mirror of
https://github.com/rust-lang/rust.git
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1025 lines
40 KiB
Rust
1025 lines
40 KiB
Rust
//! Definition of [`CValue`] and [`CPlace`]
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use cranelift_codegen::entity::EntityRef;
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use cranelift_codegen::ir::immediates::Offset32;
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use cranelift_frontend::Variable;
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use rustc_middle::ty::FnSig;
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use crate::prelude::*;
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fn codegen_field<'tcx>(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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base: Pointer,
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extra: Option<Value>,
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layout: TyAndLayout<'tcx>,
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field: FieldIdx,
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) -> (Pointer, TyAndLayout<'tcx>) {
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let field_offset = layout.fields.offset(field.index());
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let field_layout = layout.field(&*fx, field.index());
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let simple = |fx: &mut FunctionCx<'_, '_, '_>| {
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(base.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()), field_layout)
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};
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if field_layout.is_sized() {
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return simple(fx);
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}
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match field_layout.ty.kind() {
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ty::Slice(..) | ty::Str => simple(fx),
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_ => {
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let unaligned_offset = field_offset.bytes();
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// Get the alignment of the field
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let (_, mut unsized_align) = crate::unsize::size_and_align_of(fx, field_layout, extra);
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// For packed types, we need to cap alignment.
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if let ty::Adt(def, _) = layout.ty.kind() {
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if let Some(packed) = def.repr().pack {
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let packed = fx.bcx.ins().iconst(fx.pointer_type, packed.bytes() as i64);
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let cmp = fx.bcx.ins().icmp(IntCC::UnsignedLessThan, unsized_align, packed);
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unsized_align = fx.bcx.ins().select(cmp, unsized_align, packed);
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}
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}
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// Bump the unaligned offset up to the appropriate alignment
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let one = fx.bcx.ins().iconst(fx.pointer_type, 1);
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let align_sub_1 = fx.bcx.ins().isub(unsized_align, one);
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let and_lhs = fx.bcx.ins().iadd_imm(align_sub_1, unaligned_offset as i64);
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let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
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let and_rhs = fx.bcx.ins().isub(zero, unsized_align);
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let offset = fx.bcx.ins().band(and_lhs, and_rhs);
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(base.offset_value(fx, offset), field_layout)
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}
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}
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}
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fn scalar_pair_calculate_b_offset(tcx: TyCtxt<'_>, a_scalar: Scalar, b_scalar: Scalar) -> Offset32 {
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let b_offset = a_scalar.size(&tcx).align_to(b_scalar.align(&tcx).abi);
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Offset32::new(b_offset.bytes().try_into().unwrap())
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}
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/// A read-only value
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#[derive(Debug, Copy, Clone)]
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pub(crate) struct CValue<'tcx>(CValueInner, TyAndLayout<'tcx>);
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#[derive(Debug, Copy, Clone)]
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enum CValueInner {
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ByRef(Pointer, Option<Value>),
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ByVal(Value),
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ByValPair(Value, Value),
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}
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impl<'tcx> CValue<'tcx> {
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pub(crate) fn by_ref(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
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CValue(CValueInner::ByRef(ptr, None), layout)
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}
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pub(crate) fn by_ref_unsized(
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ptr: Pointer,
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meta: Value,
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layout: TyAndLayout<'tcx>,
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) -> CValue<'tcx> {
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CValue(CValueInner::ByRef(ptr, Some(meta)), layout)
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}
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pub(crate) fn by_val(value: Value, layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
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CValue(CValueInner::ByVal(value), layout)
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}
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pub(crate) fn by_val_pair(
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value: Value,
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extra: Value,
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layout: TyAndLayout<'tcx>,
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) -> CValue<'tcx> {
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CValue(CValueInner::ByValPair(value, extra), layout)
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}
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/// Create an instance of a ZST
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///
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/// The is represented by a dangling pointer of suitable alignment.
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pub(crate) fn zst(layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
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assert!(layout.is_zst());
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CValue::by_ref(crate::Pointer::dangling(layout.align.pref), layout)
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}
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pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
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self.1
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}
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// FIXME remove
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pub(crate) fn force_stack(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Pointer, Option<Value>) {
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let layout = self.1;
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match self.0 {
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CValueInner::ByRef(ptr, meta) => (ptr, meta),
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CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => {
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let cplace = CPlace::new_stack_slot(fx, layout);
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cplace.write_cvalue(fx, self);
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(cplace.to_ptr(), None)
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}
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}
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}
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// FIXME remove
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/// Forces the data value of a dyn* value to the stack and returns a pointer to it as well as the
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/// vtable pointer.
