else {
742  bool Normal = true;
743  applyTemplateHighlighting(OS, Message, Normal, Bold);
744  assert(Normal && "Formatting should have returned to normal");
745  }
746 
747  if (ShowColors)
748  OS.resetColor();
749  OS << '\n';
750 }
751 
752 void TextDiagnostic::emitFilename(StringRef Filename, const SourceManager &SM) {
753 #ifdef _WIN32
754  SmallString<4096> TmpFilename;
755 #endif
756  if (DiagOpts->AbsolutePath) {
757  auto File = SM.getFileManager().getFile(Filename);
758  if (File) {
759  // We want to print a simplified absolute path, i. e. without "dots".
760  //
761  // The hardest part here are the paths like "<part1>/<link>/../<part2>".
762  // On Unix-like systems, we cannot just collapse "<link>/..", because
763  // paths are resolved sequentially, and, thereby, the path
764  // "<part1>/<part2>" may point to a different location. That is why
765  // we use FileManager::getCanonicalName(), which expands all indirections
766  // with llvm::sys::fs::real_path() and caches the result.
767  //
768  // On the other hand, it would be better to preserve as much of the
769  // original path as possible, because that helps a user to recognize it.
770  // real_path() expands all links, which sometimes too much. Luckily,
771  // on Windows we can just use llvm::sys::path::remove_dots(), because,
772  // on that system, both aforementioned paths point to the same place.
773 #ifdef _WIN32
774  TmpFilename = (*File)->getName();
775  llvm::sys::fs::make_absolute(TmpFilename);
776  llvm::sys::path::native(TmpFilename);
777  llvm::sys::path::remove_dots(TmpFilename, /* remove_dot_dot */ true);
778  Filename = StringRef(TmpFilename.data(), TmpFilename.size());
779 #else
780  Filename = SM.getFileManager().getCanonicalName(*File);
781 #endif
782  }
783  }
784 
785  OS << Filename;
786 }
787 
788 /// Print out the file/line/column information and include trace.
789 ///
790 /// This method handlen the emission of the diagnostic location information.
791 /// This includes extracting as much location information as is present for
792 /// the diagnostic and printing it, as well as any include stack or source
793 /// ranges necessary.
796  ArrayRef<CharSourceRange> Ranges) {
797  if (PLoc.isInvalid()) {
798  // At least print the file name if available:
799  FileID FID = Loc.getFileID();
800  if (FID.isValid()) {
801  if (const FileEntry *FE = Loc.getFileEntry()) {
802  emitFilename(FE->getName(), Loc.getManager());
803  OS << ": ";
804  }
805  }
806  return;
807  }
808  unsigned LineNo = PLoc.getLine();
809 
810  if (!DiagOpts->ShowLocation)
811  return;
812 
813  if (DiagOpts->ShowColors)
814  OS.changeColor(savedColor, true);
815 
816  emitFilename(PLoc.getFilename(), Loc.getManager());
817  switch (DiagOpts->getFormat()) {
819  if (DiagOpts->ShowLine)
820  OS << ':' << LineNo;
821  break;
822  case DiagnosticOptions::MSVC: OS << '(' << LineNo; break;
823  case DiagnosticOptions::Vi: OS << " +" << LineNo; break;
824  }
825 
826  if (DiagOpts->ShowColumn)
827  // Compute the column number.
828  if (unsigned ColNo = PLoc.getColumn()) {
829  if (DiagOpts->getFormat() == DiagnosticOptions::MSVC) {
830  OS << ',';
831  // Visual Studio 2010 or earlier expects column number to be off by one
832  if (LangOpts.MSCompatibilityVersion &&
834  ColNo--;
835  } else
836  OS << ':';
837  OS << ColNo;
838  }
839  switch (DiagOpts->getFormat()) {
841  case DiagnosticOptions::Vi: OS << ':'; break;
843  // MSVC2013 and before print 'file(4) : error'. MSVC2015 gets rid of the
844  // space and prints 'file(4): error'.
845  OS << ')';
846  if (LangOpts.MSCompatibilityVersion &&
848  OS << ' ';
849  OS << ':';
850  break;
851  }
852 
853  if (DiagOpts->ShowSourceRanges && !Ranges.empty()) {
854  FileID CaretFileID = Loc.getExpansionLoc().getFileID();
855  bool PrintedRange = false;
856 
857  for (ArrayRef<CharSourceRange>::const_iterator RI = Ranges.begin(),
858  RE = Ranges.end();
859  RI != RE; ++RI) {
860  // Ignore invalid ranges.
861  if (!RI->isValid()) continue;
862 
863  auto &SM = Loc.getManager();
864  SourceLocation B = SM.getExpansionLoc(RI->getBegin());
865  CharSourceRange ERange = SM.getExpansionRange(RI->getEnd());
866  SourceLocation E = ERange.getEnd();
867  bool IsTokenRange = ERange.isTokenRange();
868 
869  std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
870  std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);
871 
872  // If the start or end of the range is in another file, just discard
873  // it.
