1 //===--- TextDiagnosticPrinter.cpp - Diagnostic Printer -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This diagnostic client prints out their diagnostic messages.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Frontend/TextDiagnosticPrinter.h"
15 #include "clang/Basic/FileManager.h"
16 #include "clang/Basic/SourceManager.h"
17 #include "clang/Frontend/DiagnosticOptions.h"
18 #include "clang/Lex/Lexer.h"
19 #include "llvm/Support/MemoryBuffer.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/ADT/StringExtras.h"
24 using namespace clang;
26 static const enum llvm::raw_ostream::Colors noteColor =
27 llvm::raw_ostream::BLACK;
28 static const enum llvm::raw_ostream::Colors fixitColor =
29 llvm::raw_ostream::GREEN;
30 static const enum llvm::raw_ostream::Colors caretColor =
31 llvm::raw_ostream::GREEN;
32 static const enum llvm::raw_ostream::Colors warningColor =
33 llvm::raw_ostream::MAGENTA;
34 static const enum llvm::raw_ostream::Colors errorColor = llvm::raw_ostream::RED;
35 static const enum llvm::raw_ostream::Colors fatalColor = llvm::raw_ostream::RED;
36 // Used for changing only the bold attribute.
37 static const enum llvm::raw_ostream::Colors savedColor =
38 llvm::raw_ostream::SAVEDCOLOR;
40 /// \brief Number of spaces to indent when word-wrapping.
41 const unsigned WordWrapIndentation = 6;
43 TextDiagnosticPrinter::TextDiagnosticPrinter(llvm::raw_ostream &os,
44 const DiagnosticOptions &diags,
45 bool _OwnsOutputStream)
46 : OS(os), LangOpts(0), DiagOpts(&diags),
47 LastCaretDiagnosticWasNote(0),
48 OwnsOutputStream(_OwnsOutputStream) {
51 TextDiagnosticPrinter::~TextDiagnosticPrinter() {
56 void TextDiagnosticPrinter::PrintIncludeStack(Diagnostic::Level Level,
58 const SourceManager &SM) {
59 if (!DiagOpts->ShowNoteIncludeStack && Level == Diagnostic::Note) return;
61 if (Loc.isInvalid()) return;
63 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
67 // Print out the other include frames first.
68 PrintIncludeStack(Level, PLoc.getIncludeLoc(), SM);
70 if (DiagOpts->ShowLocation)
71 OS << "In file included from " << PLoc.getFilename()
72 << ':' << PLoc.getLine() << ":\n";
74 OS << "In included file:\n";
77 /// HighlightRange - Given a SourceRange and a line number, highlight (with ~'s)
78 /// any characters in LineNo that intersect the SourceRange.
79 void TextDiagnosticPrinter::HighlightRange(const CharSourceRange &R,
80 const SourceManager &SM,
81 unsigned LineNo, FileID FID,
82 std::string &CaretLine,
83 const std::string &SourceLine) {
84 assert(CaretLine.size() == SourceLine.size() &&
85 "Expect a correspondence between source and caret line!");
86 if (!R.isValid()) return;
88 SourceLocation Begin = SM.getInstantiationLoc(R.getBegin());
89 SourceLocation End = SM.getInstantiationLoc(R.getEnd());
91 // If the End location and the start location are the same and are a macro
92 // location, then the range was something that came from a macro expansion
93 // or _Pragma. If this is an object-like macro, the best we can do is to
94 // highlight the range. If this is a function-like macro, we'd also like to
95 // highlight the arguments.
96 if (Begin == End && R.getEnd().isMacroID())
97 End = SM.getInstantiationRange(R.getEnd()).second;
99 unsigned StartLineNo = SM.getInstantiationLineNumber(Begin);
100 if (StartLineNo > LineNo || SM.getFileID(Begin) != FID)
101 return; // No intersection.
103 unsigned EndLineNo = SM.getInstantiationLineNumber(End);
104 if (EndLineNo < LineNo || SM.getFileID(End) != FID)
105 return; // No intersection.
107 // Compute the column number of the start.
108 unsigned StartColNo = 0;
109 if (StartLineNo == LineNo) {
110 StartColNo = SM.getInstantiationColumnNumber(Begin);
111 if (StartColNo) --StartColNo; // Zero base the col #.
114 // Compute the column number of the end.
115 unsigned EndColNo = CaretLine.size();
116 if (EndLineNo == LineNo) {
117 EndColNo = SM.getInstantiationColumnNumber(End);
119 --EndColNo; // Zero base the col #.
121 // Add in the length of the token, so that we cover multi-char tokens if
122 // this is a token range.
123 if (R.isTokenRange())
124 EndColNo += Lexer::MeasureTokenLength(End, SM, *LangOpts);
126 EndColNo = CaretLine.size();
130 assert(StartColNo <= EndColNo && "Invalid range!");
132 // Check that a token range does not highlight only whitespace.
133 if (R.isTokenRange()) {
134 // Pick the first non-whitespace column.
135 while (StartColNo < SourceLine.size() &&
136 (SourceLine[StartColNo] == ' ' || SourceLine[StartColNo] == '\t'))
139 // Pick the last non-whitespace column.
