use crate::prelude::*;
+use cranelift_codegen::ir::immediates::Offset32;
+
fn codegen_field<'tcx>(
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- base: Value,
+ base: Pointer,
+ extra: Option<Value>,
layout: TyLayout<'tcx>,
field: mir::Field,
-) -> (Value, TyLayout<'tcx>) {
+) -> (Pointer, TyLayout<'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(..) => return simple(fx),
+ ty::Adt(def, _) if def.repr.packed() => {
+ assert_eq!(layout.align.abi.bytes(), 1);
+ return 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.ty, 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)]
enum CValueInner {
- ByRef(Value),
+ ByRef(Pointer),
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 fn by_ref(ptr: Pointer, layout: TyLayout<'tcx>) -> CValue<'tcx> {
+ CValue(CValueInner::ByRef(ptr), layout)
}
pub fn by_val(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
self.1
}
- pub fn force_stack<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
+ pub fn force_stack<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Pointer {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(value) => value,
+ CValueInner::ByRef(ptr) => ptr,
CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => {
let cplace = CPlace::new_stack_slot(fx, layout.ty);
cplace.write_cvalue(fx, self);
- cplace.to_addr(fx)
+ cplace.to_ptr(fx)
}
}
}
pub fn try_to_addr(self) -> Option<Value> {
match self.0 {
- CValueInner::ByRef(addr) => Some(addr),
+ CValueInner::ByRef(ptr) => {
+ if let Some((base_addr, offset)) = ptr.try_get_addr_and_offset() {
+ if offset == Offset32::new(0) {
+ Some(base_addr)
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ }
CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => None,
}
}
pub fn load_scalar<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
- let scalar = match layout.abi {
- layout::Abi::Scalar(ref scalar) => scalar.clone(),
+ CValueInner::ByRef(ptr) => {
+ let clif_ty = match layout.abi {
+ layout::Abi::Scalar(ref scalar) => scalar_to_clif_type(fx.tcx, scalar.clone()),
+ layout::Abi::Vector { ref element, count } => {
+ scalar_to_clif_type(fx.tcx, element.clone())
+ .by(u16::try_from(count).unwrap()).unwrap()
+ }
_ => unreachable!(),
};
- let clif_ty = scalar_to_clif_type(fx.tcx, scalar);
- fx.bcx.ins().load(clif_ty, MemFlags::new(), addr, 0)
+ ptr.load(fx, clif_ty, MemFlags::new())
}
CValueInner::ByVal(value) => value,
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<'_, 'tcx, impl Backend>) -> (Value, Value) {
+ pub fn load_scalar_pair<'a>(
+ self,
+ fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ ) -> (Value, Value) {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
+ CValueInner::ByRef(ptr) => {
let (a_scalar, b_scalar) = match &layout.abi {
layout::Abi::ScalarPair(a, b) => (a, b),
- _ => unreachable!(),
+ _ => 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 val1 = ptr.load(fx, clif_ty1, MemFlags::new());
+ let val2 = ptr.offset(fx, b_offset).load(fx, clif_ty2, MemFlags::new());
(val1, val2)
}
CValueInner::ByVal(_) => bug!("Please use load_scalar for ByVal"),
field: mir::Field,
) -> CValue<'tcx> {
let layout = self.1;
- let base = match self.0 {
- CValueInner::ByRef(addr) => addr,
+ match self.0 {
+ CValueInner::ByVal(val) => {
+ match layout.abi {
+ layout::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::ByRef(ptr) => {
+ let (field_ptr, field_layout) = codegen_field(fx, ptr, None, layout, field);
+ CValue::by_ref(field_ptr, field_layout)
+ }
_ => bug!("place_field for {:?}", self),
- };
-
- let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
- CValue::by_ref(field_ptr, field_layout)
+ }
}
pub fn unsize_value<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
let clif_ty = fx.clif_type(ty).unwrap();
let layout = fx.layout_of(ty);
- let val = match ty.sty {
+ let val = match ty.kind {
ty::TyKind::Uint(UintTy::U128) | ty::TyKind::Int(IntTy::I128) => {
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);
+ let msb = fx
+ .bcx
+ .ins()
+ .iconst(types::I64, (const_val >> 64) as u64 as i64);
fx.bcx.ins().iconcat(lsb, msb)
}
ty::TyKind::Bool => {
- assert!(const_val == 0 || const_val == 1, "Invalid bool 0x{:032X}", const_val);
+ assert!(
+ const_val == 0 || const_val == 1,
