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llvm-project/clang/lib/Frontend/TextDiagnostic.cpp

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//===--- 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/Basic/ConvertUTF.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/Support/Locale.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.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 templateColor =
raw_ostream::CYAN;
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 Add highlights to differences in template strings.
static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str,
bool &Normal, bool Bold) {
for (unsigned i = 0, e = Str.size(); i < e; ++i)
if (Str[i] != ToggleHighlight) {
OS << Str[i];
} else {
if (Normal)
OS.changeColor(templateColor, true);
else {
OS.resetColor();
if (Bold)
OS.changeColor(savedColor, true);
}
Normal = !Normal;
}
}
/// \brief Number of spaces to indent when word-wrapping.
const unsigned WordWrapIndentation = 6;
static int bytesSincePreviousTabOrLineBegin(StringRef SourceLine, size_t i) {
int bytes = 0;
while (0<i) {
if (SourceLine[--i]=='\t')
break;
++bytes;
}
return bytes;
}
/// \brief returns a printable representation of first item from input range
///
/// This function returns a printable representation of the next item in a line
/// of source. If the next byte begins a valid and printable character, that
/// character is returned along with 'true'.
///
/// Otherwise, if the next byte begins a valid, but unprintable character, a
/// printable, escaped representation of the character is returned, along with
/// 'false'. Otherwise a printable, escaped representation of the next byte
/// is returned along with 'false'.
///
/// \note The index is updated to be used with a subsequent call to
/// printableTextForNextCharacter.
///
/// \param SourceLine The line of source
/// \param i Pointer to byte index,
/// \param TabStop used to expand tabs
/// \return pair(printable text, 'true' iff original text was printable)
///
static std::pair<SmallString<16>, bool>
printableTextForNextCharacter(StringRef SourceLine, size_t *i,
unsigned TabStop) {
assert(i && "i must not be null");
assert(*i<SourceLine.size() && "must point to a valid index");
if (SourceLine[*i]=='\t') {
assert(0 < TabStop && TabStop <= DiagnosticOptions::MaxTabStop &&
"Invalid -ftabstop value");
unsigned col = bytesSincePreviousTabOrLineBegin(SourceLine, *i);
unsigned NumSpaces = TabStop - col%TabStop;
assert(0 < NumSpaces && NumSpaces <= TabStop
&& "Invalid computation of space amt");
++(*i);
SmallString<16> expandedTab;
expandedTab.assign(NumSpaces, ' ');
return std::make_pair(expandedTab, true);
}
// FIXME: this data is copied from the private implementation of ConvertUTF.h
static const char trailingBytesForUTF8[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
};
unsigned char const *begin, *end;
begin = reinterpret_cast<unsigned char const *>(&*(SourceLine.begin() + *i));
end = begin + SourceLine.size();
if (isLegalUTF8Sequence(begin, end)) {
UTF32 c;
UTF32 *cptr = &c;
unsigned char const *original_begin = begin;
char trailingBytes = trailingBytesForUTF8[(unsigned char)SourceLine[*i]];
unsigned char const *cp_end = begin+trailingBytes+1;
ConversionResult res = ConvertUTF8toUTF32(&begin, cp_end, &cptr, cptr+1,
strictConversion);
(void)res;
assert(conversionOK==res);
assert(0 < begin-original_begin
&& "we must be further along in the string now");
*i += begin-original_begin;
if (!llvm::sys::locale::isPrint(c)) {
// If next character is valid UTF-8, but not printable
SmallString<16> expandedCP("<U+>");
while (c) {
expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(c%16));
c/=16;
}
while (expandedCP.size() < 8)
expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(0));
return std::make_pair(expandedCP, false);
}
// If next character is valid UTF-8, and printable
return std::make_pair(SmallString<16>(original_begin, cp_end), true);
}
// If next byte is not valid UTF-8 (and therefore not printable)
SmallString<16> expandedByte("<XX>");
unsigned char byte = SourceLine[*i];
expandedByte[1] = llvm::hexdigit(byte / 16);
expandedByte[2] = llvm::hexdigit(byte % 16);
++(*i);
return std::make_pair(expandedByte, false);
}
static void expandTabs(std::string &SourceLine, unsigned TabStop) {
size_t i = SourceLine.size();
while (i>0) {
i--;
if (SourceLine[i]!='\t')
continue;
size_t tmp_i = i;
std::pair<SmallString<16>,bool> res
= printableTextForNextCharacter(SourceLine, &tmp_i, TabStop);
SourceLine.replace(i, 1, res.first.c_str());
}
}
/// This function takes a raw source line and produces a mapping from the bytes
/// of the printable representation of the line to the columns those printable
/// characters will appear at (numbering the first column as 0).