140 if (EndColNo > SourceLine.size())
141 EndColNo = SourceLine.size();
143 (SourceLine[EndColNo-1] == ' ' || SourceLine[EndColNo-1] == '\t'))
146 // If the start/end passed each other, then we are trying to highlight a
147 // range that just exists in whitespace, which must be some sort of other
149 assert(StartColNo <= EndColNo && "Trying to highlight whitespace??");
152 // Fill the range with ~'s.
153 for (unsigned i = StartColNo; i < EndColNo; ++i)
157 /// \brief When the source code line we want to print is too long for
158 /// the terminal, select the "interesting" region.
159 static void SelectInterestingSourceRegion(std::string &SourceLine,
160 std::string &CaretLine,
161 std::string &FixItInsertionLine,
162 unsigned EndOfCaretToken,
164 unsigned MaxSize = std::max(SourceLine.size(),
165 std::max(CaretLine.size(),
166 FixItInsertionLine.size()));
167 if (MaxSize > SourceLine.size())
168 SourceLine.resize(MaxSize, ' ');
169 if (MaxSize > CaretLine.size())
170 CaretLine.resize(MaxSize, ' ');
171 if (!FixItInsertionLine.empty() && MaxSize > FixItInsertionLine.size())
172 FixItInsertionLine.resize(MaxSize, ' ');
174 // Find the slice that we need to display the full caret line
176 unsigned CaretStart = 0, CaretEnd = CaretLine.size();
177 for (; CaretStart != CaretEnd; ++CaretStart)
178 if (!isspace(CaretLine[CaretStart]))
181 for (; CaretEnd != CaretStart; --CaretEnd)
182 if (!isspace(CaretLine[CaretEnd - 1]))
185 // Make sure we don't chop the string shorter than the caret token
187 if (CaretEnd < EndOfCaretToken)
188 CaretEnd = EndOfCaretToken;
190 // If we have a fix-it line, make sure the slice includes all of the
191 // fix-it information.
192 if (!FixItInsertionLine.empty()) {
193 unsigned FixItStart = 0, FixItEnd = FixItInsertionLine.size();
194 for (; FixItStart != FixItEnd; ++FixItStart)
195 if (!isspace(FixItInsertionLine[FixItStart]))
198 for (; FixItEnd != FixItStart; --FixItEnd)
199 if (!isspace(FixItInsertionLine[FixItEnd - 1]))
202 if (FixItStart < CaretStart)
203 CaretStart = FixItStart;
204 if (FixItEnd > CaretEnd)
208 // CaretLine[CaretStart, CaretEnd) contains all of the interesting
209 // parts of the caret line. While this slice is smaller than the
210 // number of columns we have, try to grow the slice to encompass
213 // If the end of the interesting region comes before we run out of
214 // space in the terminal, start at the beginning of the line.
215 if (Columns > 3 && CaretEnd < Columns - 3)
218 unsigned TargetColumns = Columns;
219 if (TargetColumns > 8)
220 TargetColumns -= 8; // Give us extra room for the ellipses.
221 unsigned SourceLength = SourceLine.size();
222 while ((CaretEnd - CaretStart) < TargetColumns) {
223 bool ExpandedRegion = false;
224 // Move the start of the interesting region left until we've
225 // pulled in something else interesting.
228 else if (CaretStart > 1) {
229 unsigned NewStart = CaretStart - 1;
231 // Skip over any whitespace we see here; we're looking for
232 // another bit of interesting text.
233 while (NewStart && isspace(SourceLine[NewStart]))
236 // Skip over this bit of "interesting" text.
237 while (NewStart && !isspace(SourceLine[NewStart]))
240 // Move up to the non-whitespace character we just saw.
244 // If we're still within our limit, update the starting
245 // position within the source/caret line.
246 if (CaretEnd - NewStart <= TargetColumns) {
247 CaretStart = NewStart;
248 ExpandedRegion = true;
252 // Move the end of the interesting region right until we've
253 // pulled in something else interesting.
254 if (CaretEnd != SourceLength) {
255 assert(CaretEnd < SourceLength && "Unexpected caret position!");
256 unsigned NewEnd = CaretEnd;
258 // Skip over any whitespace we see here; we're looking for
259 // another bit of interesting text.
260 while (NewEnd != SourceLength && isspace(SourceLine[NewEnd - 1]))
263 // Skip over this bit of "interesting" text.
264 while (NewEnd != SourceLength && !isspace(SourceLine[NewEnd - 1]))
267 if (NewEnd - CaretStart <= TargetColumns) {
269 ExpandedRegion = true;
277 // [CaretStart, CaretEnd) is the slice we want. Update the various
278 // output lines to show only this slice, with two-space padding
279 // before the lines so that it looks nicer.
280 if (CaretEnd < SourceLine.size())
281 SourceLine.replace(CaretEnd, std::string::npos, "...");
282 if (CaretEnd < CaretLine.size())
283 CaretLine.erase(CaretEnd, std::string::npos);
284 if (FixItInsertionLine.size() > CaretEnd)
285 FixItInsertionLine.erase(CaretEnd, std::string::npos);
287 if (CaretStart > 2) {
288 SourceLine.replace(0, CaretStart, " ...");
289 CaretLine.replace(0, CaretStart, " ");
290 if (FixItInsertionLine.size() >= CaretStart)
291 FixItInsertionLine.replace(0, CaretStart, " ");
295 /// Look through spelling locations for a macro argument expansion, and
296 /// if found skip to it so that we can trace the argument rather than the macros
297 /// in which that argument is used. If no macro argument expansion is found,
298 /// don't skip anything and return the starting location.