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pub(crate) fn dyn_star_force_data_on_stack(
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self,
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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) -> (Value, Value) {
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assert!(self.1.ty.is_dyn_star());
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match self.0 {
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CValueInner::ByRef(ptr, None) => {
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let (a_scalar, b_scalar) = match self.1.backend_repr {
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BackendRepr::ScalarPair(a, b) => (a, b),
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_ => unreachable!("dyn_star_force_data_on_stack({:?})", self),
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};
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let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
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let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar);
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let mut flags = MemFlags::new();
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flags.set_notrap();
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let vtable = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags);
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(ptr.get_addr(fx), vtable)
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}
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CValueInner::ByValPair(data, vtable) => {
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let data_ptr = fx.create_stack_slot(
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u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
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u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
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);
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data_ptr.store(fx, data, MemFlags::trusted());
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(data_ptr.get_addr(fx), vtable)
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}
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CValueInner::ByRef(_, Some(_)) | CValueInner::ByVal(_) => {
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unreachable!("dyn_star_force_data_on_stack({:?})", self)
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}
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}
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}
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pub(crate) fn try_to_ptr(self) -> Option<(Pointer, Option<Value>)> {
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match self.0 {
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CValueInner::ByRef(ptr, meta) => Some((ptr, meta)),
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CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => None,
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}
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}
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/// Load a value with layout.backend_repr of scalar
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#[track_caller]
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pub(crate) fn load_scalar(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> Value {
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let layout = self.1;
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match self.0 {
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CValueInner::ByRef(ptr, None) => {
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let clif_ty = match layout.backend_repr {
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BackendRepr::Scalar(scalar) => scalar_to_clif_type(fx.tcx, scalar),
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BackendRepr::Vector { element, count } => scalar_to_clif_type(fx.tcx, element)
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.by(u32::try_from(count).unwrap())
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.unwrap(),
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_ => unreachable!("{:?}", layout.ty),
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};
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let mut flags = MemFlags::new();
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flags.set_notrap();
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ptr.load(fx, clif_ty, flags)
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}
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CValueInner::ByVal(value) => value,
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CValueInner::ByRef(_, Some(_)) => bug!("load_scalar for unsized value not allowed"),
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CValueInner::ByValPair(_, _) => bug!("Please use load_scalar_pair for ByValPair"),
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}
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}
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/// Load a value pair with layout.backend_repr of scalar pair
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#[track_caller]
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pub(crate) fn load_scalar_pair(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Value, Value) {
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let layout = self.1;
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match self.0 {
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CValueInner::ByRef(ptr, None) => {
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let (a_scalar, b_scalar) = match layout.backend_repr {
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BackendRepr::ScalarPair(a, b) => (a, b),
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_ => unreachable!("load_scalar_pair({:?})", self),
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};
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let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
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let clif_ty1 = scalar_to_clif_type(fx.tcx, a_scalar);
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let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar);
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let mut flags = MemFlags::new();
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flags.set_notrap();
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let val1 = ptr.load(fx, clif_ty1, flags);
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let val2 = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags);
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(val1, val2)
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}
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CValueInner::ByRef(_, Some(_)) => {
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bug!("load_scalar_pair for unsized value not allowed")
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}
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CValueInner::ByVal(_) => bug!("Please use load_scalar for ByVal"),
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CValueInner::ByValPair(val1, val2) => (val1, val2),
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}
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}
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pub(crate) fn value_field(
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self,
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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field: FieldIdx,
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) -> CValue<'tcx> {
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let layout = self.1;
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match self.0 {
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CValueInner::ByVal(_) => unreachable!(),
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CValueInner::ByValPair(val1, val2) => match layout.backend_repr {
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BackendRepr::ScalarPair(_, _) => {
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let val = match field.as_u32() {
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0 => val1,
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1 => val2,
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_ => bug!("field should be 0 or 1"),
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};
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let field_layout = layout.field(&*fx, usize::from(field));
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CValue::by_val(val, field_layout)
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}
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_ => unreachable!("value_field for ByValPair with abi {:?}", layout.backend_repr),
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},
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CValueInner::ByRef(ptr, None) => {
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let (field_ptr, field_layout) = codegen_field(fx, ptr, None, layout, field);
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CValue::by_ref(field_ptr, field_layout)
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}
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CValueInner::ByRef(_, Some(_)) => todo!(),
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}
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}
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/// Like [`CValue::value_field`] except handling ADTs containing a single array field in a way
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/// such that you can access individual lanes.
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pub(crate) fn value_lane(
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self,
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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lane_idx: u64,
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) -> CValue<'tcx> {
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let layout = self.1;
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assert!(layout.ty.is_simd());
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let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
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let lane_layout = fx.layout_of(lane_ty);
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assert!(lane_idx < lane_count);
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match self.0 {
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CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(),
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CValueInner::ByRef(ptr, None) => {
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let field_offset = lane_layout.size * lane_idx;
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let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
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CValue::by_ref(field_ptr, lane_layout)
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}
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CValueInner::ByRef(_, Some(_)) => unreachable!(),
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}
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}
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/// Like [`CValue::value_field`] except using the passed type as lane type instead of the one
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/// specified by the vector type.
