[PATCH] D63423: [Diagnostics] Diagnose misused xor as pow

[JF Bastien via Phabricator via cfe-commits]

jfb added inline comments.


================
Comment at: lib/Sema/SemaExpr.cpp:10929
+    // Do not diagnose if xor keyword is used.
+    if (ExprStr.find("xor") != llvm::StringRef::npos)
+      return;
----------------
xbolva00 wrote:
> Quuxplusone wrote:
> > xbolva00 wrote:
> > > jfb wrote:
> > > > Doesn't this match any expression that contains `xor`? Put another way, I don't see `"xor"` used anywhere else under clang, what's usually done?
> > > Yes, but since xor is keyword in C++, I think this is safe.
> > I believe JF is worried about expressions like `constexpr int flexor_exponent = 3; return 10 ^ flexor_exponent;`. That expression contains the substring `"xor"` but does not use the `xor` keyword. Which reminds me, can you add some test cases showing what behavior you expect for operands that are not integer literals but still compile-time `const`, or `constexpr`, or template arguments?
> Ah, I will change it to “ xor “.
Spaces aren't the only valid whitespace character :)

```
2 xor
   31
```


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  https://reviews.llvm.org/D63423/new/

https://reviews.llvm.org/D63423