///
/// If a byte 'i' corresponds to muliple columns (e.g. the byte contains a tab
/// character) then the the array will map that byte to the first column the
/// tab appears at and the next value in the map will have been incremented
/// more than once.
///
/// If a byte is the first in a sequence of bytes that together map to a single
/// entity in the output, then the array will map that byte to the appropriate
/// column while the subsequent bytes will be -1.
///
/// The last element in the array does not correspond to any byte in the input
/// and instead is the number of columns needed to display the source
///
/// example: (given a tabstop of 8)
///
/// "a \t \u3042" -> {0,1,2,8,9,-1,-1,11}
///
/// (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
/// display)
static void byteToColumn(StringRef SourceLine, unsigned TabStop,
SmallVectorImpl<int> &out) {
out.clear();
if (SourceLine.empty()) {
out.resize(1u,0);
return;
}
out.resize(SourceLine.size()+1, -1);
int columns = 0;
size_t i = 0;
while (i<SourceLine.size()) {
out[i] = columns;
std::pair<SmallString<16>,bool> res
= printableTextForNextCharacter(SourceLine, &i, TabStop);
columns += llvm::sys::locale::columnWidth(res.first);
}
out.back() = columns;
}
/// This function takes a raw source line and produces a mapping from columns
/// to the byte of the source line that produced the character displaying at
/// that column. This is the inverse of the mapping produced by byteToColumn()
///
/// The last element in the array is the number of bytes in the source string
///
/// example: (given a tabstop of 8)
///
/// "a \t \u3042" -> {0,1,2,-1,-1,-1,-1,-1,3,4,-1,7}
///
/// (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
/// display)
static void columnToByte(StringRef SourceLine, unsigned TabStop,
SmallVectorImpl<int> &out) {
out.clear();
if (SourceLine.empty()) {
out.resize(1u, 0);
return;
}
int columns = 0;
size_t i = 0;
while (i<SourceLine.size()) {
out.resize(columns+1, -1);
out.back() = i;
std::pair<SmallString<16>,bool> res
= printableTextForNextCharacter(SourceLine, &i, TabStop);
columns += llvm::sys::locale::columnWidth(res.first);
}
out.resize(columns+1, -1);
out.back() = i;
}
struct SourceColumnMap {
SourceColumnMap(StringRef SourceLine, unsigned TabStop)
: m_SourceLine(SourceLine) {
::byteToColumn(SourceLine, TabStop, m_byteToColumn);
::columnToByte(SourceLine, TabStop, m_columnToByte);
assert(m_byteToColumn.size()==SourceLine.size()+1);
assert(0 < m_byteToColumn.size() && 0 < m_columnToByte.size());
assert(m_byteToColumn.size()
== static_cast<unsigned>(m_columnToByte.back()+1));
assert(static_cast<unsigned>(m_byteToColumn.back()+1)
== m_columnToByte.size());
}
int columns() const { return m_byteToColumn.back(); }
int bytes() const { return m_columnToByte.back(); }
int byteToColumn(int n) const {
assert(0<=n && n<static_cast<int>(m_byteToColumn.size()));
return m_byteToColumn[n];
}
int columnToByte(int n) const {
assert(0<=n && n<static_cast<int>(m_columnToByte.size()));
return m_columnToByte[n];
}
StringRef getSourceLine() const {
return m_SourceLine;
}
private:
const std::string m_SourceLine;
SmallVector<int,200> m_byteToColumn;
SmallVector<int,200> m_columnToByte;
};
// used in assert in selectInterestingSourceRegion()
namespace {
struct char_out_of_range {
const char lower,upper;
char_out_of_range(char lower, char upper) :
lower(lower), upper(upper) {}
bool operator()(char c) { return c < lower || upper < c; }
};
}
/// \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 Columns,
const SourceColumnMap &map) {
unsigned MaxColumns = std::max<unsigned>(map.columns(),
std::max(CaretLine.size(),