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pub(crate) fn value_typed_lane(
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self,
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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lane_ty: Ty<'tcx>,
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lane_idx: u64,
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) -> CValue<'tcx> {
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let layout = self.1;
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assert!(layout.ty.is_simd());
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let (orig_lane_count, orig_lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
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let lane_layout = fx.layout_of(lane_ty);
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assert!(
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(lane_idx + 1) * lane_layout.size <= orig_lane_count * fx.layout_of(orig_lane_ty).size
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);
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match self.0 {
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CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(),
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CValueInner::ByRef(ptr, None) => {
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let field_offset = lane_layout.size * lane_idx;
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let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
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CValue::by_ref(field_ptr, lane_layout)
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}
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CValueInner::ByRef(_, Some(_)) => unreachable!(),
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}
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}
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/// Like [`CValue::value_lane`] except allowing a dynamically calculated lane index.
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pub(crate) fn value_lane_dyn(
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self,
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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lane_idx: Value,
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) -> CValue<'tcx> {
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let layout = self.1;
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assert!(layout.ty.is_simd());
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let (_lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
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let lane_layout = fx.layout_of(lane_ty);
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match self.0 {
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CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(),
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CValueInner::ByRef(ptr, None) => {
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let field_offset = fx.bcx.ins().imul_imm(lane_idx, lane_layout.size.bytes() as i64);
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let field_ptr = ptr.offset_value(fx, field_offset);
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CValue::by_ref(field_ptr, lane_layout)
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}
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CValueInner::ByRef(_, Some(_)) => unreachable!(),
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}
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}
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/// If `ty` is signed, `const_val` must already be sign extended.
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pub(crate) fn const_val(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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layout: TyAndLayout<'tcx>,
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const_val: ty::ScalarInt,
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) -> CValue<'tcx> {
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assert_eq!(const_val.size(), layout.size, "{:#?}: {:?}", const_val, layout);
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use cranelift_codegen::ir::immediates::{Ieee32, Ieee64};
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let clif_ty = fx.clif_type(layout.ty).unwrap();
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let val = match layout.ty.kind() {
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ty::Uint(UintTy::U128) | ty::Int(IntTy::I128) => {
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let const_val = const_val.to_bits(layout.size);
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let lsb = fx.bcx.ins().iconst(types::I64, const_val as u64 as i64);
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let msb = fx.bcx.ins().iconst(types::I64, (const_val >> 64) as u64 as i64);
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fx.bcx.ins().iconcat(lsb, msb)
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}
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ty::Bool
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| ty::Char
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| ty::Uint(_)
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| ty::Int(_)
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| ty::Ref(..)
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| ty::RawPtr(..)
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| ty::FnPtr(..) => {
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let raw_val = const_val.size().truncate(const_val.to_bits(layout.size));
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fx.bcx.ins().iconst(clif_ty, raw_val as i64)
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}
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ty::Float(FloatTy::F32) => {
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fx.bcx.ins().f32const(Ieee32::with_bits(u32::try_from(const_val).unwrap()))
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}
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ty::Float(FloatTy::F64) => {
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fx.bcx.ins().f64const(Ieee64::with_bits(u64::try_from(const_val).unwrap()))
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}
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_ => panic!(
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"CValue::const_val for non bool/char/float/integer/pointer type {:?} is not allowed",
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layout.ty
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),
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};
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CValue::by_val(val, layout)
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}
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pub(crate) fn cast_pointer_to(self, layout: TyAndLayout<'tcx>) -> Self {
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assert!(matches!(self.layout().ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)));
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assert!(matches!(layout.ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)));
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assert_eq!(self.layout().backend_repr, layout.backend_repr);
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CValue(self.0, layout)
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}
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}
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/// A place where you can write a value to or read a value from
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#[derive(Debug, Copy, Clone)]
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pub(crate) struct CPlace<'tcx> {
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inner: CPlaceInner,
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layout: TyAndLayout<'tcx>,
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}
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#[derive(Debug, Copy, Clone)]
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enum CPlaceInner {
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Var(Local, Variable),
