C++ SourceManager::getColumnNumber方法代码示例

void TextDiagnostic::emitParseableFixits(ArrayRef<FixItHint> Hints,
                                         const SourceManager &SM) {
  if (!DiagOpts->ShowParseableFixits)
    return;

  // We follow FixItRewriter's example in not (yet) handling
  // fix-its in macros.
  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
       I != E; ++I) {
    if (I->RemoveRange.isInvalid() ||
        I->RemoveRange.getBegin().isMacroID() ||
        I->RemoveRange.getEnd().isMacroID())
      return;
  }

  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
       I != E; ++I) {
    SourceLocation BLoc = I->RemoveRange.getBegin();
    SourceLocation ELoc = I->RemoveRange.getEnd();

    std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(BLoc);
    std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(ELoc);

    // Adjust for token ranges.
    if (I->RemoveRange.isTokenRange())
      EInfo.second += Lexer::MeasureTokenLength(ELoc, SM, LangOpts);

    // We specifically do not do word-wrapping or tab-expansion here,
    // because this is supposed to be easy to parse.
    PresumedLoc PLoc = SM.getPresumedLoc(BLoc);
    if (PLoc.isInvalid())
      break;

    OS << "fix-it:\"";
    OS.write_escaped(PLoc.getFilename());
    OS << "\":{" << SM.getLineNumber(BInfo.first, BInfo.second)
      << ':' << SM.getColumnNumber(BInfo.first, BInfo.second)
      << '-' << SM.getLineNumber(EInfo.first, EInfo.second)
      << ':' << SM.getColumnNumber(EInfo.first, EInfo.second)
      << "}:\"";
    OS.write_escaped(I->CodeToInsert);
    OS << "\"\n";
  }
}

static std::string buildFixItInsertionLine(unsigned LineNo,
                                           const SourceColumnMap &map,
                                           ArrayRef<FixItHint> Hints,
                                           const SourceManager &SM,
                                           const DiagnosticOptions *DiagOpts) {
  std::string FixItInsertionLine;
  if (Hints.empty() || !DiagOpts->ShowFixits)
    return FixItInsertionLine;
  unsigned PrevHintEndCol = 0;

  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
       I != E; ++I) {
    if (!I->CodeToInsert.empty()) {
      // We have an insertion hint. Determine whether the inserted
      // code contains no newlines and is on the same line as the caret.
      std::pair<FileID, unsigned> HintLocInfo
        = SM.getDecomposedExpansionLoc(I->RemoveRange.getBegin());
      if (LineNo == SM.getLineNumber(HintLocInfo.first, HintLocInfo.second) &&
          StringRef(I->CodeToInsert).find_first_of("\n\r") == StringRef::npos) {
        // Insert the new code into the line just below the code
        // that the user wrote.
        // Note: When modifying this function, be very careful about what is a
        // "column" (printed width, platform-dependent) and what is a
        // "byte offset" (SourceManager "column").
        unsigned HintByteOffset
          = SM.getColumnNumber(HintLocInfo.first, HintLocInfo.second) - 1;

        // The hint must start inside the source or right at the end
        assert(HintByteOffset < static_cast<unsigned>(map.bytes())+1);
        unsigned HintCol = map.byteToContainingColumn(HintByteOffset);

        // If we inserted a long previous hint, push this one forwards, and add
        // an extra space to show that this is not part of the previous
        // completion. This is sort of the best we can do when two hints appear
        // to overlap.
        //
        // Note that if this hint is located immediately after the previous
        // hint, no space will be added, since the location is more important.
        if (HintCol < PrevHintEndCol)
          HintCol = PrevHintEndCol + 1;

        // FIXME: This function handles multibyte characters in the source, but
        // not in the fixits. This assertion is intended to catch unintended
        // use of multibyte characters in fixits. If we decide to do this, we'll
        // have to track separate byte widths for the source and fixit lines.
        assert((size_t)llvm::sys::locale::columnWidth(I->CodeToInsert) ==
               I->CodeToInsert.size());

