tbaeder added inline comments.
================
Comment at: clang/lib/AST/Interp/ByteCodeExprGen.cpp:1213
std::optional<PrimType> SubExprT = classify(SubExpr);
- if (E->getStorageDuration() == SD_Static) {
+ bool IsStatic = E->getStorageDuration() == SD_Static;
+ if (GlobalDecl || IsStatic) {
----------------
aaron.ballman wrote:
> tbaeder wrote:
> > aaron.ballman wrote:
> > > Should we be looking at the TLS kind of the extended declaration?
> > > (`CheckCompleteVariableDeclaration()` is using `VarDecl::getTLSKind() ==
> > > VarDecl::TLS_Static`)
> > >
> > > Would something along these lines work instead?
> > > ```
> > > bool EmitGlobalTemp = E->getStorageDuration() == SD_Static;
> > > if (!EmitGlobalTemp) {
> > > if (const LifetimeExtendedTemporaryDecl *LETD =
> > > E->getLifetimeExtendedTemporaryDecl()) {
> > > if (const auto *VD =
> > > dyn_cast_if_present<VarDecl>(LETD->getExtendingDecl()) {
> > > EmitGlobalTemp= VD->getTLSKind() == VarDecl::TLS_Static;
> > > }
> > > }
> > > }
> > > ```
> > That code definitely works for the current `AST/Interp/` tests, but we
> > don't have tests for thread local stuff in there right now.
> Hmm, I think we'll need those tests: https://eel.is/c++draft/expr.const#5.2
>
> That seems to be the only mention about thread local storage duration for
> constant expressions in C++, so it might make sense to tackle that as part of
> this change?
>
> (I worry that we'll forget to come back to this detail later, basically. So
> either we should have failing test coverage showing we need a fix, an issue
> in GitHub so we know to come back to it, etc. or just do the work up front
> given that it's closely related.)
I've pushed
https://github.com/llvm/llvm-project/commit/11f5e5eb90c883d4b9ddba318e8fc57914b22ef3
As you can see, the problem also exists for static variables. I think this
needs additional checks at interpretation time, or even new opcodes to check
the declaration when the initializer is computed. So I'd rather have this in a
separate followup patch.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D156453/new/
https://reviews.llvm.org/D156453
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