+ "Invalid bool 0x{:032X}",
+ const_val
+ );
fx.bcx.ins().iconst(types::I8, const_val as i64)
}
- ty::TyKind::Uint(_) | ty::TyKind::Ref(..) | ty::TyKind::RawPtr(.. )=> {
- fx.bcx.ins().iconst(clif_ty, u64::try_from(const_val).expect("uint") as i64)
- }
- ty::TyKind::Int(_) => {
- fx.bcx.ins().iconst(clif_ty, const_val as i128 as i64)
- }
- _ => panic!("CValue::const_val for non bool/integer/pointer type {:?} is not allowed", ty),
+ ty::TyKind::Uint(_) | ty::TyKind::Ref(..) | ty::TyKind::RawPtr(..) => fx
+ .bcx
+ .ins()
+ .iconst(clif_ty, u64::try_from(const_val).expect("uint") as i64),
+ ty::TyKind::Int(_) => fx.bcx.ins().iconst(clif_ty, const_val as i128 as i64),
+ _ => panic!(
+ "CValue::const_val for non bool/integer/pointer type {:?} is not allowed",
+ ty
+ ),
};
CValue::by_val(val, layout)
#[derive(Debug, Copy, Clone)]
pub enum CPlaceInner {
Var(Local),
- Addr(Value, Option<Value>),
- Stack(StackSlot),
+ Addr(Pointer, Option<Value>),
NoPlace,
}
}
pub fn no_place(layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace{
+ CPlace {
inner: CPlaceInner::NoPlace,
- layout
+ layout,
}
}
offset: None,
});
CPlace {
- inner: CPlaceInner::Stack(stack_slot),
+ inner: CPlaceInner::Addr(Pointer::stack_slot(stack_slot), None),
layout,
}
}
}
}
- pub fn for_addr(addr: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
+ pub fn for_ptr(ptr: Pointer, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
CPlace {
- inner: CPlaceInner::Addr(addr, None),
+ inner: CPlaceInner::Addr(ptr, None),
layout,
}
}
- pub fn for_addr_with_extra(addr: Value, extra: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
+ pub fn for_ptr_with_extra(ptr: Pointer, extra: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
CPlace {
- inner: CPlaceInner::Addr(addr, Some(extra)),
+ inner: CPlaceInner::Addr(ptr, Some(extra)),
layout,
}
}
pub fn to_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> CValue<'tcx> {
let layout = self.layout();
match self.inner {
- CPlaceInner::Var(var) => CValue::by_val(fx.bcx.use_var(mir_var(var)), layout),
- CPlaceInner::Addr(addr, extra) => {
+ CPlaceInner::Var(var) => {
+ let val = fx.bcx.use_var(mir_var(var));
+ fx.bcx.set_val_label(val, cranelift_codegen::ir::ValueLabel::from_u32(var.as_u32()));
+ CValue::by_val(val, layout)
+ }
+ CPlaceInner::Addr(ptr, extra) => {
assert!(extra.is_none(), "unsized values are not yet supported");
- CValue::by_ref(addr, layout)
+ CValue::by_ref(ptr, layout)
}
- CPlaceInner::Stack(stack_slot) => CValue::by_ref(
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- layout,
- ),
CPlaceInner::NoPlace => CValue::by_ref(
- fx.bcx
- .ins()
- .iconst(fx.pointer_type, fx.pointer_type.bytes() as i64),
+ Pointer::const_addr(fx, i64::try_from(self.layout.align.pref.bytes()).unwrap()),
layout,
),
}
}
- pub fn to_addr(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
- match self.to_addr_maybe_unsized(fx) {
- (addr, None) => addr,
+ pub fn to_ptr(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Pointer {
+ match self.to_ptr_maybe_unsized(fx) {
+ (ptr, None) => ptr,
(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
}
}
- pub fn to_addr_maybe_unsized(
+ pub fn to_ptr_maybe_unsized(
self,
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ) -> (Value, Option<Value>) {
+ ) -> (Pointer, Option<Value>) {
match self.inner {
- CPlaceInner::Addr(addr, extra) => (addr, extra),
- CPlaceInner::Stack(stack_slot) => (
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- None,
- ),
- CPlaceInner::NoPlace => (fx.bcx.ins().iconst(fx.pointer_type, 45), None),
+ CPlaceInner::Addr(ptr, extra) => (ptr, extra),
+ CPlaceInner::NoPlace => {
+ (
+ Pointer::const_addr(fx, i64::try_from(self.layout.align.pref.bytes()).unwrap()),
+ None,
+ )
+ }
CPlaceInner::Var(_) => bug!("Expected CPlace::Addr, found CPlace::Var"),
}
}
pub fn write_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, from: CValue<'tcx>) {
- use rustc::hir::Mutability::*;
+ #[cfg(debug_assertions)]
+ {
+ use cranelift_codegen::cursor::{Cursor, CursorPosition};
+ let cur_ebb = match fx.bcx.cursor().position() {
+ CursorPosition::After(ebb) => ebb,
+ _ => unreachable!(),
+ };
+ fx.add_comment(
+ fx.bcx.func.layout.last_inst(cur_ebb).unwrap(),