        // This relies on one byte per column in our fixit hints.
        // This should NOT use HintByteOffset, because the source might have
        // Unicode characters in earlier columns.
        unsigned LastColumnModified = HintCol + I->CodeToInsert.size();
        if (LastColumnModified > FixItInsertionLine.size())
          FixItInsertionLine.resize(LastColumnModified, ' ');

        std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
                  FixItInsertionLine.begin() + HintCol);

        PrevHintEndCol = LastColumnModified;
      } else {
        FixItInsertionLine.clear();
        break;
      }
    }
  }

  expandTabs(FixItInsertionLine, DiagOpts->TabStop);

  return FixItInsertionLine;
}

/// \brief Print out the file/line/column information and include trace.
///
/// This method handlen the emission of the diagnostic location information.
/// This includes extracting as much location information as is present for
/// the diagnostic and printing it, as well as any include stack or source
/// ranges necessary.
void TextDiagnostic::emitDiagnosticLoc(SourceLocation Loc, PresumedLoc PLoc,
                                       DiagnosticsEngine::Level Level,
                                       ArrayRef<CharSourceRange> Ranges,
                                       const SourceManager &SM) {
  if (PLoc.isInvalid()) {
    // At least print the file name if available:
    FileID FID = SM.getFileID(Loc);
    if (!FID.isInvalid()) {
      const FileEntry* FE = SM.getFileEntryForID(FID);
      if (FE && FE->getName()) {
        OS << FE->getName();
        if (FE->getDevice() == 0 && FE->getInode() == 0
            && FE->getFileMode() == 0) {
          // in PCH is a guess, but a good one:
          OS << " (in PCH)";
        }
        OS << ": ";
      }
    }
    return;
  }
  unsigned LineNo = PLoc.getLine();

  if (!DiagOpts->ShowLocation)
    return;

  if (DiagOpts->ShowColors)
    OS.changeColor(savedColor, true);

  OS << PLoc.getFilename();
  switch (DiagOpts->getFormat()) {
  case DiagnosticOptions::LFort: OS << ':'  << LineNo; break;
  case DiagnosticOptions::Msvc:  OS << '('  << LineNo; break;
  case DiagnosticOptions::Vi:    OS << " +" << LineNo; break;
  }

  if (DiagOpts->ShowColumn)
    // Compute the column number.
    if (unsigned ColNo = PLoc.getColumn()) {
      if (DiagOpts->getFormat() == DiagnosticOptions::Msvc) {
        OS << ',';
        ColNo--;
      } else
        OS << ':';
      OS << ColNo;
    }
  switch (DiagOpts->getFormat()) {
  case DiagnosticOptions::LFort:
  case DiagnosticOptions::Vi:    OS << ':';    break;
  case DiagnosticOptions::Msvc:  OS << ") : "; break;
  }

  if (DiagOpts->ShowSourceRanges && !Ranges.empty()) {
    FileID CaretFileID =
      SM.getFileID(SM.getExpansionLoc(Loc));
    bool PrintedRange = false;

    for (ArrayRef<CharSourceRange>::const_iterator RI = Ranges.begin(),
         RE = Ranges.end();
         RI != RE; ++RI) {
      // Ignore invalid ranges.
      if (!RI->isValid()) continue;

      SourceLocation B = SM.getExpansionLoc(RI->getBegin());
      SourceLocation E = SM.getExpansionLoc(RI->getEnd());

      // If the End location and the start location are the same and are a
      // macro location, then the range was something that came from a
      // macro expansion or _Pragma.  If this is an object-like macro, the
      // best we can do is to highlight the range.  If this is a
      // function-like macro, we'd also like to highlight the arguments.
      if (B == E && RI->getEnd().isMacroID())
        E = SM.getExpansionRange(RI->getEnd()).second;

      std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
      std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);

      // If the start or end of the range is in another file, just discard
      // it.
      if (BInfo.first != CaretFileID || EInfo.first != CaretFileID)
        continue;

      // Add in the length of the token, so that we cover multi-char
      // tokens.
      unsigned TokSize = 0;
      if (RI->isTokenRange())
        TokSize = Lexer::MeasureTokenLength(E, SM, LangOpts);

      OS << '{' << SM.getLineNumber(BInfo.first, BInfo.second) << ':'
        << SM.getColumnNumber(BInfo.first, BInfo.second) << '-'
        << SM.getLineNumber(EInfo.first, EInfo.second) << ':'
        << (SM.getColumnNumber(EInfo.first, EInfo.second)+TokSize)
        << '}';
      PrintedRange = true;
//.........这里部分代码省略.........

