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https://github.com/rust-lang/rust.git
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Move CValue and CPlace to separate file and remove duplicate scalar_to_clif_type
This commit is contained in:
bjorn3
parent
d6e07cfcc8
commit
466ecad2f0
495
src/common.rs
495
src/common.rs
@ -17,16 +17,6 @@ pub fn pointer_ty(tcx: TyCtxt) -> types::Type {
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}
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}
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fn scalar_to_clif_type(tcx: TyCtxt, scalar: &Scalar) -> Type {
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match scalar.value.size(&tcx).bits() {
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8 => types::I8,
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16 => types::I16,
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32 => types::I32,
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64 => types::I64,
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size => bug!("Unsupported scalar size {}", size),
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}
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}
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pub fn clif_type_from_ty<'a, 'tcx: 'a>(
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tcx: TyCtxt<'a, 'tcx, 'tcx>,
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ty: Ty<'tcx>,
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@ -82,491 +72,6 @@ pub fn codegen_select(bcx: &mut FunctionBuilder, cond: Value, lhs: Value, rhs: V
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}
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}
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fn codegen_field<'a, 'tcx: 'a>(
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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base: Value,
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layout: TyLayout<'tcx>,
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field: mir::Field,
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) -> (Value, TyLayout<'tcx>) {
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let field_offset = layout.fields.offset(field.index());
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let field_ty = layout.field(&*fx, field.index());
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if field_offset.bytes() > 0 {
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(
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fx.bcx.ins().iadd_imm(base, field_offset.bytes() as i64),
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field_ty,
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)
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} else {
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(base, field_ty)
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}
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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 enum CValue<'tcx> {
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ByRef(Value, TyLayout<'tcx>),
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ByVal(Value, TyLayout<'tcx>),
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ByValPair(Value, Value, TyLayout<'tcx>),
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}
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impl<'tcx> CValue<'tcx> {
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pub fn by_ref(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
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CValue::ByRef(value, layout)
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}
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pub fn by_val(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
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CValue::ByVal(value, layout)
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}
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pub fn by_val_pair(value: Value, extra: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
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CValue::ByValPair(value, extra, layout)
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}
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pub fn layout(&self) -> TyLayout<'tcx> {
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match *self {
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CValue::ByRef(_, layout)
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| CValue::ByVal(_, layout)
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| CValue::ByValPair(_, _, layout) => layout,
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}
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}
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pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
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where
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'tcx: 'a,
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{
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match self {
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CValue::ByRef(value, _layout) => value,
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CValue::ByVal(value, layout) => {
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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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let addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
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fx.bcx.ins().store(MemFlags::new(), value, addr, 0);
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addr
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}
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CValue::ByValPair(value, extra, layout) => {
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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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let base = fx.bcx.ins().stack_addr(types::I64, stack_slot, 0);
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let a_addr = codegen_field(fx, base, layout, mir::Field::new(0)).0;
