+//! Definition of [`CValue`] and [`CPlace`]
+
use crate::prelude::*;
-fn codegen_field<'a, 'tcx: 'a>(
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
- base: Value,
- layout: TyLayout<'tcx>,
+use cranelift_codegen::entity::EntityRef;
+use cranelift_codegen::ir::immediates::Offset32;
+
+fn codegen_field<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ base: Pointer,
+ extra: Option<Value>,
+ layout: TyAndLayout<'tcx>,
field: mir::Field,
-) -> (Value, TyLayout<'tcx>) {
+) -> (Pointer, TyAndLayout<'tcx>) {
let field_offset = layout.fields.offset(field.index());
- let field_ty = layout.field(&*fx, field.index());
- if field_offset.bytes() > 0 {
+ let field_layout = layout.field(&*fx, field.index());
+
+ let simple = |fx: &mut FunctionCx<'_, '_, _>| {
(
- fx.bcx.ins().iadd_imm(base, field_offset.bytes() as i64),
- field_ty,
+ base.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()),
+ field_layout,
)
+ };
+
+ if let Some(extra) = extra {
+ if !field_layout.is_unsized() {
+ return simple(fx);
+ }
+ match field_layout.ty.kind() {
+ ty::Slice(..) | ty::Str | ty::Foreign(..) => simple(fx),
+ ty::Adt(def, _) if def.repr.packed() => {
+ assert_eq!(layout.align.abi.bytes(), 1);
+ simple(fx)
+ }
+ _ => {
+ // We have to align the offset for DST's
+ let unaligned_offset = field_offset.bytes();
+ let (_, unsized_align) =
+ crate::unsize::size_and_align_of_dst(fx, field_layout, extra);
+
+ let one = fx.bcx.ins().iconst(pointer_ty(fx.tcx), 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(pointer_ty(fx.tcx), 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)
+ }
+ }
} else {
- (base, field_ty)
+ simple(fx)
}
}
-fn scalar_pair_calculate_b_offset(tcx: TyCtxt<'_>, a_scalar: &Scalar, b_scalar: &Scalar) -> i32 {
- let b_offset = a_scalar.value.size(&tcx).align_to(b_scalar.value.align(&tcx).abi);
- b_offset.bytes().try_into().unwrap()
+fn scalar_pair_calculate_b_offset(
+ tcx: TyCtxt<'_>,
+ a_scalar: &Scalar,
+ b_scalar: &Scalar,
+) -> Offset32 {
+ let b_offset = a_scalar
+ .value
+ .size(&tcx)
+ .align_to(b_scalar.value.align(&tcx).abi);
+ Offset32::new(b_offset.bytes().try_into().unwrap())
}
/// A read-only value
#[derive(Debug, Copy, Clone)]
-pub struct CValue<'tcx>(CValueInner, TyLayout<'tcx>);
+pub(crate) struct CValue<'tcx>(CValueInner, TyAndLayout<'tcx>);
#[derive(Debug, Copy, Clone)]
enum CValueInner {
- ByRef(Value),
+ ByRef(Pointer, Option<Value>),
ByVal(Value),
ByValPair(Value, Value),
}
impl<'tcx> CValue<'tcx> {
- pub fn by_ref(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
- CValue(CValueInner::ByRef(value), layout)
+ pub(crate) fn by_ref(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
+ CValue(CValueInner::ByRef(ptr, None), layout)
}
- pub fn by_val(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
+ 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 fn by_val_pair(value: Value, extra: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
+ pub(crate) fn by_val_pair(
+ value: Value,
+ extra: Value,
+ layout: TyAndLayout<'tcx>,
+ ) -> CValue<'tcx> {
CValue(CValueInner::ByValPair(value, extra), layout)
}
- pub fn layout(&self) -> TyLayout<'tcx> {
+ pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
self.1
}
- pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
- where
- 'tcx: 'a,
- {
+ // FIXME remove
+ pub(crate) fn force_stack(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ ) -> (Pointer, Option<Value>) {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(value) => value,
+ CValueInner::ByRef(ptr, meta) => (ptr, meta),
CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => {
- let cplace = CPlace::new_stack_slot(fx, layout.ty);
+ let cplace = CPlace::new_stack_slot(fx, layout);
cplace.write_cvalue(fx, self);
- cplace.to_addr(fx)
+ (cplace.to_ptr(), None)
}
}
}
+ 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
- pub fn load_scalar<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
- where
- 'tcx: 'a,
- {
+ pub(crate) fn load_scalar(self, fx: &mut FunctionCx<'_, 'tcx, impl Module>) -> Value {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
- let scalar = match layout.abi {
- layout::Abi::Scalar(ref scalar) => scalar.clone(),
- _ => unreachable!(),
+ CValueInner::ByRef(ptr, None) => {
+ let clif_ty = match layout.abi {
+ Abi::Scalar(ref scalar) => scalar_to_clif_type(fx.tcx, scalar.clone()),
+ Abi::Vector { ref element, count } => {
+ scalar_to_clif_type(fx.tcx, element.clone())
+ .by(u16::try_from(count).unwrap())
+ .unwrap()
+ }
+ _ => unreachable!("{:?}", layout.ty),
};
- let clif_ty = scalar_to_clif_type(fx.tcx, scalar);
- fx.bcx.ins().load(clif_ty, MemFlags::new(), addr, 0)
+ 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
- pub fn load_scalar_pair<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> (Value, Value)
- where
- 'tcx: 'a,
- {
+ pub(crate) fn load_scalar_pair(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ ) -> (Value, Value) {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
+ CValueInner::ByRef(ptr, None) => {
let (a_scalar, b_scalar) = match &layout.abi {
- layout::Abi::ScalarPair(a, b) => (a, b),
- _ => unreachable!(),
+ 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.clone());
let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar.clone());
- let val1 = fx.bcx.ins().load(clif_ty1, MemFlags::new(), addr, 0);
- let val2 = fx.bcx.ins().load(
- clif_ty2,
- MemFlags::new(),
- addr,
- b_offset,
- );
+ 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 fn value_field<'a>(
+ pub(crate) fn value_field(
self,
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
field: mir::Field,
- ) -> CValue<'tcx>
- where
- 'tcx: 'a,
- {
+ ) -> CValue<'tcx> {
let layout = self.1;
- let base = match self.0 {
- CValueInner::ByRef(addr) => addr,
- _ => bug!("place_field for {:?}", self),
- };
-
- let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
- CValue::by_ref(field_ptr, field_layout)
+ match self.0 {
+ CValueInner::ByVal(val) => match layout.abi {
+ Abi::Vector { element: _, count } => {
+ let count = u8::try_from(count).expect("SIMD type with more than 255 lanes???");
+ let field = u8::try_from(field.index()).unwrap();
+ assert!(field < count);
+ let lane = fx.bcx.ins().extractlane(val, field);
+ let field_layout = layout.field(&*fx, usize::from(field));
+ CValue::by_val(lane, field_layout)
+ }
+ _ => unreachable!("value_field for ByVal with abi {:?}", layout.abi),
+ },
+ 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!(),
+ }
}
- pub fn unsize_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
+ pub(crate) fn unsize_value(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ dest: CPlace<'tcx>,
+ ) {
crate::unsize::coerce_unsized_into(fx, self, dest);
}
- pub fn const_val<'a>(
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
- ty: Ty<'tcx>,
- const_val: i64,
- ) -> CValue<'tcx>
- where
- 'tcx: 'a,
- {
- let clif_ty = fx.clif_type(ty).unwrap();
- let layout = fx.layout_of(ty);
- CValue::by_val(fx.bcx.ins().iconst(clif_ty, const_val), layout)
+ /// If `ty` is signed, `const_val` must already be sign extended.
