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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/CharInfo.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Locale.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace clang;
static const enum raw_ostream::Colors noteColor =
raw_ostream::BLACK;
static const enum raw_ostream::Colors remarkColor =
raw_ostream::BLUE;
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;
/// Add highlights to differences in template strings.
static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str,
bool &Normal, bool Bold) {
while (1) {
size_t Pos = Str.find(ToggleHighlight);
OS << Str.slice(0, Pos);
if (Pos == StringRef::npos)
break;
Str = Str.substr(Pos + 1);
if (Normal)
OS.changeColor(templateColor, true);
else {
OS.resetColor();
if (Bold)
OS.changeColor(savedColor, true);
}
Normal = !Normal;
}
}
/// 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;
}
/// 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);
}
unsigned char const *begin, *end;
begin = reinterpret_cast<unsigned char const *>(&*(SourceLine.begin() + *i));
end = begin + (SourceLine.size() - *i);
if (llvm::isLegalUTF8Sequence(begin, end)) {
llvm::UTF32 c;
llvm::UTF32 *cptr = &c;
unsigned char const *original_begin = begin;
unsigned char const *cp_end =
begin + llvm::getNumBytesForUTF8(SourceLine[*i]);
llvm::ConversionResult res = llvm::ConvertUTF8toUTF32(
&begin, cp_end, &cptr, cptr + 1, llvm::strictConversion);
(void)res;
assert(llvm::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 multiple columns (e.g. the byte contains a tab
/// character) then 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;
}
namespace {
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(); }
/// Map a byte to the column which it is at the start of, or return -1
/// if it is not at the start of a column (for a UTF-8 trailing byte).
int byteToColumn(int n) const {
assert(0<=n && n<static_cast<int>(m_byteToColumn.size()));
return m_byteToColumn[n];
}
/// Map a byte to the first column which contains it.
int byteToContainingColumn(int N) const {
assert(0 <= N && N < static_cast<int>(m_byteToColumn.size()));
while (m_byteToColumn[N] == -1)
--N;
return m_byteToColumn[N];
}
/// Map a column to the byte which starts the column, or return -1 if
/// the column the second or subsequent column of an expanded tab or similar
/// multi-column entity.
int columnToByte(int n) const {
assert(0<=n && n<static_cast<int>(m_columnToByte.size()));
return m_columnToByte[n];
}
/// Map from a byte index to the next byte which starts a column.
int startOfNextColumn(int N) const {
assert(0 <= N && N < static_cast<int>(m_byteToColumn.size() - 1));
while (byteToColumn(++N) == -1) {}
return N;
}
/// Map from a byte index to the previous byte which starts a column.
int startOfPreviousColumn(int N) const {
assert(0 < N && N < static_cast<int>(m_byteToColumn.size()));
while (byteToColumn(--N) == -1) {}
return N;
}
StringRef getSourceLine() const {
return m_SourceLine;
}
private:
const std::string m_SourceLine;
SmallVector<int,200> m_byteToColumn;
SmallVector<int,200> m_columnToByte;
};
} // end anonymous namespace
/// 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 CaretColumns = CaretLine.size();
unsigned FixItColumns = llvm::sys::locale::columnWidth(FixItInsertionLine);
unsigned MaxColumns = std::max(static_cast<unsigned>(map.columns()),
std::max(CaretColumns, FixItColumns));
// if the number of columns is less than the desired number we're done
if (MaxColumns <= Columns)
return;
// No special characters are allowed in CaretLine.
assert(CaretLine.end() ==
std::find_if(CaretLine.begin(), CaretLine.end(),
[](char c) { return c < ' ' || '~' < c; }));
// Find the slice that we need to display the full caret line
// correctly.
unsigned CaretStart = 0, CaretEnd = CaretLine.size();
for (; CaretStart != CaretEnd; ++CaretStart)
if (!isWhitespace(CaretLine[CaretStart]))
break;
for (; CaretEnd != CaretStart; --CaretEnd)
if (!isWhitespace(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 (!isWhitespace(FixItInsertionLine[FixItStart]))
break;
for (; FixItEnd != FixItStart; --FixItEnd)
if (!isWhitespace(FixItInsertionLine[FixItEnd - 1]))
break;
// We can safely use the byte offset FixItStart as the column offset
// because the characters up until FixItStart are all ASCII whitespace
// characters.
unsigned FixItStartCol = FixItStart;
unsigned FixItEndCol
= llvm::sys::locale::columnWidth(FixItInsertionLine.substr(0, FixItEnd));
CaretStart = std::min(FixItStartCol, CaretStart);
CaretEnd = std::max(FixItEndCol, 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 = map.startOfPreviousColumn(SourceStart);
// Skip over any whitespace we see here; we're looking for
// another bit of interesting text.
