3 use rustc_target::spec::{HasTargetSpec, Target};
5 use cranelift_module::{Module, FuncId, DataId};
9 pub type CurrentBackend = ::cranelift_simplejit::SimpleJITBackend;
11 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
12 pub struct Variable(Local);
14 impl EntityRef for Variable {
15 fn new(u: usize) -> Self {
16 Variable(Local::new(u))
19 fn index(self) -> usize {
24 pub fn cton_type_from_ty<'a, 'tcx: 'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>, ty: Ty<'tcx>) -> Option<types::Type> {
26 TypeVariants::TyBool => types::I8,
27 TypeVariants::TyUint(size) => {
29 UintTy::U8 => types::I8,
30 UintTy::U16 => types::I16,
31 UintTy::U32 => types::I32,
32 UintTy::U64 => types::I64,
33 UintTy::U128 => unimplemented!("u128"),
34 UintTy::Usize => types::I64,
37 TypeVariants::TyInt(size) => {
39 IntTy::I8 => types::I8,
40 IntTy::I16 => types::I16,
41 IntTy::I32 => types::I32,
42 IntTy::I64 => types::I64,
43 IntTy::I128 => unimplemented!("i128"),
44 IntTy::Isize => types::I64,
47 TypeVariants::TyChar => types::I32,
48 TypeVariants::TyFloat(size) => {
50 FloatTy::F32 => types::I32,
51 FloatTy::F64 => types::I64,
54 TypeVariants::TyFnPtr(_) => types::I64,
55 TypeVariants::TyRawPtr(TypeAndMut { ty, mutbl: _ }) | TypeVariants::TyRef(_, ty, _) => {
56 if ty.is_sized(tcx.at(DUMMY_SP), ParamEnv::reveal_all()) {
62 TypeVariants::TyParam(_) => bug!("{:?}: {:?}", ty, ty.sty),
67 fn codegen_field<'a, 'tcx: 'a>(
68 fx: &mut FunctionCx<'a, 'tcx>,
70 layout: TyLayout<'tcx>,
72 ) -> (Value, TyLayout<'tcx>) {
73 let field_offset = layout.fields.offset(field.index());
74 let field_ty = layout.field(&*fx, field.index());
75 if field_offset.bytes() > 0 {
76 let field_offset = fx.bcx.ins().iconst(types::I64, field_offset.bytes() as i64);
77 (fx.bcx.ins().iadd(base, field_offset), field_ty)
84 #[derive(Debug, Copy, Clone)]
85 pub enum CValue<'tcx> {
86 ByRef(Value, TyLayout<'tcx>),
87 ByVal(Value, TyLayout<'tcx>),
88 Func(FuncRef, TyLayout<'tcx>),
91 impl<'tcx> CValue<'tcx> {
92 pub fn layout(&self) -> TyLayout<'tcx> {
94 CValue::ByRef(_, layout) |
95 CValue::ByVal(_, layout) |
96 CValue::Func(_, layout) => layout
100 pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx>) -> Value where 'tcx: 'a {
102 CValue::ByRef(value, _layout) => value,
103 CValue::ByVal(value, layout) => {
104 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
105 kind: StackSlotKind::ExplicitSlot,
106 size: layout.size.bytes() as u32,
109 fx.bcx.ins().stack_store(value, stack_slot, 0);
110 fx.bcx.ins().stack_addr(types::I64, stack_slot, 0)
112 CValue::Func(func, ty) => {
113 let func = fx.bcx.ins().func_addr(types::I64, func);
114 CValue::ByVal(func, ty).force_stack(fx)
119 pub fn load_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx>) -> Value where 'tcx: 'a{
121 CValue::ByRef(addr, layout) => {
122 let cton_ty = fx.cton_type(layout.ty).expect(&format!("load_value of type {:?}", layout.ty));
123 fx.bcx.ins().load(cton_ty, MemFlags::new(), addr, 0)
125 CValue::ByVal(value, _layout) => value,
126 CValue::Func(func, _layout) => {
127 fx.bcx.ins().func_addr(types::I64, func)
132 pub fn expect_byref(self) -> (Value, TyLayout<'tcx>) {
134 CValue::ByRef(value, layout) => (value, layout),