/// \brief Emit a code snippet and caret line.
///
/// This routine emits a single line's code snippet and caret line..
///
/// \param Loc The location for the caret.
/// \param Ranges The underlined ranges for this code snippet.
/// \param Hints The FixIt hints active for this diagnostic.
void TextDiagnostic::emitSnippetAndCaret(
    SourceLocation Loc, DiagnosticsEngine::Level Level,
    SmallVectorImpl<CharSourceRange>& Ranges,
    ArrayRef<FixItHint> Hints,
    const SourceManager &SM) {
  assert(!Loc.isInvalid() && "must have a valid source location here");
  assert(Loc.isFileID() && "must have a file location here");

  // If caret diagnostics are enabled and we have location, we want to
  // emit the caret.  However, we only do this if the location moved
  // from the last diagnostic, if the last diagnostic was a note that
  // was part of a different warning or error diagnostic, or if the
  // diagnostic has ranges.  We don't want to emit the same caret
  // multiple times if one loc has multiple diagnostics.
  if (!DiagOpts->ShowCarets)
    return;
  if (Loc == LastLoc && Ranges.empty() && Hints.empty() &&
      (LastLevel != DiagnosticsEngine::Note || Level == LastLevel))
    return;

  // Decompose the location into a FID/Offset pair.
  std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc);
  FileID FID = LocInfo.first;
  unsigned FileOffset = LocInfo.second;

  // Get information about the buffer it points into.
  bool Invalid = false;
  const char *BufStart = SM.getBufferData(FID, &Invalid).data();
  if (Invalid)
    return;

  unsigned LineNo = SM.getLineNumber(FID, FileOffset);
  unsigned ColNo = SM.getColumnNumber(FID, FileOffset);

  // Rewind from the current position to the start of the line.
  const char *TokPtr = BufStart+FileOffset;
  const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.


  // Compute the line end.  Scan forward from the error position to the end of
  // the line.
  const char *LineEnd = TokPtr;
  while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
    ++LineEnd;

  // Copy the line of code into an std::string for ease of manipulation.
  std::string SourceLine(LineStart, LineEnd);

  // Create a line for the caret that is filled with spaces that is the same
  // length as the line of source code.
  std::string CaretLine(LineEnd-LineStart, ' ');

  const SourceColumnMap sourceColMap(SourceLine, DiagOpts->TabStop);

  // Highlight all of the characters covered by Ranges with ~ characters.
  for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
                                                  E = Ranges.end();
       I != E; ++I)
    highlightRange(*I, LineNo, FID, sourceColMap, CaretLine, SM, LangOpts);

  // Next, insert the caret itself.
  ColNo = sourceColMap.byteToContainingColumn(ColNo-1);
  if (CaretLine.size()<ColNo+1)
    CaretLine.resize(ColNo+1, ' ');
  CaretLine[ColNo] = '^';

  std::string FixItInsertionLine = buildFixItInsertionLine(LineNo,
                                                           sourceColMap,
                                                           Hints, SM,
                                                           DiagOpts.getPtr());

  // If the source line is too long for our terminal, select only the
  // "interesting" source region within that line.
  unsigned Columns = DiagOpts->MessageLength;
  if (Columns)
    selectInterestingSourceRegion(SourceLine, CaretLine, FixItInsertionLine,
                                  Columns, sourceColMap);

  // If we are in -fdiagnostics-print-source-range-info mode, we are trying
  // to produce easily machine parsable output.  Add a space before the
  // source line and the caret to make it trivial to tell the main diagnostic
  // line from what the user is intended to see.
  if (DiagOpts->ShowSourceRanges) {
    SourceLine = ' ' + SourceLine;
    CaretLine = ' ' + CaretLine;
  }

  // Finally, remove any blank spaces from the end of CaretLine.
  while (CaretLine[CaretLine.size()-1] == ' ')
    CaretLine.erase(CaretLine.end()-1);