// FIXME: Detect non-ASCII whitespace characters too.
while (NewStart && isWhitespace(SourceLine[NewStart]))
NewStart = map.startOfPreviousColumn(NewStart);
// Skip over this bit of "interesting" text.
while (NewStart) {
unsigned Prev = map.startOfPreviousColumn(NewStart);
if (isWhitespace(SourceLine[Prev]))
break;
NewStart = Prev;
}
assert(map.byteToColumn(NewStart) != -1);
unsigned NewColumns = map.byteToColumn(SourceEnd) -
map.byteToColumn(NewStart);
if (NewColumns <= TargetColumns) {
SourceStart = NewStart;
ExpandedRegion = true;
}
}
if (SourceEnd<SourceLine.size()) {
unsigned NewEnd = map.startOfNextColumn(SourceEnd);
// Skip over any whitespace we see here; we're looking for
// another bit of interesting text.
// FIXME: Detect non-ASCII whitespace characters too.
while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
NewEnd = map.startOfNextColumn(NewEnd);
// Skip over this bit of "interesting" text.
while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
NewEnd = map.startOfNextColumn(NewEnd);
assert(map.byteToColumn(NewEnd) != -1);
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 truncation, and we'd prefer to keep the front
// if possible, so remove the back
if (BackColumnsRemoved > strlen(back_ellipse))
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 > strlen(front_ellipse)) {
SourceLine.replace(0, SourceStart, front_ellipse);
CaretLine.replace(0, CaretStart, front_space);
if (!FixItInsertionLine.empty())
FixItInsertionLine.replace(0, CaretStart, front_space);
}
}
/// 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 && isWhitespace(Str[Idx]))
++Idx;
return Idx;
}
/// 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;
}
/// 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 && !isWhitespace(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 && !isWhitespace(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);
}
/// 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,
DiagnosticOptions *DiagOpts)
: DiagnosticRenderer(LangOpts, DiagOpts), OS(OS) {}
TextDiagnostic::~TextDiagnostic() {}
void TextDiagnostic::emitDiagnosticMessage(
FullSourceLoc 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.
if (Loc.isValid())
emitDiagnosticLoc(Loc, PLoc, Level, Ranges);
if (DiagOpts->ShowColors)
OS.resetColor();
printDiagnosticLevel(OS, Level, DiagOpts->ShowColors,
DiagOpts->CLFallbackMode);
printDiagnosticMessage(OS,
/*IsSupplemental*/ Level == DiagnosticsEngine::Note,
Message, OS.tell() - StartOfLocationInfo,
DiagOpts->MessageLength, DiagOpts->ShowColors);
}
/*static*/ void
TextDiagnostic::printDiagnosticLevel(raw_ostream &OS,
DiagnosticsEngine::Level Level,
bool ShowColors,
bool CLFallbackMode) {
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::Remark: OS.changeColor(remarkColor, 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::Remark: OS << "remark"; break;
case DiagnosticsEngine::Warning: OS << "warning"; break;
case DiagnosticsEngine::Error: OS << "error"; break;
case DiagnosticsEngine::Fatal: OS << "fatal error"; break;
}
// In clang-cl /fallback mode, print diagnostics as "error(clang):". This
// makes it more clear whether a message is coming from clang or cl.exe,
// and it prevents MSBuild from concluding that the build failed just because
// there is an "error:" in the output.
if (CLFallbackMode)
OS << "(clang)";
OS << ": ";
if (ShowColors)
OS.resetColor();
}
/*static*/
void TextDiagnostic::printDiagnosticMessage(raw_ostream &OS,
bool IsSupplemental,
StringRef Message,
unsigned CurrentColumn,
unsigned Columns, bool ShowColors) {
bool Bold = false;
if (ShowColors && !IsSupplemental) {
// Print primary diagnostic messages in bold and without color, to visually
// indicate the transition from continuation notes and other output.