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let b_addr = codegen_field(fx, base, layout, mir::Field::new(1)).0;
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fx.bcx.ins().store(MemFlags::new(), value, a_addr, 0);
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fx.bcx.ins().store(MemFlags::new(), extra, b_addr, 0);
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base
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}
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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 fn load_scalar<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
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where
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'tcx: 'a,
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{
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match self {
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CValue::ByRef(addr, layout) => {
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let scalar = match layout.abi {
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layout::Abi::Scalar(ref scalar) => scalar.clone(),
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_ => unreachable!(),
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};
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let clif_ty = crate::abi::scalar_to_clif_type(fx.tcx, scalar);
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fx.bcx.ins().load(clif_ty, MemFlags::new(), addr, 0)
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}
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CValue::ByVal(value, _layout) => value,
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CValue::ByValPair(_, _, _layout) => 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 fn load_scalar_pair<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> (Value, Value)
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where
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'tcx: 'a,
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{
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match self {
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CValue::ByRef(addr, layout) => {
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let (a, b) = match &layout.abi {
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layout::Abi::ScalarPair(a, b) => (a.clone(), b.clone()),
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_ => unreachable!(),
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};
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let clif_ty1 = crate::abi::scalar_to_clif_type(fx.tcx, a.clone());
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let clif_ty2 = crate::abi::scalar_to_clif_type(fx.tcx, b);
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let val1 = fx.bcx.ins().load(clif_ty1, MemFlags::new(), addr, 0);
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let val2 = fx.bcx.ins().load(
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clif_ty2,
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MemFlags::new(),
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addr,
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a.value.size(&fx.tcx).bytes() as i32,
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);
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(val1, val2)
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}
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CValue::ByVal(_, _layout) => bug!("Please use load_scalar for ByVal"),
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CValue::ByValPair(val1, val2, _layout) => (val1, val2),
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}
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}
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pub fn value_field<'a>(
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self,
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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field: mir::Field,
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) -> CValue<'tcx>
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where
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'tcx: 'a,
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{
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let (base, layout) = match self {
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CValue::ByRef(addr, layout) => (addr, layout),
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_ => bug!("place_field for {:?}", self),
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};
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let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
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CValue::ByRef(field_ptr, field_layout)
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}
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pub fn unsize_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
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crate::unsize::coerce_unsized_into(fx, self, dest);
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}
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pub fn const_val<'a>(
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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ty: Ty<'tcx>,
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const_val: i64,
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) -> CValue<'tcx>
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where
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'tcx: 'a,
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{
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let clif_ty = fx.clif_type(ty).unwrap();
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let layout = fx.layout_of(ty);
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CValue::ByVal(fx.bcx.ins().iconst(clif_ty, const_val), layout)
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}
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pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
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match self {
