compiler/rustc_codegen_ssa/src/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::{AddressSpace, 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 type_ptr_to_ext(&self, ty: Self::Type, address_space: AddressSpace) -> Self::Type;
  31     fn element_type(&self, ty: Self::Type) -> Self::Type;
  32
  33     /// Returns the number of elements in `self` if it is a LLVM vector type.
  34     fn vector_length(&self, ty: Self::Type) -> usize;
  35
  36     fn float_width(&self, ty: Self::Type) -> usize;
  37
  38     /// Retrieves the bit width of the integer type `self`.
  39     fn int_width(&self, ty: Self::Type) -> u64;
  40
  41     fn val_ty(&self, v: Self::Value) -> Self::Type;
  42 }
  43
  44 pub trait DerivedTypeMethods<'tcx>: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {
  45     fn type_i8p(&self) -> Self::Type {
  46         self.type_i8p_ext(AddressSpace::DATA)
  47     }
  48
  49     fn type_i8p_ext(&self, address_space: AddressSpace) -> Self::Type {
  50         self.type_ptr_to_ext(self.type_i8(), address_space)
  51     }
  52
  53     fn type_int(&self) -> Self::Type {
  54         match &self.sess().target.c_int_width[..] {
  55             "16" => self.type_i16(),
  56             "32" => self.type_i32(),
  57             "64" => self.type_i64(),
  58             width => bug!("Unsupported c_int_width: {}", width),
  59         }
  60     }
  61
  62     fn type_from_integer(&self, i: Integer) -> Self::Type {
  63         use Integer::*;
  64         match i {
  65             I8 => self.type_i8(),
  66             I16 => self.type_i16(),
  67             I32 => self.type_i32(),
  68             I64 => self.type_i64(),
  69             I128 => self.type_i128(),
  70         }
  71     }
  72
  73     fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
  74         ty.needs_drop(self.tcx(), ty::ParamEnv::reveal_all())
  75     }
  76
  77     fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
  78         ty.is_sized(self.tcx().at(DUMMY_SP), ty::ParamEnv::reveal_all())
  79     }
  80
  81     fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
  82         ty.is_freeze(self.tcx().at(DUMMY_SP), ty::ParamEnv::reveal_all())
  83     }
  84
  85     fn type_has_metadata(&self, ty: Ty<'tcx>) -> bool {
  86         let param_env = ty::ParamEnv::reveal_all();
  87         if ty.is_sized(self.tcx().at(DUMMY_SP), param_env) {
  88             return false;
  89         }
  90
  91         let tail = self.tcx().struct_tail_erasing_lifetimes(ty, param_env);
  92         match tail.kind() {
  93             ty::Foreign(..) => false,
  94             ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
  95             _ => bug!("unexpected unsized tail: {:?}", tail),
  96         }
  97     }
  98 }
  99
 100 impl<'tcx, T> DerivedTypeMethods<'tcx> for T where Self: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {}
 101
 102 pub trait LayoutTypeMethods<'tcx>: Backend<'tcx> {
 103     fn backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type;
 104     fn cast_backend_type(&self, ty: &CastTarget) -> Self::Type;
 105     fn fn_decl_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> Self::Type;
 106     fn fn_ptr_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> Self::Type;
 107     fn reg_backend_type(&self, ty: &Reg) -> Self::Type;
 108     fn immediate_backend_type(&self, layout: TyAndLayout<'tcx>) -> Self::Type;
 109     fn is_backend_immediate(&self, layout: TyAndLayout<'tcx>) -> bool;
 110     fn is_backend_scalar_pair(&self, layout: TyAndLayout<'tcx>) -> bool;
 111     fn backend_field_index(&self, layout: TyAndLayout<'tcx>, index: usize) -> u64;
 112     fn scalar_pair_element_backend_type(
 113         &self,
 114         layout: TyAndLayout<'tcx>,
 115         index: usize,
 116         immediate: bool,
 117     ) -> Self::Type;
 118 }
 119
 120 // For backends that support CFI using type membership (i.e., testing whether a given  pointer is
 121 // associated with a type identifier).
 122 pub trait TypeMembershipMethods<'tcx>: Backend<'tcx> {
 123     fn set_type_metadata(&self, function: Self::Function, typeid: String);
 124     fn typeid_metadata(&self, typeid: String) -> Self::Value;
 125 }
 126
 127 pub trait ArgAbiMethods<'tcx>: HasCodegen<'tcx> {
 128     fn store_fn_arg(
 129         &mut self,
 130         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 131         idx: &mut usize,
 132         dst: PlaceRef<'tcx, Self::Value>,
 133     );
 134     fn store_arg(
 135         &mut self,
 136         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 137         val: Self::Value,
 138         dst: PlaceRef<'tcx, Self::Value>,
 139     );
 140     fn arg_memory_ty(&self, arg_abi: &ArgAbi<'tcx, Ty<'tcx>>) -> Self::Type;
 141 }
 142
 143 pub trait TypeMethods<'tcx>:
 144     DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> + TypeMembershipMethods<'tcx>
 145 {
 146 }
 147
 148 impl<'tcx, T> TypeMethods<'tcx> for T where
 149     Self: DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> + TypeMembershipMethods<'tcx>
 150 {
 151 }