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VarPair(Local, Variable, Variable),
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Addr(Pointer, Option<Value>),
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}
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impl<'tcx> CPlace<'tcx> {
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pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
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self.layout
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}
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pub(crate) fn new_stack_slot(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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layout: TyAndLayout<'tcx>,
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) -> CPlace<'tcx> {
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assert!(layout.is_sized());
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if layout.size.bytes() == 0 {
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return CPlace {
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inner: CPlaceInner::Addr(Pointer::dangling(layout.align.pref), None),
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layout,
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};
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}
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if layout.size.bytes() >= u64::from(u32::MAX - 16) {
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fx.tcx
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.dcx()
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.fatal(format!("values of type {} are too big to store on the stack", layout.ty));
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}
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let stack_slot = fx.create_stack_slot(
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u32::try_from(layout.size.bytes()).unwrap(),
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u32::try_from(layout.align.pref.bytes()).unwrap(),
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);
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CPlace { inner: CPlaceInner::Addr(stack_slot, None), layout }
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}
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pub(crate) fn new_var(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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local: Local,
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layout: TyAndLayout<'tcx>,
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) -> CPlace<'tcx> {
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let var = Variable::from_u32(fx.next_ssa_var);
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fx.next_ssa_var += 1;
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fx.bcx.declare_var(var, fx.clif_type(layout.ty).unwrap());
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CPlace { inner: CPlaceInner::Var(local, var), layout }
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}
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pub(crate) fn new_var_pair(
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fx: &mut FunctionCx<'_, '_, 'tcx>,
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local: Local,
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layout: TyAndLayout<'tcx>,
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) -> CPlace<'tcx> {
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let var1 = Variable::from_u32(fx.next_ssa_var);
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fx.next_ssa_var += 1;
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let var2 = Variable::from_u32(fx.next_ssa_var);
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fx.next_ssa_var += 1;
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|
|
let (ty1, ty2) = fx.clif_pair_type(layout.ty).unwrap();
|
|
fx.bcx.declare_var(var1, ty1);
|
|
fx.bcx.declare_var(var2, ty2);
|
|
CPlace { inner: CPlaceInner::VarPair(local, var1, var2), layout }
|
|
}
|
|
|
|
pub(crate) fn for_ptr(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
|
|
CPlace { inner: CPlaceInner::Addr(ptr, None), layout }
|
|
}
|
|
|
|
pub(crate) fn for_ptr_with_extra(
|
|
ptr: Pointer,
|
|
extra: Value,
|
|
layout: TyAndLayout<'tcx>,
|
|
) -> CPlace<'tcx> {
|
|
CPlace { inner: CPlaceInner::Addr(ptr, Some(extra)), layout }
|
|
}
|
|
|
|
pub(crate) fn to_cvalue(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> CValue<'tcx> {
|
|
let layout = self.layout();
|
|
match self.inner {
|
|
CPlaceInner::Var(_local, var) => {
|
|
let val = fx.bcx.use_var(var);
|
|
//fx.bcx.set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
|
|
CValue::by_val(val, layout)
|
|
}
|
|
CPlaceInner::VarPair(_local, var1, var2) => {
|
|
let val1 = fx.bcx.use_var(var1);
|
|
//fx.bcx.set_val_label(val1, cranelift_codegen::ir::ValueLabel::new(var1.index()));
|
|
let val2 = fx.bcx.use_var(var2);
|
|
//fx.bcx.set_val_label(val2, cranelift_codegen::ir::ValueLabel::new(var2.index()));
|
|
CValue::by_val_pair(val1, val2, layout)
|
|
}
|
|
CPlaceInner::Addr(ptr, extra) => {
|
|
if let Some(extra) = extra {
|
|
CValue::by_ref_unsized(ptr, extra, layout)
|
|
} else {
|
|
CValue::by_ref(ptr, layout)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub(crate) fn debug_comment(self) -> (&'static str, String) {
|
|
match self.inner {
|
|
CPlaceInner::Var(_local, var) => ("ssa", format!("var={}", var.index())),
|
|
CPlaceInner::VarPair(_local, var1, var2) => {
|
|
("ssa", format!("var=({}, {})", var1.index(), var2.index()))
|
|
}
|
|
CPlaceInner::Addr(ptr, meta) => {
|
|
let meta =
|
|
if let Some(meta) = meta { format!(",meta={}", meta) } else { String::new() };
|
|
match ptr.debug_base_and_offset() {
|
|
(crate::pointer::PointerBase::Addr(addr), offset) => {
|
|
("reuse", format!("storage={}{}{}", addr, offset, meta))
|
|
}
|
|
(crate::pointer::PointerBase::Stack(stack_slot), offset) => {
|
|
("stack", format!("storage={}{}{}", stack_slot, offset, meta))
|
|
}
|
|
(crate::pointer::PointerBase::Dangling(align), offset) => {
|
|
("zst", format!("align={},offset={}", align.bytes(), offset))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[track_caller]
|
|
pub(crate) fn to_ptr(self) -> Pointer {
|
|
match self.inner {
|
|
CPlaceInner::Addr(ptr, None) => ptr,
|
|
CPlaceInner::Addr(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
|
|
CPlaceInner::Var(_, _) | CPlaceInner::VarPair(_, _, _) => {
|
|
bug!("Expected CPlace::Addr, found {:?}", self)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[track_caller]
|
|
pub(crate) fn to_ptr_unsized(self) -> (Pointer, Value) {
|
|
match self.inner {
|
|
CPlaceInner::Addr(ptr, Some(extra)) => (ptr, extra),
|
|
CPlaceInner::Addr(_, None) | CPlaceInner::Var(_, _) | CPlaceInner::VarPair(_, _, _) => {
|
|
bug!("Expected unsized cplace, found {:?}", self)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub(crate) fn try_to_ptr(self) -> Option<Pointer> {
|
|
match self.inner {
|
|
CPlaceInner::Var(_, _) | CPlaceInner::VarPair(_, _, _) => None,
|
|
CPlaceInner::Addr(ptr, None) => Some(ptr),
|
|
CPlaceInner::Addr(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn write_cvalue(self, fx: &mut FunctionCx<'_, '_, 'tcx>, from: CValue<'tcx>) {
|
|
assert_assignable(fx, from.layout().ty, self.layout().ty, 16);
|
|
|
|
self.write_cvalue_maybe_transmute(fx, from, "write_cvalue");
|
|
}
|
|
|
|
pub(crate) fn write_cvalue_transmute(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
from: CValue<'tcx>,
|
|
) {
|
|
self.write_cvalue_maybe_transmute(fx, from, "write_cvalue_transmute");
|
|
}
|
|
|
|
fn write_cvalue_maybe_transmute(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
from: CValue<'tcx>,
|
|
method: &'static str,
|
|
) {
|
|
fn transmute_scalar<'tcx>(
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
var: Variable,
|
|
data: Value,
|
|
dst_ty: Type,
|
|
) {
|
|
let src_ty = fx.bcx.func.dfg.value_type(data);
|
|
assert_eq!(
|
|
src_ty.bytes(),
|
|
dst_ty.bytes(),
|
|
"write_cvalue_transmute: {:?} -> {:?}",
|
|
src_ty,
|
|
dst_ty,
|
|
);
|
|
let data = match (src_ty, dst_ty) {
|
|
(_, _) if src_ty == dst_ty => data,
|
|
|
|
// This is a `write_cvalue_transmute`.
