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Diffstat (limited to 'contrib/llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp | 881 |
1 files changed, 881 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp b/contrib/llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp new file mode 100644 index 0000000..9f5dcb4 --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp @@ -0,0 +1,881 @@ +//===--- TextDiagnostic.cpp - Text Diagnostic Pretty-Printing -------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "clang/Frontend/TextDiagnostic.h" +#include "clang/Basic/FileManager.h" +#include "clang/Basic/SourceManager.h" +#include "clang/Frontend/DiagnosticOptions.h" +#include "clang/Lex/Lexer.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/ADT/SmallString.h" +#include <algorithm> +using namespace clang; + +static const enum raw_ostream::Colors noteColor = + raw_ostream::BLACK; +static const enum raw_ostream::Colors fixitColor = + raw_ostream::GREEN; +static const enum raw_ostream::Colors caretColor = + raw_ostream::GREEN; +static const enum raw_ostream::Colors warningColor = + raw_ostream::MAGENTA; +static const enum raw_ostream::Colors errorColor = raw_ostream::RED; +static const enum raw_ostream::Colors fatalColor = raw_ostream::RED; +// Used for changing only the bold attribute. +static const enum raw_ostream::Colors savedColor = + raw_ostream::SAVEDCOLOR; + +/// \brief Number of spaces to indent when word-wrapping. +const unsigned WordWrapIndentation = 6; + +/// \brief When the source code line we want to print is too long for +/// the terminal, select the "interesting" region. +static void selectInterestingSourceRegion(std::string &SourceLine, + std::string &CaretLine, + std::string &FixItInsertionLine, + unsigned EndOfCaretToken, + unsigned Columns) { + unsigned MaxSize = std::max(SourceLine.size(), + std::max(CaretLine.size(), + FixItInsertionLine.size())); + if (MaxSize > SourceLine.size()) + SourceLine.resize(MaxSize, ' '); + if (MaxSize > CaretLine.size()) + CaretLine.resize(MaxSize, ' '); + if (!FixItInsertionLine.empty() && MaxSize > FixItInsertionLine.size()) + FixItInsertionLine.resize(MaxSize, ' '); + + // Find the slice that we need to display the full caret line + // correctly. + unsigned CaretStart = 0, CaretEnd = CaretLine.size(); + for (; CaretStart != CaretEnd; ++CaretStart) + if (!isspace(CaretLine[CaretStart])) + break; + + for (; CaretEnd != CaretStart; --CaretEnd) + if (!isspace(CaretLine[CaretEnd - 1])) + break; + + // Make sure we don't chop the string shorter than the caret token + // itself. + if (CaretEnd < EndOfCaretToken) + CaretEnd = EndOfCaretToken; + + // If we have a fix-it line, make sure the slice includes all of the + // fix-it information. + if (!FixItInsertionLine.empty()) { + unsigned FixItStart = 0, FixItEnd = FixItInsertionLine.size(); + for (; FixItStart != FixItEnd; ++FixItStart) + if (!isspace(FixItInsertionLine[FixItStart])) + break; + + for (; FixItEnd != FixItStart; --FixItEnd) + if (!isspace(FixItInsertionLine[FixItEnd - 1])) + break; + + if (FixItStart < CaretStart) + CaretStart = FixItStart; + if (FixItEnd > CaretEnd) + CaretEnd = FixItEnd; + } + + // CaretLine[CaretStart, CaretEnd) contains all of the interesting + // parts of the caret line. While this slice is smaller than the + // number of columns we have, try to grow the slice to encompass + // more context. + + // If the end of the interesting region comes before we run out of + // space in the terminal, start at the beginning of the line. + if (Columns > 3 && CaretEnd < Columns - 3) + CaretStart = 0; + + unsigned TargetColumns = Columns; + if (TargetColumns > 8) + TargetColumns -= 8; // Give us extra room for the ellipses. + unsigned SourceLength = SourceLine.size(); + while ((CaretEnd - CaretStart) < TargetColumns) { + bool ExpandedRegion = false; + // Move the start of the interesting region left until we've + // pulled in something else interesting. + if (CaretStart == 1) + CaretStart = 0; + else if (CaretStart > 1) { + unsigned NewStart = CaretStart - 1; + + // Skip over any whitespace we see here; we're looking for + // another bit of interesting text. + while (NewStart && isspace(SourceLine[NewStart])) + --NewStart; + + // Skip over this bit of "interesting" text. + while (NewStart && !isspace(SourceLine[NewStart])) + --NewStart; + + // Move