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CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
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CValue::ByVal(val, _) => CValue::ByVal(val, layout),
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CValue::ByValPair(val, extra, _) => CValue::ByValPair(val, extra, layout),
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}
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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 enum CPlace<'tcx> {
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Var(Local, TyLayout<'tcx>),
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Addr(Value, Option<Value>, TyLayout<'tcx>),
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Stack(StackSlot, TyLayout<'tcx>),
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NoPlace(TyLayout<'tcx>),
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}
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impl<'a, 'tcx: 'a> CPlace<'tcx> {
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pub fn layout(&self) -> TyLayout<'tcx> {
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match *self {
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CPlace::Var(_, layout)
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| CPlace::Addr(_, _, layout)
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| CPlace::Stack(_, layout)
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| CPlace::NoPlace(layout) => layout,
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}
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}
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pub fn no_place(layout: TyLayout<'tcx>) -> CPlace<'tcx> {
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CPlace::NoPlace(layout)
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}
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pub fn new_stack_slot(
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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ty: Ty<'tcx>,
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) -> CPlace<'tcx> {
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let layout = fx.layout_of(ty);
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assert!(!layout.is_unsized());
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if layout.size.bytes() == 0 {
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return CPlace::NoPlace(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::Stack(stack_slot, layout)
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}
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pub fn new_var(
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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local: Local,
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layout: TyLayout<'tcx>,
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) -> CPlace<'tcx> {
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fx.bcx
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.declare_var(mir_var(local), fx.clif_type(layout.ty).unwrap());
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CPlace::Var(local, layout)
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}
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pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
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match self {
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CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(mir_var(var)), layout),
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CPlace::Addr(addr, extra, layout) => {
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assert!(extra.is_none(), "unsized values are not yet supported");
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CValue::ByRef(addr, layout)
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}
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CPlace::Stack(stack_slot, layout) => CValue::ByRef(
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fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
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layout,
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),
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CPlace::NoPlace(layout) => CValue::ByRef(
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fx.bcx
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.ins()
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.iconst(fx.pointer_type, fx.pointer_type.bytes() as i64),
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layout,
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),
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}
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}
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pub fn to_addr(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value {
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match self.to_addr_maybe_unsized(fx) {
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(addr, None) => addr,
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(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
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}
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}
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pub fn to_addr_maybe_unsized(
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self,
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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) -> (Value, Option<Value>) {
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match self {
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CPlace::Addr(addr, extra, _layout) => (addr, extra),
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CPlace::Stack(stack_slot, _layout) => (
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fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
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None,
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),
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CPlace::NoPlace(_) => (fx.bcx.ins().iconst(fx.pointer_type, 45), None),
