src/librustc_codegen_ssa/traits/type_.rs

   1 use super::misc::MiscMethods;
   2 use super::Backend;
   3 use super::HasCodegen;
   4 use crate::common::TypeKind;
   5 use crate::mir::place::PlaceRef;
   6 use rustc_middle::ty::layout::TyAndLayout;
   7 use rustc_middle::ty::{self, Ty};
   8 use rustc_span::DUMMY_SP;
   9 use rustc_target::abi::call::{ArgAbi, CastTarget, FnAbi, Reg};
  10 use rustc_target::abi::Integer;
  11
  12 // This depends on `Backend` and not `BackendTypes`, because consumers will probably want to use
  13 // `LayoutOf` or `HasTyCtxt`. This way, they don't have to add a constraint on it themselves.
  14 pub trait BaseTypeMethods<'tcx>: Backend<'tcx> {
  15     fn type_i1(&self) -> Self::Type;
  16     fn type_i8(&self) -> Self::Type;
  17     fn type_i16(&self) -> Self::Type;
  18     fn type_i32(&self) -> Self::Type;
  19     fn type_i64(&self) -> Self::Type;
  20     fn type_i128(&self) -> Self::Type;
  21     fn type_isize(&self) -> Self::Type;
  22
  23     fn type_f32(&self) -> Self::Type;
  24     fn type_f64(&self) -> Self::Type;
  25
  26     fn type_func(&self, args: &[Self::Type], ret: Self::Type) -> Self::Type;
  27     fn type_struct(&self, els: &[Self::Type], packed: bool) -> Self::Type;
  28     fn type_kind(&self, ty: Self::Type) -> TypeKind;
  29     fn type_ptr_to(&self, ty: Self::Type) -> Self::Type;
  30     fn element_type(&self, ty: Self::Type) -> Self::Type;
  31
  32     /// Returns the number of elements in `self` if it is a LLVM vector type.
  33     fn vector_length(&self, ty: Self::Type) -> usize;
  34
  35     fn float_width(&self, ty: Self::Type) -> usize;
  36
  37     /// Retrieves the bit width of the integer type `self`.
  38     fn int_width(&self, ty: Self::Type) -> u64;
  39
  40     fn val_ty(&self, v: Self::Value) -> Self::Type;
  41 }
  42
  43 pub trait DerivedTypeMethods<'tcx>: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {
  44     fn type_i8p(&self) -> Self::Type {
  45         self.type_ptr_to(self.type_i8())
  46     }
  47
  48     fn type_int(&self) -> Self::Type {
  49         match &self.sess().target.target.target_c_int_width[..] {
  50             "16" => self.type_i16(),
  51             "32" => self.type_i32(),
  52             "64" => self.type_i64(),
  53             width => bug!("Unsupported target_c_int_width: {}", width),
  54         }
  55     }
  56
  57     fn type_from_integer(&self, i: Integer) -> Self::Type {
  58         use Integer::*;
  59         match i {
  60             I8 => self.type_i8(),
  61             I16 => self.type_i16(),
  62             I32 => self.type_i32(),
  63             I64 => self.type_i64(),
  64             I128 => self.type_i128(),
  65         }
  66     }
  67
  68     fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
  69         ty.needs_drop(self.tcx(), ty::ParamEnv::reveal_all())
  70     }
  71
  72     fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
  73         ty.is_sized(self.tcx().at(DUMMY_SP), ty::ParamEnv::reveal_all())
  74     }
  75
  76     fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
  77         ty.is_freeze(self.tcx().at(DUMMY_SP), ty::ParamEnv::reveal_all())
  78     }
  79
  80     fn type_has_metadata(&self, ty: Ty<'tcx>) -> bool {
  81         let param_env = ty::ParamEnv::reveal_all();
  82         if ty.is_sized(self.tcx().at(DUMMY_SP), param_env) {
  83             return false;
  84         }
  85
  86         let tail = self.tcx().struct_tail_erasing_lifetimes(ty, param_env);
  87         match tail.kind {
  88             ty::Foreign(..) => false,
  89             ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
  90             _ => bug!("unexpected unsized tail: {:?}", tail),
  91         }
  92     }
  93 }
  94
  95 impl<T> DerivedTypeMethods<'tcx> for T where Self: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {}
  96
  97 pub trait LayoutTypeMethods<'tcx>: Backend<'tcx> {
  98     fn backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type;
  99     fn cast_backend_type(&self, ty: &CastTarget) -> Self::Type;
 100     fn fn_ptr_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> Self::Type;
 101     fn reg_backend_type(&self, ty: &Reg) -> Self::Type;
 102     fn immediate_backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type;
 103     fn is_backend_immediate(&self, layout: TyAndLayout<'tcx>) -> bool;
 104     fn is_backend_scalar_pair(&self, layout: TyAndLayout<'tcx>) -> bool;
 105     fn backend_field_index(&self, layout: TyAndLayout<'tcx>, index: usize) -> u64;
 106     fn scalar_pair_element_backend_type(
 107         &self,
 108         layout: TyAndLayout<'tcx>,
 109         index: usize,
 110         immediate: bool,
 111     ) -> Self::Type;
 112 }
 113
 114 pub trait ArgAbiMethods<'tcx>: HasCodegen<'tcx> {
 115     fn store_fn_arg(
 116         &mut self,
 117         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 118         idx: &mut usize,
 119         dst: PlaceRef<'tcx, Self::Value>,
 120     );
 121     fn store_arg(
 122         &mut self,
 123         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 124         val: Self::Value,
 125         dst: PlaceRef<'tcx, Self::Value>,
 126     );
 127     fn arg_memory_ty(&self, arg_abi: &ArgAbi<'tcx, Ty<'tcx>>) -> Self::Type;
 128 }
 129
 130 pub trait TypeMethods<'tcx>: DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> {}
 131
 132 impl<T> TypeMethods<'tcx> for T where Self: DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> {}