| //! Definition of [`CValue`] and [`CPlace`] |
| |
| use cranelift_codegen::entity::EntityRef; |
| use cranelift_codegen::ir::immediates::Offset32; |
| use cranelift_frontend::Variable; |
| use rustc_middle::ty::FnSig; |
| |
| use crate::prelude::*; |
| |
| fn codegen_field<'tcx>( |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| base: Pointer, |
| extra: Option<Value>, |
| layout: TyAndLayout<'tcx>, |
| field: FieldIdx, |
| ) -> (Pointer, TyAndLayout<'tcx>) { |
| let field_offset = layout.fields.offset(field.index()); |
| let field_layout = layout.field(&*fx, field.index()); |
| |
| let simple = |fx: &mut FunctionCx<'_, '_, '_>| { |
| (base.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()), field_layout) |
| }; |
| |
| if field_layout.is_sized() { |
| return simple(fx); |
| } |
| match field_layout.ty.kind() { |
| ty::Slice(..) | ty::Str => simple(fx), |
| _ => { |
| let unaligned_offset = field_offset.bytes(); |
| |
| // Get the alignment of the field |
| let (_, mut unsized_align) = crate::unsize::size_and_align_of(fx, field_layout, extra); |
| |
| // For packed types, we need to cap alignment. |
| if let ty::Adt(def, _) = layout.ty.kind() { |
| if let Some(packed) = def.repr().pack { |
| let packed = fx.bcx.ins().iconst(fx.pointer_type, packed.bytes() as i64); |
| let cmp = fx.bcx.ins().icmp(IntCC::UnsignedLessThan, unsized_align, packed); |
| unsized_align = fx.bcx.ins().select(cmp, unsized_align, packed); |
| } |
| } |
| |
| // Bump the unaligned offset up to the appropriate alignment |
| let one = fx.bcx.ins().iconst(fx.pointer_type, 1); |
| let align_sub_1 = fx.bcx.ins().isub(unsized_align, one); |
| let and_lhs = fx.bcx.ins().iadd_imm(align_sub_1, unaligned_offset as i64); |
| let zero = fx.bcx.ins().iconst(fx.pointer_type, 0); |
| let and_rhs = fx.bcx.ins().isub(zero, unsized_align); |
| let offset = fx.bcx.ins().band(and_lhs, and_rhs); |
| |
| (base.offset_value(fx, offset), field_layout) |
| } |
| } |
| } |
| |
| fn scalar_pair_calculate_b_offset(tcx: TyCtxt<'_>, a_scalar: Scalar, b_scalar: Scalar) -> Offset32 { |
| let b_offset = a_scalar.size(&tcx).align_to(b_scalar.align(&tcx).abi); |
| Offset32::new(b_offset.bytes().try_into().unwrap()) |
| } |
| |
| /// A read-only value |
| #[derive(Debug, Copy, Clone)] |
| pub(crate) struct CValue<'tcx>(CValueInner, TyAndLayout<'tcx>); |
| |
| #[derive(Debug, Copy, Clone)] |
| enum CValueInner { |
| ByRef(Pointer, Option<Value>), |
| ByVal(Value), |
| ByValPair(Value, Value), |
| } |
| |
| impl<'tcx> CValue<'tcx> { |
| pub(crate) fn by_ref(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CValue<'tcx> { |
| CValue(CValueInner::ByRef(ptr, None), layout) |
| } |
| |
| pub(crate) fn by_ref_unsized( |
| ptr: Pointer, |
| meta: Value, |
| layout: TyAndLayout<'tcx>, |
| ) -> CValue<'tcx> { |
| CValue(CValueInner::ByRef(ptr, Some(meta)), layout) |
| } |
| |
| pub(crate) fn by_val(value: Value, layout: TyAndLayout<'tcx>) -> CValue<'tcx> { |
| CValue(CValueInner::ByVal(value), layout) |
| } |
| |
| pub(crate) fn by_val_pair( |
| value: Value, |
| extra: Value, |
| layout: TyAndLayout<'tcx>, |
| ) -> CValue<'tcx> { |
| CValue(CValueInner::ByValPair(value, extra), layout) |
| } |
| |
| pub(crate) fn layout(&self) -> TyAndLayout<'tcx> { |
| self.1 |
| } |
| |
| // FIXME remove |
| pub(crate) fn force_stack(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Pointer, Option<Value>) { |
| let layout = self.1; |
| match self.0 { |
| CValueInner::ByRef(ptr, meta) => (ptr, meta), |
| CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => { |
| let cplace = CPlace::new_stack_slot(fx, layout); |
| cplace.write_cvalue(fx, self); |
| (cplace.to_ptr(), None) |
| } |
| } |
| } |
| |
| // FIXME remove |