OS.changeColor(savedColor, true);
Bold = true;
}
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';
}
void TextDiagnostic::emitFilename(StringRef Filename, const SourceManager &SM) {
SmallVector<char, 128> AbsoluteFilename;
if (DiagOpts->AbsolutePath) {
const DirectoryEntry *Dir = SM.getFileManager().getDirectory(
llvm::sys::path::parent_path(Filename));
if (Dir) {
StringRef DirName = SM.getFileManager().getCanonicalName(Dir);
llvm::sys::path::append(AbsoluteFilename, DirName,
llvm::sys::path::filename(Filename));
Filename = StringRef(AbsoluteFilename.data(), AbsoluteFilename.size());
}
}
OS << Filename;
}
/// 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(FullSourceLoc Loc, PresumedLoc PLoc,
DiagnosticsEngine::Level Level,
ArrayRef<CharSourceRange> Ranges) {
if (PLoc.isInvalid()) {
// At least print the file name if available:
FileID FID = Loc.getFileID();
if (FID.isValid()) {
const FileEntry *FE = Loc.getFileEntry();
if (FE && FE->isValid()) {
emitFilename(FE->getName(), Loc.getManager());
if (FE->isInPCH())
OS << " (in PCH)";
OS << ": ";
}
}
return;
}
unsigned LineNo = PLoc.getLine();
if (!DiagOpts->ShowLocation)
return;
if (DiagOpts->ShowColors)
OS.changeColor(savedColor, true);
emitFilename(PLoc.getFilename(), Loc.getManager());
switch (DiagOpts->getFormat()) {
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->getFormat() == DiagnosticOptions::MSVC) {
OS << ',';
// Visual Studio 2010 or earlier expects column number to be off by one
if (LangOpts.MSCompatibilityVersion &&
!LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2012))
ColNo--;
} else
OS << ':';
OS << ColNo;
}
switch (DiagOpts->getFormat()) {
case DiagnosticOptions::Clang:
case DiagnosticOptions::Vi: OS << ':'; break;
case DiagnosticOptions::MSVC:
// MSVC2013 and before print 'file(4) : error'. MSVC2015 gets rid of the
// space and prints 'file(4): error'.
OS << ')';
if (LangOpts.MSCompatibilityVersion &&
!LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015))
OS << ' ';
OS << ": ";
break;
}
if (DiagOpts->ShowSourceRanges && !Ranges.empty()) {
FileID CaretFileID = Loc.getExpansionLoc().getFileID();
bool PrintedRange = false;
for (ArrayRef<CharSourceRange>::const_iterator RI = Ranges.begin(),
RE = Ranges.end();
RI != RE; ++RI) {
// Ignore invalid ranges.
if (!RI->isValid()) continue;
auto &SM = Loc.getManager();
SourceLocation B = SM.getExpansionLoc(RI->getBegin());
CharSourceRange ERange = SM.getExpansionRange(RI->getEnd());
SourceLocation E = ERange.getEnd();
bool IsTokenRange = ERange.isTokenRange();
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 (IsTokenRange)
TokSize = Lexer::MeasureTokenLength(E, SM, LangOpts);
FullSourceLoc BF(B, SM), EF(E, SM);
OS << '{'
<< BF.getLineNumber() << ':' << BF.getColumnNumber() << '-'
<< EF.getLineNumber() << ':' << (EF.getColumnNumber() + TokSize)
<< '}';
PrintedRange = true;
}
if (PrintedRange)
OS << ':';
}
OS << ' ';
}
void TextDiagnostic::emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) {
if (DiagOpts->ShowLocation && PLoc.isValid())
OS << "In file included from " << PLoc.getFilename() << ':'
<< PLoc.getLine() << ":\n";
else
OS << "In included file:\n";
}
void TextDiagnostic::emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
StringRef ModuleName) {
if (DiagOpts->ShowLocation && PLoc.isValid())
OS << "In module '" << ModuleName << "' imported from "
<< PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
else
OS << "In module '" << ModuleName << "':\n";
}
void TextDiagnostic::emitBuildingModuleLocation(FullSourceLoc Loc,
PresumedLoc PLoc,
StringRef ModuleName) {
if (DiagOpts->ShowLocation && PLoc.isValid())
OS << "While building module '" << ModuleName << "' imported from "
<< PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
else
OS << "While building module '" << ModuleName << "':\n";
}
/// Find the suitable set of lines to show to include a set of ranges.