299 static SourceLocation skipToMacroArgExpansion(const SourceManager &SM,
300 SourceLocation StartLoc) {
301 for (SourceLocation L = StartLoc; L.isMacroID();
302 L = SM.getImmediateSpellingLoc(L)) {
303 if (SM.isMacroArgInstantiation(L))
307 // Otherwise just return initial location, there's nothing to skip.
311 /// Gets the location of the immediate macro caller, one level up the stack
312 /// toward the initial macro typed into the source.
313 static SourceLocation getImmediateMacroCallerLoc(const SourceManager &SM,
314 SourceLocation Loc) {
315 if (!Loc.isMacroID()) return Loc;
317 // When we have the location of (part of) an expanded parameter, its spelling
318 // location points to the argument as typed into the macro call, and
319 // therefore is used to locate the macro caller.
320 if (SM.isMacroArgInstantiation(Loc))
321 return SM.getImmediateSpellingLoc(Loc);
323 // Otherwise, the caller of the macro is located where this macro is
324 // expanded (while the spelling is part of the macro definition).
325 return SM.getImmediateInstantiationRange(Loc).first;
328 /// Gets the location of the immediate macro callee, one level down the stack
329 /// toward the leaf macro.
330 static SourceLocation getImmediateMacroCalleeLoc(const SourceManager &SM,
331 SourceLocation Loc) {
332 if (!Loc.isMacroID()) return Loc;
334 // When we have the location of (part of) an expanded parameter, its
335 // expansion location points to the unexpanded paramater reference within
336 // the macro definition (or callee).
337 if (SM.isMacroArgInstantiation(Loc))
338 return SM.getImmediateInstantiationRange(Loc).first;
340 // Otherwise, the callee of the macro is located where this location was
341 // spelled inside the macro definition.
342 return SM.getImmediateSpellingLoc(Loc);
345 void TextDiagnosticPrinter::EmitCaretDiagnostic(SourceLocation Loc,
346 CharSourceRange *Ranges,
348 const SourceManager &SM,
349 const FixItHint *Hints,
352 unsigned OnMacroInst,
353 unsigned MacroSkipStart,
354 unsigned MacroSkipEnd) {
355 assert(LangOpts && "Unexpected diagnostic outside source file processing");
356 assert(!Loc.isInvalid() && "must have a valid source location here");
358 // If this is a macro ID, first emit information about where this was
359 // expanded (recursively) then emit information about where the token was
361 if (!Loc.isFileID()) {
362 // Whether to suppress printing this macro expansion.
364 = OnMacroInst >= MacroSkipStart && OnMacroInst < MacroSkipEnd;
366 // When processing macros, skip over the expansions leading up to
367 // a macro argument, and trace the argument's expansion stack instead.
368 Loc = skipToMacroArgExpansion(SM, Loc);
370 SourceLocation OneLevelUp = getImmediateMacroCallerLoc(SM, Loc);
372 // FIXME: Map ranges?
373 EmitCaretDiagnostic(OneLevelUp, Ranges, NumRanges, SM,
374 Hints, NumHints, Columns,
375 OnMacroInst + 1, MacroSkipStart, MacroSkipEnd);
378 Loc = getImmediateMacroCalleeLoc(SM, Loc);
381 for (unsigned i = 0; i != NumRanges; ++i) {
382 CharSourceRange &R = Ranges[i];
383 SourceLocation S = R.getBegin(), E = R.getEnd();
385 R.setBegin(getImmediateMacroCalleeLoc(SM, S));
387 R.setEnd(getImmediateMacroCalleeLoc(SM, E));
391 // Don't print recursive expansion notes from an expansion note.
392 Loc = SM.getSpellingLoc(Loc);
394 // Get the pretty name, according to #line directives etc.
395 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
396 if (PLoc.isInvalid())
399 // If this diagnostic is not in the main file, print out the
400 // "included from" lines.
401 if (LastWarningLoc != PLoc.getIncludeLoc()) {
402 LastWarningLoc = PLoc.getIncludeLoc();
403 PrintIncludeStack(Diagnostic::Note, LastWarningLoc, SM);
406 if (DiagOpts->ShowLocation) {
407 // Emit the file/line/column that this expansion came from.
408 OS << PLoc.getFilename() << ':' << PLoc.getLine() << ':';
409 if (DiagOpts->ShowColumn)
410 OS << PLoc.getColumn() << ':';
413 OS << "note: expanded from:\n";
415 EmitCaretDiagnostic(Loc, Ranges, NumRanges, SM, 0, 0,
416 Columns, OnMacroInst + 1, MacroSkipStart,
421 if (OnMacroInst == MacroSkipStart) {
422 // Tell the user that we've skipped contexts.