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CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
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}
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}
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pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
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use rustc::hir::Mutability::*;
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let from_ty = from.layout().ty;
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let to_ty = self.layout().ty;
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fn assert_assignable<'a, 'tcx: 'a>(fx: &FunctionCx<'a, 'tcx, impl Backend>, from_ty: Ty<'tcx>, to_ty: Ty<'tcx>) {
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match (&from_ty.sty, &to_ty.sty) {
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(ty::Ref(_, t, MutImmutable), ty::Ref(_, u, MutImmutable))
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| (ty::Ref(_, t, MutMutable), ty::Ref(_, u, MutImmutable))
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| (ty::Ref(_, t, MutMutable), ty::Ref(_, u, MutMutable)) => {
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assert_assignable(fx, t, u);
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// &mut T -> &T is allowed
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// &'a T -> &'b T is allowed
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}
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(ty::Ref(_, _, MutImmutable), ty::Ref(_, _, MutMutable)) => {
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panic!("Cant assign value of type {} to place of type {}", from_ty, to_ty)
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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(),
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&from_ty.fn_sig(fx.tcx),
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);
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let to_sig = fx.tcx.normalize_erasing_late_bound_regions(
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ParamEnv::reveal_all(),
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&to_ty.fn_sig(fx.tcx),
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);
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assert_eq!(
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from_sig, to_sig,
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"Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
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from_sig, to_sig, fx,
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);
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// fn(&T) -> for<'l> fn(&'l T) is allowed
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}
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(ty::Dynamic(from_traits, _), ty::Dynamic(to_traits, _)) => {
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let from_traits = fx.tcx.normalize_erasing_late_bound_regions(
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ParamEnv::reveal_all(),
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from_traits,
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);
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let to_traits = fx.tcx.normalize_erasing_late_bound_regions(
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ParamEnv::reveal_all(),
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to_traits,
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);
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assert_eq!(
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from_traits, to_traits,
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"Can't write trait object of incompatible traits {:?} to place with traits {:?}\n\n{:#?}",
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from_traits, to_traits, fx,
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);
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// dyn for<'r> Trait<'r> -> dyn Trait<'_> is allowed
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}
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_ => {
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assert_eq!(
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from_ty,
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to_ty,
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"Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
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from_ty,
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to_ty,
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fx,
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);
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}
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}
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}
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assert_assignable(fx, from_ty, to_ty);
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let (addr, dst_layout) = match self {
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CPlace::Var(var, _) => {
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let data = from.load_scalar(fx);
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fx.bcx.def_var(mir_var(var), data);
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return;
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}
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CPlace::Addr(addr, None, dst_layout) => (addr, dst_layout),
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CPlace::Stack(stack_slot, dst_layout) => (
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fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
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dst_layout,
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),
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CPlace::NoPlace(layout) => {
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assert_eq!(layout.size.bytes(), 0);
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assert_eq!(from.layout().size.bytes(), 0);