874  if (BInfo.first != CaretFileID || EInfo.first != CaretFileID)
875  continue;
876 
877  // Add in the length of the token, so that we cover multi-char
878  // tokens.
879  unsigned TokSize = 0;
880  if (IsTokenRange)
881  TokSize = Lexer::MeasureTokenLength(E, SM, LangOpts);
882 
883  FullSourceLoc BF(B, SM), EF(E, SM);
884  OS << '{'
885  << BF.getLineNumber() << ':' << BF.getColumnNumber() << '-'
886  << EF.getLineNumber() << ':' << (EF.getColumnNumber() + TokSize)
887  << '}';
888  PrintedRange = true;
889  }
890 
891  if (PrintedRange)
892  OS << ':';
893  }
894  OS << ' ';
895 }
896 
898  if (DiagOpts->ShowLocation && PLoc.isValid())
899  OS << "In file included from " << PLoc.getFilename() << ':'
900  << PLoc.getLine() << ":\n";
901  else
902  OS << "In included file:\n";
903 }
904 
906  StringRef ModuleName) {
907  if (DiagOpts->ShowLocation && PLoc.isValid())
908  OS << "In module '" << ModuleName << "' imported from "
909  << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
910  else
911  OS << "In module '" << ModuleName << "':\n";
912 }
913 
915  PresumedLoc PLoc,
916  StringRef ModuleName) {
917  if (DiagOpts->ShowLocation && PLoc.isValid())
918  OS << "While building module '" << ModuleName << "' imported from "
919  << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
920  else
921  OS << "While building module '" << ModuleName << "':\n";
922 }
923 
924 /// Find the suitable set of lines to show to include a set of ranges.
927  const SourceManager &SM) {
928  if (!R.isValid()) return None;
929 
931  SourceLocation End = R.getEnd();
932  if (SM.getFileID(Begin) != FID || SM.getFileID(End) != FID)
933  return None;
934 
935  return std::make_pair(SM.getExpansionLineNumber(Begin),
936  SM.getExpansionLineNumber(End));
937 }
938 
939 /// Add as much of range B into range A as possible without exceeding a maximum
940 /// size of MaxRange. Ranges are inclusive.
941 static std::pair<unsigned, unsigned>
942 maybeAddRange(std::pair<unsigned, unsigned> A, std::pair<unsigned, unsigned> B,
943  unsigned MaxRange) {
944  // If A is already the maximum size, we're done.
945  unsigned Slack = MaxRange - (A.second - A.first + 1);
946  if (Slack == 0)
947  return A;
948 
949  // Easy case: merge succeeds within MaxRange.
950  unsigned Min = std::min(A.first, B.first);
951  unsigned Max = std::max(A.second, B.second);
952  if (Max - Min + 1 <= MaxRange)
953  return {Min, Max};
954 
955  // If we can't reach B from A within MaxRange, there's nothing to do.
956  // Don't add lines to the range that contain nothing interesting.
957  if ((B.first > A.first && B.first - A.first + 1 > MaxRange) ||
958  (B.second < A.second && A.second - B.second + 1 > MaxRange))
959  return A;
960 
961  // Otherwise, expand A towards B to produce a range of size MaxRange. We
962  // attempt to expand by the same amount in both directions if B strictly
963  // contains A.
964 
965  // Expand downwards by up to half the available amount, then upwards as
966  // much as possible, then downwards as much as possible.
967  A.second = std::min(A.second + (Slack + 1) / 2, Max);
968  Slack = MaxRange - (A.second - A.first + 1);
969  A.first = std::max(Min + Slack, A.first) - Slack;
970  A.second = std::min(A.first + MaxRange - 1, Max);
971  return A;
972 }
973 
974 /// Highlight a SourceRange (with ~'s) for any characters on LineNo.
975 static void highlightRange(const CharSourceRange &R,
976  unsigned LineNo, FileID FID,
977  const SourceColumnMap &map,
978  std::string &CaretLine,
979  const SourceManager &SM,
980  const LangOptions &LangOpts) {
981  if (!R.isValid()) return;
982 
984  SourceLocation End = R.getEnd();
985 
986  unsigned StartLineNo = SM.getExpansionLineNumber(Begin);
987  if (StartLineNo > LineNo || SM.getFileID(Begin) != FID)
988  return; // No intersection.
989 
990  unsigned EndLineNo = SM.getExpansionLineNumber(End);
991  if (EndLineNo < LineNo || SM.getFileID(End) != FID)
992  return; // No intersection.
993 
994  // Compute the column number of the start.
995  unsigned StartColNo = 0;
996  if (StartLineNo == LineNo) {
997  StartColNo = SM.getExpansionColumnNumber(Begin);
998  if (StartColNo) --StartColNo; // Zero base the col #.
999  }
1000 
1001  // Compute the column number of the end.
1002  unsigned EndColNo = map.getSourceLine().size();
1003  if (EndLineNo == LineNo) {
1004  EndColNo = SM.getExpansionColumnNumber(End);
1005  if (EndColNo) {
1006  --EndColNo; // Zero base the col #.