423 OS << "note: (skipping " << (MacroSkipEnd - MacroSkipStart)
424 << " expansions in backtrace; use -fmacro-backtrace-limit=0 to see "
431 // Decompose the location into a FID/Offset pair.
432 std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc);
433 FileID FID = LocInfo.first;
434 unsigned FileOffset = LocInfo.second;
436 // Get information about the buffer it points into.
437 bool Invalid = false;
438 const char *BufStart = SM.getBufferData(FID, &Invalid).data();
442 unsigned ColNo = SM.getColumnNumber(FID, FileOffset);
443 unsigned CaretEndColNo
444 = ColNo + Lexer::MeasureTokenLength(Loc, SM, *LangOpts);
446 // Rewind from the current position to the start of the line.
447 const char *TokPtr = BufStart+FileOffset;
448 const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.
451 // Compute the line end. Scan forward from the error position to the end of
453 const char *LineEnd = TokPtr;
454 while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
457 // FIXME: This shouldn't be necessary, but the CaretEndColNo can extend past
458 // the source line length as currently being computed. See
459 // test/Misc/message-length.c.
460 CaretEndColNo = std::min(CaretEndColNo, unsigned(LineEnd - LineStart));
462 // Copy the line of code into an std::string for ease of manipulation.
463 std::string SourceLine(LineStart, LineEnd);
465 // Create a line for the caret that is filled with spaces that is the same
466 // length as the line of source code.
467 std::string CaretLine(LineEnd-LineStart, ' ');
469 // Highlight all of the characters covered by Ranges with ~ characters.
471 unsigned LineNo = SM.getLineNumber(FID, FileOffset);
473 for (unsigned i = 0, e = NumRanges; i != e; ++i)
474 HighlightRange(Ranges[i], SM, LineNo, FID, CaretLine, SourceLine);
477 // Next, insert the caret itself.
478 if (ColNo-1 < CaretLine.size())
479 CaretLine[ColNo-1] = '^';
481 CaretLine.push_back('^');
483 // Scan the source line, looking for tabs. If we find any, manually expand
484 // them to spaces and update the CaretLine to match.
485 for (unsigned i = 0; i != SourceLine.size(); ++i) {
486 if (SourceLine[i] != '\t') continue;
488 // Replace this tab with at least one space.
491 // Compute the number of spaces we need to insert.
492 unsigned TabStop = DiagOpts->TabStop;
493 assert(0 < TabStop && TabStop <= DiagnosticOptions::MaxTabStop &&
494 "Invalid -ftabstop value");
495 unsigned NumSpaces = ((i+TabStop)/TabStop * TabStop) - (i+1);
496 assert(NumSpaces < TabStop && "Invalid computation of space amt");
498 // Insert spaces into the SourceLine.
499 SourceLine.insert(i+1, NumSpaces, ' ');
501 // Insert spaces or ~'s into CaretLine.
502 CaretLine.insert(i+1, NumSpaces, CaretLine[i] == '~' ? '~' : ' ');
505 // If we are in -fdiagnostics-print-source-range-info mode, we are trying to
506 // produce easily machine parsable output. Add a space before the source line
507 // and the caret to make it trivial to tell the main diagnostic line from what
508 // the user is intended to see.
509 if (DiagOpts->ShowSourceRanges) {
510 SourceLine = ' ' + SourceLine;
511 CaretLine = ' ' + CaretLine;
514 std::string FixItInsertionLine;
515 if (NumHints && DiagOpts->ShowFixits) {
516 for (const FixItHint *Hint = Hints, *LastHint = Hints + NumHints;
517 Hint != LastHint; ++Hint) {
518 if (!Hint->CodeToInsert.empty()) {
519 // We have an insertion hint. Determine whether the inserted
520 // code is on the same line as the caret.
521 std::pair<FileID, unsigned> HintLocInfo
522 = SM.getDecomposedInstantiationLoc(Hint->RemoveRange.getBegin());
523 if (SM.getLineNumber(HintLocInfo.first, HintLocInfo.second) ==
524 SM.getLineNumber(FID, FileOffset)) {
525 // Insert the new code into the line just below the code
526 // that the user wrote.
528 = SM.getColumnNumber(HintLocInfo.first, HintLocInfo.second);
529 unsigned LastColumnModified
530 = HintColNo - 1 + Hint->CodeToInsert.size();
531 if (LastColumnModified > FixItInsertionLine.size())
532 FixItInsertionLine.resize(LastColumnModified, ' ');
533 std::copy(Hint->CodeToInsert.begin(), Hint->CodeToInsert.end(),
534 FixItInsertionLine.begin() + HintColNo - 1);
536 FixItInsertionLine.clear();
541 // Now that we have the entire fixit line, expand the tabs in it.
542 // Since we don't want to insert spaces in the middle of a word,
543 // find each word and the column it should line up with and insert
544 // spaces until they match.
545 if (!FixItInsertionLine.empty()) {
546 unsigned FixItPos = 0;
547 unsigned LinePos = 0;
548 unsigned TabExpandedCol = 0;
549 unsigned LineLength = LineEnd - LineStart;
551 while (FixItPos < FixItInsertionLine.size() && LinePos < LineLength) {
552 // Find the next word in the FixIt line.