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return;
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}
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CPlace::Addr(_, _, _) => bug!("Can't write value to unsized place {:?}", self),
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};
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match from {
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CValue::ByVal(val, _src_layout) => {
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fx.bcx.ins().store(MemFlags::new(), val, addr, 0);
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}
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CValue::ByValPair(val1, val2, _src_layout) => {
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let val1_offset = dst_layout.fields.offset(0).bytes() as i32;
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let val2_offset = dst_layout.fields.offset(1).bytes() as i32;
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fx.bcx.ins().store(MemFlags::new(), val1, addr, val1_offset);
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fx.bcx.ins().store(MemFlags::new(), val2, addr, val2_offset);
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}
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CValue::ByRef(from, src_layout) => {
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let size = dst_layout.size.bytes();
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let src_align = src_layout.align.abi.bytes() as u8;
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let dst_align = dst_layout.align.abi.bytes() as u8;
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fx.bcx.emit_small_memcpy(
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fx.module.target_config(),
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addr,
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from,
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size,
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dst_align,
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src_align,
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);
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}
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}
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}
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pub fn place_field(
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self,
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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field: mir::Field,
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) -> CPlace<'tcx> {
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let layout = self.layout();
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let (base, extra) = self.to_addr_maybe_unsized(fx);
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let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
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let extra = if field_layout.is_unsized() {
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assert!(extra.is_some());
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extra
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} else {
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None
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};
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CPlace::Addr(field_ptr, extra, field_layout)
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}
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pub fn place_index(
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self,
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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index: Value,
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) -> CPlace<'tcx> {
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let (elem_layout, addr) = match self.layout().ty.sty {
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ty::Array(elem_ty, _) => (fx.layout_of(elem_ty), self.to_addr(fx)),
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ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_addr_maybe_unsized(fx).0),
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_ => bug!("place_index({:?})", self.layout().ty),
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};
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let offset = fx
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.bcx
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.ins()
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.imul_imm(index, elem_layout.size.bytes() as i64);
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CPlace::Addr(fx.bcx.ins().iadd(addr, offset), None, elem_layout)
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}
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pub fn place_deref(self, fx: &mut FunctionCx<'a, '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::Addr(self.to_cvalue(fx).load_scalar(fx), None, inner_layout)
|
||||
} else {
|
||||
match self.layout().abi {
|
||||
Abi::ScalarPair(ref a, ref b) => {
|
||||
let addr = self.to_addr(fx);
|
||||
let ptr =
|
||||
fx.bcx
|
||||
.ins()
|
||||
.load(scalar_to_clif_type(fx.tcx, a), MemFlags::new(), addr, 0);
|
||||
let extra = fx.bcx.ins().load(
|
||||
scalar_to_clif_type(fx.tcx, b),
|
||||
MemFlags::new(),
|
||||
addr,
|
||||
a.value.size(&fx.tcx).bytes() as u32 as i32,
|
||||
);
|
||||
CPlace::Addr(ptr, Some(extra), inner_layout)
|
||||
}
|
||||
_ => bug!(
|
||||
"Fat ptr doesn't have abi ScalarPair, but it has {:?}",
|
||||
self.layout().abi
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn write_place_ref(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
|
||||
if !self.layout().is_unsized() {
|
||||
let ptr = CValue::ByVal(self.to_addr(fx), dest.layout());
|
||||
dest.write_cvalue(fx, ptr);
|
||||
} else {
|
||||
let (value, extra) = self.to_addr_maybe_unsized(fx);
|
||||
|
||||
match dest.layout().abi {
|
||||
Abi::ScalarPair(ref a, _) => {
|
||||
let dest_addr = dest.to_addr(fx);
|
||||
fx.bcx.ins().store(MemFlags::new(), value, dest_addr, 0);
|
||||
fx.bcx.ins().store(
|
||||