| /// Forces the data value of a dyn* value to the stack and returns a pointer to it as well as the |
| /// vtable pointer. |
| pub(crate) fn dyn_star_force_data_on_stack( |
| self, |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| ) -> (Value, Value) { |
| assert!(self.1.ty.is_dyn_star()); |
| |
| match self.0 { |
| CValueInner::ByRef(ptr, None) => { |
| let (a_scalar, b_scalar) = match self.1.abi { |
| Abi::ScalarPair(a, b) => (a, b), |
| _ => unreachable!("dyn_star_force_data_on_stack({:?})", self), |
| }; |
| let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar); |
| let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar); |
| let mut flags = MemFlags::new(); |
| flags.set_notrap(); |
| let vtable = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags); |
| (ptr.get_addr(fx), vtable) |
| } |
| CValueInner::ByValPair(data, vtable) => { |
| let data_ptr = fx.create_stack_slot( |
| u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(), |
| u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(), |
| ); |
| data_ptr.store(fx, data, MemFlags::trusted()); |
| |
| (data_ptr.get_addr(fx), vtable) |
| } |
| CValueInner::ByRef(_, Some(_)) | CValueInner::ByVal(_) => { |
| unreachable!("dyn_star_force_data_on_stack({:?})", self) |
| } |
| } |
| } |
| |
| pub(crate) fn try_to_ptr(self) -> Option<(Pointer, Option<Value>)> { |
| match self.0 { |
| CValueInner::ByRef(ptr, meta) => Some((ptr, meta)), |
| CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => None, |
| } |
| } |
| |
| /// Load a value with layout.abi of scalar |
| #[track_caller] |
| pub(crate) fn load_scalar(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> Value { |
| let layout = self.1; |
| match self.0 { |
| CValueInner::ByRef(ptr, None) => { |
| let clif_ty = match layout.abi { |
| Abi::Scalar(scalar) => scalar_to_clif_type(fx.tcx, scalar), |
| Abi::Vector { element, count } => scalar_to_clif_type(fx.tcx, element) |
| .by(u32::try_from(count).unwrap()) |
| .unwrap(), |
| _ => unreachable!("{:?}", layout.ty), |
| }; |
| let mut flags = MemFlags::new(); |
| flags.set_notrap(); |
| ptr.load(fx, clif_ty, flags) |
| } |
| CValueInner::ByVal(value) => value, |
| CValueInner::ByRef(_, Some(_)) => bug!("load_scalar for unsized value not allowed"), |
| CValueInner::ByValPair(_, _) => bug!("Please use load_scalar_pair for ByValPair"), |
| } |
| } |
| |
| /// Load a value pair with layout.abi of scalar pair |
| #[track_caller] |
| pub(crate) fn load_scalar_pair(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Value, Value) { |
| let layout = self.1; |
| match self.0 { |
| CValueInner::ByRef(ptr, None) => { |
| let (a_scalar, b_scalar) = match layout.abi { |
| Abi::ScalarPair(a, b) => (a, b), |
| _ => unreachable!("load_scalar_pair({:?})", self), |
| }; |
| let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar); |
| let clif_ty1 = scalar_to_clif_type(fx.tcx, a_scalar); |
| let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar); |
| let mut flags = MemFlags::new(); |
| flags.set_notrap(); |
| let val1 = ptr.load(fx, clif_ty1, flags); |
| let val2 = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags); |
| (val1, val2) |
| } |
| CValueInner::ByRef(_, Some(_)) => { |
| bug!("load_scalar_pair for unsized value not allowed") |
| } |
| CValueInner::ByVal(_) => bug!("Please use load_scalar for ByVal"), |
| CValueInner::ByValPair(val1, val2) => (val1, val2), |
| } |
| } |
| |
| pub(crate) fn value_field( |
| self, |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| field: FieldIdx, |
| ) -> CValue<'tcx> { |
| let layout = self.1; |
| match self.0 { |
| CValueInner::ByVal(_) => unreachable!(), |
| CValueInner::ByValPair(val1, val2) => match layout.abi { |
| Abi::ScalarPair(_, _) => { |
| let val = match field.as_u32() { |
| 0 => val1, |
| 1 => val2, |