1007 
1008  // Add in the length of the token, so that we cover multi-char tokens if
1009  // this is a token range.
1010  if (R.isTokenRange())
1011  EndColNo += Lexer::MeasureTokenLength(End, SM, LangOpts);
1012  } else {
1013  EndColNo = CaretLine.size();
1014  }
1015  }
1016 
1017  assert(StartColNo <= EndColNo && "Invalid range!");
1018 
1019  // Check that a token range does not highlight only whitespace.
1020  if (R.isTokenRange()) {
1021  // Pick the first non-whitespace column.
1022  while (StartColNo < map.getSourceLine().size() &&
1023  (map.getSourceLine()[StartColNo] == ' ' ||
1024  map.getSourceLine()[StartColNo] == '\t'))
1025  StartColNo = map.startOfNextColumn(StartColNo);
1026 
1027  // Pick the last non-whitespace column.
1028  if (EndColNo > map.getSourceLine().size())
1029  EndColNo = map.getSourceLine().size();
1030  while (EndColNo &&
1031  (map.getSourceLine()[EndColNo-1] == ' ' ||
1032  map.getSourceLine()[EndColNo-1] == '\t'))
1033  EndColNo = map.startOfPreviousColumn(EndColNo);
1034 
1035  // If the start/end passed each other, then we are trying to highlight a
1036  // range that just exists in whitespace. That most likely means we have
1037  // a multi-line highlighting range that covers a blank line.
1038  if (StartColNo > EndColNo) {
1039  assert(StartLineNo != EndLineNo && "trying to highlight whitespace");
1040  StartColNo = EndColNo;
1041  }
1042  }
1043 
1044  assert(StartColNo <= map.getSourceLine().size() && "Invalid range!");
1045  assert(EndColNo <= map.getSourceLine().size() && "Invalid range!");
1046 
1047  // Fill the range with ~'s.
1048  StartColNo = map.byteToContainingColumn(StartColNo);
1049  EndColNo = map.byteToContainingColumn(EndColNo);
1050 
1051  assert(StartColNo <= EndColNo && "Invalid range!");
1052  if (CaretLine.size() < EndColNo)
1053  CaretLine.resize(EndColNo,' ');
1054  std::fill(CaretLine.begin()+StartColNo,CaretLine.begin()+EndColNo,'~');
1055 }
1056 
1058  unsigned LineNo,
1059  const SourceColumnMap &map,
1060  ArrayRef<FixItHint> Hints,
1061  const SourceManager &SM,
1062  const DiagnosticOptions *DiagOpts) {
1063  std::string FixItInsertionLine;
1064  if (Hints.empty() || !DiagOpts->ShowFixits)
1065  return FixItInsertionLine;
1066  unsigned PrevHintEndCol = 0;
1067 
1068  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
1069  I != E; ++I) {
1070  if (!I->CodeToInsert.empty()) {
1071  // We have an insertion hint. Determine whether the inserted
1072  // code contains no newlines and is on the same line as the caret.
1073  std::pair<FileID, unsigned> HintLocInfo
1074  = SM.getDecomposedExpansionLoc(I->RemoveRange.getBegin());
1075  if (FID == HintLocInfo.first &&
1076  LineNo == SM.getLineNumber(HintLocInfo.first, HintLocInfo.second) &&
1077  StringRef(I->CodeToInsert).find_first_of("\n\r") == StringRef::npos) {
1078  // Insert the new code into the line just below the code
1079  // that the user wrote.
1080  // Note: When modifying this function, be very careful about what is a
1081  // "column" (printed width, platform-dependent) and what is a
1082  // "byte offset" (SourceManager "column").
1083  unsigned HintByteOffset
1084  = SM.getColumnNumber(HintLocInfo.first, HintLocInfo.second) - 1;
1085 
1086  // The hint must start inside the source or right at the end
1087  assert(HintByteOffset < static_cast<unsigned>(map.bytes())+1);
1088  unsigned HintCol = map.byteToContainingColumn(HintByteOffset);
1089 
1090  // If we inserted a long previous hint, push this one forwards, and add
1091  // an extra space to show that this is not part of the previous
1092  // completion. This is sort of the best we can do when two hints appear
1093  // to overlap.
1094  //
1095  // Note that if this hint is located immediately after the previous
1096  // hint, no space will be added, since the location is more important.
1097  if (HintCol < PrevHintEndCol)
1098  HintCol = PrevHintEndCol + 1;
1099 
1100  // This should NOT use HintByteOffset, because the source might have
1101  // Unicode characters in earlier columns.
1102  unsigned NewFixItLineSize = FixItInsertionLine.size() +
1103  (HintCol - PrevHintEndCol) + I->CodeToInsert.size();
1104  if (NewFixItLineSize > FixItInsertionLine.size())
1105  FixItInsertionLine.resize(NewFixItLineSize, ' ');
1106 
1107  std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
1108  FixItInsertionLine.end() - I->CodeToInsert.size());
1109 
1110  PrevHintEndCol =
1111  HintCol + llvm::sys::locale::columnWidth(I->CodeToInsert);
1112  }
1113  }
1114  }
1115 
1116  expandTabs(FixItInsertionLine, DiagOpts->TabStop);
1117 
1118  return FixItInsertionLine;
1119 }
1120 
1121 /// Emit a code snippet and caret line.
