rsmith added inline comments.
================
Comment at: clang/lib/AST/ExprConstant.cpp:5447
+
+ case APValue::LValue: {
+ LValue LVal;
----------------
jfb wrote:
> rsmith wrote:
> > This will permit bitcasts from `nullptr_t`, providing a zero value. I think
> > that's wrong; the bit representation of `nullptr_t` is notionally
> > uninitialized (despite strangely having pointer size and alignment).
> >
> > I think this is a specification bug: `bit_cast<intptr_t>(nullptr)` should
> > be non-constant (it won't necessarily be `0` at runtime) but the current
> > wording doesn't seem to permit us to treat it as non-constant.
> You brought this up in ABQ, the outcome was... poor notes so I have no idea
> what Core decided...
It looks like we never actually resolved what happens in this case ;-(
================
Comment at: clang/lib/AST/ExprConstant.cpp:5549
+ // Ideally this will be unreachable.
+ llvm::NoneType unsupportedType(QualType Ty) {
+ Info.FFDiag(BCE->getBeginLoc(),
----------------
Support for bitcasting to `nullptr_t` seems to be missing.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D62825/new/
https://reviews.llvm.org/D62825
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