| _ => bug!("field should be 0 or 1"), |
| }; |
| let field_layout = layout.field(&*fx, usize::from(field)); |
| CValue::by_val(val, field_layout) |
| } |
| _ => unreachable!("value_field for ByValPair with abi {:?}", layout.abi), |
| }, |
| CValueInner::ByRef(ptr, None) => { |
| let (field_ptr, field_layout) = codegen_field(fx, ptr, None, layout, field); |
| CValue::by_ref(field_ptr, field_layout) |
| } |
| CValueInner::ByRef(_, Some(_)) => todo!(), |
| } |
| } |
| |
| /// Like [`CValue::value_field`] except handling ADTs containing a single array field in a way |
| /// such that you can access individual lanes. |
| pub(crate) fn value_lane( |
| self, |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| lane_idx: u64, |
| ) -> CValue<'tcx> { |
| let layout = self.1; |
| 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.0 { |
| CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(), |
| CValueInner::ByRef(ptr, None) => { |
| let field_offset = lane_layout.size * lane_idx; |
| let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()); |
| CValue::by_ref(field_ptr, lane_layout) |
| } |
| CValueInner::ByRef(_, Some(_)) => unreachable!(), |
| } |
| } |
| |
| /// Like [`CValue::value_field`] except using the passed type as lane type instead of the one |
| /// specified by the vector type. |
| pub(crate) fn value_typed_lane( |
| self, |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| lane_ty: Ty<'tcx>, |
| lane_idx: u64, |
| ) -> CValue<'tcx> { |
| let layout = self.1; |
| 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.0 { |
| CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(), |
| CValueInner::ByRef(ptr, None) => { |
| let field_offset = lane_layout.size * lane_idx; |
| let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()); |
| CValue::by_ref(field_ptr, lane_layout) |
| } |
| CValueInner::ByRef(_, Some(_)) => unreachable!(), |
| } |
| } |
| |
| /// Like [`CValue::value_lane`] except allowing a dynamically calculated lane index. |
| pub(crate) fn value_lane_dyn( |
| self, |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| lane_idx: Value, |
| ) -> CValue<'tcx> { |
| let layout = self.1; |
| 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); |
| match self.0 { |
| CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => unreachable!(), |
| CValueInner::ByRef(ptr, None) => { |
| let field_offset = fx.bcx.ins().imul_imm(lane_idx, lane_layout.size.bytes() as i64); |
| let field_ptr = ptr.offset_value(fx, field_offset); |
| CValue::by_ref(field_ptr, lane_layout) |
| } |
| CValueInner::ByRef(_, Some(_)) => unreachable!(), |
| } |
| } |
| |
| /// If `ty` is signed, `const_val` must already be sign extended. |
| pub(crate) fn const_val( |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| layout: TyAndLayout<'tcx>, |
| const_val: ty::ScalarInt, |
| ) -> CValue<'tcx> { |
| assert_eq!(const_val.size(), layout.size, "{:#?}: {:?}", const_val, layout); |
| use cranelift_codegen::ir::immediates::{Ieee32, Ieee64}; |
| |
| let clif_ty = fx.clif_type(layout.ty).unwrap(); |
| |
| if let ty::Bool = layout.ty.kind() { |
| assert!( |
| const_val == ty::ScalarInt::FALSE || const_val == ty::ScalarInt::TRUE, |
| "Invalid bool 0x{:032X}", |
| const_val |
| ); |
| } |
| |
| let val = match layout.ty.kind() { |
| ty::Uint(UintTy::U128) | ty::Int(IntTy::I128) => { |
| let const_val = const_val.assert_bits(layout.size); |
| let lsb = fx.bcx.ins().iconst(types::I64, const_val as u64 as i64); |
| let msb = fx.bcx.ins().iconst(types::I64, (const_val >> 64) as u64 as i64); |
| fx.bcx.ins().iconcat(lsb, msb) |
| } |
| ty::Bool |
| | ty::Char |
| | ty::Uint(_) |
| | ty::Int(_) |
| | ty::Ref(..) |
| | ty::RawPtr(..) |
| | ty::FnPtr(..) => { |
| let raw_val = const_val.size().truncate(const_val.assert_bits(layout.size)); |
