778 lines
27 KiB
Rust
778 lines
27 KiB
Rust
//! Definition of [`CValue`] and [`CPlace`]
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use crate::prelude::*;
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use cranelift_codegen::entity::EntityRef;
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use cranelift_codegen::ir::immediates::Offset32;
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fn codegen_field<'tcx>(
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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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: mir::Field,
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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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(
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base.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()),
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field_layout,
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)
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};
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if let Some(extra) = extra {
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if !field_layout.is_unsized() {
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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 | ty::Foreign(..) => return simple(fx),
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ty::Adt(def, _) if def.repr.packed() => {
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assert_eq!(layout.align.abi.bytes(), 1);
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return simple(fx);
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}
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_ => {
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// We have to align the offset for DST's
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let unaligned_offset = field_offset.bytes();
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let (_, unsized_align) =
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crate::unsize::size_and_align_of_dst(fx, field_layout, extra);
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let one = fx.bcx.ins().iconst(pointer_ty(fx.tcx), 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(pointer_ty(fx.tcx), 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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} else {
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simple(fx)
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}
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}
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fn scalar_pair_calculate_b_offset(
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tcx: TyCtxt<'_>,
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a_scalar: &Scalar,
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b_scalar: &Scalar,
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) -> Offset32 {
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let b_offset = a_scalar
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.value
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.size(&tcx)
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.align_to(b_scalar.value.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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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(
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self,
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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) -> (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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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.abi of scalar
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pub(crate) fn load_scalar(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> 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.abi {
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Abi::Scalar(ref scalar) => scalar_to_clif_type(fx.tcx, scalar.clone()),
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Abi::Vector { ref element, count } => {
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scalar_to_clif_type(fx.tcx, element.clone())
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.by(u16::try_from(count).unwrap())
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.unwrap()
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}
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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.abi of scalar pair
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pub(crate) fn load_scalar_pair(
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self,
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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) -> (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.abi {
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Abi::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.clone());
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let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar.clone());
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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, impl Backend>,
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field: mir::Field,
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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(val) => match layout.abi {
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Abi::Vector { element: _, count } => {
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let count = u8::try_from(count).expect("SIMD type with more than 255 lanes???");
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let field = u8::try_from(field.index()).unwrap();
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assert!(field < count);
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let lane = fx.bcx.ins().extractlane(val, field);
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let field_layout = layout.field(&*fx, usize::from(field));
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CValue::by_val(lane, field_layout)
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}
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_ => unreachable!("value_field for ByVal with abi {:?}", layout.abi),
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},
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CValueInner::ByValPair(val1, val2) => match layout.abi {
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Abi::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.abi),
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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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pub(crate) fn unsize_value(
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self,
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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dest: CPlace<'tcx>,
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) {
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crate::unsize::coerce_unsized_into(fx, self, dest);
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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, impl Backend>,
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layout: TyAndLayout<'tcx>,
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const_val: u128,
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) -> CValue<'tcx> {
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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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match layout.ty.kind() {
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ty::Bool => {
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assert!(
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const_val == 0 || const_val == 1,
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"Invalid bool 0x{:032X}",
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const_val
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);
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}
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_ => {}
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}
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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 lsb = fx.bcx.ins().iconst(types::I64, const_val as u64 as i64);
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let msb = fx
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.bcx
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.ins()
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.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 | ty::Char | ty::Uint(_) | ty::Int(_) | ty::Ref(..)