static llvm::Optional<std::pair<unsigned, unsigned>>
findLinesForRange(const CharSourceRange &R, FileID FID,
const SourceManager &SM) {
if (!R.isValid()) return None;
SourceLocation Begin = R.getBegin();
SourceLocation End = R.getEnd();
if (SM.getFileID(Begin) != FID || SM.getFileID(End) != FID)
return None;
return std::make_pair(SM.getExpansionLineNumber(Begin),
SM.getExpansionLineNumber(End));
}
/// Add as much of range B into range A as possible without exceeding a maximum
/// size of MaxRange. Ranges are inclusive.
static std::pair<unsigned, unsigned>
maybeAddRange(std::pair<unsigned, unsigned> A, std::pair<unsigned, unsigned> B,
unsigned MaxRange) {
// If A is already the maximum size, we're done.
unsigned Slack = MaxRange - (A.second - A.first + 1);
if (Slack == 0)
return A;
// Easy case: merge succeeds within MaxRange.
unsigned Min = std::min(A.first, B.first);
unsigned Max = std::max(A.second, B.second);
if (Max - Min + 1 <= MaxRange)
return {Min, Max};
// If we can't reach B from A within MaxRange, there's nothing to do.
// Don't add lines to the range that contain nothing interesting.
if ((B.first > A.first && B.first - A.first + 1 > MaxRange) ||
(B.second < A.second && A.second - B.second + 1 > MaxRange))
return A;
// Otherwise, expand A towards B to produce a range of size MaxRange. We
// attempt to expand by the same amount in both directions if B strictly
// contains A.
// Expand downwards by up to half the available amount, then upwards as
// much as possible, then downwards as much as possible.
A.second = std::min(A.second + (Slack + 1) / 2, Max);
Slack = MaxRange - (A.second - A.first + 1);
A.first = std::max(Min + Slack, A.first) - Slack;
A.second = std::min(A.first + MaxRange - 1, Max);
return A;
}
/// Highlight a SourceRange (with ~'s) for any characters on LineNo.
static void highlightRange(const CharSourceRange &R,
unsigned LineNo, FileID FID,
const SourceColumnMap &map,
std::string &CaretLine,
const SourceManager &SM,
const LangOptions &LangOpts) {
if (!R.isValid()) return;
SourceLocation Begin = R.getBegin();
SourceLocation End = R.getEnd();
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 = map.startOfNextColumn(StartColNo);
// Pick the last non-whitespace column.
if (EndColNo > map.getSourceLine().size())
EndColNo = map.getSourceLine().size();
while (EndColNo &&
(map.getSourceLine()[EndColNo-1] == ' ' ||
map.getSourceLine()[EndColNo-1] == '\t'))
EndColNo = map.startOfPreviousColumn(EndColNo);
// If the start/end passed each other, then we are trying to highlight a
// range that just exists in whitespace. That most likely means we have
// a multi-line highlighting range that covers a blank line.
if (StartColNo > EndColNo) {
assert(StartLineNo != EndLineNo && "trying to highlight whitespace");
StartColNo = EndColNo;
}
}
assert(StartColNo <= map.getSourceLine().size() && "Invalid range!");
assert(EndColNo <= map.getSourceLine().size() && "Invalid range!");
// Fill the range with ~'s.