135 CValue::ByVal(_, _) => bug!("Expected CValue::ByRef, found CValue::ByVal"),
136 CValue::Func(_, _) => bug!("Expected CValue::ByRef, found CValue::Func"),
140 pub fn value_field<'a>(self, fx: &mut FunctionCx<'a, 'tcx>, field: mir::Field) -> CValue<'tcx> where 'tcx: 'a {
141 let (base, layout) = match self {
142 CValue::ByRef(addr, layout) => (addr, layout),
143 _ => bug!("place_field for {:?}", self),
146 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
147 CValue::ByRef(field_ptr, field_layout)
150 pub fn const_val<'a>(fx: &mut FunctionCx<'a, 'tcx>, ty: Ty<'tcx>, const_val: i64) -> CValue<'tcx> where 'tcx: 'a {
151 let cton_ty = fx.cton_type(ty).unwrap();
152 let layout = fx.layout_of(ty);
153 CValue::ByVal(fx.bcx.ins().iconst(cton_ty, const_val), layout)
156 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
158 CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
159 CValue::ByVal(val, _) => CValue::ByVal(val, layout),
160 CValue::Func(fun, _) => CValue::Func(fun, layout),
165 /// A place where you can write a value to or read a value from
166 #[derive(Debug, Copy, Clone)]
167 pub enum CPlace<'tcx> {
168 Var(Variable, TyLayout<'tcx>),
169 Addr(Value, TyLayout<'tcx>),
172 impl<'a, 'tcx: 'a> CPlace<'tcx> {
173 pub fn layout(&self) -> TyLayout<'tcx> {
175 CPlace::Var(_, layout) |
176 CPlace::Addr(_, layout) => layout,
180 pub fn from_stack_slot(fx: &mut FunctionCx<'a, 'tcx>, stack_slot: StackSlot, ty: Ty<'tcx>) -> CPlace<'tcx> {
181 let layout = fx.layout_of(ty);
182 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
185 pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx>) -> CValue<'tcx> {
187 CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(var), layout),
188 CPlace::Addr(addr, layout) => CValue::ByRef(addr, layout),
192 pub fn expect_addr(self) -> Value {
194 CPlace::Addr(addr, _layout) => addr,
195 CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
199 pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx>, from: CValue<'tcx>) {
200 match (&self.layout().ty.sty, &from.layout().ty.sty) {
201 (TypeVariants::TyRef(_, t, dest_mut), TypeVariants::TyRef(_, u, src_mut)) if (
202 if *dest_mut != ::rustc::hir::Mutability::MutImmutable && src_mut != dest_mut {
210 // &mut T -> &T is allowed
211 // &'a T -> &'b T is allowed
215 self.layout().ty, from.layout().ty,
216 "Can't write value of incompatible type to place {:?} {:?}\n\n{:#?}",
217 self.layout().ty.sty, from.layout().ty.sty,
224 CPlace::Var(var, _) => {
225 let data = from.load_value(fx);
226 fx.bcx.def_var(var, data)
228 CPlace::Addr(addr, layout) => {
229 let size = layout.size.bytes() as i32;
231 if let Some(_) = fx.cton_type(layout.ty) {
232 let data = from.load_value(fx);
233 fx.bcx.ins().store(MemFlags::new(), data, addr, 0);
235 let from = from.expect_byref();
237 while size - offset >= 8 {
238 let byte = fx.bcx.ins().load(types::I64, MemFlags::new(), from.0, offset);
239 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
242 while size - offset >= 4 {
243 let byte = fx.bcx.ins().load(types::I32, MemFlags::new(), from.0, offset);
244 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
247 while offset < size {
248 let byte = fx.bcx.ins().load(types::I8, MemFlags::new(), from.0, offset);
