hazohelet added a comment.
Thanks everyone for the comments!
================
Comment at: clang/test/Lexer/cxx1z-trigraphs.cpp:24
// expected-error@11 {{}} expected-warning@11 {{trigraph ignored}}
-// expected-error@13 {{failed}} expected-warning@13 {{trigraph ignored}}
expected-note@13 {{evaluates to ''?' == '#''}}
+// expected-error@13 {{failed}} expected-warning@13 {{trigraph ignored}}
expected-note@13 {{evaluates to '63 == 35'}}
// expected-error@16 {{}}
----------------
cor3ntin wrote:
> tahonermann wrote:
> > aaron.ballman wrote:
> > > I think the original diagnostic was actually more understandable as it
> > > relates more closely to what's written in the static assertion. I could
> > > imagine something like `evaluates to '?' (63) == '#' (35)` would also be
> > > reasonable.
> > I agree. I would also be ok with printing the integer value as primary with
> > the character as secondary:
> > evaluates to 63 ('?') == 35 ('#')
> >
> > There are two kinds of non-printable characters:
> > # Control characters (including new-line)
> > # character values that don't correspond to a character (e.g., lone
> > trailing characters or invalid code unit values).
> > For the first case, I would support printing them as either C escapes or
> > universal-character-names. e.g.,
> > evaluates to 0 ('\0') == 1 (\u0001)
> > For the second case, I would support printing them as C hex escapes. e.g,
> > evaluates to -128 ('\x80') == -123 ('\x85')
> >
> >
> > For the first case, I would support printing them as either C escapes or
> > universal-character-names. e.g.,
>
> As mentioned before, we should be consistent with what we do for diagnostics
> messages in general - (`ie `pushEscapedString`).
> I check and we already do that. https://godbolt.org/z/doah9YGMT
>
> Question is, why do we sometimes don't?
> Note that in general i don't have an opinion about displaying the value of
> characters literal _in addition_ of the character itself, it seems like a
> good thing)
The character escape in the current error message is handled in
`CharacterLiteral::print`
(https://github.com/llvm/llvm-project/blob/fcb6a9c07cf7a2bc63d364e3b7f60aaadadd57cc/clang/lib/AST/Expr.cpp#L1064-L1083),
and the reason for `'\0'` being escaped to `\x00` and `'\u{9}'` escaped to
`\t` is that `escapeCStyle` does not escape null character
(https://github.com/llvm/llvm-project/blob/c1c86f9eae73786bcdacddaab248817c4f176935/clang/include/clang/Basic/CharInfo.h#L174-L200).
`pushEscapedString` does not escape whitespace characters, so we should use
`escapeCStyle` if we are to use c-style escape for them.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D155610/new/
https://reviews.llvm.org/D155610
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