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| ty::RawPtr(..) => {
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fx
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.bcx
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.ins()
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.iconst(clif_ty, u64::try_from(const_val).expect("uint") 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!(
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self.layout().ty.kind(),
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ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)
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));
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assert!(matches!(
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layout.ty.kind(),
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ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)
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));
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assert_eq!(self.layout().abi, layout.abi);
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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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pub(crate) enum CPlaceInner {
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Var(Local, Variable),
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VarPair(Local, Variable, Variable),
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VarLane(Local, Variable, u8),
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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 inner(&self) -> &CPlaceInner {
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&self.inner
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}
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pub(crate) fn no_place(layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
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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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pub(crate) fn new_stack_slot(
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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layout: TyAndLayout<'tcx>,
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) -> CPlace<'tcx> {
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assert!(!layout.is_unsized());
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if layout.size.bytes() == 0 {
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return CPlace::no_place(layout);
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}
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let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
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kind: StackSlotKind::ExplicitSlot,
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size: layout.size.bytes() as u32,
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offset: None,
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});
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CPlace {
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inner: CPlaceInner::Addr(Pointer::stack_slot(stack_slot), None),
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layout,
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}
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}
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pub(crate) fn new_var(
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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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::with_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 {
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inner: CPlaceInner::Var(local, var),
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layout,
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}
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}
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pub(crate) fn new_var_pair(
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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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::with_u32(fx.next_ssa_var);
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fx.next_ssa_var += 1;
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let var2 = Variable::with_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();
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fx.bcx.declare_var(var1, ty1);
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fx.bcx.declare_var(var2, ty2);
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CPlace {
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inner: CPlaceInner::VarPair(local, var1, var2),
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layout,
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}
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}
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pub(crate) fn for_ptr(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
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CPlace {
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inner: CPlaceInner::Addr(ptr, None),
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layout,
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}
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}
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pub(crate) fn for_ptr_with_extra(
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ptr: Pointer,
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extra: Value,
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layout: TyAndLayout<'tcx>,
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) -> CPlace<'tcx> {
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CPlace {
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inner: CPlaceInner::Addr(ptr, Some(extra)),
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layout,
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}
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}