|
|
(types::I32, types::F32)
|
|
| (types::F32, types::I32)
|
|
| (types::I64, types::F64)
|
|
| (types::F64, types::I64) => codegen_bitcast(fx, dst_ty, data),
|
|
_ if src_ty.is_vector() && dst_ty.is_vector() => codegen_bitcast(fx, dst_ty, data),
|
|
_ if src_ty.is_vector() || dst_ty.is_vector() => {
|
|
// FIXME(bytecodealliance/wasmtime#6104) do something more efficient for transmutes between vectors and integers.
|
|
let ptr = fx.create_stack_slot(src_ty.bytes(), src_ty.bytes());
|
|
ptr.store(fx, data, MemFlags::trusted());
|
|
ptr.load(fx, dst_ty, MemFlags::trusted())
|
|
}
|
|
|
|
// `CValue`s should never contain SSA-only types, so if you ended
|
|
// up here having seen an error like `B1 -> I8`, then before
|
|
// calling `write_cvalue` you need to add a `bint` instruction.
|
|
_ => unreachable!("write_cvalue_transmute: {:?} -> {:?}", src_ty, dst_ty),
|
|
};
|
|
//fx.bcx.set_val_label(data, cranelift_codegen::ir::ValueLabel::new(var.index()));
|
|
fx.bcx.def_var(var, data);
|
|
}
|
|
|
|
assert_eq!(self.layout().size, from.layout().size);
|
|
|
|
if fx.clif_comments.enabled() {
|
|
use cranelift_codegen::cursor::{Cursor, CursorPosition};
|
|
let cur_block = match fx.bcx.cursor().position() {
|
|
CursorPosition::After(block) => block,
|
|
_ => unreachable!(),
|
|
};
|
|
fx.add_comment(
|
|
fx.bcx.func.layout.last_inst(cur_block).unwrap(),
|
|
format!(
|
|
"{}: {:?}: {:?} <- {:?}: {:?}",
|
|
method,
|
|
self.inner,
|
|
self.layout().ty,
|
|
from.0,
|
|
from.layout().ty
|
|
),
|
|
);
|
|
}
|
|
|
|
let dst_layout = self.layout();
|
|
match self.inner {
|
|
CPlaceInner::Var(_local, var) => {
|
|
let data = match from.1.backend_repr {
|
|
BackendRepr::Scalar(_) => CValue(from.0, dst_layout).load_scalar(fx),
|
|
_ => {
|
|
let (ptr, meta) = from.force_stack(fx);
|
|
assert!(meta.is_none());
|
|
CValue(CValueInner::ByRef(ptr, None), dst_layout).load_scalar(fx)
|
|
}
|
|
};
|
|
let dst_ty = fx.clif_type(self.layout().ty).unwrap();
|
|
transmute_scalar(fx, var, data, dst_ty);
|
|
}
|
|
CPlaceInner::VarPair(_local, var1, var2) => {
|
|
let (data1, data2) = match from.1.backend_repr {
|
|
BackendRepr::ScalarPair(_, _) => {
|
|
CValue(from.0, dst_layout).load_scalar_pair(fx)
|
|
}
|
|
_ => {
|
|
let (ptr, meta) = from.force_stack(fx);
|
|
assert!(meta.is_none());
|
|
CValue(CValueInner::ByRef(ptr, None), dst_layout).load_scalar_pair(fx)
|
|
}
|
|
};
|
|
let (dst_ty1, dst_ty2) = fx.clif_pair_type(self.layout().ty).unwrap();
|
|
transmute_scalar(fx, var1, data1, dst_ty1);
|
|
transmute_scalar(fx, var2, data2, dst_ty2);
|
|
}
|
|
CPlaceInner::Addr(_, Some(_)) => bug!("Can't write value to unsized place {:?}", self),
|
|
CPlaceInner::Addr(to_ptr, None) => {
|
|
if dst_layout.size == Size::ZERO
|
|
|| dst_layout.backend_repr == BackendRepr::Uninhabited
|
|
{
|
|
return;
|
|
}
|
|
|
|
let mut flags = MemFlags::new();
|
|
flags.set_notrap();
|
|
|
|
match from.0 {
|
|
CValueInner::ByVal(val) => {
|
|
to_ptr.store(fx, val, flags);
|
|
}
|
|
CValueInner::ByValPair(val1, val2) => match from.layout().backend_repr {
|
|