1122 ///
1123 /// This routine emits a single line's code snippet and caret line..
1124 ///
1125 /// \param Loc The location for the caret.
1126 /// \param Ranges The underlined ranges for this code snippet.
1127 /// \param Hints The FixIt hints active for this diagnostic.
1128 void TextDiagnostic::emitSnippetAndCaret(
1131  assert(Loc.isValid() && "must have a valid source location here");
1132  assert(Loc.isFileID() && "must have a file location here");
1133 
1134  // If caret diagnostics are enabled and we have location, we want to
1135  // emit the caret. However, we only do this if the location moved
1136  // from the last diagnostic, if the last diagnostic was a note that
1137  // was part of a different warning or error diagnostic, or if the
1138  // diagnostic has ranges. We don't want to emit the same caret
1139  // multiple times if one loc has multiple diagnostics.
1140  if (!DiagOpts->ShowCarets)
1141  return;
1142  if (Loc == LastLoc && Ranges.empty() && Hints.empty() &&
1144  return;
1145 
1146  // Decompose the location into a FID/Offset pair.
1147  std::pair<FileID, unsigned> LocInfo = Loc.getDecomposedLoc();
1148  FileID FID = LocInfo.first;
1149  const SourceManager &SM = Loc.getManager();
1150 
1151  // Get information about the buffer it points into.
1152  bool Invalid = false;
1153  StringRef BufData = Loc.getBufferData(&Invalid);
1154  if (Invalid)
1155  return;
1156 
1157  unsigned CaretLineNo = Loc.getLineNumber();
1158  unsigned CaretColNo = Loc.getColumnNumber();
1159 
1160  // Arbitrarily stop showing snippets when the line is too long.
1161  static const size_t MaxLineLengthToPrint = 4096;
1162  if (CaretColNo > MaxLineLengthToPrint)
1163  return;
1164 
1165  // Find the set of lines to include.
1166  const unsigned MaxLines = DiagOpts->SnippetLineLimit;
1167  std::pair<unsigned, unsigned> Lines = {CaretLineNo, CaretLineNo};
1168  for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
1169  E = Ranges.end();
1170  I != E; ++I)
1171  if (auto OptionalRange = findLinesForRange(*I, FID, SM))
1172  Lines = maybeAddRange(Lines, *OptionalRange, MaxLines);
1173 
1174  for (unsigned LineNo = Lines.first; LineNo != Lines.second + 1; ++LineNo) {
1175  const char *BufStart = BufData.data();
1176  const char *BufEnd = BufStart + BufData.size();
1177 
1178  // Rewind from the current position to the start of the line.
1179  const char *LineStart =
1180  BufStart +
1181  SM.getDecomposedLoc(SM.translateLineCol(FID, LineNo, 1)).second;
1182  if (LineStart == BufEnd)
1183  break;
1184 
1185  // Compute the line end.
1186  const char *LineEnd = LineStart;
1187  while (*LineEnd != '\n' && *LineEnd != '\r' && LineEnd != BufEnd)
1188  ++LineEnd;
1189 
1190  // Arbitrarily stop showing snippets when the line is too long.
1191  // FIXME: Don't print any lines in this case.
1192  if (size_t(LineEnd - LineStart) > MaxLineLengthToPrint)
1193  return;
1194 
1195  // Trim trailing null-bytes.
1196  StringRef Line(LineStart, LineEnd - LineStart);
1197  while (!Line.empty() && Line.back() == '\0' &&
1198  (LineNo != CaretLineNo || Line.size() > CaretColNo))
1199  Line = Line.drop_back();
1200 
1201  // Copy the line of code into an std::string for ease of manipulation.
1202  std::string SourceLine(Line.begin(), Line.end());
1203 
1204  // Build the byte to column map.
1205  const SourceColumnMap sourceColMap(SourceLine, DiagOpts->TabStop);
1206 
1207  // Create a line for the caret that is filled with spaces that is the same
1208  // number of columns as the line of source code.
1209  std::string CaretLine(sourceColMap.columns(), ' ');
1210 
1211  // Highlight all of the characters covered by Ranges with ~ characters.
1212  for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
1213  E = Ranges.end();
1214  I != E; ++I)
1215  highlightRange(*I, LineNo, FID, sourceColMap, CaretLine, SM, LangOpts);
1216 
1217  // Next, insert the caret itself.
1218  if (CaretLineNo == LineNo) {
1219  CaretColNo = sourceColMap.byteToContainingColumn(CaretColNo - 1);
1220  if (CaretLine.size() < CaretColNo + 1)
1221  CaretLine.resize(CaretColNo + 1, ' ');
1222  CaretLine[CaretColNo] = '^';
1223  }
1224 
1225  std::string FixItInsertionLine = buildFixItInsertionLine(
1226  FID, LineNo, sourceColMap, Hints, SM, DiagOpts.get());
1227 
1228  // If the source line is too long for our terminal, select only the
1229  // "interesting" source region within that line.
