[cfe-dev] convert conditional expression to string

Csaba Dabis via cfe-dev cfe-dev at lists.llvm.org
Thu Dec 6 04:07:17 PST 2018


Hello!

There is a cool tutorial how to work with Clang Tidy:
https://youtu.be/1S2A0VWGOws (by Daniel Jasper and Manuel Klimek)

I have already implemented this based on the video.

Clang Tidy version:

static StringRef exprToStr(const Expr *E,
                           const MatchFinder::MatchResult &Result) {
  return Lexer::getSourceText(
      CharSourceRange::getTokenRange(E->getSourceRange()),
      *Result.SourceManager, Result.Context->getLangOpts(), 0);
}


Static Analyzer version:

static StringRef exprToStr(const Expr *E, BugReporterContext &BRC) {
  return Lexer::getSourceText(
      CharSourceRange::getTokenRange(E->getSourceRange()),
      BRC.getSourceManager(), BRC.getASTContext().getLangOpts(), 0);
}

2018. dec. 6. 5:39 ezt írta ("Kihong Heo via cfe-dev" <
cfe-dev at lists.llvm.org>):

Thanks.

It seems Expr::getSourceRange() returns the range of the first token.
Then, in this particular case, what is the most common way to get the last
token of the expression? How can I get “x < 10”?

Best,
Kihong

2018. 12. 2. 오후 1:30, Richard Smith <richard at metafoo.co.uk> 작성:

On Sat, 1 Dec 2018, 22:16 Alexey Sidorin via cfe-dev <cfe-dev at lists.llvm.org
 wrote:

> Hi Kihong,
> The problem in your particular case is that the begin location of
> integer literal is reported as the end location (should we fix it in AST)?
>

No, that's just how clang represents source ranges: source ranges are
inclusive and source locations are the locations of tokens. So the start
and end location of an integer literal should be the same, and the user
needs to find the end of the last token themselves.

As a workaround, you can try to use Lexer::getLocForEndOfToken() to get
> the token end location for the location reported by getLocEnd().
>
> 02.12.2018 8:36, Kihong Heo via cfe-dev пишет:
> > Hi all,
> >
> > How can I get string representations of conditional expressions of
> IfStmt?
> > The problem is as follows:
> > For example;
> > =============
> > /* source code */
> > if( x < 10) …
> > =============
> >
> > “IS->getCond()->getSourceRange()” represents only “x <“. It seems quite
> strange.
> >
> > Thanks,
> > Kihong
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
>
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