Instead of having `State::getLangOpts()`, which does a virtual call to
`getASTContext()` to call `getLangOpts()` on that, just move
`getLangOpts()` to the subclasses so we can do that without the virtual
call. We never call `getLangOpts()` in `State.cpp`, so it's not needed
in the base class.
Make it an enum class and move the enum to State.h as well as the
`EvalMode` member to `State`. This is in preparation of using the
evaluation mode from `InterpState` as well.
Instead of relaying from InterpState to the parent state (which is an
EvalInfo), just save the variables in State instead, so both subclasses
have access to it.
Per [decl.ref],
> Because a null pointer value or a pointer past the end of an object
does not point to an object, a reference in a well-defined program
cannot refer to such things.
Note this does not fixes the new bytecode interpreter.
Fixes#48665
[P2641R4](https://wg21.link/P2641R4)
This new builtin function is declared `consteval`. Support for
`-fexperimental-new-constant-interpreter` will be added in a later
patch.
---------
Co-authored-by: cor3ntin <corentinjabot@gmail.com>
The new constant interpreter's `clang::interp::InterpState` contains
both `clang::interp::Context` and `clang::ASTContext`. So using `S.Ctx`
and `S.getCtx()` was a bit confusing. This PR rename `getCtx()` to
`getASTContext` to make things more clearer.
Signed-off-by: yronglin <yronglin777@gmail.com>