553 while (FixItPos < FixItInsertionLine.size() &&
554 FixItInsertionLine[FixItPos] == ' ')
556 unsigned CharDistance = FixItPos - TabExpandedCol;
558 // Walk forward in the source line, keeping track of
559 // the tab-expanded column.
560 for (unsigned I = 0; I < CharDistance; ++I, ++LinePos)
561 if (LinePos >= LineLength || LineStart[LinePos] != '\t')
565 (TabExpandedCol/DiagOpts->TabStop + 1) * DiagOpts->TabStop;
567 // Adjust the fixit line to match this column.
568 FixItInsertionLine.insert(FixItPos, TabExpandedCol-FixItPos, ' ');
569 FixItPos = TabExpandedCol;
571 // Walk to the end of the word.
572 while (FixItPos < FixItInsertionLine.size() &&
573 FixItInsertionLine[FixItPos] != ' ')
579 // If the source line is too long for our terminal, select only the
580 // "interesting" source region within that line.
581 if (Columns && SourceLine.size() > Columns)
582 SelectInterestingSourceRegion(SourceLine, CaretLine, FixItInsertionLine,
583 CaretEndColNo, Columns);
585 // Finally, remove any blank spaces from the end of CaretLine.
586 while (CaretLine[CaretLine.size()-1] == ' ')
587 CaretLine.erase(CaretLine.end()-1);
589 // Emit what we have computed.
590 OS << SourceLine << '\n';
592 if (DiagOpts->ShowColors)
593 OS.changeColor(caretColor, true);
594 OS << CaretLine << '\n';
595 if (DiagOpts->ShowColors)
598 if (!FixItInsertionLine.empty()) {
599 if (DiagOpts->ShowColors)
600 // Print fixit line in color
601 OS.changeColor(fixitColor, false);
602 if (DiagOpts->ShowSourceRanges)
604 OS << FixItInsertionLine << '\n';
605 if (DiagOpts->ShowColors)
609 if (DiagOpts->ShowParseableFixits) {
611 // We follow FixItRewriter's example in not (yet) handling
612 // fix-its in macros.
613 bool BadApples = false;
614 for (const FixItHint *Hint = Hints; Hint != Hints + NumHints; ++Hint) {
615 if (Hint->RemoveRange.isInvalid() ||
616 Hint->RemoveRange.getBegin().isMacroID() ||
617 Hint->RemoveRange.getEnd().isMacroID()) {
624 for (const FixItHint *Hint = Hints; Hint != Hints + NumHints; ++Hint) {
626 SourceLocation B = Hint->RemoveRange.getBegin();
627 SourceLocation E = Hint->RemoveRange.getEnd();
629 std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
630 std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);
632 // Adjust for token ranges.
633 if (Hint->RemoveRange.isTokenRange())
634 EInfo.second += Lexer::MeasureTokenLength(E, SM, *LangOpts);
636 // We specifically do not do word-wrapping or tab-expansion here,
637 // because this is supposed to be easy to parse.
638 PresumedLoc PLoc = SM.getPresumedLoc(B);
639 if (PLoc.isInvalid())
643 OS.write_escaped(SM.getPresumedLoc(B).getFilename());
644 OS << "\":{" << SM.getLineNumber(BInfo.first, BInfo.second)
645 << ':' << SM.getColumnNumber(BInfo.first, BInfo.second)
646 << '-' << SM.getLineNumber(EInfo.first, EInfo.second)
647 << ':' << SM.getColumnNumber(EInfo.first, EInfo.second)
649 OS.write_escaped(Hint->CodeToInsert);
656 /// \brief Skip over whitespace in the string, starting at the given
659 /// \returns The index of the first non-whitespace character that is
660 /// greater than or equal to Idx or, if no such character exists,
661 /// returns the end of the string.
662 static unsigned skipWhitespace(unsigned Idx,
663 const llvm::SmallVectorImpl<char> &Str,
665 while (Idx < Length && isspace(Str[Idx]))
670 /// \brief If the given character is the start of some kind of
671 /// balanced punctuation (e.g., quotes or parentheses), return the
672 /// character that will terminate the punctuation.
674 /// \returns The ending punctuation character, if any, or the NULL
675 /// character if the input character does not start any punctuation.
676 static inline char findMatchingPunctuation(char c) {
678 case '\'': return '\'';
679 case '`': return '\'';
680 case '"': return '"';
681 case '(': return ')';
682 case '[': return ']';
683 case '{': return '}';
690 /// \brief Find the end of the word starting at the given offset
693 /// \returns the index pointing one character past the end of the
695 static unsigned findEndOfWord(unsigned Start,
696 const llvm::SmallVectorImpl<char> &Str,
697 unsigned Length, unsigned Column,
699 assert(Start < Str.size() && "Invalid start position!");
700 unsigned End = Start + 1;
702 // If we are already at the end of the string, take that as the word.
703 if (End == Str.size())
706 // Determine if the start of the string is actually opening
707 // punctuation, e.g., a quote or parentheses.
708 char EndPunct = findMatchingPunctuation(Str[Start]);
710 // This is a normal word. Just find the first space character.