+ format!("write_cvalue: {:?} <- {:?}",self, from),
+ );
+ }
let from_ty = from.layout().ty;
let to_ty = self.layout().ty;
- fn assert_assignable<'tcx>(fx: &FunctionCx<'_, '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)) => {
+ fn assert_assignable<'tcx>(
+ fx: &FunctionCx<'_, 'tcx, impl Backend>,
+ from_ty: Ty<'tcx>,
+ to_ty: Ty<'tcx>,
+ ) {
+ match (&from_ty.kind, &to_ty.kind) {
+ (ty::Ref(_, t, Mutability::Not), ty::Ref(_, u, Mutability::Not))
+ | (ty::Ref(_, t, Mutability::Mut), ty::Ref(_, u, Mutability::Not))
+ | (ty::Ref(_, t, Mutability::Mut), ty::Ref(_, u, Mutability::Mut)) => {
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::Ref(_, _, Mutability::Not), ty::Ref(_, _, Mutability::Mut)) => 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(),
// 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,
- );
+ 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{:#?}",
assert_assignable(fx, from_ty, to_ty);
let dst_layout = self.layout();
- let addr = match self.inner {
+ let to_ptr = match self.inner {
CPlaceInner::Var(var) => {
let data = from.load_scalar(fx);
+ fx.bcx.set_val_label(data, cranelift_codegen::ir::ValueLabel::from_u32(var.as_u32()));
fx.bcx.def_var(mir_var(var), data);
return;
}
- CPlaceInner::Addr(addr, None) => addr,
- CPlaceInner::Stack(stack_slot) => {
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0)
- }
+ CPlaceInner::Addr(ptr, None) => ptr,
CPlaceInner::NoPlace => {
if dst_layout.abi != Abi::Uninhabited {
assert_eq!(dst_layout.size.bytes(), 0, "{:?}", dst_layout);
match from.0 {
CValueInner::ByVal(val) => {
- fx.bcx.ins().store(MemFlags::new(), val, addr, 0);
+ to_ptr.store(fx, val, MemFlags::new());
}
- 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(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);
+ to_ptr.store(fx, value, MemFlags::new());
+ to_ptr.offset(fx, b_offset).store(fx, extra, MemFlags::new());
}
- }
- CValueInner::ByRef(from_addr) => {
+ _ => bug!(
+ "Non ScalarPair abi {:?} for ByValPair CValue",
+ dst_layout.abi
+ ),
+ },
+ CValueInner::ByRef(from_ptr) => {
+ 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,
+ to_addr,
from_addr,
size,
dst_align,
field: mir::Field,
) -> CPlace<'tcx> {
let layout = self.layout();
- let (base, extra) = self.to_addr_maybe_unsized(fx);
+ let (base, extra) = self.to_ptr_maybe_unsized(fx);
- let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
+ let (field_ptr, field_layout) = codegen_field(fx, base, extra, layout, field);
if field_layout.is_unsized() {
- CPlace::for_addr_with_extra(field_ptr, extra.unwrap(), field_layout)
+ CPlace::for_ptr_with_extra(field_ptr, extra.unwrap(), field_layout)
} else {
- CPlace::for_addr(field_ptr, field_layout)
+ CPlace::for_ptr(field_ptr, field_layout)
}
}
fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
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(fx)),
+ ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_ptr_maybe_unsized(fx).0),
_ => bug!("place_index({:?})", self.layout().ty),
};
.ins()
.imul_imm(index, elem_layout.size.bytes() as i64);
- CPlace::for_addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
+ CPlace::for_ptr(ptr.offset_value(fx, offset), elem_layout)
}
pub 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 !inner_layout.is_unsized() {
- CPlace::for_addr(self.to_cvalue(fx).load_scalar(fx), inner_layout)
- } else {
+ if has_ptr_meta(fx.tcx, inner_layout.ty) {
let (addr, extra) = self.to_cvalue(fx).load_scalar_pair(fx);
- CPlace::for_addr_with_extra(addr, extra, inner_layout)
+ 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 fn write_place_ref(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
- if !self.layout().is_unsized() {
- let ptr = CValue::by_val(self.to_addr(fx), dest.layout());
+ if has_ptr_meta(fx.tcx, self.layout().ty) {
+ let (ptr, extra) = self.to_ptr_maybe_unsized(fx);
+ let ptr = CValue::by_val_pair(
+ ptr.get_addr(fx),
+ extra.expect("unsized type without metadata"),
+ dest.layout(),
+ );
dest.write_cvalue(fx, ptr);
} 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());
+ let ptr = CValue::by_val(self.to_ptr(fx).get_addr(fx), dest.layout());
dest.write_cvalue(fx, ptr);
}
}
projects / rust.git / blobdiff