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pub(crate) fn to_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> CValue<'tcx> {
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let layout = self.layout();
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match self.inner {
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CPlaceInner::Var(_local, var) => {
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let val = fx.bcx.use_var(var);
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fx.bcx
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.set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
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CValue::by_val(val, layout)
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}
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CPlaceInner::VarPair(_local, var1, var2) => {
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let val1 = fx.bcx.use_var(var1);
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fx.bcx
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.set_val_label(val1, cranelift_codegen::ir::ValueLabel::new(var1.index()));
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let val2 = fx.bcx.use_var(var2);
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fx.bcx
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.set_val_label(val2, cranelift_codegen::ir::ValueLabel::new(var2.index()));
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CValue::by_val_pair(val1, val2, layout)
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}
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CPlaceInner::VarLane(_local, var, lane) => {
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let val = fx.bcx.use_var(var);
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fx.bcx
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.set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
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let val = fx.bcx.ins().extractlane(val, lane);
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CValue::by_val(val, layout)
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}
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CPlaceInner::Addr(ptr, extra) => {
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if let Some(extra) = extra {
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CValue::by_ref_unsized(ptr, extra, layout)
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} else {
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CValue::by_ref(ptr, layout)
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}
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}
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}
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}
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pub(crate) fn to_ptr(self) -> Pointer {
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match self.to_ptr_maybe_unsized() {
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(ptr, None) => ptr,
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(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
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}
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}
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pub(crate) fn to_ptr_maybe_unsized(self) -> (Pointer, Option<Value>) {
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match self.inner {
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CPlaceInner::Addr(ptr, extra) => (ptr, extra),
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CPlaceInner::Var(_, _)
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| CPlaceInner::VarPair(_, _, _)
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| CPlaceInner::VarLane(_, _, _) => bug!("Expected CPlace::Addr, found {:?}", self),
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}
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}
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pub(crate) fn write_cvalue(
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self,
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fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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from: CValue<'tcx>,
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) {
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fn assert_assignable<'tcx>(
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fx: &FunctionCx<'_, 'tcx, impl Backend>,
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from_ty: Ty<'tcx>,
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to_ty: Ty<'tcx>,
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) {
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match (&from_ty.kind(), &to_ty.kind()) {
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(ty::Ref(_, a, _), ty::Ref(_, b, _))
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| (
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ty::RawPtr(TypeAndMut { ty: a, mutbl: _ }),
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ty::RawPtr(TypeAndMut { ty: b, mutbl: _ }),
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) => {
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assert_assignable(fx, a, b);
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}
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(ty::FnPtr(_), ty::FnPtr(_)) => {
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let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
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ParamEnv::reveal_all(),
|
|
&from_ty.fn_sig(fx.tcx),
|
|
);
|
|
let to_sig = fx.tcx.normalize_erasing_late_bound_regions(
|
|
ParamEnv::reveal_all(),
|
|
&to_ty.fn_sig(fx.tcx),
|
|
);
|
|
assert_eq!(
|
|
from_sig, to_sig,
|
|
"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, _), ty::Dynamic(to_traits, _)) => {
|
|
let from_traits = fx
|
|
.tcx
|
|
.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), from_traits);
|
|
let to_traits = fx
|
|
.tcx
|
|
.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to_traits);
|
|
assert_eq!(
|
|
from_traits, to_traits,
|
|