711 while (End < Length && !isspace(Str[End]))
716 // We have the start of a balanced punctuation sequence (quotes,
717 // parentheses, etc.). Determine the full sequence is.
718 llvm::SmallString<16> PunctuationEndStack;
719 PunctuationEndStack.push_back(EndPunct);
720 while (End < Length && !PunctuationEndStack.empty()) {
721 if (Str[End] == PunctuationEndStack.back())
722 PunctuationEndStack.pop_back();
723 else if (char SubEndPunct = findMatchingPunctuation(Str[End]))
724 PunctuationEndStack.push_back(SubEndPunct);
729 // Find the first space character after the punctuation ended.
730 while (End < Length && !isspace(Str[End]))
733 unsigned PunctWordLength = End - Start;
734 if (// If the word fits on this line
735 Column + PunctWordLength <= Columns ||
736 // ... or the word is "short enough" to take up the next line
737 // without too much ugly white space
738 PunctWordLength < Columns/3)
739 return End; // Take the whole thing as a single "word".
741 // The whole quoted/parenthesized string is too long to print as a
742 // single "word". Instead, find the "word" that starts just after
743 // the punctuation and use that end-point instead. This will recurse
744 // until it finds something small enough to consider a word.
745 return findEndOfWord(Start + 1, Str, Length, Column + 1, Columns);
748 /// \brief Print the given string to a stream, word-wrapping it to
749 /// some number of columns in the process.
751 /// \brief OS the stream to which the word-wrapping string will be
754 /// \brief Str the string to word-wrap and output.
756 /// \brief Columns the number of columns to word-wrap to.
758 /// \brief Column the column number at which the first character of \p
759 /// Str will be printed. This will be non-zero when part of the first
760 /// line has already been printed.
762 /// \brief Indentation the number of spaces to indent any lines beyond
765 /// \returns true if word-wrapping was required, or false if the
766 /// string fit on the first line.
767 static bool PrintWordWrapped(llvm::raw_ostream &OS,
768 const llvm::SmallVectorImpl<char> &Str,
771 unsigned Indentation = WordWrapIndentation) {
772 unsigned Length = Str.size();
774 // If there is a newline in this message somewhere, find that
775 // newline and split the message into the part before the newline
776 // (which will be word-wrapped) and the part from the newline one
777 // (which will be emitted unchanged).
778 for (unsigned I = 0; I != Length; ++I)
779 if (Str[I] == '\n') {
784 // The string used to indent each line.
785 llvm::SmallString<16> IndentStr;
786 IndentStr.assign(Indentation, ' ');
787 bool Wrapped = false;
788 for (unsigned WordStart = 0, WordEnd; WordStart < Length;
789 WordStart = WordEnd) {
790 // Find the beginning of the next word.
791 WordStart = skipWhitespace(WordStart, Str, Length);
792 if (WordStart == Length)
795 // Find the end of this word.
796 WordEnd = findEndOfWord(WordStart, Str, Length, Column, Columns);
798 // Does this word fit on the current line?
799 unsigned WordLength = WordEnd - WordStart;
800 if (Column + WordLength < Columns) {
801 // This word fits on the current line; print it there.
806 OS.write(&Str[WordStart], WordLength);
807 Column += WordLength;
811 // This word does not fit on the current line, so wrap to the next
814 OS.write(&IndentStr[0], Indentation);
815 OS.write(&Str[WordStart], WordLength);
816 Column = Indentation + WordLength;
820 if (Length == Str.size())
821 return Wrapped; // We're done.
823 // There is a newline in the message, followed by something that
824 // will not be word-wrapped. Print that.
825 OS.write(&Str[Length], Str.size() - Length);
829 /// Get the presumed location of a diagnostic message. This computes the
830 /// presumed location for the top of any macro backtrace when present.
831 static PresumedLoc getDiagnosticPresumedLoc(const SourceManager &SM,
832 SourceLocation Loc) {
833 // This is a condensed form of the algorithm used by EmitCaretDiagnostic to
834 // walk to the top of the macro call stack.
835 while (Loc.isMacroID()) {
836 Loc = skipToMacroArgExpansion(SM, Loc);
837 Loc = getImmediateMacroCallerLoc(SM, Loc);
840 return SM.getPresumedLoc(Loc);
843 void TextDiagnosticPrinter::HandleDiagnostic(Diagnostic::Level Level,
844 const DiagnosticInfo &Info) {
845 // Default implementation (Warnings/errors count).
846 DiagnosticClient::HandleDiagnostic(Level, Info);
848 // Keeps track of the the starting position of the location
849 // information (e.g., "foo.c:10:4:") that precedes the error
850 // message. We use this information to determine how long the
851 // file+line+column number prefix is.
852 uint64_t StartOfLocationInfo = OS.tell();
855 OS << Prefix << ": ";
857 // If the location is specified, print out a file/line/col and include trace
859 if (Info.getLocation().isValid()) {
860 const SourceManager &SM = Info.getSourceManager();
861 PresumedLoc PLoc = getDiagnosticPresumedLoc(SM, Info.getLocation());
862 if (PLoc.isInvalid()) {
863 // At least print the file name if available:
864 FileID FID = SM.getFileID(Info.getLocation());
865 if (!FID.isInvalid()) {
866 const FileEntry* FE = SM.getFileEntryForID(FID);
867 if (FE && FE->getName()) {
869 if (FE->getDevice() == 0 && FE->getInode() == 0
870 && FE->getFileMode() == 0) {
871 // in PCH is a guess, but a good one:
878 unsigned LineNo = PLoc.getLine();
880 // First, if this diagnostic is not in the main file, print out the
881 // "included from" lines.