FixItInsertionLine.size()));
// if the number of columns is less than the desired number we're done
if (MaxColumns <= Columns)
return;
// no special characters allowed in CaretLine or FixItInsertionLine
assert(CaretLine.end() ==
std::find_if(CaretLine.begin(), CaretLine.end(),
char_out_of_range(' ','~')));
assert(FixItInsertionLine.end() ==
std::find_if(FixItInsertionLine.begin(), FixItInsertionLine.end(),
char_out_of_range(' ','~')));
// 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(static_cast<unsigned char>(CaretLine[CaretStart])))
break;
for (; CaretEnd != CaretStart; --CaretEnd)
if (!isspace(static_cast<unsigned char>(CaretLine[CaretEnd - 1])))
break;
// caret has already been inserted into CaretLine so the above whitespace
// check is guaranteed to include the caret
// 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(static_cast<unsigned char>(FixItInsertionLine[FixItStart])))
break;
for (; FixItEnd != FixItStart; --FixItEnd)
if (!isspace(static_cast<unsigned char>(FixItInsertionLine[FixItEnd - 1])))
break;
CaretStart = std::min(FixItStart, CaretStart);
CaretEnd = std::max(FixItEnd, CaretEnd);
}
// CaretEnd may have been set at the middle of a character
// If it's not at a character's first column then advance it past the current
// character.
while (static_cast<int>(CaretEnd) < map.columns() &&
-1 == map.columnToByte(CaretEnd))
++CaretEnd;
assert((static_cast<int>(CaretStart) > map.columns() ||
-1!=map.columnToByte(CaretStart)) &&
"CaretStart must not point to a column in the middle of a source"
" line character");
assert((static_cast<int>(CaretEnd) > map.columns() ||
-1!=map.columnToByte(CaretEnd)) &&
"CaretEnd must not point to a column in the middle of a source line"
" character");
// 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.
unsigned SourceStart = map.columnToByte(std::min<unsigned>(CaretStart,
map.columns()));
unsigned SourceEnd = map.columnToByte(std::min<unsigned>(CaretEnd,
map.columns()));
unsigned CaretColumnsOutsideSource = CaretEnd-CaretStart
- (map.byteToColumn(SourceEnd)-map.byteToColumn(SourceStart));
char const *front_ellipse = " ...";
char const *front_space = " ";
char const *back_ellipse = "...";
unsigned ellipses_space = strlen(front_ellipse) + strlen(back_ellipse);
unsigned TargetColumns = Columns;
// Give us extra room for the ellipses
// and any of the caret line that extends past the source
if (TargetColumns > ellipses_space+CaretColumnsOutsideSource)
TargetColumns -= ellipses_space+CaretColumnsOutsideSource;
while (SourceStart>0 || SourceEnd<SourceLine.size()) {
bool ExpandedRegion = false;
if (SourceStart>0) {
unsigned NewStart = SourceStart-1;
// Skip over any whitespace we see here; we're looking for
// another bit of interesting text.
while (NewStart &&
(map.byteToColumn(NewStart)==-1 ||
isspace(static_cast<unsigned char>(SourceLine[NewStart]))))
--NewStart;
// Skip over this bit of "interesting" text.
while (NewStart &&
(map.byteToColumn(NewStart)!=-1 &&
!isspace(static_cast<unsigned char>(SourceLine[NewStart]))))
--NewStart;
// Move up to the non-whitespace character we just saw.
if (NewStart)
++NewStart;
unsigned NewColumns = map.byteToColumn(SourceEnd) -
map.byteToColumn(NewStart);
if (NewColumns <= TargetColumns) {
SourceStart = NewStart;
ExpandedRegion = true;
}
}
if (SourceEnd<SourceLine.size()) {
unsigned NewEnd = SourceEnd+1;
// Skip over any whitespace we see here; we're looking for
// another bit of interesting text.
while (NewEnd<SourceLine.size() &&
(map.byteToColumn(NewEnd)==-1 ||
isspace(static_cast<unsigned char>(SourceLine[NewEnd]))))
++NewEnd;
// Skip over this bit of "interesting" text.