BackendRepr::ScalarPair(a_scalar, b_scalar) => {
|
|
let b_offset =
|
|
scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
|
|
to_ptr.store(fx, val1, flags);
|
|
to_ptr.offset(fx, b_offset).store(fx, val2, flags);
|
|
}
|
|
_ => {
|
|
bug!(
|
|
"Non ScalarPair repr {:?} for ByValPair CValue",
|
|
dst_layout.backend_repr
|
|
)
|
|
}
|
|
},
|
|
CValueInner::ByRef(from_ptr, None) => {
|
|
match from.layout().backend_repr {
|
|
BackendRepr::Scalar(_) => {
|
|
let val = from.load_scalar(fx);
|
|
to_ptr.store(fx, val, flags);
|
|
return;
|
|
}
|
|
BackendRepr::ScalarPair(a_scalar, b_scalar) => {
|
|
let b_offset =
|
|
scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
|
|
let (val1, val2) = from.load_scalar_pair(fx);
|
|
to_ptr.store(fx, val1, flags);
|
|
to_ptr.offset(fx, b_offset).store(fx, val2, flags);
|
|
return;
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
let from_addr = from_ptr.get_addr(fx);
|
|
let to_addr = to_ptr.get_addr(fx);
|
|
let src_layout = from.1;
|
|
let size = dst_layout.size.bytes();
|
|
// `emit_small_memory_copy` uses `u8` for alignments, just use the maximum
|
|
// alignment that fits in a `u8` if the actual alignment is larger.
|
|
let src_align = src_layout.align.abi.bytes().try_into().unwrap_or(128);
|
|
let dst_align = dst_layout.align.abi.bytes().try_into().unwrap_or(128);
|
|
fx.bcx.emit_small_memory_copy(
|
|
fx.target_config,
|
|
to_addr,
|
|
from_addr,
|
|
size,
|
|
dst_align,
|
|
src_align,
|
|
true,
|
|
flags,
|
|
);
|
|
}
|
|
CValueInner::ByRef(_, Some(_)) => todo!(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Used for `ProjectionElem::Subtype`, `ty` has to be monomorphized before
|
|
/// passed on.
|
|
pub(crate) fn place_transmute_type(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
ty: Ty<'tcx>,
|
|
) -> CPlace<'tcx> {
|
|
CPlace { inner: self.inner, layout: fx.layout_of(ty) }
|
|
}
|
|
|
|
pub(crate) fn place_field(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
field: FieldIdx,
|
|
) -> CPlace<'tcx> {
|
|
let layout = self.layout();
|
|
|
|
match self.inner {
|
|
CPlaceInner::VarPair(local, var1, var2) => {
|
|
let layout = layout.field(&*fx, field.index());
|
|
|
|
match field.as_u32() {
|
|
0 => return CPlace { inner: CPlaceInner::Var(local, var1), layout },
|
|
1 => return CPlace { inner: CPlaceInner::Var(local, var2), layout },
|
|
_ => unreachable!("field should be 0 or 1"),
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
let (base, extra) = match self.inner {
|
|
CPlaceInner::Addr(ptr, extra) => (ptr, extra),
|
|
CPlaceInner::Var(_, _) | CPlaceInner::VarPair(_, _, _) => {
|
|
bug!("Expected CPlace::Addr, found {:?}", self)
|
|
}
|
|
};
|
|
|
|
let (field_ptr, field_layout) = codegen_field(fx, base, extra, layout, field);
|
|
if has_ptr_meta(fx.tcx, field_layout.ty) {
|
|
CPlace::for_ptr_with_extra(field_ptr, extra.unwrap(), field_layout)
|
|
} else {
|
|
CPlace::for_ptr(field_ptr, field_layout)
|
|
}
|
|
}
|
|
|
|
/// Like [`CPlace::place_field`] except handling ADTs containing a single array field in a way
|
|
/// such that you can access individual lanes.
