Trait rustc_codegen_ssa::traits::LayoutTypeMethods

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pub trait LayoutTypeMethods<'tcx>: Backend<'tcx> {
    // Required methods
    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;
    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;
    fn backend_field_index(
        &self,
        layout: TyAndLayout<'tcx>,
        index: usize
    ) -> u64;
    fn scalar_pair_element_backend_type(
        &self,
        layout: TyAndLayout<'tcx>,
        index: usize,
        immediate: bool
    ) -> Self::Type;
}

Required Methods§

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fn backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type

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.

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fn immediate_backend_type(&self, layout: TyAndLayout<'tcx>) -> 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 and to_immediate_scalar.

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