1230  unsigned Columns = DiagOpts->MessageLength;
1231  if (Columns)
1232  selectInterestingSourceRegion(SourceLine, CaretLine, FixItInsertionLine,
1233  Columns, sourceColMap);
1234 
1235  // If we are in -fdiagnostics-print-source-range-info mode, we are trying
1236  // to produce easily machine parsable output. Add a space before the
1237  // source line and the caret to make it trivial to tell the main diagnostic
1238  // line from what the user is intended to see.
1239  if (DiagOpts->ShowSourceRanges) {
1240  SourceLine = ' ' + SourceLine;
1241  CaretLine = ' ' + CaretLine;
1242  }
1243 
1244  // Finally, remove any blank spaces from the end of CaretLine.
1245  while (!CaretLine.empty() && CaretLine[CaretLine.size() - 1] == ' ')
1246  CaretLine.erase(CaretLine.end() - 1);
1247 
1248  // Emit what we have computed.
1249  emitSnippet(SourceLine);
1250 
1251  if (!CaretLine.empty()) {
1252  if (DiagOpts->ShowColors)
1253  OS.changeColor(caretColor, true);
1254  OS << CaretLine << '\n';
1255  if (DiagOpts->ShowColors)
1256  OS.resetColor();
1257  }
1258 
1259  if (!FixItInsertionLine.empty()) {
1260  if (DiagOpts->ShowColors)
1261  // Print fixit line in color
1262  OS.changeColor(fixitColor, false);
1263  if (DiagOpts->ShowSourceRanges)
1264  OS << ' ';
1265  OS << FixItInsertionLine << '\n';
1266  if (DiagOpts->ShowColors)
1267  OS.resetColor();
1268  }
1269  }
1270 
1271  // Print out any parseable fixit information requested by the options.
1272  emitParseableFixits(Hints, SM);
1273 }
1274 
1275 void TextDiagnostic::emitSnippet(StringRef line) {
1276  if (line.empty())
1277  return;
1278 
1279  size_t i = 0;
1280 
1281  std::string to_print;
1282  bool print_reversed = false;
1283 
1284  while (i<line.size()) {
1285  std::pair<SmallString<16>,bool> res
1286  = printableTextForNextCharacter(line, &i, DiagOpts->TabStop);
1287  bool was_printable = res.second;
1288 
1289  if (DiagOpts->ShowColors && was_printable == print_reversed) {
1290  if (print_reversed)
1291  OS.reverseColor();
1292  OS << to_print;
1293  to_print.clear();
1294  if (DiagOpts->ShowColors)
1295  OS.resetColor();
1296  }
1297 
1298  print_reversed = !was_printable;
1299  to_print += res.first.str();
1300  }
1301 
1302  if (print_reversed && DiagOpts->ShowColors)
1303  OS.reverseColor();
1304  OS << to_print;
1305  if (print_reversed && DiagOpts->ShowColors)
1306  OS.resetColor();
1307 
1308  OS << '\n';
1309 }
1310 
1311 void TextDiagnostic::emitParseableFixits(ArrayRef<FixItHint> Hints,
1312  const SourceManager &SM) {
1313  if (!DiagOpts->ShowParseableFixits)
1314  return;
1315 
1316  // We follow FixItRewriter's example in not (yet) handling
1317  // fix-its in macros.
1318  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
1319  I != E; ++I) {
1320  if (I->RemoveRange.isInvalid() ||
1321  I->RemoveRange.getBegin().isMacroID() ||
1322  I->RemoveRange.getEnd().isMacroID())
1323  return;
1324  }
1325 
1326  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
1327  I != E; ++I) {
1328  SourceLocation BLoc = I->RemoveRange.getBegin();
1329  SourceLocation ELoc = I->RemoveRange.getEnd();
1330 
1331  std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(BLoc);
1332  std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(ELoc);
1333 
1334  // Adjust for token ranges.
1335  if (I->RemoveRange.isTokenRange())
1336  EInfo.second += Lexer::MeasureTokenLength(ELoc, SM, LangOpts);
1337 
1338  // We specifically do not do word-wrapping or tab-expansion here,
1339  // because this is supposed to be easy to parse.
1340  PresumedLoc PLoc = SM.getPresumedLoc(BLoc);
1341  if (PLoc.isInvalid())
1342  break;
1343 
1344  OS << "fix-it:\"";
1345  OS.write_escaped(PLoc.getFilename());
1346  OS << "\":{" << SM.getLineNumber(BInfo.first, BInfo.second)
1347  << ':' << SM.getColumnNumber(BInfo.first, BInfo.second)
1348  << '-' << SM.getLineNumber(EInfo.first, EInfo.second)
1349  << ':' << SM.getColumnNumber(EInfo.first, EInfo.second)
1350  << "}:\"";
1351  OS.write_escaped(I->CodeToInsert);
1352  OS << "\"\n";
1353  }
1354 }
findMatchingPunctuation
static char findMatchingPunctuation(char c)
If the given character is the start of some kind of balanced punctuation (e.g., quotes or parentheses...