+ pub(crate) fn const_val(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ layout: TyAndLayout<'tcx>,
+ const_val: ty::ScalarInt,
+ ) -> CValue<'tcx> {
+ assert_eq!(const_val.size(), layout.size);
+ 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.to_bits(layout.size).unwrap();
+ 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(..) => {
+ fx
+ .bcx
+ .ins()
+ .iconst(clif_ty, const_val.to_bits(layout.size).unwrap() 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 fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
+ 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 enum CPlace<'tcx> {
- Var(Local, TyLayout<'tcx>),
- Addr(Value, Option<Value>, TyLayout<'tcx>),
- Stack(StackSlot, TyLayout<'tcx>),
- NoPlace(TyLayout<'tcx>),
+pub(crate) struct CPlace<'tcx> {
+ inner: CPlaceInner,
+ layout: TyAndLayout<'tcx>,
}
-impl<'a, 'tcx: 'a> CPlace<'tcx> {
- pub fn layout(&self) -> TyLayout<'tcx> {
- match *self {
- CPlace::Var(_, layout)
- | CPlace::Addr(_, _, layout)
- | CPlace::Stack(_, layout)
- | CPlace::NoPlace(layout) => layout,
- }
+#[derive(Debug, Copy, Clone)]
+pub(crate) enum CPlaceInner {
+ Var(Local, Variable),
+ VarPair(Local, Variable, Variable),
+ VarLane(Local, Variable, u8),
+ Addr(Pointer, Option<Value>),
+}
+
+impl<'tcx> CPlace<'tcx> {
+ pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
+ self.layout
}
- pub fn no_place(layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace::NoPlace(layout)
+ pub(crate) fn inner(&self) -> &CPlaceInner {
+ &self.inner
}
- pub fn new_stack_slot(
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
- ty: Ty<'tcx>,
+ pub(crate) fn no_place(layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
+ CPlace {
+ inner: CPlaceInner::Addr(Pointer::dangling(layout.align.pref), None),
+ layout,
+ }
+ }
+
+ pub(crate) fn new_stack_slot(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ layout: TyAndLayout<'tcx>,
) -> CPlace<'tcx> {
- let layout = fx.layout_of(ty);
assert!(!layout.is_unsized());
if layout.size.bytes() == 0 {
- return CPlace::NoPlace(layout);
+ return CPlace::no_place(layout);
}
let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
kind: StackSlotKind::ExplicitSlot,
- size: layout.size.bytes() as u32,
+ // FIXME Don't force the size to a multiple of 16 bytes once Cranelift gets a way to
+ // specify stack slot alignment.
+ size: (u32::try_from(layout.size.bytes()).unwrap() + 15) / 16 * 16,
offset: None,
});
- CPlace::Stack(stack_slot, layout)
+ CPlace {
+ inner: CPlaceInner::Addr(Pointer::stack_slot(stack_slot), None),
+ layout,
+ }
+ }
+
+ pub(crate) fn new_var(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ local: Local,
+ layout: TyAndLayout<'tcx>,
+ ) -> CPlace<'tcx> {
+ let var = Variable::with_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 fn new_var(
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
+ pub(crate) fn new_var_pair(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
local: Local,
- layout: TyLayout<'tcx>,
+ layout: TyAndLayout<'tcx>,
) -> CPlace<'tcx> {
- fx.bcx
- .declare_var(mir_var(local), fx.clif_type(layout.ty).unwrap());
- CPlace::Var(local, layout)
+ let var1 = Variable::with_u32(fx.next_ssa_var);
+ fx.next_ssa_var += 1;
+ let var2 = Variable::with_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 fn for_addr(addr: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace::Addr(addr, None, layout)
+ pub(crate) fn for_ptr(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
+ CPlace {
+ inner: CPlaceInner::Addr(ptr, None),
+ layout,
+ }
}
- pub fn for_addr_with_extra(addr: Value, extra: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace::Addr(addr, Some(extra), 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 fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
- match self {
- CPlace::Var(var, layout) => CValue::by_val(fx.bcx.use_var(mir_var(var)), layout),
- CPlace::Addr(addr, extra, layout) => {
- assert!(extra.is_none(), "unsized values are not yet supported");
- CValue::by_ref(addr, layout)
