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//===--- TextDiagnosticPrinter.cpp - Diagnostic Printer -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Bill Wendling and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This diagnostic client prints out their diagnostic messages.
//
//===----------------------------------------------------------------------===//
#include "TextDiagnosticPrinter.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Lexer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include <iostream>
#include <string>
using namespace clang;
static llvm::cl::opt<bool>
NoShowColumn("fno-show-column",
llvm::cl::desc("Do not include column number on diagnostics"));
static llvm::cl::opt<bool>
NoCaretDiagnostics("fno-caret-diagnostics",
llvm::cl::desc("Do not include source line and caret with"
" diagnostics"));
void TextDiagnosticPrinter::
PrintIncludeStack(SourceLocation Pos) {
if (Pos.isInvalid()) return;
Pos = SourceMgr.getLogicalLoc(Pos);
// Print out the other include frames first.
PrintIncludeStack(SourceMgr.getIncludeLoc(Pos));
unsigned LineNo = SourceMgr.getLineNumber(Pos);
std::cerr << "In file included from " << SourceMgr.getSourceName(Pos)
<< ":" << LineNo << ":\n";
}
/// HighlightRange - Given a SourceRange and a line number, highlight (with ~'s)
/// any characters in LineNo that intersect the SourceRange.
void TextDiagnosticPrinter::HighlightRange(const SourceRange &R,
unsigned LineNo,
std::string &CaratLine,
const std::string &SourceLine) {
assert(CaratLine.size() == SourceLine.size() &&
"Expect a correspondence between source and carat line!");
if (!R.isValid()) return;
unsigned StartLineNo = SourceMgr.getLogicalLineNumber(R.Begin());
if (StartLineNo > LineNo) return; // No intersection.
unsigned EndLineNo = SourceMgr.getLogicalLineNumber(R.End());
if (EndLineNo < LineNo) return; // No intersection.
// Compute the column number of the start.
unsigned StartColNo = 0;
if (StartLineNo == LineNo) {
StartColNo = SourceMgr.getLogicalColumnNumber(R.Begin());
if (StartColNo) --StartColNo; // Zero base the col #.
}
// Pick the first non-whitespace column.
while (StartColNo < SourceLine.size() &&
(SourceLine[StartColNo] == ' ' || SourceLine[StartColNo] == '\t'))
++StartColNo;
// Compute the column number of the end.
unsigned EndColNo = CaratLine.size();
if (EndLineNo == LineNo) {
EndColNo = SourceMgr.getLogicalColumnNumber(R.End());
if (EndColNo) {
--EndColNo; // Zero base the col #.
// Add in the length of the token, so that we cover multi-char tokens.
EndColNo += GetTokenLength(R.End());
} else {
EndColNo = CaratLine.size();
}
}
// Pick the last non-whitespace column.
while (EndColNo-1 &&
(SourceLine[EndColNo-1] == ' ' || SourceLine[EndColNo-1] == '\t'))
--EndColNo;
// Fill the range with ~'s.
assert(StartColNo <= EndColNo && "Invalid range!");
for (unsigned i = StartColNo; i != EndColNo; ++i)
CaratLine[i] = '~';
}
/// GetTokenLength - Given the source location of a token, determine its length.
/// This is a fully general function that uses a lexer to relex the token.
unsigned TextDiagnosticPrinter::GetTokenLength(SourceLocation Loc) {
// If this comes from a macro expansion, we really do want the macro name, not
// the token this macro expanded to.
Loc = SourceMgr.getLogicalLoc(Loc);
const char *StrData = SourceMgr.getCharacterData(Loc);
// TODO: this could be special cased for common tokens like identifiers, ')',
// etc to make this faster, if it mattered. This could use
// Lexer::isObviouslySimpleCharacter for example.
unsigned FileID = Loc.getFileID();
// Create a lexer starting at the beginning of this token.