Definition: TextDiagnostic.cpp:526
clang::DiagnosticsEngine::Level
Level
The level of the diagnostic, after it has been through mapping.
Definition: Diagnostic.h:195
max
__DEVICE__ int max(int __a, int __b)
Definition: __clang_cuda_math.h:196
clang::FullSourceLoc::getManager
const SourceManager & getManager() const
Definition: SourceLocation.h:382
caretColor
static enum raw_ostream::Colors caretColor
Definition: TextDiagnostic.cpp:32
clang::CharSourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:283
clang::FullSourceLoc::getFileEntry
const FileEntry * getFileEntry() const
Definition: SourceLocation.cpp:221
clang::FullSourceLoc
A SourceLocation and its associated SourceManager.
Definition: SourceLocation.h:368
clang::DeclaratorContext::File
@ File
string
string(SUBSTRING ${CMAKE_CURRENT_BINARY_DIR} 0 ${PATH_LIB_START} PATH_HEAD) string(SUBSTRING $
Definition: CMakeLists.txt:22
clang::PresumedLoc::getLine
unsigned getLine() const
Return the presumed line number of this location.
Definition: SourceLocation.h:337
clang::DiagnosticOptions::MSVC
@ MSVC
Definition: DiagnosticOptions.h:77
TextDiagnostic.h
llvm::SmallVector
Definition: LLVM.h:38
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::format::encoding::columnWidth
unsigned columnWidth(StringRef Text, Encoding Encoding)
Returns the number of columns required to display the Text on a generic Unicode-capable terminal.
Definition: Encoding.h:45
warningColor
static enum raw_ostream::Colors warningColor
Definition: TextDiagnostic.cpp:34
errorColor
static enum raw_ostream::Colors errorColor
Definition: TextDiagnostic.cpp:38
Filename
StringRef Filename
Definition: Format.cpp:2551
skipWhitespace
static unsigned skipWhitespace(unsigned Idx, StringRef Str, unsigned Length)
Skip over whitespace in the string, starting at the given index.
Definition: TextDiagnostic.cpp:514
WordWrapIndentation
const unsigned WordWrapIndentation
Number of spaces to indent when word-wrapping.
Definition: TextDiagnostic.cpp:66
llvm::Optional
Definition: LLVM.h:40
clang::DiagOrStoredDiag
llvm::PointerUnion< const Diagnostic *, const StoredDiagnostic * > DiagOrStoredDiag
Definition: DiagnosticRenderer.h:33
SourceManager.h
clang::DiagnosticRenderer
Class to encapsulate the logic for formatting a diagnostic message.
Definition: DiagnosticRenderer.h:47
clang::Lexer::MeasureTokenLength
static unsigned MeasureTokenLength(SourceLocation Loc, const SourceManager &SM, const LangOptions &LangOpts)
MeasureTokenLength - Relex the token at the specified location and return its length in bytes in the ...
Definition: Lexer.cpp:452
clang::DiagnosticRenderer::LastLoc
SourceLocation LastLoc
The location of the previous diagnostic if known.
Definition: DiagnosticRenderer.h:57
End
SourceLocation End
Definition: USRLocFinder.cpp:167
printableTextForNextCharacter
static std::pair< SmallString< 16 >, bool > printableTextForNextCharacter(StringRef SourceLine, size_t *i, unsigned TabStop)
returns a printable representation of first item from input range
Definition: TextDiagnostic.cpp:98
clang::SourceManager
This class handles loading and caching of source files into memory.
Definition: SourceManager.h:627
findEndOfWord
static unsigned findEndOfWord(unsigned Start, StringRef Str, unsigned Length, unsigned Column, unsigned Columns)
Find the end of the word starting at the given offset within a string.
Definition: TextDiagnostic.cpp:545
fatalColor
static enum raw_ostream::Colors fatalColor
Definition: TextDiagnostic.cpp:39
clang::FullSourceLoc::getBufferData
StringRef getBufferData(bool *Invalid=nullptr) const
Return a StringRef to the source buffer data for the specified FileID.
Definition: SourceLocation.cpp:265
clang::TextDiagnostic::emitBuildingModuleLocation
void emitBuildingModuleLocation(FullSourceLoc Loc, PresumedLoc PLoc, StringRef ModuleName) override
Definition: TextDiagnostic.cpp:914
printWordWrapped
static bool printWordWrapped(raw_ostream &OS, StringRef Str, unsigned Columns, unsigned Column=0, bool Bold=false, unsigned Indentation=WordWrapIndentation)
Print the given string to a stream, word-wrapping it to some number of columns in the process.
