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add better comments. 

llvm-svn: 39904
This commit is contained in:
Chris Lattner 2007-07-16 06:46:50 +00:00
parent b0f5d55912
commit eb5b20ae48
1 changed files with 7 additions and 5 deletions
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12
clang/Driver/TextDiagnosticPrinter.cpp
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@ -101,12 +101,14 @@ void TextDiagnosticPrinter::HighlightRange(const SourceRange &R,
/// 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) {
const char *StrData =
SourceMgr.getCharacterData(SourceMgr.getLogicalLoc(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);
// Note, this could be special cased for common tokens like identifiers, ')',
// etc to make this faster, if it mattered.
// 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.