diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa/src/traits/type_.rs')
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/traits/type_.rs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/traits/type_.rs b/compiler/rustc_codegen_ssa/src/traits/type_.rs index 109161ccc..32905b079 100644 --- a/compiler/rustc_codegen_ssa/src/traits/type_.rs +++ b/compiler/rustc_codegen_ssa/src/traits/type_.rs @@ -100,11 +100,22 @@ pub trait DerivedTypeMethods<'tcx>: BaseTypeMethods<'tcx> + MiscMethods<'tcx> { impl<'tcx, T> DerivedTypeMethods<'tcx> for T where Self: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {} pub trait LayoutTypeMethods<'tcx>: Backend<'tcx> { + /// The backend type used for a rust type when it's in memory, + /// such as when it's stack-allocated or when it's being loaded or stored. fn backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type; fn cast_backend_type(&self, ty: &CastTarget) -> Self::Type; fn fn_decl_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> Self::Type; fn fn_ptr_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> Self::Type; fn reg_backend_type(&self, ty: &Reg) -> Self::Type; + /// The backend type used for a rust type when it's in an SSA register. + /// + /// For nearly all types this is the same as the [`Self::backend_type`], however + /// `bool` (and other `0`-or-`1` values) are kept as [`BaseTypeMethods::type_i1`] + /// in registers but as [`BaseTypeMethods::type_i8`] in memory. + /// + /// Converting values between the two different backend types is done using + /// [`from_immediate`](super::BuilderMethods::from_immediate) and + /// [`to_immediate_scalar`](super::BuilderMethods::to_immediate_scalar). fn immediate_backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type; fn is_backend_immediate(&self, layout: TyAndLayout<'tcx>) -> bool; fn is_backend_scalar_pair(&self, layout: TyAndLayout<'tcx>) -> bool; |