while (NewEnd<SourceLine.size() &&
(map.byteToColumn(NewEnd)!=-1 &&
!isspace(static_cast<unsigned char>(SourceLine[NewEnd]))))
++NewEnd;
unsigned NewColumns = map.byteToColumn(NewEnd) -
map.byteToColumn(SourceStart);
if (NewColumns <= TargetColumns) {
SourceEnd = NewEnd;
ExpandedRegion = true;
}
}
if (!ExpandedRegion)
break;
}
CaretStart = map.byteToColumn(SourceStart);
CaretEnd = map.byteToColumn(SourceEnd) + CaretColumnsOutsideSource;
// [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.
assert(CaretStart!=(unsigned)-1 && CaretEnd!=(unsigned)-1 &&
SourceStart!=(unsigned)-1 && SourceEnd!=(unsigned)-1);
assert(SourceStart <= SourceEnd);
assert(CaretStart <= CaretEnd);
unsigned BackColumnsRemoved
= map.byteToColumn(SourceLine.size())-map.byteToColumn(SourceEnd);
unsigned FrontColumnsRemoved = CaretStart;
unsigned ColumnsKept = CaretEnd-CaretStart;
// We checked up front that the line needed truncation
assert(FrontColumnsRemoved+ColumnsKept+BackColumnsRemoved > Columns);
// The line needs some trunctiona, and we'd prefer to keep the front
// if possible, so remove the back
if (BackColumnsRemoved)
SourceLine.replace(SourceEnd, std::string::npos, back_ellipse);
// If that's enough then we're done
if (FrontColumnsRemoved+ColumnsKept <= Columns)
return;
// Otherwise remove the front as well
if (FrontColumnsRemoved) {
SourceLine.replace(0, SourceStart, front_ellipse);
CaretLine.replace(0, CaretStart, front_space);
if (!FixItInsertionLine.empty())
FixItInsertionLine.replace(0, CaretStart, front_space);
}
}
/// \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 Bold if the current text should be bold
/// \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,
bool Bold = false,
unsigned Indentation = WordWrapIndentation) {
const unsigned Length = std::min(Str.find('\n'), Str.size());
bool TextNormal = true;
// 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;
}
applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
TextNormal, Bold);
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);
applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
TextNormal, Bold);
Column = Indentation + WordLength;
Wrapped = true;
}
// Append any remaning text from the message with its existing formatting.
applyTemplateHighlighting(OS, Str.substr(Length), TextNormal, Bold);
assert(TextNormal && "Text highlighted at end of diagnostic message.");
return Wrapped;
}
TextDiagnostic::TextDiagnostic(raw_ostream &OS,
const LangOptions &LangOpts,
const DiagnosticOptions &DiagOpts)
: DiagnosticRenderer(LangOpts, DiagOpts), OS(OS) {}
TextDiagnostic::~TextDiagnostic() {}
void
TextDiagnostic::emitDiagnosticMessage(SourceLocation Loc,
PresumedLoc PLoc,
DiagnosticsEngine::Level Level,
StringRef Message,
ArrayRef<clang::CharSourceRange> Ranges,
const SourceManager *SM,
DiagOrStoredDiag D) {
uint64_t StartOfLocationInfo = OS.tell();
// Emit the location of this particular diagnostic.
if (Loc.isValid())
emitDiagnosticLoc(Loc, PLoc, Level, Ranges, *SM);
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) {
bool Bold = false;
if (ShowColors) {
// Print warnings, errors and fatal errors in bold, no color
switch (Level) {
case DiagnosticsEngine::Warning:
case DiagnosticsEngine::Error:
case DiagnosticsEngine::Fatal:
OS.changeColor(savedColor, true);
Bold = true;
break;
default: break; //don't bold notes
}
}
if (Columns)
printWordWrapped(OS, Message, Columns, CurrentColumn, Bold);
else {
bool Normal = true;
applyTemplateHighlighting(OS, Message, Normal, Bold);
assert(Normal && "Formatting should have returned to normal");
}
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,
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.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,
const SourceManager &SM) {
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,
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);
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, ' ');
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);
// Next, insert the caret itself.