+ pub(crate) fn to_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Module>) -> 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)
}
- CPlace::Stack(stack_slot, layout) => CValue::by_ref(
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- layout,
- ),
- CPlace::NoPlace(layout) => CValue::by_ref(
+ CPlaceInner::VarPair(_local, var1, var2) => {
+ let val1 = fx.bcx.use_var(var1);
fx.bcx
- .ins()
- .iconst(fx.pointer_type, fx.pointer_type.bytes() as i64),
- layout,
- ),
+ .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::VarLane(_local, var, lane) => {
+ let val = fx.bcx.use_var(var);
+ fx.bcx
+ .set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
+ let val = fx.bcx.ins().extractlane(val, lane);
+ CValue::by_val(val, layout)
+ }
+ CPlaceInner::Addr(ptr, extra) => {
+ if let Some(extra) = extra {
+ CValue::by_ref_unsized(ptr, extra, layout)
+ } else {
+ CValue::by_ref(ptr, layout)
+ }
+ }
}
}
- pub fn to_addr(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value {
- match self.to_addr_maybe_unsized(fx) {
- (addr, None) => addr,
+ pub(crate) fn to_ptr(self) -> Pointer {
+ match self.to_ptr_maybe_unsized() {
+ (ptr, None) => ptr,
(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
}
}
- pub fn to_addr_maybe_unsized(
- self,
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
- ) -> (Value, Option<Value>) {
- match self {
- CPlace::Addr(addr, extra, _layout) => (addr, extra),
- CPlace::Stack(stack_slot, _layout) => (
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- None,
- ),
- CPlace::NoPlace(_) => (fx.bcx.ins().iconst(fx.pointer_type, 45), None),
- CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
+ pub(crate) fn to_ptr_maybe_unsized(self) -> (Pointer, Option<Value>) {
+ match self.inner {
+ CPlaceInner::Addr(ptr, extra) => (ptr, extra),
+ CPlaceInner::Var(_, _)
+ | CPlaceInner::VarPair(_, _, _)
+ | CPlaceInner::VarLane(_, _, _) => bug!("Expected CPlace::Addr, found {:?}", self),
}
}
- pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
- use rustc::hir::Mutability::*;
+ pub(crate) fn write_cvalue(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ from: CValue<'tcx>,
+ ) {
+ assert_assignable(fx, from.layout().ty, self.layout().ty);
- let from_ty = from.layout().ty;
- let to_ty = self.layout().ty;
+ self.write_cvalue_maybe_transmute(fx, from, "write_cvalue");
+ }
- fn assert_assignable<'a, 'tcx: 'a>(fx: &FunctionCx<'a, 'tcx, impl Backend>, from_ty: Ty<'tcx>, to_ty: Ty<'tcx>) {
- match (&from_ty.sty, &to_ty.sty) {
- (ty::Ref(_, t, MutImmutable), ty::Ref(_, u, MutImmutable))
- | (ty::Ref(_, t, MutMutable), ty::Ref(_, u, MutImmutable))
- | (ty::Ref(_, t, MutMutable), ty::Ref(_, u, MutMutable)) => {
- assert_assignable(fx, t, u);
- // &mut T -> &T is allowed
- // &'a T -> &'b T is allowed
- }
- (ty::Ref(_, _, MutImmutable), ty::Ref(_, _, MutMutable)) => {
- panic!("Cant assign value of type {} to place of type {}", from_ty, to_ty)
- }
- (ty::FnPtr(_), ty::FnPtr(_)) => {
- let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
- 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
+ pub(crate) fn write_cvalue_transmute(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ from: CValue<'tcx>,
+ ) {
+ self.write_cvalue_maybe_transmute(fx, from, "write_cvalue_transmute");
+ }
+
+ fn write_cvalue_maybe_transmute(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ from: CValue<'tcx>,
+ #[cfg_attr(not(debug_assertions), allow(unused_variables))] method: &'static str,
+ ) {
+ fn transmute_value<'tcx>(
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ 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) => fx.bcx.ins().bitcast(dst_ty, data),
+ _ if src_ty.is_vector() && dst_ty.is_vector() => {
+ fx.bcx.ins().raw_bitcast(dst_ty, data)
}
- _ => {
- assert_eq!(
- from_ty,
- to_ty,
- "Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
- from_ty,
- to_ty,
- fx,
- );
+ _ if src_ty.is_vector() || dst_ty.is_vector() => {
+ // FIXME do something more efficient for transmutes between vectors and integers.