up to the non-whitespace character we just saw. + if (NewStart) + ++NewStart; + + // If we're still within our limit, update the starting + // position within the source/caret line. + if (CaretEnd - NewStart <= TargetColumns) { + CaretStart = NewStart; + ExpandedRegion = true; + } + } + + // Move the end of the interesting region right until we've + // pulled in something else interesting. + if (CaretEnd != SourceLength) { + assert(CaretEnd < SourceLength && "Unexpected caret position!"); + unsigned NewEnd = CaretEnd; + + // Skip over any whitespace we see here; we're looking for + // another bit of interesting text. + while (NewEnd != SourceLength && isspace(SourceLine[NewEnd - 1])) + ++NewEnd; + + // Skip over this bit of "interesting" text. + while (NewEnd != SourceLength && !isspace(SourceLine[NewEnd - 1])) + ++NewEnd; + + if (NewEnd - CaretStart <= TargetColumns) { + CaretEnd = NewEnd; + ExpandedRegion = true; + } + } + + if (!ExpandedRegion) + break; + } + + // [CaretStart, CaretEnd) is the slice we want. Update the various + // output lines to show only this slice, with two-space padding + // before the lines so that it looks nicer. + if (CaretEnd < SourceLine.size()) + SourceLine.replace(CaretEnd, std::string::npos, "..."); + if (CaretEnd < CaretLine.size()) + CaretLine.erase(CaretEnd, std::string::npos); + if (FixItInsertionLine.size() > CaretEnd) + FixItInsertionLine.erase(CaretEnd, std::string::npos); + + if (CaretStart > 2) { + SourceLine.replace(0, CaretStart, " ..."); + CaretLine.replace(0, CaretStart, " "); + if (FixItInsertionLine.size() >= CaretStart) + FixItInsertionLine.replace(0, CaretStart, " "); + } +} + +/// \brief Skip over whitespace in the string, starting at the given +/// index. +/// +/// \returns The index of the first non-whitespace character that is +/// greater than or equal to Idx or, if no such character exists, +/// returns the end of the string. +static unsigned skipWhitespace(unsigned Idx, StringRef Str, unsigned Length) { + while (Idx < Length && isspace(Str[Idx])) + ++Idx; + return Idx; +} + +/// \brief If the given character is the start of some kind of +/// balanced punctuation (e.g., quotes or parentheses), return the +/// character that will terminate the punctuation. +/// +/// \returns The ending punctuation character, if any, or the NULL +/// character if the input character does not start any punctuation. +static inline char findMatchingPunctuation(char c) { + switch (c) { + case '\'': return '\''; + case '`': return '\''; + case '"': return '"'; + case '(': return ')'; + case '[': return ']'; + case '{': return '}'; + default: break; + } + + return 0; +} + +/// \brief Find the end of the word starting at the given offset +/// within a string. +/// +/// \returns the index pointing one character past the end of the +/// word. +static unsigned findEndOfWord(unsigned Start, StringRef Str, + unsigned Length, unsigned Column, + unsigned Columns) { + assert(Start < Str.size() && "Invalid start position!"); + unsigned End = Start + 1; + + // If we are already at the end of the string, take that as the word. + if (End == Str.size()) + return End; + + // Determine if the start of the string is actually opening + // punctuation, e.g., a quote or parentheses. + char EndPunct = findMatchingPunctuation(Str[Start]); + if (!EndPunct) { + // This is a normal word. Just find the first space character. + while (End < Length && !isspace(Str[End])) + ++End; + return End; + } + + // We have the start of a balanced punctuation sequence (quotes, + // parentheses, etc.). Determine the full sequence is. + SmallString<16> PunctuationEndStack; + PunctuationEndStack.push_back(EndPunct); + while (End < Length && !PunctuationEndStack.empty()) { + if (Str[End] == PunctuationEndStack.back()) + PunctuationEndStack.pop_back(); + else if (char SubEndPunct = findMatchingPunctuation(Str[End])) + PunctuationEndStack.push_back(SubEndPunct); + + ++End; + } + + // Find the first space character after the punctuation ended. + while (End < Length && !isspace(Str[End])) + ++End; + + unsigned PunctWordLength = End - Start; + if (// If the word fits on this line + Column + PunctWordLength <= Columns || + // ... or the word is "short enough" to take up the next line + // without too much ugly white space + PunctWordLength < Columns/3) + return End; // Take the whole thing as a single "word". + + // The whole quoted/parenthesized string is too long to print as a + // single "word". Instead, find the "word" that starts just after + // the punctuation and use that end-point instead. This will recurse + // until it finds something small enough to consider a word. + return findEndOfWord(Start + 1, Str, Length, Column + 1, Columns); +} + +/// \brief Print the given string to a stream, word-wrapping it to +/// some number of columns in the process. +/// +/// \param OS the stream to which the word-wrapping string will be +/// emitted. +/// \param Str the string to word-wrap and output. +/// \param Columns the number of columns to word-wrap to. +/// \param Column the column number at which the first character of \p +/// Str will be printed. This will be non-zero when part of the first +/// line has already been printed. +/// \param Indentation the number of spaces to indent any lines beyond +/// the first line. +/// \returns true if word-wrapping was required, or false if the +/// string fit on the first line. +static bool printWordWrapped(raw_ostream &OS, StringRef Str, + unsigned Columns, + unsigned Column = 0, + unsigned Indentation = WordWrapIndentation) { + const unsigned Length = std::min(Str.find('\n'), Str.size()); + + // The string used to indent each line. + SmallString<16> IndentStr; + IndentStr.assign(Indentation, ' '); + bool Wrapped = false; + for (unsigned WordStart = 0, WordEnd; WordStart < Length; + WordStart = WordEnd) { + // Find the beginning of the next word. + WordStart = skipWhitespace(WordStart, Str, Length); + if (WordStart == Length) + break; + + // Find the end of this word. + WordEnd = findEndOfWord(WordStart, Str, Length, Column, Columns); + + // Does this word fit on the current line? + unsigned WordLength = WordEnd - WordStart; + if (Column + WordLength < Columns) { + // This word fits on the current line; print it there. + if (WordStart) { + OS << ' '; + Column += 1; + } + OS << Str.substr(WordStart, WordLength); + Column += WordLength; + continue; + } + + // This word does not fit on the current line, so wrap to the next + // line. + OS << '\n'; + OS.write(&IndentStr[0], Indentation); + OS << Str.substr(WordStart, WordLength); + Column = Indentation + WordLength; + Wrapped = true; + } + + // Append any remaning text from the message with its existing formatting. + OS << Str.substr(Length); + + return Wrapped; +} + +TextDiagnostic::TextDiagnostic(raw_ostream &OS, + const SourceManager &SM, + const LangOptions &LangOpts, + const DiagnosticOptions &DiagOpts) + : DiagnosticRenderer(SM, LangOpts, DiagOpts), OS(OS) {} + +TextDiagnostic::~TextDiagnostic() {} + +void +TextDiagnostic::emitDiagnosticMessage(SourceLocation Loc, + PresumedLoc PLoc, + DiagnosticsEngine::Level Level, + StringRef Message, + ArrayRef<clang::CharSourceRange> Ranges, + DiagOrStoredDiag D) { + uint64_t StartOfLocationInfo = OS.tell(); + + // Emit the location of this particular diagnostic. + emitDiagnosticLoc(Loc, PLoc, Level, Ranges); + + if (DiagOpts.ShowColors) + OS.resetColor(); + + printDiagnosticLevel(OS, Level, DiagOpts.ShowColors); + printDiagnosticMessage(OS, Level, Message, + OS.tell() - StartOfLocationInfo, + DiagOpts.MessageLength, DiagOpts.ShowColors); +} + +/*static*/ void +TextDiagnostic::printDiagnosticLevel(raw_ostream &OS, + DiagnosticsEngine::Level Level, + bool ShowColors) { + if (ShowColors) { + // Print diagnostic category in bold and color + switch (Level) { + case DiagnosticsEngine::Ignored: + llvm_unreachable("Invalid diagnostic type"); + case DiagnosticsEngine::Note: OS.changeColor(noteColor, true); break; + case DiagnosticsEngine::Warning: OS.changeColor(warningColor, true); break; + case DiagnosticsEngine::Error: OS.changeColor(errorColor, true); break; + case DiagnosticsEngine::Fatal: OS.changeColor(fatalColor, true); break; + } + } + + switch (Level) { + case DiagnosticsEngine::Ignored: + llvm_unreachable("Invalid diagnostic type"); + case DiagnosticsEngine::Note: OS << "note: "; break; + case DiagnosticsEngine::Warning: OS << "warning: "; break; + case DiagnosticsEngine::Error: OS << "error: "; break; + case DiagnosticsEngine::Fatal: OS << "fatal error: "; break; + } + + if (ShowColors) + OS.resetColor(); +} + +/*static*/ void +TextDiagnostic::printDiagnosticMessage(raw_ostream &OS, + DiagnosticsEngine::Level Level, + StringRef Message, + unsigned CurrentColumn, unsigned Columns, + bool ShowColors) { + if (ShowColors) { + // Print warnings, errors and fatal errors in bold, no color + switch (Level) { + case DiagnosticsEngine::Warning: OS.changeColor(savedColor, true); break; + case DiagnosticsEngine::Error: OS.changeColor(savedColor, true); break; + case DiagnosticsEngine::Fatal: OS.changeColor(savedColor, true); break; + default: break; //don't bold notes + } + } + + if (Columns) + printWordWrapped(OS, Message, Columns, CurrentColumn); + else + OS << Message; + + if (ShowColors) + OS.resetColor(); + OS << '\n'; +} + +/// \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) { + 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.Format) { + case DiagnosticOptions::Clang: 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.Format == DiagnosticOptions::Msvc) { + OS << ','; + ColNo--; + } else + OS << ':'; + OS << ColNo; + } + switch (DiagOpts.Format) { + case DiagnosticOptions::Clang: + 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; + } + + if (PrintedRange) + OS << ':'; + } + OS << ' '; +} + +void TextDiagnostic::emitBasicNote(StringRef Message) { + // FIXME: Emit this as a real note diagnostic. + // FIXME: Format an actual diagnostic rather than a hard coded string. + OS << "note: " << Message << "\n"; +} + +void TextDiagnostic::emitIncludeLocation(SourceLocation Loc, + PresumedLoc PLoc) { + if (DiagOpts.ShowLocation) + OS << "In file included from " << PLoc.getFilename() << ':' + << PLoc.getLine() << ":\n"; + else + OS << "In included file:\n"; +} + +/// \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) { + 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); + 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. + for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(), + E = Ranges.end(); + I != E; ++I) + highlightRange(*I, LineNo, FID, SourceLine, CaretLine); + + // Next, insert the caret itself. + if (ColNo-1 < CaretLine.size()) + CaretLine[ColNo-1] = '^'; + else + CaretLine.push_back('^'); + + expandTabs(SourceLine, CaretLine); + + // 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; + } + + std::string FixItInsertionLine = buildFixItInsertionLine(LineNo, + LineStart, LineEnd, + Hints); + + // 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 && SourceLine.size() > Columns) + selectInterestingSourceRegion(SourceLine, CaretLine, FixItInsertionLine, + CaretEndColNo, Columns); + + // 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. + OS << SourceLine << '\n'; + + if (DiagOpts.ShowColors) + OS.changeColor(caretColor, true); + OS << CaretLine << '\n'; + if (DiagOpts.ShowColors) + OS.resetColor(); + + if (!FixItInsertionLine.empty()) { + if (DiagOpts.ShowColors) + // Print fixit line in color + OS.changeColor(fixitColor, false); + if (DiagOpts.ShowSourceRanges) + OS << ' '; + OS << FixItInsertionLine << '\n'; + if (DiagOpts.ShowColors) + OS.resetColor(); + } + + // Print out any parseable fixit information requested by the options. + emitParseableFixits(Hints); +} + +/// \brief Highlight a SourceRange (with ~'s) for any characters on LineNo. +void TextDiagnostic::highlightRange(const CharSourceRange &R, + unsigned LineNo, FileID FID, + const std::string &SourceLine, + std::string &CaretLine) { + assert(CaretLine.size() == SourceLine.size() && + "Expect a correspondence between source and caret line!"); + if (!R.isValid()) return; + + SourceLocation Begin = SM.getExpansionLoc(R.getBegin()); + SourceLocation End = SM.getExpansionLoc(R.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 (Begin == End && R.getEnd().isMacroID()) + End = SM.getExpansionRange(R.getEnd()).second; + + unsigned StartLineNo = SM.getExpansionLineNumber(Begin); + if (StartLineNo > LineNo || SM.getFileID(Begin) != FID) + return; // No intersection. + + unsigned EndLineNo = SM.getExpansionLineNumber(End); + if (EndLineNo < LineNo || SM.getFileID(End) != FID) + return; // No intersection. + + // Compute the column number of the start. + unsigned StartColNo = 0; + if (StartLineNo == LineNo) { + StartColNo = SM.getExpansionColumnNumber(Begin); + if (StartColNo) --StartColNo; // Zero base the col #. + } + + // Compute the column number of the end. + unsigned EndColNo = CaretLine.size(); + if (EndLineNo == LineNo) { + EndColNo = SM.getExpansionColumnNumber(End); + if (EndColNo) { + --EndColNo; // Zero base the col #. + + // Add in the length of the token, so that we cover multi-char tokens if + // this is a token range. + if (R.isTokenRange()) + EndColNo += Lexer::MeasureTokenLength(End, SM, LangOpts); + } else { + EndColNo = CaretLine.size(); + } + } + + assert(StartColNo <= EndColNo && "Invalid range!"); + + // Check that a token range does not highlight only whitespace. + if (R.isTokenRange()) { + // Pick the first non-whitespace column. + while (StartColNo < SourceLine.size() && + (SourceLine[StartColNo] == ' ' || SourceLine[StartColNo] == '\t')) + ++StartColNo; + + // Pick the last non-whitespace column. + if (EndColNo > SourceLine.size()) + EndColNo = SourceLine.size(); + while (EndColNo-1 && + (SourceLine[EndColNo-1] == ' ' || SourceLine[EndColNo-1] == '\t')) + --EndColNo; + + // If the start/end passed each other, then we are trying to highlight a + // range that just exists in whitespace, which must be some sort of other + // bug. + assert(StartColNo <= EndColNo && "Trying to highlight whitespace??"); + } + + // Fill the range with ~'s. + for (unsigned i = StartColNo; i < EndColNo; ++i) + CaretLine[i] = '~'; +} + +std::string TextDiagnostic::buildFixItInsertionLine(unsigned LineNo, + const char *LineStart, + const char *LineEnd, + ArrayRef<FixItHint> Hints) { + std::string FixItInsertionLine; + if (Hints.empty() || !DiagOpts.ShowFixits) + return FixItInsertionLine; + + 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 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)) { + // Insert the new code into the line just below the code + // that the user wrote. + unsigned HintColNo + = SM.getColumnNumber(HintLocInfo.first, HintLocInfo.second); + unsigned LastColumnModified + = HintColNo - 1 + I->CodeToInsert.size(); + if (LastColumnModified > FixItInsertionLine.size()) + FixItInsertionLine.resize(LastColumnModified, ' '); + std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(), + FixItInsertionLine.begin() + HintColNo - 1); + } else { + FixItInsertionLine.clear(); + break; + } + } + } + + if (FixItInsertionLine.empty()) + return FixItInsertionLine; + + // Now that we have the entire fixit line, expand the tabs in it. + // Since we don't want to insert spaces in the middle of a word, + // find each word and the column it should line up with and insert + // spaces until they match. + unsigned FixItPos = 0; + unsigned LinePos = 0; + unsigned TabExpandedCol = 0; + unsigned LineLength = LineEnd - LineStart; + + while (FixItPos < FixItInsertionLine.size() && LinePos < LineLength) { + // Find the next word in the FixIt line. + while (FixItPos < FixItInsertionLine.size() && + FixItInsertionLine[FixItPos] == ' ') + ++FixItPos; + unsigned CharDistance = FixItPos - TabExpandedCol; + + // Walk forward in the source line, keeping track of + // the tab-expanded column. + for (unsigned I = 0; I < CharDistance; ++I, ++LinePos) + if (LinePos >= LineLength || LineStart[LinePos] != '\t') + ++TabExpandedCol; + else + TabExpandedCol = + (TabExpandedCol/DiagOpts.TabStop + 1) * DiagOpts.TabStop; + + // Adjust the fixit line to match this column. + FixItInsertionLine.insert(FixItPos, TabExpandedCol-FixItPos, ' '); + FixItPos = TabExpandedCol; + + // Walk to the end of the word. + while (FixItPos < FixItInsertionLine.size() && + FixItInsertionLine[FixItPos] != ' ') + ++FixItPos; + } + + return FixItInsertionLine; +} + +void TextDiagnostic::expandTabs(std::string &SourceLine, + std::string &CaretLine) { + // Scan the source line, looking for tabs. If we find any, manually expand + // them to spaces 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 TabStop = DiagOpts.TabStop; + assert(0 < TabStop && TabStop <= DiagnosticOptions::MaxTabStop && + "Invalid -ftabstop value"); + unsigned NumSpaces = ((i+TabStop)/TabStop * TabStop) - (i+1); + assert(NumSpaces < TabStop && "Invalid computation of space amt"); + + // Insert spaces into the SourceLine. + SourceLine.insert(i+1, NumSpaces, ' '); + + // Insert spaces or ~'s into CaretLine. + CaretLine.insert(i+1, NumSpaces, CaretLine[i] == '~' ? '~' : ' '); + } +} + +void TextDiagnostic::emitParseableFixits(ArrayRef<FixItHint> Hints) { + 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"; + } +} + |