Definition: TextDiagnostic.cpp:612
clang::LangOptions::isCompatibleWithMSVC
bool isCompatibleWithMSVC(MSVCMajorVersion MajorVersion) const
Definition: LangOptions.h:505
min
__DEVICE__ int min(int __a, int __b)
Definition: __clang_cuda_math.h:197
clang::DiagnosticRenderer::LangOpts
const LangOptions & LangOpts
Definition: DiagnosticRenderer.h:49
clang::TextDiagnostic::TextDiagnostic
TextDiagnostic(raw_ostream &OS, const LangOptions &LangOpts, DiagnosticOptions *DiagOpts)
Definition: TextDiagnostic.cpp:666
remarkColor
static enum raw_ostream::Colors remarkColor
Definition: TextDiagnostic.cpp:28
clang::TextDiagnostic::~TextDiagnostic
~TextDiagnostic() override
Definition: TextDiagnostic.cpp:671
clang::PresumedLoc::getFilename
const char * getFilename() const
Return the presumed filename of this location.
Definition: SourceLocation.h:324
clang::DiagnosticsEngine::Remark
@ Remark
Definition: Diagnostic.h:198
clang::TextDiagnostic::printDiagnosticLevel
static void printDiagnosticLevel(raw_ostream &OS, DiagnosticsEngine::Level Level, bool ShowColors)
Print the diagonstic level to a raw_ostream.
Definition: TextDiagnostic.cpp:695
clang::FileID::isValid
bool isValid() const
Definition: SourceLocation.h:44
clang::DiagnosticsEngine::Error
@ Error
Definition: Diagnostic.h:200
clang::TextDiagnostic::emitDiagnosticMessage
void emitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level, StringRef Message, ArrayRef< CharSourceRange > Ranges, DiagOrStoredDiag D) override
Definition: TextDiagnostic.cpp:673
clang::TextDiagnostic::emitIncludeLocation
void emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) override
Definition: TextDiagnostic.cpp:897
llvm::SmallString< 16 >
clang::SourceLocation::isFileID
bool isFileID() const
Definition: SourceLocation.h:102
clang::PresumedLoc::getColumn
unsigned getColumn() const
Return the presumed column number of this location.
Definition: SourceLocation.h:345
selectInterestingSourceRegion
static void selectInterestingSourceRegion(std::string &SourceLine, std::string &CaretLine, std::string &FixItInsertionLine, unsigned Columns, const SourceColumnMap &map)
When the source code line we want to print is too long for the terminal, select the "interesting" reg...
Definition: TextDiagnostic.cpp:321
savedColor
static enum raw_ostream::Colors savedColor
Definition: TextDiagnostic.cpp:41
Line
const AnnotatedLine * Line
Definition: UsingDeclarationsSorter.cpp:68
clang::DiagnosticRenderer::DiagOpts
IntrusiveRefCntPtr< DiagnosticOptions > DiagOpts
Definition: DiagnosticRenderer.h:50
applyTemplateHighlighting
static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str, bool &Normal, bool Bold)
Add highlights to differences in template strings.
Definition: TextDiagnostic.cpp:45
clang::FileEntry
Cached information about one file (either on disk or in the virtual file system).
Definition: FileEntry.h:330
maybeAddRange
static std::pair< unsigned, unsigned > maybeAddRange(std::pair< unsigned, unsigned > A, std::pair< unsigned, unsigned > B, unsigned MaxRange)
Add as much of range B into range A as possible without exceeding a maximum size of MaxRange.
Definition: TextDiagnostic.cpp:942
bytesSincePreviousTabOrLineBegin
static int bytesSincePreviousTabOrLineBegin(StringRef SourceLine, size_t i)
Definition: TextDiagnostic.cpp:68
clang::DiagnosticOptions::Vi
@ Vi
Definition: DiagnosticOptions.h:77
clang::TextDiagnostic::emitDiagnosticLoc
void emitDiagnosticLoc(FullSourceLoc Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level, ArrayRef< CharSourceRange > Ranges) override
Print out the file/line/column information and include trace.
Definition: TextDiagnostic.cpp:794
clang::PresumedLoc::isInvalid
bool isInvalid() const
Return true if this object is invalid or uninitialized.
Definition: SourceLocation.h:318
clang::isWhitespace
LLVM_READONLY bool isWhitespace(unsigned char c)
Return true if this character is horizontal or vertical ASCII whitespace: ' ', '\t',...
Definition: CharInfo.h:93
templateColor
static enum raw_ostream::Colors templateColor
Definition: TextDiagnostic.cpp:36
fixitColor
static enum raw_ostream::Colors fixitColor
Definition: TextDiagnostic.cpp:30
CharInfo.h
clang::FullSourceLoc::getExpansionLoc
FullSourceLoc getExpansionLoc() const
Definition: SourceLocation.cpp:164
clang::TextDiagnostic::printDiagnosticMessage
static void printDiagnosticMessage(raw_ostream &OS, bool IsSupplemental, StringRef Message, unsigned CurrentColumn, unsigned Columns, bool ShowColors)
Pretty-print a diagnostic message to a raw_ostream.
Definition: TextDiagnostic.cpp:726
clang::DiagnosticRenderer::LastLevel
DiagnosticsEngine::Level LastLevel
The level of the last diagnostic emitted.
Definition: DiagnosticRenderer.h:69
clang::DiagnosticsEngine::Ignored
@ Ignored
Definition: Diagnostic.h:196
clang::CharSourceRange::isTokenRange
bool isTokenRange() const
Return true if the end of this range specifies the start of the last token.
