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clang-1/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/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, " ");
}
}
/// Look through spelling locations for a macro argument expansion, and
/// if found skip to it so that we can trace the argument rather than the macros
/// in which that argument is used. If no macro argument expansion is found,
/// don't skip anything and return the starting location.
static SourceLocation skipToMacroArgExpansion(const SourceManager &SM,
SourceLocation StartLoc) {
for (SourceLocation L = StartLoc; L.isMacroID();
L = SM.getImmediateSpellingLoc(L)) {
if (SM.isMacroArgExpansion(L))
return L;
}
// Otherwise just return initial location, there's nothing to skip.
return StartLoc;
}
/// Gets the location of the immediate macro caller, one level up the stack
/// toward the initial macro typed into the source.
static SourceLocation getImmediateMacroCallerLoc(const SourceManager &SM,
SourceLocation Loc) {
if (!Loc.isMacroID()) return Loc;
// When we have the location of (part of) an expanded parameter, its spelling
// location points to the argument as typed into the macro call, and
// therefore is used to locate the macro caller.
if (SM.isMacroArgExpansion(Loc))
return SM.getImmediateSpellingLoc(Loc);
// Otherwise, the caller of the macro is located where this macro is
// expanded (while the spelling is part of the macro definition).
return SM.getImmediateExpansionRange(Loc).first;
}
/// Gets the location of the immediate macro callee, one level down the stack
/// toward the leaf macro.
static SourceLocation getImmediateMacroCalleeLoc(const SourceManager &SM,
SourceLocation Loc) {
if (!Loc.isMacroID()) return Loc;
// When we have the location of (part of) an expanded parameter, its
// expansion location points to the unexpanded paramater reference within
// the macro definition (or callee).
if (SM.isMacroArgExpansion(Loc))
return SM.getImmediateExpansionRange(Loc).first;
// Otherwise, the callee of the macro is located where this location was
// spelled inside the macro definition.
return SM.getImmediateSpellingLoc(Loc);
}
/// Get the presumed location of a diagnostic message. This computes the
/// presumed location for the top of any macro backtrace when present.
static PresumedLoc getDiagnosticPresumedLoc(const SourceManager &SM,
SourceLocation Loc) {
// This is a condensed form of the algorithm used by emitCaretDiagnostic to
// walk to the top of the macro call stack.
while (Loc.isMacroID()) {
Loc = skipToMacroArgExpansion(SM, Loc);
Loc = getImmediateMacroCallerLoc(SM, Loc);
}
return SM.getPresumedLoc(Loc);
}
/// \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.
llvm::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.
llvm::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;
}
/// \brief Retrieve the name of the immediate macro expansion.
///
/// This routine starts from a source location, and finds the name of the macro
/// responsible for its immediate expansion. It looks through any intervening
/// macro argument expansions to compute this. It returns a StringRef which
/// refers to the SourceManager-owned buffer of the source where that macro
/// name is spelled. Thus, the result shouldn't out-live that SourceManager.
///
static StringRef getImmediateMacroName(SourceLocation Loc,
const SourceManager &SM,
const LangOptions &LangOpts) {
assert(Loc.isMacroID() && "Only reasonble to call this on macros");
// Walk past macro argument expanions.
while (SM.isMacroArgExpansion(Loc))
Loc = SM.getImmediateExpansionRange(Loc).first;
// Find the spelling location of the start of the non-argument expansion
// range. This is where the macro name was spelled in order to begin
// expanding this macro.
Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
// Dig out the buffer where the macro name was spelled and the extents of the
// name so that we can render it into the expansion note.
std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
}
TextDiagnostic::TextDiagnostic(raw_ostream &OS,
const SourceManager &SM,
const LangOptions &LangOpts,
const DiagnosticOptions &DiagOpts)
: OS(OS), SM(SM), LangOpts(LangOpts), DiagOpts(DiagOpts), LastLevel() {
}
void TextDiagnostic::emitDiagnostic(SourceLocation Loc,
DiagnosticsEngine::Level Level,
StringRef Message,
ArrayRef<CharSourceRange> Ranges,
ArrayRef<FixItHint> FixItHints) {
PresumedLoc PLoc = getDiagnosticPresumedLoc(SM, Loc);
// First, if this diagnostic is not in the main file, print out the
// "included from" lines.
emitIncludeStack(PLoc.getIncludeLoc(), Level);
uint64_t StartOfLocationInfo = OS.tell();
// Next 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);
// Only recurse if we have a valid location.
if (Loc.isValid()) {
// Get the ranges into a local array we can hack on.
SmallVector<CharSourceRange, 20> MutableRanges(Ranges.begin(),
Ranges.end());
for (ArrayRef<FixItHint>::const_iterator I = FixItHints.begin(),
E = FixItHints.end();
I != E; ++I)
if (I->RemoveRange.isValid())
MutableRanges.push_back(I->RemoveRange);
unsigned MacroDepth = 0;
emitMacroExpansionsAndCarets(Loc, Level, MutableRanges, FixItHints,
MacroDepth);
}
LastLoc = Loc;
LastLevel = Level;
}
/*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 Prints an include stack when appropriate for a particular
/// diagnostic level and location.