  // Emit what we have computed.
  emitSnippet(SourceLine);
//.........这里部分代码省略.........

void TextDiagnosticPrinter::EmitCaretDiagnostic(SourceLocation Loc,
                                                SourceRange *Ranges,
                                                unsigned NumRanges,
                                                SourceManager &SM,
                                          const CodeModificationHint *Hints,
                                                unsigned NumHints,
                                                unsigned Columns) {
  assert(LangOpts && "Unexpected diagnostic outside source file processing");
  assert(!Loc.isInvalid() && "must have a valid source location here");

  // If this is a macro ID, first emit information about where this was
  // instantiated (recursively) then emit information about where the token was
  // spelled from.
  if (!Loc.isFileID()) {
    SourceLocation OneLevelUp = SM.getImmediateInstantiationRange(Loc).first;
    // FIXME: Map ranges?
    EmitCaretDiagnostic(OneLevelUp, Ranges, NumRanges, SM, 0, 0, Columns);

    // Map the location.
    Loc = SM.getImmediateSpellingLoc(Loc);

    // Map the ranges.
    for (unsigned i = 0; i != NumRanges; ++i) {
      SourceLocation S = Ranges[i].getBegin(), E = Ranges[i].getEnd();
      if (S.isMacroID()) S = SM.getImmediateSpellingLoc(S);
      if (E.isMacroID()) E = SM.getImmediateSpellingLoc(E);
      Ranges[i] = SourceRange(S, E);
    }
    
    // Get the pretty name, according to #line directives etc.
    PresumedLoc PLoc = SM.getPresumedLoc(Loc);
    
    // If this diagnostic is not in the main file, print out the "included from"
    // lines.
    if (LastWarningLoc != PLoc.getIncludeLoc()) {
      LastWarningLoc = PLoc.getIncludeLoc();
      PrintIncludeStack(LastWarningLoc, SM);
    }

    if (DiagOpts->ShowLocation) {
      // Emit the file/line/column that this expansion came from.
      OS << PLoc.getFilename() << ':' << PLoc.getLine() << ':';
      if (DiagOpts->ShowColumn)
        OS << PLoc.getColumn() << ':';
      OS << ' ';
    }
    OS << "note: instantiated from:\n";

    EmitCaretDiagnostic(Loc, Ranges, NumRanges, SM, Hints, NumHints, Columns);
    return;
  }

  // Decompose the location into a FID/Offset pair.
  std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc);
  FileID FID = LocInfo.first;
  unsigned FileOffset = LocInfo.second;

  // Get information about the buffer it points into.
  std::pair<const char*, const char*> BufferInfo = SM.getBufferData(FID);
  const char *BufStart = BufferInfo.first;

  unsigned ColNo = SM.getColumnNumber(FID, FileOffset);
  unsigned CaretEndColNo
    = ColNo + Lexer::MeasureTokenLength(Loc, SM, *LangOpts);

  // Rewind from the current position to the start of the line.
  const char *TokPtr = BufStart+FileOffset;
  const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.


  // Compute the line end.  Scan forward from the error position to the end of
  // the line.
  const char *LineEnd = TokPtr;
  while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
    ++LineEnd;

  // FIXME: This shouldn't be necessary, but the CaretEndColNo can extend past
  // the source line length as currently being computed. See
  // test/Misc/message-length.c.
  CaretEndColNo = std::min(CaretEndColNo, unsigned(LineEnd - LineStart));

  // Copy the line of code into an std::string for ease of manipulation.
  std::string SourceLine(LineStart, LineEnd);

  // Create a line for the caret that is filled with spaces that is the same
  // length as the line of source code.
  std::string CaretLine(LineEnd-LineStart, ' ');

  // Highlight all of the characters covered by Ranges with ~ characters.
  if (NumRanges) {
    unsigned LineNo = SM.getLineNumber(FID, FileOffset);

    for (unsigned i = 0, e = NumRanges; i != e; ++i)
      HighlightRange(Ranges[i], SM, LineNo, FID, CaretLine, SourceLine);
  }

  // Next, insert the caret itself.
  if (ColNo-1 < CaretLine.size())
    CaretLine[ColNo-1] = '^';
  else
//.........这里部分代码省略.........