882 if (LastWarningLoc != PLoc.getIncludeLoc()) {
883 LastWarningLoc = PLoc.getIncludeLoc();
884 PrintIncludeStack(Level, LastWarningLoc, SM);
885 StartOfLocationInfo = OS.tell();
888 // Compute the column number.
889 if (DiagOpts->ShowLocation) {
890 if (DiagOpts->ShowColors)
891 OS.changeColor(savedColor, true);
893 OS << PLoc.getFilename();
894 switch (DiagOpts->Format) {
895 case DiagnosticOptions::Clang: OS << ':' << LineNo; break;
896 case DiagnosticOptions::Msvc: OS << '(' << LineNo; break;
897 case DiagnosticOptions::Vi: OS << " +" << LineNo; break;
899 if (DiagOpts->ShowColumn)
900 if (unsigned ColNo = PLoc.getColumn()) {
901 if (DiagOpts->Format == DiagnosticOptions::Msvc) {
908 switch (DiagOpts->Format) {
909 case DiagnosticOptions::Clang:
910 case DiagnosticOptions::Vi: OS << ':'; break;
911 case DiagnosticOptions::Msvc: OS << ") : "; break;
915 if (DiagOpts->ShowSourceRanges && Info.getNumRanges()) {
917 SM.getFileID(SM.getInstantiationLoc(Info.getLocation()));
918 bool PrintedRange = false;
920 for (unsigned i = 0, e = Info.getNumRanges(); i != e; ++i) {
921 // Ignore invalid ranges.
922 if (!Info.getRange(i).isValid()) continue;
924 SourceLocation B = Info.getRange(i).getBegin();
925 SourceLocation E = Info.getRange(i).getEnd();
926 B = SM.getInstantiationLoc(B);
927 E = SM.getInstantiationLoc(E);
929 // If the End location and the start location are the same and are a
930 // macro location, then the range was something that came from a
931 // macro expansion or _Pragma. If this is an object-like macro, the
932 // best we can do is to highlight the range. If this is a
933 // function-like macro, we'd also like to highlight the arguments.
934 if (B == E && Info.getRange(i).getEnd().isMacroID())
935 E = SM.getInstantiationRange(Info.getRange(i).getEnd()).second;
937 std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
938 std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);
940 // If the start or end of the range is in another file, just discard
942 if (BInfo.first != CaretFileID || EInfo.first != CaretFileID)
945 // Add in the length of the token, so that we cover multi-char
947 unsigned TokSize = 0;
948 if (Info.getRange(i).isTokenRange())
949 TokSize = Lexer::MeasureTokenLength(E, SM, *LangOpts);
951 OS << '{' << SM.getLineNumber(BInfo.first, BInfo.second) << ':'
952 << SM.getColumnNumber(BInfo.first, BInfo.second) << '-'
953 << SM.getLineNumber(EInfo.first, EInfo.second) << ':'
954 << (SM.getColumnNumber(EInfo.first, EInfo.second)+TokSize)
964 if (DiagOpts->ShowColors)
969 if (DiagOpts->ShowColors) {
970 // Print diagnostic category in bold and color
972 case Diagnostic::Ignored: assert(0 && "Invalid diagnostic type");
973 case Diagnostic::Note: OS.changeColor(noteColor, true); break;
974 case Diagnostic::Warning: OS.changeColor(warningColor, true); break;
975 case Diagnostic::Error: OS.changeColor(errorColor, true); break;
976 case Diagnostic::Fatal: OS.changeColor(fatalColor, true); break;
981 case Diagnostic::Ignored: assert(0 && "Invalid diagnostic type");
982 case Diagnostic::Note: OS << "note: "; break;
983 case Diagnostic::Warning: OS << "warning: "; break;
984 case Diagnostic::Error: OS << "error: "; break;
985 case Diagnostic::Fatal: OS << "fatal error: "; break;
988 if (DiagOpts->ShowColors)
991 llvm::SmallString<100> OutStr;
992 Info.FormatDiagnostic(OutStr);
994 if (DiagOpts->ShowNames &&
995 !DiagnosticIDs::isBuiltinNote(Info.getID())) {
997 OutStr += DiagnosticIDs::getName(Info.getID());
1001 std::string OptionName;
1002 if (DiagOpts->ShowOptionNames) {
1003 // Was this a warning mapped to an error using -Werror or pragma?
1004 if (Level == Diagnostic::Error &&
1005 DiagnosticIDs::isBuiltinWarningOrExtension(Info.getID())) {
1006 diag::Mapping mapping = diag::MAP_IGNORE;
1007 Info.getDiags()->getDiagnosticLevel(Info.getID(), Info.getLocation(),
1009 if (mapping == diag::MAP_WARNING)
1010 OptionName += "-Werror";
1013 llvm::StringRef Opt = DiagnosticIDs::getWarningOptionForDiag(Info.getID());
1015 if (!OptionName.empty())
1019 } else if (Info.getID() == diag::fatal_too_many_errors) {
1020 OptionName = "-ferror-limit=";
1022 // If the diagnostic is an extension diagnostic and not enabled by default
1023 // then it must have been turned on with -pedantic.