///
/// This routine handles all the logic of suppressing particular include
/// stacks (such as those for notes) and duplicate include stacks when
/// repeated warnings occur within the same file. It also handles the logic
/// of customizing the formatting and display of the include stack.
///
/// \param Level The diagnostic level of the message this stack pertains to.
/// \param Loc The include location of the current file (not the diagnostic
/// location).
void TextDiagnostic::emitIncludeStack(SourceLocation Loc,
DiagnosticsEngine::Level Level) {
// Skip redundant include stacks altogether.
if (LastIncludeLoc == Loc)
return;
LastIncludeLoc = Loc;
if (!DiagOpts.ShowNoteIncludeStack && Level == DiagnosticsEngine::Note)
return;
emitIncludeStackRecursively(Loc);
}
/// \brief Helper to recursivly walk up the include stack and print each layer
/// on the way back down.
void TextDiagnostic::emitIncludeStackRecursively(SourceLocation Loc) {
if (Loc.isInvalid())
return;
PresumedLoc PLoc = SM.getPresumedLoc(Loc);
if (PLoc.isInvalid())
return;
// Emit the other include frames first.
emitIncludeStackRecursively(PLoc.getIncludeLoc());
if (DiagOpts.ShowLocation)
OS << "In file included from " << PLoc.getFilename()
<< ':' << PLoc.getLine() << ":\n";
else
OS << "In included file:\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 << ' ';
}
/// \brief Recursively emit notes for each macro expansion and caret
/// diagnostics where appropriate.
///
/// Walks up the macro expansion stack printing expansion notes, the code
/// snippet, caret, underlines and FixItHint display as appropriate at each
/// level.
///
/// \param Loc The location for this caret.
/// \param Level The diagnostic level currently being emitted.
/// \param Ranges The underlined ranges for this code snippet.
/// \param Hints The FixIt hints active for this diagnostic.
/// \param MacroSkipEnd The depth to stop skipping macro expansions.
/// \param OnMacroInst The current depth of the macro expansion stack.
void TextDiagnostic::emitMacroExpansionsAndCarets(
SourceLocation Loc,
DiagnosticsEngine::Level Level,
SmallVectorImpl<CharSourceRange>& Ranges,
ArrayRef<FixItHint> Hints,
unsigned &MacroDepth,
unsigned OnMacroInst) {
assert(!Loc.isInvalid() && "must have a valid source location here");
// If this is a file source location, directly emit the source snippet and
// caret line. Also record the macro depth reached.
if (Loc.isFileID()) {
assert(MacroDepth == 0 && "We shouldn't hit a leaf node twice!");
MacroDepth = OnMacroInst;
emitSnippetAndCaret(Loc, Level, Ranges, Hints);
return;
}
// Otherwise recurse through each macro expansion layer.
// When processing macros, skip over the expansions leading up to
// a macro argument, and trace the argument's expansion stack instead.
Loc = skipToMacroArgExpansion(SM, Loc);
SourceLocation OneLevelUp = getImmediateMacroCallerLoc(SM, Loc);
// FIXME: Map ranges?
emitMacroExpansionsAndCarets(OneLevelUp, Level, Ranges, Hints, MacroDepth,
OnMacroInst + 1);
// Save the original location so we can find the spelling of the macro call.
SourceLocation MacroLoc = Loc;
// Map the location.
Loc = getImmediateMacroCalleeLoc(SM, Loc);
unsigned MacroSkipStart = 0, MacroSkipEnd = 0;
if (MacroDepth > DiagOpts.MacroBacktraceLimit) {
MacroSkipStart = DiagOpts.MacroBacktraceLimit / 2 +
DiagOpts.MacroBacktraceLimit % 2;
MacroSkipEnd = MacroDepth - DiagOpts.MacroBacktraceLimit / 2;
}
// Whether to suppress printing this macro expansion.
bool Suppressed = (OnMacroInst >= MacroSkipStart &&
OnMacroInst < MacroSkipEnd);
// Map the ranges.
for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
E = Ranges.end();
I != E; ++I) {
SourceLocation Start = I->getBegin(), End = I->getEnd();
if (Start.isMacroID())
I->setBegin(getImmediateMacroCalleeLoc(SM, Start));
if (End.isMacroID())
I->setEnd(getImmediateMacroCalleeLoc(SM, End));
}
if (Suppressed) {
// Tell the user that we've skipped contexts.
if (OnMacroInst == MacroSkipStart) {
// FIXME: Emit this as a real note diagnostic.
// FIXME: Format an actual diagnostic rather than a hard coded string.
OS << "note: (skipping " << (MacroSkipEnd - MacroSkipStart)
<< " expansions in backtrace; use -fmacro-backtrace-limit=0 to see "
"all)\n";
}
return;
}
llvm::SmallString<100> MessageStorage;
llvm::raw_svector_ostream Message(MessageStorage);
Message << "expanded from macro '"
<< getImmediateMacroName(MacroLoc, SM, LangOpts) << "'";
emitDiagnostic(SM.getSpellingLoc(Loc), DiagnosticsEngine::Note,
Message.str(),
Ranges, ArrayRef<FixItHint>());
}
/// \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";
}
}
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