void TextDiagnosticPrinter::EmitCaretDiagnostic(SourceLocation Loc,
                                                SourceRange *Ranges,
                                                unsigned NumRanges,
                                                SourceManager &SM,
                                          const CodeModificationHint *Hints,
                                                unsigned NumHints,
                                                unsigned Columns) {
  assert(!Loc.isInvalid() && "must have a valid source location here");

  // If this is a macro ID, first emit information about where this was
  // instantiated (recursively) then emit information about where. the token was
  // spelled from.
  if (!Loc.isFileID()) {
    SourceLocation OneLevelUp = SM.getImmediateInstantiationRange(Loc).first;
    // FIXME: Map ranges?
    EmitCaretDiagnostic(OneLevelUp, Ranges, NumRanges, SM, 0, 0, Columns);

    Loc = SM.getImmediateSpellingLoc(Loc);
    
    // Map the ranges.
    for (unsigned i = 0; i != NumRanges; ++i) {
      SourceLocation S = Ranges[i].getBegin(), E = Ranges[i].getEnd();
      if (S.isMacroID()) S = SM.getImmediateSpellingLoc(S);
      if (E.isMacroID()) E = SM.getImmediateSpellingLoc(E);
      Ranges[i] = SourceRange(S, E);
    }
    
    if (ShowLocation) {
      std::pair<FileID, unsigned> IInfo = SM.getDecomposedInstantiationLoc(Loc);
      
      // Emit the file/line/column that this expansion came from.
      OS << SM.getBuffer(IInfo.first)->getBufferIdentifier() << ':'
         << SM.getLineNumber(IInfo.first, IInfo.second) << ':';
      if (ShowColumn)
        OS << SM.getColumnNumber(IInfo.first, IInfo.second) << ':';
      OS << ' ';
    }
    OS << "note: instantiated from:\n";
    
    EmitCaretDiagnostic(Loc, Ranges, NumRanges, SM, Hints, NumHints, Columns);
    return;
  }
  
  // Decompose the location into a FID/Offset pair.
  std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc);
  FileID FID = LocInfo.first;
  unsigned FileOffset = LocInfo.second;
  
  // Get information about the buffer it points into.
  std::pair<const char*, const char*> BufferInfo = SM.getBufferData(FID);
  const char *BufStart = BufferInfo.first;

  unsigned ColNo = SM.getColumnNumber(FID, FileOffset);
  unsigned CaretEndColNo 
    = ColNo + Lexer::MeasureTokenLength(Loc, SM, *LangOpts);

  // Rewind from the current position to the start of the line.
  const char *TokPtr = BufStart+FileOffset;
  const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.
  
  
  // Compute the line end.  Scan forward from the error position to the end of
  // the line.
  const char *LineEnd = TokPtr;
  while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
    ++LineEnd;
  
  // Copy the line of code into an std::string for ease of manipulation.
  std::string SourceLine(LineStart, LineEnd);
  
  // Create a line for the caret that is filled with spaces that is the same
  // length as the line of source code.
  std::string CaretLine(LineEnd-LineStart, ' ');
  
  // Highlight all of the characters covered by Ranges with ~ characters.
  if (NumRanges) {
    unsigned LineNo = SM.getLineNumber(FID, FileOffset);
    
    for (unsigned i = 0, e = NumRanges; i != e; ++i)
      HighlightRange(Ranges[i], SM, LineNo, FID, CaretLine, SourceLine);
  }
  
  // Next, insert the caret itself.
  if (ColNo-1 < CaretLine.size())
    CaretLine[ColNo-1] = '^';
  else
    CaretLine.push_back('^');
  
  // Scan the source line, looking for tabs.  If we find any, manually expand
  // them to 8 characters and update the CaretLine to match.
  for (unsigned i = 0; i != SourceLine.size(); ++i) {
    if (SourceLine[i] != '\t') continue;
    
    // Replace this tab with at least one space.
    SourceLine[i] = ' ';
    
    // Compute the number of spaces we need to insert.
    unsigned NumSpaces = ((i+8)&~7) - (i+1);
    assert(NumSpaces < 8 && "Invalid computation of space amt");
    
//.........这里部分代码省略.........