1024 bool EnabledByDefault;
1025 if (DiagnosticIDs::isBuiltinExtensionDiag(Info.getID(),
1026 EnabledByDefault) &&
1028 OptionName = "-pedantic";
1032 // If the user wants to see category information, include it too.
1033 unsigned DiagCategory = 0;
1034 if (DiagOpts->ShowCategories)
1035 DiagCategory = DiagnosticIDs::getCategoryNumberForDiag(Info.getID());
1037 // If there is any categorization information, include it.
1038 if (!OptionName.empty() || DiagCategory != 0) {
1039 bool NeedsComma = false;
1042 if (!OptionName.empty()) {
1043 OutStr += OptionName;
1048 if (NeedsComma) OutStr += ',';
1049 if (DiagOpts->ShowCategories == 1)
1050 OutStr += llvm::utostr(DiagCategory);
1052 assert(DiagOpts->ShowCategories == 2 && "Invalid ShowCategories value");
1053 OutStr += DiagnosticIDs::getCategoryNameFromID(DiagCategory);
1061 if (DiagOpts->ShowColors) {
1062 // Print warnings, errors and fatal errors in bold, no color
1064 case Diagnostic::Warning: OS.changeColor(savedColor, true); break;
1065 case Diagnostic::Error: OS.changeColor(savedColor, true); break;
1066 case Diagnostic::Fatal: OS.changeColor(savedColor, true); break;
1067 default: break; //don't bold notes
1071 if (DiagOpts->MessageLength) {
1072 // We will be word-wrapping the error message, so compute the
1073 // column number where we currently are (after printing the
1074 // location information).
1075 unsigned Column = OS.tell() - StartOfLocationInfo;
1076 PrintWordWrapped(OS, OutStr, DiagOpts->MessageLength, Column);
1078 OS.write(OutStr.begin(), OutStr.size());
1081 if (DiagOpts->ShowColors)
1084 // If caret diagnostics are enabled and we have location, we want to
1085 // emit the caret. However, we only do this if the location moved
1086 // from the last diagnostic, if the last diagnostic was a note that
1087 // was part of a different warning or error diagnostic, or if the
1088 // diagnostic has ranges. We don't want to emit the same caret
1089 // multiple times if one loc has multiple diagnostics.
1090 if (DiagOpts->ShowCarets && Info.getLocation().isValid() &&
1091 ((LastLoc != Info.getLocation()) || Info.getNumRanges() ||
1092 (LastCaretDiagnosticWasNote && Level != Diagnostic::Note) ||
1093 Info.getNumFixItHints())) {
1094 // Cache the LastLoc, it allows us to omit duplicate source/caret spewage.
1095 LastLoc = FullSourceLoc(Info.getLocation(), Info.getSourceManager());
1096 LastCaretDiagnosticWasNote = (Level == Diagnostic::Note);
1098 // Get the ranges into a local array we can hack on.
1099 CharSourceRange Ranges[20];
1100 unsigned NumRanges = Info.getNumRanges();
1101 assert(NumRanges < 20 && "Out of space");
1102 for (unsigned i = 0; i != NumRanges; ++i)
1103 Ranges[i] = Info.getRange(i);
1105 unsigned NumHints = Info.getNumFixItHints();
1106 for (unsigned i = 0; i != NumHints; ++i) {
1107 const FixItHint &Hint = Info.getFixItHint(i);
1108 if (Hint.RemoveRange.isValid()) {
1109 assert(NumRanges < 20 && "Out of space");
1110 Ranges[NumRanges++] = Hint.RemoveRange;
1114 const SourceManager &SM = LastLoc.getManager();
1115 unsigned MacroInstSkipStart = 0, MacroInstSkipEnd = 0;
1116 if (DiagOpts && DiagOpts->MacroBacktraceLimit && !LastLoc.isFileID()) {
1117 // Compute the length of the macro-expansion backtrace, so that we
1118 // can establish which steps in the macro backtrace we'll skip.
1119 SourceLocation Loc = LastLoc;
1123 Loc = skipToMacroArgExpansion(SM, Loc);
1124 Loc = getImmediateMacroCallerLoc(SM, Loc);
1125 } while (!Loc.isFileID());
1127 if (Depth > DiagOpts->MacroBacktraceLimit) {
1128 MacroInstSkipStart = DiagOpts->MacroBacktraceLimit / 2 +
1129 DiagOpts->MacroBacktraceLimit % 2;
1130 MacroInstSkipEnd = Depth - DiagOpts->MacroBacktraceLimit / 2;
1134 EmitCaretDiagnostic(LastLoc, Ranges, NumRanges, LastLoc.getManager(),
1135 Info.getFixItHints(),
1136 Info.getNumFixItHints(),
1137 DiagOpts->MessageLength,
1138 0, MacroInstSkipStart, MacroInstSkipEnd);