249 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
257 pub fn place_field(self, fx: &mut FunctionCx<'a, 'tcx>, field: mir::Field) -> CPlace<'tcx> {
258 let base = self.expect_addr();
259 let layout = self.layout();
261 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
262 CPlace::Addr(field_ptr, field_layout)
265 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
267 CPlace::Var(var, _) => CPlace::Var(var, layout),
268 CPlace::Addr(addr, _) => CPlace::Addr(addr, layout),
272 pub fn downcast_variant(self, fx: &FunctionCx<'a, 'tcx>, variant: usize) -> Self {
273 let layout = self.layout().for_variant(fx, variant);
274 self.unchecked_cast_to(layout)
278 pub fn cton_intcast<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, val: Value, from: Ty<'tcx>, to: Ty<'tcx>, signed: bool) -> Value {
279 let from = fx.cton_type(from).unwrap();
280 let to = fx.cton_type(to).unwrap();
284 if to.wider_or_equal(from) {
286 fx.bcx.ins().sextend(to, val)
288 fx.bcx.ins().uextend(to, val)
291 fx.bcx.ins().ireduce(to, val)
295 pub struct FunctionCx<'a, 'tcx: 'a> {
296 pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
297 pub module: &'a mut Module<CurrentBackend>,
298 pub def_id_fn_id_map: &'a mut HashMap<Instance<'tcx>, FuncId>,
299 pub instance: Instance<'tcx>,
300 pub mir: &'tcx Mir<'tcx>,
301 pub param_substs: &'tcx Substs<'tcx>,
302 pub bcx: FunctionBuilder<'a, Variable>,
303 pub ebb_map: HashMap<BasicBlock, Ebb>,
304 pub local_map: HashMap<Local, CPlace<'tcx>>,
305 pub comments: HashMap<Inst, String>,
306 pub constants: &'a mut HashMap<AllocId, DataId>,
309 impl<'a, 'tcx: 'a> fmt::Debug for FunctionCx<'a, 'tcx> {
310 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
311 writeln!(f, "{:?}", self.def_id_fn_id_map)?;
312 writeln!(f, "{:?}", self.param_substs)?;
313 writeln!(f, "{:?}", self.local_map)?;
315 let mut clif = String::new();
316 let mut writer = crate::pretty_clif::CommentWriter(self.comments.clone());
317 ::cranelift::codegen::write::decorate_function(
323 writeln!(f, "\n{}", clif)
327 impl<'a, 'tcx: 'a> LayoutOf for &'a FunctionCx<'a, 'tcx> {
329 type TyLayout = TyLayout<'tcx>;
331 fn layout_of(self, ty: Ty<'tcx>) -> TyLayout<'tcx> {
332 let ty = self.monomorphize(&ty);
333 self.tcx.layout_of(ParamEnv::reveal_all().and(&ty)).unwrap()
337 impl<'a, 'tcx> layout::HasTyCtxt<'tcx> for &'a FunctionCx<'a, 'tcx> {
338 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
343 impl<'a, 'tcx> layout::HasDataLayout for &'a FunctionCx<'a, 'tcx> {
344 fn data_layout(&self) -> &layout::TargetDataLayout {
345 &self.tcx.data_layout
349 impl<'a, 'tcx> HasTargetSpec for &'a FunctionCx<'a, 'tcx> {
350 fn target_spec(&self) -> &Target {
351 &self.tcx.sess.target.target
355 impl<'a, 'tcx: 'a> FunctionCx<'a, 'tcx> {
356 pub fn monomorphize<T>(&self, value: &T) -> T
357 where T: TypeFoldable<'tcx>
359 self.tcx.subst_and_normalize_erasing_regions(
361 ty::ParamEnv::reveal_all(),
366 pub fn cton_type(&self, ty: Ty<'tcx>) -> Option<Type> {
367 cton_type_from_ty(self.tcx, self.monomorphize(&ty))
370 pub fn get_ebb(&self, bb: BasicBlock) -> Ebb {
371 *self.ebb_map.get(&bb).unwrap()
374 pub fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
375 *self.local_map.get(&local).unwrap()