David BlaikieandChristopher Di Bella d99b767dde Export fields of imported Carbon classes to C++ (#8021) ...

When a Carbon class from another library was used from C++, its fields
were never exported, so C++ member access failed with 'no member named'.
The class scope of an imported class holds import references rather than
`FieldDecl`s, so `LookupClassFieldByStructField` didn't find them.
Resolve scope entries to their constant `FieldDecl`, load the import
references before exporting fields, and consistently key exported fields
by the `FieldDecl`.

Unfortunately `SemIR::LookupClassFieldByStructField` can't call
`LoadImportRef` because `SemIR::LookupClassFieldByStructField` is in
`SemIR` and `LoadImportRef` needs a `Check::Context` (and `check`
depends on `sem_ir`, not the other way around, so `sem_ir` can't use
check). So instead, make a `Check::LookupClassFieldByStructField` that
wraps the `SemIR` version, and does the `LoadImportRef`

Assisted-By: Claude

---------

Co-authored-by: Christopher Di Bella <cjdb.ns@gmail.com>

2026-11-02 20:37:01 +00:00

..

class.carbon

Give Carbon thunks for C++ callers linkonce_odr linkage (#8022)

2026-11-02 18:53:01 +00:00

destroy_from_thunk.carbon

Move SubobjectDestroy and SelfDestruct out of interface Destroy (#7942)

2026-10-26 21:35:01 +00:00

field_imported.carbon

Export fields of imported Carbon classes to C++ (#8021)

2026-11-02 20:37:01 +00:00

generic.carbon

Include the Carbon package name in the exported C++ namespace. (#7935)

2026-10-15 20:26:05 +00:00

mangle.carbon

Include the Carbon package name in the exported C++ namespace. (#7935)

2026-10-15 20:26:05 +00:00

method.carbon

Give Carbon thunks for C++ callers linkonce_odr linkage (#8022)

2026-11-02 18:53:01 +00:00