gccrs: Support ZST type checking for #[repr(transparent)]#4698
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gccrs: Support ZST type checking for #[repr(transparent)]#4698Polygonalr wants to merge 1 commit into
#[repr(transparent)]#4698Polygonalr wants to merge 1 commit into
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gcc/rust/ChangeLog: * typecheck/rust-tyty.h (BaseType::is_zero_sized): New function. (TupleType::is_zero_sized): New function. (ArrayType::is_zero_sized): New function. (ADTType::is_zero_sized): New function. * typecheck/rust-tyty.cc (BaseType::is_zero_sized): Implement checking of whether a type is zero-sized. (TupleType::is_zero_sized): Ditto. (ArrayType::is_zero_sized): Ditto. (ADTType::is_zero_sized): Ditto. * typecheck/rust-hir-type-check-item.cc (TypeCheckItem::visit (StructStruct)): Update transparent repr type-checking to check for zero-sized members. * backend/rust-compile-type.cc (TyTyResolveCompile::visit (TyTy::ADTType)): Support compilation of transparent repr structs with more than 1 fields. gcc/testsuite/ChangeLog: * rust/compile/repr_transparent_fields.rs: Add new test case with PhantomData. Signed-Off-By: Yap Zhi Heng <yapzhhg@gmail.com>
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Zero-sized types such as
PhantomDatacan be additional members of a#[repr(transparent)]struct besides the single non-zero-sized, so this PR supports type-checking them.