ColNo = sourceColMap.byteToColumn(ColNo-1);
if (CaretLine.size()<ColNo+1)
CaretLine.resize(ColNo+1, ' ');
CaretLine[ColNo] = '^';
std::string FixItInsertionLine = buildFixItInsertionLine(LineNo,
sourceColMap,
Hints, SM);
// 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);
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, SM);
}
void TextDiagnostic::emitSnippet(StringRef line) {
if (line.empty())
return;
size_t i = 0;
std::string to_print;
bool print_reversed = false;
while (i<line.size()) {
std::pair<SmallString<16>,bool> res
= printableTextForNextCharacter(line, &i, DiagOpts.TabStop);
bool was_printable = res.second;
if (DiagOpts.ShowColors && was_printable == print_reversed) {
if (print_reversed)
OS.reverseColor();
OS << to_print;
to_print.clear();
if (DiagOpts.ShowColors)
OS.resetColor();
}
print_reversed = !was_printable;
to_print += res.first.str();
}
if (print_reversed && DiagOpts.ShowColors)
OS.reverseColor();
OS << to_print;
if (print_reversed && DiagOpts.ShowColors)
OS.resetColor();
OS << '\n';
}
/// \brief Highlight a SourceRange (with ~'s) for any characters on LineNo.
void TextDiagnostic::highlightRange(const CharSourceRange &R,
unsigned LineNo, FileID FID,
const SourceColumnMap &map,
std::string &CaretLine,
const SourceManager &SM) {
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 = map.getSourceLine().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 < map.getSourceLine().size() &&
(map.getSourceLine()[StartColNo] == ' ' ||
map.getSourceLine()[StartColNo] == '\t'))
++StartColNo;
// Pick the last non-whitespace column.
if (EndColNo > map.getSourceLine().size())
EndColNo = map.getSourceLine().size();
while (EndColNo-1 &&
(map.getSourceLine()[EndColNo-1] == ' ' ||
map.getSourceLine()[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??");
}
assert(StartColNo <= map.getSourceLine().size() && "Invalid range!");
assert(EndColNo <= map.getSourceLine().size() && "Invalid range!");
// Fill the range with ~'s.
StartColNo = map.byteToColumn(StartColNo);
EndColNo = map.byteToColumn(EndColNo);
assert(StartColNo <= EndColNo && "Invalid range!");
if (CaretLine.size() < EndColNo)
CaretLine.resize(EndColNo,' ');
std::fill(CaretLine.begin()+StartColNo,CaretLine.begin()+EndColNo,'~');
}
std::string TextDiagnostic::buildFixItInsertionLine(
unsigned LineNo,
const SourceColumnMap &map,
ArrayRef<FixItHint> Hints,
const SourceManager &SM) {
std::string FixItInsertionLine;
if (Hints.empty() || !DiagOpts.ShowFixits)
return FixItInsertionLine;
unsigned PrevHintEnd = 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 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) - 1;
// hint must start inside the source or right at the end
assert(HintColNo<static_cast<unsigned>(map.bytes())+1);
HintColNo = map.byteToColumn(HintColNo);
// 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 (HintColNo < PrevHintEnd)
HintColNo = PrevHintEnd + 1;
// FIXME: if the fixit includes tabs or other characters that do not
// take up a single column per byte when displayed then
// I->CodeToInsert.size() is not a column number and we're mixing
// units (columns + bytes). We should get printable versions
// of each fixit before using them.
unsigned LastColumnModified
= HintColNo + I->CodeToInsert.size();
if (LastColumnModified <= static_cast<unsigned>(map.bytes())) {
// If we're right in the middle of a multibyte character skip to
// the end of it.
while (map.byteToColumn(LastColumnModified) == -1)
++LastColumnModified;
LastColumnModified = map.byteToColumn(LastColumnModified);
}
if (LastColumnModified > FixItInsertionLine.size())
FixItInsertionLine.resize(LastColumnModified, ' ');
assert(HintColNo+I->CodeToInsert.size() <= FixItInsertionLine.size());
std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
FixItInsertionLine.begin() + HintColNo);
PrevHintEnd = LastColumnModified;
} else {
FixItInsertionLine.clear();
break;
}
}
}
expandTabs(FixItInsertionLine, DiagOpts.TabStop);
return FixItInsertionLine;
}
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";
}
}
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