MemFlags::new(),
|
||||
extra.expect("unsized type without metadata"),
|
||||
dest_addr,
|
||||
a.value.size(&fx.tcx).bytes() as u32 as i32,
|
||||
);
|
||||
}
|
||||
_ => bug!(
|
||||
"Non ScalarPair abi {:?} in write_place_ref dest",
|
||||
dest.layout().abi
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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 fn downcast_variant(
|
||||
self,
|
||||
fx: &FunctionCx<'a, 'tcx, impl Backend>,
|
||||
variant: VariantIdx,
|
||||
) -> Self {
|
||||
let layout = self.layout().for_variant(fx, variant);
|
||||
self.unchecked_cast_to(layout)
|
||||
}
|
||||
}
|
||||
|
||||
pub fn clif_intcast<'a, 'tcx: 'a>(
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
val: Value,
|
||||
|
||||
@ -44,6 +44,7 @@ mod pretty_clif;
|
||||
mod trap;
|
||||
mod unimpl;
|
||||
mod unsize;
|
||||
mod value_and_place;
|
||||
mod vtable;
|
||||
|
||||
mod prelude {
|
||||
@ -93,6 +94,7 @@ mod prelude {
|
||||
pub use crate::debuginfo::{DebugContext, FunctionDebugContext};
|
||||
pub use crate::trap::*;
|
||||
pub use crate::unimpl::{unimpl, with_unimpl_span};
|
||||
pub use crate::value_and_place::{CValue, CPlace};
|
||||
pub use crate::{Caches, CodegenCx};
|
||||
|
||||
pub struct PrintOnPanic<F: Fn() -> String>(pub F);
|
||||
|
||||
486
src/value_and_place.rs
Normal file
486
src/value_and_place.rs
Normal file
@ -0,0 +1,486 @@
|
||||
use crate::prelude::*;
|
||||
|
||||
fn codegen_field<'a, 'tcx: 'a>(
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
base: Value,
|
||||
layout: TyLayout<'tcx>,
|
||||
field: mir::Field,
|
||||
) -> (Value, TyLayout<'tcx>) {
|
||||
let field_offset = layout.fields.offset(field.index());
|
||||
let field_ty = layout.field(&*fx, field.index());
|
||||
if field_offset.bytes() > 0 {
|
||||
(
|
||||
fx.bcx.ins().iadd_imm(base, field_offset.bytes() as i64),
|
||||
field_ty,
|
||||
)
|
||||
} else {
|
||||
(base, field_ty)
|
||||
}
|
||||
}
|
||||
|
||||
/// A read-only value
|
||||
#[derive(Debug, Copy, Clone)]
|
||||
pub enum CValue<'tcx> {
|
||||
ByRef(Value, TyLayout<'tcx>),
|
||||
ByVal(Value, TyLayout<'tcx>),
|
||||
ByValPair(Value, Value, TyLayout<'tcx>),
|
||||
}
|
||||
|
||||
impl<'tcx> CValue<'tcx> {
|
||||
pub fn by_ref(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
|
||||
CValue::ByRef(value, layout)
|
||||
}
|
||||
|
||||
pub fn by_val(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
|
||||
CValue::ByVal(value, layout)
|
||||
}
|
||||
|
||||
pub fn by_val_pair(value: Value, extra: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
|
||||
CValue::ByValPair(value, extra, layout)
|
||||
}
|
||||
|
||||
pub fn layout(&self) -> TyLayout<'tcx> {
|
||||
match *self {
|
||||
CValue::ByRef(_, layout)
|
||||
| CValue::ByVal(_, layout)
|
||||
| CValue::ByValPair(_, _, layout) => layout,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
|
||||
where
|
||||
'tcx: 'a,
|
||||
{
|
||||
match self {
|
||||
CValue::ByRef(value, _layout) => value,
|
||||
CValue::ByVal(value, layout) => {
|
||||
let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
|
||||
kind: StackSlotKind::ExplicitSlot,
|
||||
size: layout.size.bytes() as u32,
|
||||
offset: None,
|
||||
});
|
||||
let addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
|
||||
fx.bcx.ins().store(MemFlags::new(), value, addr, 0);
|
||||
addr
|
||||
}
|
||||
CValue::ByValPair(value, extra, layout) => {
|
||||
let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
|
||||
kind: StackSlotKind::ExplicitSlot,
|
||||
size: layout.size.bytes() as u32,
|
||||
offset: None,
|
||||
});
|
||||
let base = fx.bcx.ins().stack_addr(types::I64, stack_slot, 0);
|
||||
let a_addr = codegen_field(fx, base, layout, mir::Field::new(0)).0;
|
||||
let b_addr = codegen_field(fx, base, layout, mir::Field::new(1)).0;
|
||||
fx.bcx.ins().store(MemFlags::new(), value, a_addr, 0);
|
||||
fx.bcx.ins().store(MemFlags::new(), extra, b_addr, 0);
|
||||
base
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// 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,
|
||||
{
|
||||
match self {
|
||||
CValue::ByRef(addr, layout) => {
|
||||
let scalar = match layout.abi {
|
||||
layout::Abi::Scalar(ref scalar) => scalar.clone(),
|
||||
_ => unreachable!(),
|
||||
};
|
||||
let clif_ty = scalar_to_clif_type(fx.tcx, scalar);
|
||||
fx.bcx.ins().load(clif_ty, MemFlags::new(), addr, 0)
|
||||
}
|
||||
CValue::ByVal(value, _layout) => value,
|
||||
CValue::ByValPair(_, _, _layout) => 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,
|
||||
{
|
||||
match self {
|
||||
CValue::ByRef(addr, layout) => {
|
||||
let (a, b) = match &layout.abi {
|
||||
layout::Abi::ScalarPair(a, b) => (a.clone(), b.clone()),
|
||||
_ => unreachable!(),
|
||||
};
|
||||
let clif_ty1 = scalar_to_clif_type(fx.tcx, a.clone());
|
||||
let clif_ty2 = scalar_to_clif_type(fx.tcx, b);
|
||||
let val1 = fx.bcx.ins().load(clif_ty1, MemFlags::new(), addr, 0);
|
||||
let val2 = fx.bcx.ins().load(
|
||||
clif_ty2,
|
||||
MemFlags::new(),
|
||||
addr,
|
||||
a.value.size(&fx.tcx).bytes() as i32,
|
||||
);
|
||||
(val1, val2)
|
||||
}
|
||||
CValue::ByVal(_, _layout) => bug!("Please use load_scalar for ByVal"),
|
||||
CValue::ByValPair(val1, val2, _layout) => (val1, val2),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn value_field<'a>(
|
||||
self,
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
field: mir::Field,
|
||||
) -> CValue<'tcx>
|
||||
where
|
||||
'tcx: 'a,
|
||||
{
|
||||
let (base, layout) = match self {
|
||||
CValue::ByRef(addr, layout) => (addr, layout),
|
||||
_ => bug!("place_field for {:?}", self),
|
||||
};
|
||||
|
||||
let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
|
||||
CValue::ByRef(field_ptr, field_layout)
|
||||
}
|
||||
|
||||
pub fn unsize_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, 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::ByVal(fx.bcx.ins().iconst(clif_ty, const_val), layout)
|
||||
}
|
||||
|
||||
pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
|
||||
match self {
|
||||
CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
|
||||
CValue::ByVal(val, _) => CValue::ByVal(val, layout),
|
||||