+ let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
+ kind: StackSlotKind::ExplicitSlot,
+ // FIXME Don't force the size to a multiple of 16 bytes once Cranelift gets a way to
+ // specify stack slot alignment.
+ size: (src_ty.bytes() + 15) / 16 * 16,
+ offset: None,
+ });
+ let ptr = Pointer::stack_slot(stack_slot);
+ ptr.store(fx, data, MemFlags::trusted());
+ ptr.load(fx, dst_ty, MemFlags::trusted())
}
- }
+ _ => 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_assignable(fx, from_ty, to_ty);
+ 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 (addr, dst_layout) = match self {
- CPlace::Var(var, _) => {
+ 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);
- fx.bcx.def_var(mir_var(var), data);
+
+ // 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;
}
- CPlace::Addr(addr, None, dst_layout) => (addr, dst_layout),
- CPlace::Stack(stack_slot, dst_layout) => (
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- dst_layout,
- ),
- CPlace::NoPlace(layout) => {
- if layout.abi != Abi::Uninhabited {
- assert_eq!(layout.size.bytes(), 0, "{:?}", layout);
+ CPlaceInner::Addr(ptr, None) => {
+ if dst_layout.size == Size::ZERO || dst_layout.abi == Abi::Uninhabited {
+ return;
}
- return;
+ ptr
}
- CPlace::Addr(_, _, _) => bug!("Can't write value to unsized place {:?}", self),
+ 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) => {
- fx.bcx.ins().store(MemFlags::new(), val, addr, 0);
+ to_ptr.store(fx, val, flags);
}
- CValueInner::ByValPair(value, extra) => {
- match dst_layout.abi {
- Abi::ScalarPair(ref a_scalar, ref b_scalar) => {
- let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
- fx.bcx.ins().store(MemFlags::new(), value, addr, 0);
- fx.bcx.ins().store(
- MemFlags::new(),
- extra,
- addr,
- b_offset,
- );
- }
- _ => bug!(
- "Non ScalarPair abi {:?} for ByValPair CValue",
- dst_layout.abi
- ),
- }
+ CValueInner::ByValPair(_, _) => {
+ bug!(
+ "Non ScalarPair abi {:?} for ByValPair CValue",
+ dst_layout.abi
+ );
}
- CValueInner::ByRef(from_addr) => {
+ 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_memcpy(
- fx.module.target_config(),
- addr,
+ 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 fn place_field(
+ pub(crate) fn place_field(
self,
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
field: mir::Field,
) -> CPlace<'tcx> {
let layout = self.layout();
- let (base, extra) = self.to_addr_maybe_unsized(fx);
- let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
- let extra = if field_layout.is_unsized() {
- assert!(extra.is_some());
- extra
+ 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 {
- None
- };
- CPlace::Addr(field_ptr, extra, field_layout)
+ CPlace::for_ptr(field_ptr, field_layout)
+ }
}
- pub fn place_index(
+ pub(crate) fn place_index(
self,
- fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
index: Value,
) -> CPlace<'tcx> {
- let (elem_layout, addr) = match self.layout().ty.sty {
- ty::Array(elem_ty, _) => (fx.layout_of(elem_ty), self.to_addr(fx)),
- ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_addr_maybe_unsized(fx).0),
+ 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),