"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
|
|
}
|
|
_ => {
|
|
assert_eq!(
|
|
from_ty,
|
|
to_ty,
|
|
"Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
|
|
from_ty,
|
|
to_ty,
|
|
fx,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
assert_assignable(fx, from.layout().ty, self.layout().ty);
|
|
|
|
self.write_cvalue_maybe_transmute(fx, from, "write_cvalue");
|
|
}
|
|
|
|
pub(crate) fn write_cvalue_transmute(
|
|
self,
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
from: CValue<'tcx>,
|
|
) {
|
|
self.write_cvalue_maybe_transmute(fx, from, "write_cvalue_transmute");
|
|
}
|
|
|
|
fn write_cvalue_maybe_transmute(
|
|
self,
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
from: CValue<'tcx>,
|
|
#[cfg_attr(not(debug_assertions), allow(unused_variables))] method: &'static str,
|
|
) {
|
|
fn transmute_value<'tcx>(
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
var: Variable,
|
|
data: Value,
|
|
dst_ty: Type,
|
|
) {
|
|
let src_ty = fx.bcx.func.dfg.value_type(data);
|
|
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) => fx.bcx.ins().bitcast(dst_ty, data),
|
|
_ if src_ty.is_vector() && dst_ty.is_vector() => {
|
|
fx.bcx.ins().raw_bitcast(dst_ty, data)
|
|
}
|
|
_ => 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);
|
|
|
|
#[cfg(debug_assertions)]
|
|
{
|
|
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();
|
|
let to_ptr = match self.inner {
|
|
CPlaceInner::Var(_local, var) => {
|
|
let data = CValue(from.0, dst_layout).load_scalar(fx);
|
|
let dst_ty = fx.clif_type(self.layout().ty).unwrap();
|
|
transmute_value(fx, var, data, dst_ty);
|
|
return;
|
|
}
|
|
CPlaceInner::VarPair(_local, var1, var2) => {
|
|
let (data1, data2) = CValue(from.0, dst_layout).load_scalar_pair(fx);
|
|
let (dst_ty1, dst_ty2) = fx.clif_pair_type(self.layout().ty).unwrap();
|
|
transmute_value(fx, var1, data1, dst_ty1);
|
|
transmute_value(fx, var2, data2, dst_ty2);
|
|
return;
|
|
}
|
|
CPlaceInner::VarLane(_local, var, lane) => {
|
|
let data = from.load_scalar(fx);
|
|
|
|
// First get the old vector
|
|
let vector = fx.bcx.use_var(var);
|
|
fx.bcx
|
|
.set_val_label(vector, cranelift_codegen::ir::ValueLabel::new(var.index()));
|
|
|
|
// Next insert the written lane into the vector
|
|
let vector = fx.bcx.ins().insertlane(vector, data, lane);
|
|
|
|
// Finally write the new vector
|
|
fx.bcx
|
|
.set_val_label(vector, cranelift_codegen::ir::ValueLabel::new(var.index()));
|
|
fx.bcx.def_var(var, vector);
|
|
|
|
return;
|
|
}
|
|
CPlaceInner::Addr(ptr, None) => {
|
|
if dst_layout.size == Size::ZERO || dst_layout.abi == Abi::Uninhabited {
|
|
return;
|
|
}
|
|
ptr
|
|
}
|
|
CPlaceInner::Addr(_, Some(_)) => bug!("Can't write value to unsized place {:?}", self),
|
|
};
|
|
|
|
let mut flags = MemFlags::new();
|
|
flags.set_notrap();
|
|
match from.layout().abi {
|
|
// FIXME make Abi::Vector work too
|
|
Abi::Scalar(_) => {
|
|
let val = from.load_scalar(fx);
|
|
to_ptr.store(fx, val, flags);
|
|
return;
|
|
}
|
|
Abi::ScalarPair(ref a_scalar, ref b_scalar) => {
|
|
let (value, extra) = from.load_scalar_pair(fx);
|
|
let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
|
|
to_ptr.store(fx, value, flags);
|
|
to_ptr.offset(fx, b_offset).store(fx, extra, flags);
|
|
return;
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
match from.0 {
|
|
CValueInner::ByVal(val) => {
|
|
to_ptr.store(fx, val, flags);
|
|
}
|
|
CValueInner::ByValPair(_, _) => {
|
|
bug!(
|
|
"Non ScalarPair abi {:?} for ByValPair CValue",
|
|
dst_layout.abi
|
|
);
|
|
}
|
|
CValueInner::ByRef(from_ptr, None) => {
|
|
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();
|
|
let src_align = src_layout.align.abi.bytes() as u8;
|
|
let dst_align = dst_layout.align.abi.bytes() as u8;
|
|
fx.bcx.emit_small_memory_copy(
|
|
fx.cx.module.target_config(),
|
|
to_addr,
|
|
from_addr,
|
|
size,
|
|
dst_align,
|
|
src_align,
|
|
true,
|
|
);
|
|
}
|
|
CValueInner::ByRef(_, Some(_)) => todo!(),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn place_field(
|
|
self,
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
field: mir::Field,
|
|
) -> CPlace<'tcx> {
|
|
let layout = self.layout();
|
|
|
|
match self.inner {
|
|
CPlaceInner::Var(local, var) => {
|
|
if let Abi::Vector { .. } = layout.abi {
|
|
return CPlace {
|
|
inner: CPlaceInner::VarLane(local, var, field.as_u32().try_into().unwrap()),
|
|
layout: layout.field(fx, field.as_u32().try_into().unwrap()),
|
|
};
|
|
}
|
|
}
|
|
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) = self.to_ptr_maybe_unsized();
|
|
|
|
let (field_ptr, field_layout) = codegen_field(fx, base, extra, layout, field);
|
|
if field_layout.is_unsized() {
|
|
CPlace::for_ptr_with_extra(field_ptr, extra.unwrap(), field_layout)
|
|
} else {
|
|
CPlace::for_ptr(field_ptr, field_layout)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn place_index(
|
|
self,
|
|
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
|
|
index: Value,
|
|
) -> CPlace<'tcx> {
|
|
let (elem_layout, ptr) = match self.layout().ty.kind() {
|
|
ty::Array(elem_ty, _) => (fx.layout_of(elem_ty), self.to_ptr()),
|
|
ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_ptr_maybe_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, impl Backend>) -> CPlace<'tcx> {
|
|
let inner_layout = fx.layout_of(self.layout().ty.builtin_deref(true).unwrap().ty);
|
|
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, impl Backend>,
|
|
layout: TyAndLayout<'tcx>,
|
|
) -> CValue<'tcx> {
|
|
if has_ptr_meta(fx.tcx, self.layout().ty) {
|
|
let (ptr, extra) = self.to_ptr_maybe_unsized();
|
|
CValue::by_val_pair(
|
|
ptr.get_addr(fx),
|
|
extra.expect("unsized type without metadata"),
|
|
layout,
|
|
)
|
|
} else {
|
|
CValue::by_val(self.to_ptr().get_addr(fx), layout)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn downcast_variant(
|
|
self,
|
|
fx: &FunctionCx<'_, 'tcx, impl Backend>,
|
|
variant: VariantIdx,
|
|
) -> Self {
|
|
assert!(!self.layout().is_unsized());
|
|
let layout = self.layout().for_variant(fx, variant);
|
|
CPlace {
|
|
inner: self.inner,
|
|
layout,
|
|
}
|
|
}
|
|
}
|