diff options
Diffstat (limited to 'src/mir/from_hir.cpp')
| -rw-r--r-- | src/mir/from_hir.cpp | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/mir/from_hir.cpp b/src/mir/from_hir.cpp index 8cbb55d2..6727ab4b 100644 --- a/src/mir/from_hir.cpp +++ b/src/mir/from_hir.cpp @@ -621,7 +621,31 @@ namespace { TU_MATCH_DEF( ::HIR::TypeRef::Data, (ty_out.m_data), (e), ( - TODO(node.span(), "MIR _Unsize to " << ty_out); + TODO(node.span(), "MIR _Unsize to &[mut] " << ty_out); + ), + // TODO: Unsize custom types containing a ?Size generic - See the Unsize trait + //(Path, + // ), + //(Generic, + // ), + (Slice, + if( ty_in.m_data.is_Array() ) + { + const auto& in_array = ty_in.m_data.as_Array(); + auto size_lval = m_builder.lvalue_or_temp( ::HIR::TypeRef(::HIR::CoreType::Usize), ::MIR::Constant( static_cast<uint64_t>(in_array.size_val) ) ); + m_builder.set_result( node.span(), ::MIR::RValue::make_MakeDst({ mv$(ptr_lval), mv$(size_lval) }) ); + } + else if( ty_in.m_data.is_Generic() ) + { + // HACK: FixedSizeArray uses `A: Unsize<[T]>` which will lead to the above code not working (as the size isn't known). + // - Maybe _Meta on the `&A` would work as a stopgap (since A: Sized, it won't collide with &[T] or similar) + auto size_lval = m_builder.lvalue_or_temp( ::HIR::TypeRef(::HIR::CoreType::Usize), ::MIR::RValue::make_DstMeta({ ptr_lval.clone() }) ); + m_builder.set_result( node.span(), ::MIR::RValue::make_MakeDst({ mv$(ptr_lval), mv$(size_lval) }) ); + } + else + { + ASSERT_BUG(node.span(), ty_in.m_data.is_Array(), "Unsize to slice from non-array - " << ty_in); + } ), (TraitObject, // TODO: Obtain the vtable if the destination is a trait object |