| fx.bcx.ins().iconst(clif_ty, raw_val as i64) |
| } |
| ty::Float(FloatTy::F32) => { |
| fx.bcx.ins().f32const(Ieee32::with_bits(u32::try_from(const_val).unwrap())) |
| } |
| ty::Float(FloatTy::F64) => { |
| fx.bcx.ins().f64const(Ieee64::with_bits(u64::try_from(const_val).unwrap())) |
| } |
| _ => panic!( |
| "CValue::const_val for non bool/char/float/integer/pointer type {:?} is not allowed", |
| layout.ty |
| ), |
| }; |
| |
| CValue::by_val(val, layout) |
| } |
| |
| pub(crate) fn cast_pointer_to(self, layout: TyAndLayout<'tcx>) -> Self { |
| assert!(matches!(self.layout().ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..))); |
| assert!(matches!(layout.ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..))); |
| assert_eq!(self.layout().abi, layout.abi); |
| CValue(self.0, layout) |
| } |
| } |
| |
| /// A place where you can write a value to or read a value from |
| #[derive(Debug, Copy, Clone)] |
| pub(crate) struct CPlace<'tcx> { |
| inner: CPlaceInner, |
| layout: TyAndLayout<'tcx>, |
| } |
| |
| #[derive(Debug, Copy, Clone)] |
| enum CPlaceInner { |
| Var(Local, Variable), |
| VarPair(Local, Variable, Variable), |
| Addr(Pointer, Option<Value>), |
| } |
| |
| impl<'tcx> CPlace<'tcx> { |
| pub(crate) fn layout(&self) -> TyAndLayout<'tcx> { |
| self.layout |
| } |
| |
| pub(crate) fn new_stack_slot( |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| layout: TyAndLayout<'tcx>, |
| ) -> CPlace<'tcx> { |
| assert!(layout.is_sized()); |
| if layout.size.bytes() == 0 { |
| return CPlace { |
| inner: CPlaceInner::Addr(Pointer::dangling(layout.align.pref), None), |
| layout, |
| }; |
| } |
| |
| if layout.size.bytes() >= u64::from(u32::MAX - 16) { |
| fx.tcx |
| .dcx() |
| .fatal(format!("values of type {} are too big to store on the stack", layout.ty)); |
| } |
| |
| let stack_slot = fx.create_stack_slot( |
| u32::try_from(layout.size.bytes()).unwrap(), |
| u32::try_from(layout.align.pref.bytes()).unwrap(), |
| ); |
| CPlace { inner: CPlaceInner::Addr(stack_slot, None), layout } |
| } |
| |
| pub(crate) fn new_var( |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| local: Local, |
| layout: TyAndLayout<'tcx>, |
| ) -> CPlace<'tcx> { |
| let var = Variable::from_u32(fx.next_ssa_var); |
| fx.next_ssa_var += 1; |
| fx.bcx.declare_var(var, fx.clif_type(layout.ty).unwrap()); |
| CPlace { inner: CPlaceInner::Var(local, var), layout } |
| } |
| |
| pub(crate) fn new_var_pair( |
| fx: &mut FunctionCx<'_, '_, 'tcx>, |
| local: Local, |
| layout: TyAndLayout<'tcx>, |
| ) -> CPlace<'tcx> { |
| let var1 = Variable::from_u32(fx.next_ssa_var); |
| fx.next_ssa_var += 1; |
| let var2 = Variable::from_u32(fx.next_ssa_var); |
| fx.next_ssa_var += 1; |
| |
| 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.abi { |
| Abi::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.abi { |
| Abi::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.abi == Abi::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().abi { |
| Abi::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 abi {:?} for ByValPair CValue", dst_layout.abi), |
| }, |
| CValueInner::ByRef(from_ptr, None) => { |
| match from.layout().abi { |
| Abi::Scalar(_) => { |
| let val = from.load_scalar(fx); |
| to_ptr.store(fx, val, flags); |
| return; |
| } |
| Abi::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(); |
| 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.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().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>, |
| 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, |
| unsafety: 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, |
| unsafety: 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, |
| ); |
| } |
| } |
| } |