StartColNo = map.byteToContainingColumn(StartColNo);
EndColNo = map.byteToContainingColumn(EndColNo);
assert(StartColNo <= EndColNo && "Invalid range!");
if (CaretLine.size() < EndColNo)
CaretLine.resize(EndColNo,' ');
std::fill(CaretLine.begin()+StartColNo,CaretLine.begin()+EndColNo,'~');
}
static std::string buildFixItInsertionLine(FileID FID,
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 (FID == HintLocInfo.first &&
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;
// This should NOT use HintByteOffset, because the source might have
// Unicode characters in earlier columns.
unsigned NewFixItLineSize = FixItInsertionLine.size() +
(HintCol - PrevHintEndCol) + I->CodeToInsert.size();
if (NewFixItLineSize > FixItInsertionLine.size())
FixItInsertionLine.resize(NewFixItLineSize, ' ');
std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
FixItInsertionLine.end() - I->CodeToInsert.size());
PrevHintEndCol =
HintCol + llvm::sys::locale::columnWidth(I->CodeToInsert);
}
}
}
expandTabs(FixItInsertionLine, DiagOpts->TabStop);
return FixItInsertionLine;
}
/// 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(
FullSourceLoc Loc, DiagnosticsEngine::Level Level,
SmallVectorImpl<CharSourceRange> &Ranges, ArrayRef<FixItHint> Hints) {
assert(Loc.isValid() && "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 = Loc.getDecomposedLoc();
FileID FID = LocInfo.first;
const SourceManager &SM = Loc.getManager();
// Get information about the buffer it points into.
bool Invalid = false;
StringRef BufData = Loc.getBufferData(&Invalid);
if (Invalid)
return;
unsigned CaretLineNo = Loc.getLineNumber();
unsigned CaretColNo = Loc.getColumnNumber();
// Arbitrarily stop showing snippets when the line is too long.
static const size_t MaxLineLengthToPrint = 4096;
if (CaretColNo > MaxLineLengthToPrint)
return;
// Find the set of lines to include.
const unsigned MaxLines = DiagOpts->SnippetLineLimit;
std::pair<unsigned, unsigned> Lines = {CaretLineNo, CaretLineNo};
for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
E = Ranges.end();
I != E; ++I)
if (auto OptionalRange = findLinesForRange(*I, FID, SM))
Lines = maybeAddRange(Lines, *OptionalRange, MaxLines);
for (unsigned LineNo = Lines.first; LineNo != Lines.second + 1; ++LineNo) {
const char *BufStart = BufData.data();
const char *BufEnd = BufStart + BufData.size();
// Rewind from the current position to the start of the line.
const char *LineStart =
BufStart +
SM.getDecomposedLoc(SM.translateLineCol(FID, LineNo, 1)).second;
if (LineStart == BufEnd)
break;
// Compute the line end.
const char *LineEnd = LineStart;
while (*LineEnd != '\n' && *LineEnd != '\r' && LineEnd != BufEnd)
++LineEnd;
// Arbitrarily stop showing snippets when the line is too long.
// FIXME: Don't print any lines in this case.
if (size_t(LineEnd - LineStart) > MaxLineLengthToPrint)
return;
// Trim trailing null-bytes.
StringRef Line(LineStart, LineEnd - LineStart);
while (!Line.empty() && Line.back() == '\0' &&
(LineNo != CaretLineNo || Line.size() > CaretColNo))
Line = Line.drop_back();
// Copy the line of code into an std::string for ease of manipulation.
std::string SourceLine(Line.begin(), Line.end());
// Build the byte to column map.
const SourceColumnMap sourceColMap(SourceLine, DiagOpts->TabStop);
// Create a line for the caret that is filled with spaces that is the same
// number of columns as the line of source code.
std::string CaretLine(sourceColMap.columns(), ' ');
// 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.
if (CaretLineNo == LineNo) {
CaretColNo = sourceColMap.byteToContainingColumn(CaretColNo - 1);
if (CaretLine.size() < CaretColNo + 1)
CaretLine.resize(CaretColNo + 1, ' ');
CaretLine[CaretColNo] = '^';
}
std::string FixItInsertionLine = buildFixItInsertionLine(
FID, LineNo, sourceColMap, Hints, SM, DiagOpts.get());
// 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.empty() && CaretLine[CaretLine.size() - 1] == ' ')
CaretLine.erase(CaretLine.end() - 1);
// Emit what we have computed.
emitSnippet(SourceLine);
if (!CaretLine.empty()) {
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';
}
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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