};
.ins()
.imul_imm(index, elem_layout.size.bytes() as i64);
- CPlace::Addr(fx.bcx.ins().iadd(addr, offset), None, elem_layout)
+ CPlace::for_ptr(ptr.offset_value(fx, offset), elem_layout)
}
- pub fn place_deref(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CPlace<'tcx> {
+ pub(crate) fn place_deref(self, fx: &mut FunctionCx<'_, 'tcx, impl Module>) -> CPlace<'tcx> {
let inner_layout = fx.layout_of(self.layout().ty.builtin_deref(true).unwrap().ty);
- if !inner_layout.is_unsized() {
- CPlace::Addr(self.to_cvalue(fx).load_scalar(fx), None, inner_layout)
- } else {
+ if has_ptr_meta(fx.tcx, inner_layout.ty) {
let (addr, extra) = self.to_cvalue(fx).load_scalar_pair(fx);
- CPlace::Addr(addr, Some(extra), inner_layout)
- }
- }
-
- pub fn write_place_ref(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
- if !self.layout().is_unsized() {
- let ptr = CValue::by_val(self.to_addr(fx), dest.layout());
- dest.write_cvalue(fx, ptr);
+ CPlace::for_ptr_with_extra(Pointer::new(addr), extra, inner_layout)
} else {
- let (value, extra) = self.to_addr_maybe_unsized(fx);
- let ptr = CValue::by_val_pair(value, extra.expect("unsized type without metadata"), dest.layout());
- dest.write_cvalue(fx, ptr);
+ CPlace::for_ptr(
+ Pointer::new(self.to_cvalue(fx).load_scalar(fx)),
+ inner_layout,
+ )
}
}
- pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
- assert!(!self.layout().is_unsized());
- match self {
- CPlace::Var(var, _) => CPlace::Var(var, layout),
- CPlace::Addr(addr, extra, _) => CPlace::Addr(addr, extra, layout),
- CPlace::Stack(stack_slot, _) => CPlace::Stack(stack_slot, layout),
- CPlace::NoPlace(_) => {
- assert!(layout.size.bytes() == 0);
- CPlace::NoPlace(layout)
- }
+ pub(crate) fn place_ref(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Module>,
+ 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 fn downcast_variant(
+ pub(crate) fn downcast_variant(
self,
- fx: &FunctionCx<'a, 'tcx, impl Backend>,
+ fx: &FunctionCx<'_, 'tcx, impl Module>,
variant: VariantIdx,
) -> Self {
+ assert!(!self.layout().is_unsized());
let layout = self.layout().for_variant(fx, variant);
- self.unchecked_cast_to(layout)
+ CPlace {
+ inner: self.inner,
+ layout,
+ }
+ }
+}
+
+#[track_caller]
+pub(crate) fn assert_assignable<'tcx>(
+ fx: &FunctionCx<'_, 'tcx, impl Module>,
+ from_ty: Ty<'tcx>,
+ to_ty: Ty<'tcx>,
+) {
+ match (from_ty.kind(), to_ty.kind()) {
+ (ty::Ref(_, a, _), ty::Ref(_, b, _))
+ | (
+ ty::RawPtr(TypeAndMut { ty: a, mutbl: _ }),
+ ty::RawPtr(TypeAndMut { ty: b, mutbl: _ }),
+ ) => {
+ assert_assignable(fx, a, b);
+ }
+ (ty::Ref(_, a, _), ty::RawPtr(TypeAndMut { ty: b, mutbl: _ }))
+ | (ty::RawPtr(TypeAndMut { ty: a, mutbl: _ }), ty::Ref(_, b, _)) => {
+ assert_assignable(fx, a, b);
+ }
+ (ty::FnPtr(_), ty::FnPtr(_)) => {
+ let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
+ 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, _)) => {
+ 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
+ }
+ _ => {
+ assert_eq!(
+ from_ty, to_ty,
+ "Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
+ from_ty, to_ty, fx,
+ );
+ }
}
}
projects / rust.git / blobdiff