diff options
Diffstat (limited to 'src/mir/cleanup.cpp')
| -rw-r--r-- | src/mir/cleanup.cpp | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/mir/cleanup.cpp b/src/mir/cleanup.cpp index 49739e28..c5a8c5b9 100644 --- a/src/mir/cleanup.cpp +++ b/src/mir/cleanup.cpp @@ -692,6 +692,7 @@ void MIR_Cleanup_LValue(const ::MIR::TypeResolve& state, MirMutator& mutator, :: void MIR_Cleanup(const StaticTraitResolve& resolve, const ::HIR::ItemPath& path, ::MIR::Function& fcn, const ::HIR::Function::args_t& args, const ::HIR::TypeRef& ret_type) { Span sp; + TRACE_FUNCTION_F(path); ::MIR::TypeResolve state { sp, resolve, FMT_CB(ss, ss << path;), ret_type, args, fcn }; MirMutator mutator { fcn, 0, 0 }; @@ -778,6 +779,45 @@ void MIR_Cleanup(const StaticTraitResolve& resolve, const ::HIR::ItemPath& path, ) ) + if( se.src.is_Borrow() && se.src.as_Borrow().val.is_Field() ) + { + auto& e = se.src.as_Borrow(); + // TODO: If borrowing a !Sized value via a field access, create the DST + ::HIR::TypeRef tmp; + const auto& src_ty = state.get_lvalue_type(tmp, e.val); + + if( !resolve.type_is_sized(sp, src_ty) && !src_ty.m_data.is_Generic() ) + { + auto ty_unit_ptr = ::HIR::TypeRef::new_borrow( e.type, ::HIR::TypeRef::new_unit() ); + if( se.dst.is_Temporary() && state.get_lvalue_type(tmp, se.dst) == ty_unit_ptr ) + { + // Assigning fat pointer to a &() temporary, only happens if this has already happend + } + else + { + // Unwrap field accesses, next lvalue should be a deref + const ::MIR::LValue* lv = &e.val; + while( lv->is_Field() ) + lv = &*lv->as_Field().val; + MIR_ASSERT(state, lv->is_Deref(), "Access of !Sized field not via a deref"); + + const auto& dst_val_lval = *lv; + + auto meta_rval = ::MIR::RValue::make_DstMeta({ dst_val_lval.clone() }); + // TODO: How can the thin pointer to the field be obtained without tripping this twice? + auto ptr_rval = mv$( se.src ); + + // TODO: Get the metadata type. + auto meta_ty = ::HIR::TypeRef( ::HIR::CoreType::Usize ); + auto meta_lval = mutator.in_temporary( mv$(meta_ty), mv$(meta_rval) ); + + // HACK: Store the pointer as &() + auto ptr_lval = mutator.in_temporary( mv$(ty_unit_ptr), mv$(ptr_rval) ); + se.src = ::MIR::RValue::make_MakeDst({ mv$(ptr_lval), mv$(meta_lval) }); + } + } + } + if( se.src.is_Cast() ) { auto& e = se.src.as_Cast(); |