|
|
pub(crate) fn place_lane(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
lane_idx: u64,
|
|
) -> CPlace<'tcx> {
|
|
let layout = self.layout();
|
|
assert!(layout.ty.is_simd());
|
|
let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
|
|
let lane_layout = fx.layout_of(lane_ty);
|
|
assert!(lane_idx < lane_count);
|
|
|
|
match self.inner {
|
|
CPlaceInner::Var(_, _) => unreachable!(),
|
|
CPlaceInner::VarPair(_, _, _) => unreachable!(),
|
|
CPlaceInner::Addr(ptr, None) => {
|
|
let field_offset = lane_layout.size * lane_idx;
|
|
let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
|
|
CPlace::for_ptr(field_ptr, lane_layout)
|
|
}
|
|
CPlaceInner::Addr(_, Some(_)) => unreachable!(),
|
|
}
|
|
}
|
|
|
|
/// Like [`CPlace::place_field`] except using the passed type as lane type instead of the one
|
|
/// specified by the vector type.
|
|
pub(crate) fn place_typed_lane(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
lane_ty: Ty<'tcx>,
|
|
lane_idx: u64,
|
|
) -> CPlace<'tcx> {
|
|
let layout = self.layout();
|
|
assert!(layout.ty.is_simd());
|
|
let (orig_lane_count, orig_lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
|
|
let lane_layout = fx.layout_of(lane_ty);
|
|
assert!(
|
|
(lane_idx + 1) * lane_layout.size <= orig_lane_count * fx.layout_of(orig_lane_ty).size
|
|
);
|
|
|
|
match self.inner {
|
|
CPlaceInner::Var(_, _) => unreachable!(),
|
|
CPlaceInner::VarPair(_, _, _) => unreachable!(),
|
|
CPlaceInner::Addr(ptr, None) => {
|
|
let field_offset = lane_layout.size * lane_idx;
|
|
let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
|
|
CPlace::for_ptr(field_ptr, lane_layout)
|
|
}
|
|
CPlaceInner::Addr(_, Some(_)) => unreachable!(),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn place_index(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
index: Value,
|
|
) -> CPlace<'tcx> {
|
|
let (elem_layout, ptr) = match self.layout().ty.kind() {
|
|
ty::Array(elem_ty, _) => {
|
|
let elem_layout = fx.layout_of(*elem_ty);
|
|
match self.inner {
|
|
CPlaceInner::Addr(addr, None) => (elem_layout, addr),
|
|
CPlaceInner::Var(_, _)
|
|
| CPlaceInner::Addr(_, Some(_))
|
|
| CPlaceInner::VarPair(_, _, _) => bug!("Can't index into {self:?}"),
|
|
}
|
|
}
|
|
ty::Slice(elem_ty) => (fx.layout_of(*elem_ty), self.to_ptr_unsized().0),
|
|
_ => bug!("place_index({:?})", self.layout().ty),
|
|
};
|
|
|
|
let offset = fx.bcx.ins().imul_imm(index, elem_layout.size.bytes() as i64);
|
|
|
|
CPlace::for_ptr(ptr.offset_value(fx, offset), elem_layout)
|
|
}
|
|
|
|
pub(crate) fn place_deref(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> CPlace<'tcx> {
|
|
let inner_layout = fx.layout_of(self.layout().ty.builtin_deref(true).unwrap());
|
|
if has_ptr_meta(fx.tcx, inner_layout.ty) {
|
|
let (addr, extra) = self.to_cvalue(fx).load_scalar_pair(fx);
|
|
CPlace::for_ptr_with_extra(Pointer::new(addr), extra, inner_layout)
|
|
} else {
|
|
CPlace::for_ptr(Pointer::new(self.to_cvalue(fx).load_scalar(fx)), inner_layout)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn place_ref(
|
|
self,
|
|
fx: &mut FunctionCx<'_, '_, 'tcx>,
|
|
layout: TyAndLayout<'tcx>,
|
|
) -> CValue<'tcx> {
|
|
if has_ptr_meta(fx.tcx, self.layout().ty) {
|
|
let (ptr, extra) = self.to_ptr_unsized();
|
|
CValue::by_val_pair(ptr.get_addr(fx), extra, layout)
|
|
} else {
|
|
CValue::by_val(self.to_ptr().get_addr(fx), layout)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn downcast_variant(
|
|
self,
|
|
fx: &FunctionCx<'_, '_, 'tcx>,
|
|
variant: VariantIdx,
|
|
) -> Self {
|
|
assert!(self.layout().is_sized());
|
|
let layout = self.layout().for_variant(fx, variant);
|
|
CPlace { inner: self.inner, layout }
|
|
}
|
|
}
|
|
|
|
#[track_caller]
|
|
pub(crate) fn assert_assignable<'tcx>(
|
|
fx: &FunctionCx<'_, '_, 'tcx>,
|
|
from_ty: Ty<'tcx>,
|
|
to_ty: Ty<'tcx>,
|
|
limit: usize,
|
|
) {
|
|
if limit == 0 {
|
|
// assert_assignable exists solely to catch bugs in cg_clif. it isn't necessary for
|
|
// soundness. don't attempt to check deep types to avoid exponential behavior in certain
|
|
// cases.