CValue::ByValPair(val, extra, _) => CValue::ByValPair(val, extra, 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>),
|
||||
}
|
||||
|
||||
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,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn no_place(layout: TyLayout<'tcx>) -> CPlace<'tcx> {
|
||||
CPlace::NoPlace(layout)
|
||||
}
|
||||
|
||||
pub fn new_stack_slot(
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
ty: Ty<'tcx>,
|
||||
) -> CPlace<'tcx> {
|
||||
let layout = fx.layout_of(ty);
|
||||
assert!(!layout.is_unsized());
|
||||
if layout.size.bytes() == 0 {
|
||||
return CPlace::NoPlace(layout);
|
||||
}
|
||||
|
||||
let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
|
||||
kind: StackSlotKind::ExplicitSlot,
|
||||
size: layout.size.bytes() as u32,
|
||||
offset: None,
|
||||
});
|
||||
CPlace::Stack(stack_slot, layout)
|
||||
}
|
||||
|
||||
pub fn new_var(
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
local: Local,
|
||||
layout: TyLayout<'tcx>,
|
||||
) -> CPlace<'tcx> {
|
||||
fx.bcx
|
||||
.declare_var(mir_var(local), fx.clif_type(layout.ty).unwrap());
|
||||
CPlace::Var(local, layout)
|
||||
}
|
||||
|
||||
pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
|
||||
match self {
|
||||
CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(mir_var(var)), layout),
|
||||
CPlace::Addr(addr, extra, layout) => {
|
||||
assert!(extra.is_none(), "unsized values are not yet supported");
|
||||
CValue::ByRef(addr, layout)
|
||||
}
|
||||
CPlace::Stack(stack_slot, layout) => CValue::ByRef(
|
||||
fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
|
||||
layout,
|
||||
),
|
||||
CPlace::NoPlace(layout) => CValue::ByRef(
|
||||
fx.bcx
|
||||
.ins()
|
||||
.iconst(fx.pointer_type, fx.pointer_type.bytes() as i64),
|
||||
layout,
|
||||
),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn to_addr(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value {
|
||||
match self.to_addr_maybe_unsized(fx) {
|
||||
(addr, None) => addr,
|
||||
(_, 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 fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
|
||||
use rustc::hir::Mutability::*;
|
||||
|
||||
let from_ty = from.layout().ty;
|
||||
let to_ty = self.layout().ty;
|
||||
|
||||
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
|
||||
}
|
||||
_ => {
|
||||
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_ty, to_ty);
|
||||
|
||||
let (addr, dst_layout) = match self {
|
||||
CPlace::Var(var, _) => {
|
||||
let data = from.load_scalar(fx);
|
||||
fx.bcx.def_var(mir_var(var), data);
|
||||
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) => {
|
||||
assert_eq!(layout.size.bytes(), 0);
|
||||
assert_eq!(from.layout().size.bytes(), 0);
|
||||
return;
|
||||
}
|
||||
CPlace::Addr(_, _, _) => bug!("Can't write value to unsized place {:?}", self),
|
||||
};
|
||||
|
||||
match from {
|
||||
CValue::ByVal(val, _src_layout) => {
|
||||
fx.bcx.ins().store(MemFlags::new(), val, addr, 0);
|
||||
}
|
||||
CValue::ByValPair(val1, val2, _src_layout) => {
|
||||
let val1_offset = dst_layout.fields.offset(0).bytes() as i32;
|
||||
let val2_offset = dst_layout.fields.offset(1).bytes() as i32;
|
||||
fx.bcx.ins().store(MemFlags::new(), val1, addr, val1_offset);
|
||||
fx.bcx.ins().store(MemFlags::new(), val2, addr, val2_offset);
|
||||
}
|
||||
CValue::ByRef(from, src_layout) => {
|
||||
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,
|
||||
from,
|
||||
size,
|
||||
dst_align,
|
||||
src_align,
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn place_field(
|
||||
self,
|
||||
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
|
||||
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
|
||||
} else {
|
||||
None
|
||||
};
|
||||
CPlace::Addr(field_ptr, extra, field_layout)
|
||||
}
|
||||
|
||||
pub fn place_index(
|
||||
self,
|
||||
fx: &mut FunctionCx<'a, '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),
|
||||
_ => bug!("place_index({:?})", self.layout().ty),
|
||||
};
|
||||
|
||||
let offset = fx
|
||||
.bcx
|
||||
.ins()
|
||||
.imul_imm(index, elem_layout.size.bytes() as i64);
|
||||
|
||||
CPlace::Addr(fx.bcx.ins().iadd(addr, offset), None, elem_layout)
|
||||
}
|
||||
|
||||
pub fn place_deref(self, fx: &mut FunctionCx<'a, '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::Addr(self.to_cvalue(fx).load_scalar(fx), None, inner_layout)
|
||||
} else {
|
||||
match self.layout().abi {
|
||||
Abi::ScalarPair(ref a, ref b) => {
|
||||
let addr = self.to_addr(fx);
|
||||
let ptr =
|
||||
fx.bcx
|
||||
.ins()
|
||||
.load(scalar_to_clif_type(fx.tcx, a.clone()), MemFlags::new(), addr, 0);
|
||||
let extra = fx.bcx.ins().load(
|
||||
scalar_to_clif_type(fx.tcx, b.clone()),
|
||||
MemFlags::new(),
|
||||
addr,
|
||||
a.value.size(&fx.tcx).bytes() as u32 as i32,
|
||||
);
|
||||
CPlace::Addr(ptr, Some(extra), inner_layout)
|
||||
}
|
||||
_ => bug!(
|
||||
"Fat ptr doesn't have abi ScalarPair, but it has {:?}",
|
||||
self.layout().abi
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn write_place_ref(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
|
||||
if !self.layout().is_unsized() {
|
||||
let ptr = CValue::ByVal(self.to_addr(fx), dest.layout());
|
||||
dest.write_cvalue(fx, ptr);
|
||||
} else {
|
||||
let (value, extra) = self.to_addr_maybe_unsized(fx);
|
||||
|
||||
match dest.layout().abi {
|
||||
Abi::ScalarPair(ref a, _) => {
|
||||
let dest_addr = dest.to_addr(fx);
|
||||
fx.bcx.ins().store(MemFlags::new(), value, dest_addr, 0);
|
||||
fx.bcx.ins().store(
|
||||
MemFlags::new(),
|
||||
extra.expect("unsized type without metadata"),
|
||||
dest_addr,
|
||||
a.value.size(&fx.tcx).bytes() as u32 as i32,
|
||||
);
|
||||
}
|
||||
_ => bug!(
|
||||
"Non ScalarPair abi {:?} in write_place_ref dest",
|
||||
dest.layout().abi
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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 fn downcast_variant(
|
||||
self,
|
||||
fx: &FunctionCx<'a, 'tcx, impl Backend>,
|
||||
variant: VariantIdx,
|
||||
) -> Self {
|
||||
let layout = self.layout().for_variant(fx, variant);
|
||||
self.unchecked_cast_to(layout)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user