================
Comment at: clang-tidy/readability/RemoveVoidArg.cpp:174
@@ +173,3 @@
+void RemoveVoidArg::processFieldDecl(const MatchFinder::MatchResult &Result,
FieldDecl const *const Member) {
+ std::string const Text = getText(Result, *Member);
+ removeVoidArgumentTokens(Result, Member->getLocStart(), Text, "Redundant
void argument list in field declaration.");
----------------
LegalizeAdulthood wrote:
> sbenza wrote:
> > LegalizeAdulthood wrote:
> > > sbenza wrote:
> > > > LegalizeAdulthood wrote:
> > > > > sbenza wrote:
> > > > > > Any reason all of these convert the StringRef into a std::string?
> > > > > > Couldn't they work with the StringRef directly?
> > > > > I tried switching it to a StringRef, but when I tried to combine it
> > > > > with other text to build a replacement for diag(), it got turned into
> > > > > Twine and then failed to match any signature for diag(). I'm open to
> > > > > suggestions for what you'd like to see instead.
> > > > Twine::str() constructs the string.
> > > > I don't mind constructing a string when a match happens. Those are rare.
> > > > But we should avoid allocating memory when no match happens.
> > > > Right now temporary memory allocations are a considerable part of
> > > > clang-tidy's runtime. We should try to minimize that.
> > > I think we are at that stage now; I do all early-out testing before
> > > constructing the replacement string.
> > You are still generating a copy of the code before re-parsing it.
> > Those will happen for anything that passes the matcher, even if they have
> > no 'void' argument.
> > removeVoidArgumentTokens should take the code as a StringRef directly from
> > getText(), without converting to std::string first. GrammarLocation should
> > also be a StringRef.
> > Basically, avoid std::string until you are about to call diag().
> I'll look into having getText return the StringRef and using that. I don't
> understand the fuss over GrammarLocation, however. Before I had it as a
> constant string that was just passed through and then another review wanted
> the duplication in the message eliminated, so I pulled that out. Now you're
> saying that the string joining induced by the elimination of duplication is
> bad. It doesn't seem possible to satisfy both comments.
The problem with GrammarLocation is that it is declared as a 'const std::string
&' and you are always passing literals.
This is what StringRef is for. It will avoid the unnecessary temporary string.
The signature would read like:
void RemoveVoidArg::removeVoidArgumentTokens(
const MatchFinder::MatchResult &Result, SourceLocation StartLoc,
StringRef DeclText, StringRef GrammarLocation);
Then you can construct the Lexer with an std::string, like:
clang::Lexer PrototypeLexer(StartLoc, Result.Context->getLangOpts(),
DeclText.data(), DeclText.data(),
DeclText.data() + DeclText.length());
http://reviews.llvm.org/D7639
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