Definition: SourceLocation.h:280
Begin
SourceLocation Begin
Definition: USRLocFinder.cpp:165
llvm::ArrayRef
Definition: LLVM.h:34
Lexer.h
clang::CharSourceRange
Represents a character-granular source range.
Definition: SourceLocation.h:253
columnToByte
static void columnToByte(StringRef SourceLine, unsigned TabStop, SmallVectorImpl< int > &out)
This function takes a raw source line and produces a mapping from columns to the byte of the source l...
Definition: TextDiagnostic.cpp:231
highlightRange
static void highlightRange(const CharSourceRange &R, unsigned LineNo, FileID FID, const SourceColumnMap &map, std::string &CaretLine, const SourceManager &SM, const LangOptions &LangOpts)
Highlight a SourceRange (with ~'s) for any characters on LineNo.
Definition: TextDiagnostic.cpp:975
clang::ToggleHighlight
const char ToggleHighlight
Special character that the diagnostic printer will use to toggle the bold attribute.
Definition: Diagnostic.h:1834
clang::CharSourceRange::getEnd
SourceLocation getEnd() const
Definition: SourceLocation.h:284
clang::DiagnosticOptions::MaxTabStop
@ MaxTabStop
Definition: DiagnosticOptions.h:82
clang::FullSourceLoc::getFileID
FileID getFileID() const
Definition: SourceLocation.cpp:159
byteToColumn
static void byteToColumn(StringRef SourceLine, unsigned TabStop, SmallVectorImpl< int > &out)
This function takes a raw source line and produces a mapping from the bytes of the printable represen...
Definition: TextDiagnostic.cpp:197
noteColor
static enum raw_ostream::Colors noteColor
Definition: TextDiagnostic.cpp:26
clang::LangOptions
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:78
bytes
static StringRef bytes(const std::vector< T, Allocator > &v)
Definition: ASTWriter.cpp:123
clang::PresumedLoc::isValid
bool isValid() const
Definition: SourceLocation.h:319
clang::CharSourceRange::isValid
bool isValid() const
Definition: SourceLocation.h:291
clang
Definition: CalledOnceCheck.h:17
clang::LangOptions::MSVC2015
@ MSVC2015
Definition: LangOptions.h:145
findLinesForRange
static llvm::Optional< std::pair< unsigned, unsigned > > findLinesForRange(const CharSourceRange &R, FileID FID, const SourceManager &SM)
Find the suitable set of lines to show to include a set of ranges.
Definition: TextDiagnostic.cpp:926
clang::prec::Level
Level
Definition: OperatorPrecedence.h:26
clang::FileID
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
Definition: SourceLocation.h:38
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:110
clang::OverloadCandidateParamOrder::Normal
@ Normal
clang::TextDiagnostic::emitImportLocation
void emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc, StringRef ModuleName) override
Definition: TextDiagnostic.cpp:905
DiagnosticOptions.h
c
__device__ __2f16 float c
Definition: __clang_hip_libdevice_declares.h:315
expandTabs
static void expandTabs(std::string &SourceLine, unsigned TabStop)
Definition: TextDiagnostic.cpp:162
clang::DiagnosticsEngine::Fatal
@ Fatal
Definition: Diagnostic.h:201
clang::DiagnosticsEngine::Note
@ Note
Definition: Diagnostic.h:197
buildFixItInsertionLine
static std::string buildFixItInsertionLine(FileID FID, unsigned LineNo, const SourceColumnMap &map, ArrayRef< FixItHint > Hints, const SourceManager &SM, const DiagnosticOptions *DiagOpts)
Definition: TextDiagnostic.cpp:1057
clang::PresumedLoc
Represents an unpacked "presumed" location which can be presented to the user.
Definition: SourceLocation.h:302
llvm::SmallVectorImpl
Definition: Randstruct.h:18
FileManager.h
SM
#define SM(sm)
Definition: Cuda.cpp:81
clang::FullSourceLoc::getLineNumber
unsigned getLineNumber(bool *Invalid=nullptr) const
Definition: SourceLocation.cpp:211
clang::DiagnosticOptions::Clang
@ Clang
Definition: DiagnosticOptions.h:77
clang::FullSourceLoc::getDecomposedLoc
std::pair< FileID, unsigned > getDecomposedLoc() const
Decompose the specified location into a raw FileID + Offset pair.
Definition: SourceLocation.cpp:270
clang::DiagnosticsEngine::Warning
@ Warning
Definition: Diagnostic.h:199
clang::RISCV::Invalid
@ Invalid
Definition: RISCVVIntrinsicUtils.h:148
clang::DiagnosticOptions
Options for controlling the compiler diagnostics engine.
Definition: DiagnosticOptions.h:70
clang::FullSourceLoc::getColumnNumber
unsigned getColumnNumber(bool *Invalid=nullptr) const
Definition: SourceLocation.cpp:216
clang::LangOptions::MSVC2012
@ MSVC2012
Definition: LangOptions.h:143