|
|
return;
|
|
}
|
|
match (from_ty.kind(), to_ty.kind()) {
|
|
(ty::Ref(_, a, _), ty::Ref(_, b, _)) | (ty::RawPtr(a, _), ty::RawPtr(b, _)) => {
|
|
assert_assignable(fx, *a, *b, limit - 1);
|
|
}
|
|
(ty::Ref(_, a, _), ty::RawPtr(b, _)) | (ty::RawPtr(a, _), ty::Ref(_, b, _)) => {
|
|
assert_assignable(fx, *a, *b, limit - 1);
|
|
}
|
|
(ty::FnPtr(..), ty::FnPtr(..)) => {
|
|
let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
|
|
ParamEnv::reveal_all(),
|
|
from_ty.fn_sig(fx.tcx),
|
|
);
|
|
let FnSig {
|
|
inputs_and_output: types_from,
|
|
c_variadic: c_variadic_from,
|
|
safety: unsafety_from,
|
|
abi: abi_from,
|
|
} = from_sig;
|
|
let to_sig = fx
|
|
.tcx
|
|
.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to_ty.fn_sig(fx.tcx));
|
|
let FnSig {
|
|
inputs_and_output: types_to,
|
|
c_variadic: c_variadic_to,
|
|
safety: unsafety_to,
|
|
abi: abi_to,
|
|
} = to_sig;
|
|
let mut types_from = types_from.iter();
|
|
let mut types_to = types_to.iter();
|
|
loop {
|
|
match (types_from.next(), types_to.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => break,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
assert_eq!(
|
|
c_variadic_from, c_variadic_to,
|
|
"Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
|
|
from_sig, to_sig, fx,
|
|
);
|
|
assert_eq!(
|
|
unsafety_from, unsafety_to,
|
|
"Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
|
|
from_sig, to_sig, fx,
|
|
);
|
|
assert_eq!(
|
|
abi_from, abi_to,
|
|
"Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
|
|
from_sig, to_sig, fx,
|
|
);
|
|
// fn(&T) -> for<'l> fn(&'l T) is allowed
|
|
}
|
|
(&ty::Dynamic(from_traits, _, _from_kind), &ty::Dynamic(to_traits, _, _to_kind)) => {
|
|
// FIXME(dyn-star): Do the right thing with DynKinds
|
|
for (from, to) in from_traits.iter().zip(to_traits) {
|
|
let from =
|
|
fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), from);
|
|
let to = fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to);
|
|
assert_eq!(
|
|
from, to,
|
|
"Can't write trait object of incompatible traits {:?} to place with traits {:?}\n\n{:#?}",
|
|
from_traits, to_traits, fx,
|
|
);
|
|
}
|
|
// dyn for<'r> Trait<'r> -> dyn Trait<'_> is allowed
|
|
}
|
|
(&ty::Tuple(types_a), &ty::Tuple(types_b)) => {
|
|
let mut types_a = types_a.iter();
|
|
let mut types_b = types_b.iter();
|
|
loop {
|
|
match (types_a.next(), types_b.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => return,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
}
|
|
(&ty::Adt(adt_def_a, args_a), &ty::Adt(adt_def_b, args_b))
|
|
if adt_def_a.did() == adt_def_b.did() =>
|
|
{
|
|
let mut types_a = args_a.types();
|
|
let mut types_b = args_b.types();
|
|
loop {
|
|
match (types_a.next(), types_b.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => return,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
}
|
|
(ty::Array(a, _), ty::Array(b, _)) => assert_assignable(fx, *a, *b, limit - 1),
|
|
(&ty::Closure(def_id_a, args_a), &ty::Closure(def_id_b, args_b))
|
|
if def_id_a == def_id_b =>
|
|
{
|
|
let mut types_a = args_a.types();
|
|
let mut types_b = args_b.types();
|
|
loop {
|
|
match (types_a.next(), types_b.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => return,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
}
|
|
(&ty::Coroutine(def_id_a, args_a), &ty::Coroutine(def_id_b, args_b))
|
|
if def_id_a == def_id_b =>
|
|
{
|
|
let mut types_a = args_a.types();
|
|
let mut types_b = args_b.types();
|
|
loop {
|
|
match (types_a.next(), types_b.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => return,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
}
|
|
(&ty::CoroutineWitness(def_id_a, args_a), &ty::CoroutineWitness(def_id_b, args_b))
|
|
if def_id_a == def_id_b =>
|
|
{
|
|
let mut types_a = args_a.types();
|
|
let mut types_b = args_b.types();
|
|
loop {
|
|
match (types_a.next(), types_b.next()) {
|
|
(Some(a), Some(b)) => assert_assignable(fx, a, b, limit - 1),
|
|
(None, None) => return,
|
|
(Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
|
|
}
|
|
}
|
|
}
|
|
(ty::Param(_), _) | (_, ty::Param(_)) if fx.tcx.sess.opts.unstable_opts.polymorphize => {
|
|
// No way to check if it is correct or not with polymorphization enabled
|
|
}
|
|
_ => {
|
|
assert_eq!(
|
|
from_ty,
|
|
to_ty,
|
|
"Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
|
|
from_ty.kind(),
|
|
to_ty.kind(),
|
|
fx,
|
|
);
|
|
}
|
|
}
|
|
}
|