Lexer TheLexer(SourceMgr.getBuffer(FileID), Loc,
*ThePreprocessor, StrData);
LexerToken TheTok;
TheLexer.LexRawToken(TheTok);
return TheTok.getLength();
}
void TextDiagnosticPrinter::HandleDiagnostic(Diagnostic::Level Level,
SourceLocation Pos,
diag::kind ID,
const std::string *Strs,
unsigned NumStrs,
const SourceRange *Ranges,
unsigned NumRanges) {
unsigned LineNo = 0, ColNo = 0;
const char *LineStart = 0, *LineEnd = 0;
if (Pos.isValid()) {
SourceLocation LPos = SourceMgr.getLogicalLoc(Pos);
LineNo = SourceMgr.getLineNumber(LPos);
// First, if this diagnostic is not in the main file, print out the
// "included from" lines.
if (LastWarningLoc != SourceMgr.getIncludeLoc(LPos)) {
LastWarningLoc = SourceMgr.getIncludeLoc(LPos);
PrintIncludeStack(LastWarningLoc);
}
// Compute the column number. Rewind from the current position to the start
// of the line.
ColNo = SourceMgr.getColumnNumber(LPos);
const char *TokLogicalPtr = SourceMgr.getCharacterData(LPos);
LineStart = TokLogicalPtr-ColNo+1; // Column # is 1-based
// Compute the line end. Scan forward from the error position to the end of
// the line.
const llvm::MemoryBuffer *Buffer = SourceMgr.getBuffer(LPos.getFileID());
const char *BufEnd = Buffer->getBufferEnd();
LineEnd = TokLogicalPtr;
while (LineEnd != BufEnd &&
*LineEnd != '\n' && *LineEnd != '\r')
++LineEnd;
std::cerr << Buffer->getBufferIdentifier()
<< ":" << LineNo << ":";
if (ColNo && !NoShowColumn)
std::cerr << ColNo << ":";
std::cerr << " ";
}
switch (Level) {
default: assert(0 && "Unknown diagnostic type!");
case Diagnostic::Note: std::cerr << "note: "; break;
case Diagnostic::Warning: std::cerr << "warning: "; break;
case Diagnostic::Error: std::cerr << "error: "; break;
case Diagnostic::Fatal: std::cerr << "fatal error: "; break;
case Diagnostic::Sorry: std::cerr << "sorry, unimplemented: ";
break;
}
std::cerr << FormatDiagnostic(Level, ID, Strs, NumStrs) << "\n";
if (!NoCaretDiagnostics && Pos.isValid()) {
// Get the line of the source file.
std::string SourceLine(LineStart, LineEnd);
// Create a line for the carat that is filled with spaces that is the same
// length as the line of source code.
std::string CaratLine(LineEnd-LineStart, ' ');
// Highlight all of the characters covered by Ranges with ~ characters.
for (unsigned i = 0; i != NumRanges; ++i)
HighlightRange(Ranges[i], LineNo, CaratLine, SourceLine);
// Next, insert the carat itself.
if (ColNo-1 < CaratLine.size())
CaratLine[ColNo-1] = '^';
else
CaratLine.push_back('^');
// Scan the source line, looking for tabs. If we find any, manually expand
// them to 8 characters and update the CaratLine to match.
for (unsigned i = 0; i != SourceLine.size(); ++i) {
if (SourceLine[i] != '\t') continue;
// Replace this tab with at least one space.
SourceLine[i] = ' ';
// Compute the number of spaces we need to insert.
unsigned NumSpaces = ((i+8)&~7) - (i+1);
assert(NumSpaces < 8 && "Invalid computation of space amt");
// Insert spaces into the SourceLine.
SourceLine.insert(i+1, NumSpaces, ' ');
// Insert spaces or ~'s into CaratLine.
CaratLine.insert(i+1, NumSpaces, CaratLine[i] == '~' ? '~' : ' ');
}
// Finally, remove any blank spaces from the end of CaratLine.
while (CaratLine[CaratLine.size()-1] == ' ')
CaratLine.erase(CaratLine.end()-1);
// Emit what we have computed.
std::cerr << SourceLine << "\n";
std::cerr << CaratLine << "\n";
}
}
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