src/tools/clippy/clippy_lints/src/casts/utils.rs

   1 use rustc_middle::ty::{self, IntTy, Ty, TyCtxt, UintTy};
   2
   3 /// Returns the size in bits of an integral type.
   4 /// Will return 0 if the type is not an int or uint variant
   5 pub(super) fn int_ty_to_nbits(typ: Ty<'_>, tcx: TyCtxt<'_>) -> u64 {
   6     match typ.kind() {
   7         ty::Int(i) => match i {
   8             IntTy::Isize => tcx.data_layout.pointer_size.bits(),
   9             IntTy::I8 => 8,
  10             IntTy::I16 => 16,
  11             IntTy::I32 => 32,
  12             IntTy::I64 => 64,
  13             IntTy::I128 => 128,
  14         },
  15         ty::Uint(i) => match i {
  16             UintTy::Usize => tcx.data_layout.pointer_size.bits(),
  17             UintTy::U8 => 8,
  18             UintTy::U16 => 16,
  19             UintTy::U32 => 32,
  20             UintTy::U64 => 64,
  21             UintTy::U128 => 128,
  22         },
  23         _ => 0,
  24     }
  25 }