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use super::misc::MiscMethods;
use super::Backend;
use super::HasCodegen;
use crate::common::TypeKind;
use crate::mir::place::PlaceRef;
use rustc_middle::ty::layout::TyAndLayout;
use rustc_middle::ty::{self, Ty};
use rustc_target::abi::call::{ArgAbi, CastTarget, FnAbi, Reg};
use rustc_target::abi::{AddressSpace, Integer};
// This depends on `Backend` and not `BackendTypes`, because consumers will probably want to use
// `LayoutOf` or `HasTyCtxt`. This way, they don't have to add a constraint on it themselves.
pub trait BaseTypeMethods<'tcx>: Backend<'tcx> {
fn type_i1(&self) -> Self::Type;
fn type_i8(&self) -> Self::Type;
fn type_i16(&self) -> Self::Type;
fn type_i32(&self) -> Self::Type;
fn type_i64(&self) -> Self::Type;
fn type_i128(&self) -> Self::Type;
fn type_isize(&self) -> Self::Type;
fn type_f32(&self) -> Self::Type;
fn type_f64(&self) -> Self::Type;
fn type_array(&self, ty: Self::Type, len: u64) -> Self::Type;
fn type_func(&self, args: &[Self::Type], ret: Self::Type) -> Self::Type;
fn type_struct(&self, els: &[Self::Type], packed: bool) -> Self::Type;
fn type_kind(&self, ty: Self::Type) -> TypeKind;
fn type_ptr_to(&self, ty: Self::Type) -> Self::Type;
fn type_ptr_to_ext(&self, ty: Self::Type, address_space: AddressSpace) -> Self::Type;
fn element_type(&self, ty: Self::Type) -> Self::Type;
/// Returns the number of elements in `self` if it is a LLVM vector type.
fn vector_length(&self, ty: Self::Type) -> usize;
fn float_width(&self, ty: Self::Type) -> usize;
/// Retrieves the bit width of the integer type `self`.
fn int_width(&self, ty: Self::Type) -> u64;
fn val_ty(&self, v: Self::Value) -> Self::Type;
}
pub trait DerivedTypeMethods<'tcx>: BaseTypeMethods<'tcx> + MiscMethods<'tcx> {
fn type_i8p(&self) -> Self::Type {
self.type_i8p_ext(AddressSpace::DATA)
}
fn type_i8p_ext(&self, address_space: AddressSpace) -> Self::Type {
self.type_ptr_to_ext(self.type_i8(), address_space)
}
fn type_int(&self) -> Self::Type {
match &self.sess().target.c_int_width[..] {
"16" => self.type_i16(),
"32" => self.type_i32(),
"64" => self.type_i64(),
width => bug!("Unsupported c_int_width: {}", width),
}
}
fn type_from_integer(&self, i: Integer) -> Self::Type {
use Integer::*;
match i {
I8 => self.type_i8(),
I16 => self.type_i16(),
I32 => self.type_i32(),
I64 => self.type_i64(),
I128 => self.type_i128(),
}
}
fn type_needs_drop(&self, ty: Ty<'tcx>) -> bool {
ty.needs_drop(self.tcx(), ty::ParamEnv::reveal_all())
}
fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
ty.is_sized(self.tcx(), ty::ParamEnv::reveal_all())
}
fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
ty.is_freeze(self.tcx(), ty::ParamEnv::reveal_all())
}
fn type_has_metadata(&self, ty: Ty<'tcx>) -> bool {
let param_env = ty::ParamEnv::reveal_all();
if ty.is_sized(self.tcx(), param_env) {
return false;
}
let tail = self.tcx().struct_tail_erasing_lifetimes(ty, param_env);
match tail.kind() {
ty::Foreign(..) => false,
ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
_ => bug!("unexpected unsized tail: {:?}", tail),
}
}
}
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;
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;
}
// For backends that support CFI using type membership (i.e., testing whether a given pointer is
// associated with a type identifier).
pub trait TypeMembershipMethods<'tcx>: Backend<'tcx> {
fn set_type_metadata(&self, function: Self::Function, typeid: String);
fn typeid_metadata(&self, typeid: String) -> Self::Value;
fn set_kcfi_type_metadata(&self, function: Self::Function, typeid: u32);
}
pub trait ArgAbiMethods<'tcx>: HasCodegen<'tcx> {
fn store_fn_arg(
&mut self,
arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
idx: &mut usize,
dst: PlaceRef<'tcx, Self::Value>,
);
fn store_arg(
&mut self,
arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
val: Self::Value,
dst: PlaceRef<'tcx, Self::Value>,
);
fn arg_memory_ty(&self, arg_abi: &ArgAbi<'tcx, Ty<'tcx>>) -> Self::Type;
}
pub trait TypeMethods<'tcx>:
DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> + TypeMembershipMethods<'tcx>
{
}
impl<'tcx, T> TypeMethods<'tcx> for T where
Self: DerivedTypeMethods<'tcx> + LayoutTypeMethods<'tcx> + TypeMembershipMethods<'tcx>
{
}
|
