3 use rustc_target::spec::{HasTargetSpec, Target};
5 use cranelift_module::Module;
9 pub type CurrentBackend = ::cranelift_simplejit::SimpleJITBackend;
11 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
12 pub struct Variable(pub 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>(
25 tcx: TyCtxt<'a, 'tcx, 'tcx>,
27 ) -> Option<types::Type> {
29 TypeVariants::TyBool => types::I8,
30 TypeVariants::TyUint(size) => match size {
31 UintTy::U8 => types::I8,
32 UintTy::U16 => types::I16,
33 UintTy::U32 => types::I32,
34 UintTy::U64 => types::I64,
35 UintTy::U128 => unimpl!("u128"),
36 UintTy::Usize => types::I64,
38 TypeVariants::TyInt(size) => match size {
39 IntTy::I8 => types::I8,
40 IntTy::I16 => types::I16,
41 IntTy::I32 => types::I32,
42 IntTy::I64 => types::I64,
43 IntTy::I128 => unimpl!("i128"),
44 IntTy::Isize => types::I64,
46 TypeVariants::TyChar => types::I32,
47 TypeVariants::TyFloat(size) => match size {
48 FloatTy::F32 => types::F32,
49 FloatTy::F64 => types::F64,
51 TypeVariants::TyFnPtr(_) => types::I64,
52 TypeVariants::TyRawPtr(TypeAndMut { ty, mutbl: _ }) | TypeVariants::TyRef(_, ty, _) => {
53 if ty.is_sized(tcx.at(DUMMY_SP), ParamEnv::reveal_all()) {
59 TypeVariants::TyParam(_) => bug!("{:?}: {:?}", ty, ty.sty),
64 fn codegen_field<'a, 'tcx: 'a>(
65 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
67 layout: TyLayout<'tcx>,
69 ) -> (Value, TyLayout<'tcx>) {
70 let field_offset = layout.fields.offset(field.index());
71 let field_ty = layout.field(&*fx, field.index());
72 if field_offset.bytes() > 0 {
73 let field_offset = fx.bcx.ins().iconst(types::I64, field_offset.bytes() as i64);
74 (fx.bcx.ins().iadd(base, field_offset), field_ty)
81 #[derive(Debug, Copy, Clone)]
82 pub enum CValue<'tcx> {
83 ByRef(Value, TyLayout<'tcx>),
84 ByVal(Value, TyLayout<'tcx>),
85 Func(FuncRef, TyLayout<'tcx>),
88 impl<'tcx> CValue<'tcx> {
89 pub fn layout(&self) -> TyLayout<'tcx> {
91 CValue::ByRef(_, layout) | CValue::ByVal(_, layout) | CValue::Func(_, layout) => layout,
95 pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
100 CValue::ByRef(value, _layout) => value,
101 CValue::ByVal(value, layout) => {
102 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
103 kind: StackSlotKind::ExplicitSlot,
104 size: layout.size.bytes() as u32,
107 fx.bcx.ins().stack_store(value, stack_slot, 0);
108 fx.bcx.ins().stack_addr(types::I64, stack_slot, 0)
110 CValue::Func(func, ty) => {
111 let func = fx.bcx.ins().func_addr(types::I64, func);
112 CValue::ByVal(func, ty).force_stack(fx)
117 pub fn load_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
122 CValue::ByRef(addr, layout) => {
124 .cton_type(layout.ty)
125 .expect(&format!("load_value of type {:?}", layout.ty));
126 fx.bcx.ins().load(cton_ty, MemFlags::new(), addr, 0)
128 CValue::ByVal(value, _layout) => value,
129 CValue::Func(func, _layout) => fx.bcx.ins().func_addr(types::I64, func),
133 pub fn expect_byref(self) -> (Value, TyLayout<'tcx>) {
135 CValue::ByRef(value, layout) => (value, layout),
136 CValue::ByVal(_, _) => bug!("Expected CValue::ByRef, found CValue::ByVal: {:?}", self),
137 CValue::Func(_, _) => bug!("Expected CValue::ByRef, found CValue::Func: {:?}", self),
141 pub fn value_field<'a>(
143 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
149 let (base, layout) = match self {
150 CValue::ByRef(addr, layout) => (addr, layout),
151 _ => bug!("place_field for {:?}", self),
154 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
155 CValue::ByRef(field_ptr, field_layout)
158 pub fn const_val<'a>(
159 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
166 let cton_ty = fx.cton_type(ty).unwrap();
167 let layout = fx.layout_of(ty);
168 CValue::ByVal(fx.bcx.ins().iconst(cton_ty, const_val), layout)
171 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
173 CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
174 CValue::ByVal(val, _) => CValue::ByVal(val, layout),
175 CValue::Func(fun, _) => CValue::Func(fun, layout),
180 /// A place where you can write a value to or read a value from
181 #[derive(Debug, Copy, Clone)]
182 pub enum CPlace<'tcx> {
183 Var(Variable, TyLayout<'tcx>),
184 Addr(Value, TyLayout<'tcx>),
187 impl<'a, 'tcx: 'a> CPlace<'tcx> {
188 pub fn layout(&self) -> TyLayout<'tcx> {
190 CPlace::Var(_, layout) | CPlace::Addr(_, layout) => layout,
194 pub fn temp(fx: &mut FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> CPlace<'tcx> {
195 let layout = fx.layout_of(ty);
196 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
197 kind: StackSlotKind::ExplicitSlot,
198 size: layout.size.bytes() as u32,
201 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
204 pub fn from_stack_slot(
205 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
206 stack_slot: StackSlot,
209 let layout = fx.layout_of(ty);
210 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
213 pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
215 CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(var), layout),
216 CPlace::Addr(addr, layout) => CValue::ByRef(addr, layout),
220 pub fn expect_addr(self) -> Value {
222 CPlace::Addr(addr, _layout) => addr,
223 CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
227 pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
228 match (&self.layout().ty.sty, &from.layout().ty.sty) {
229 (TypeVariants::TyRef(_, t, dest_mut), TypeVariants::TyRef(_, u, src_mut))
230 if (if *dest_mut != ::rustc::hir::Mutability::MutImmutable && src_mut != dest_mut {
238 // &mut T -> &T is allowed
239 // &'a T -> &'b T is allowed
245 "Can't write value of incompatible type to place {:?} {:?}\n\n{:#?}",
246 self.layout().ty.sty,
247 from.layout().ty.sty,
254 CPlace::Var(var, _) => {
255 let data = from.load_value(fx);
256 fx.bcx.def_var(var, data)
258 CPlace::Addr(addr, layout) => {
259 let size = layout.size.bytes() as i32;
261 if let Some(_) = fx.cton_type(layout.ty) {
262 let data = from.load_value(fx);
263 fx.bcx.ins().store(MemFlags::new(), data, addr, 0);
265 let from = from.expect_byref();
267 while size - offset >= 8 {
271 .load(types::I64, MemFlags::new(), from.0, offset);
272 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
275 while size - offset >= 4 {
279 .load(types::I32, MemFlags::new(), from.0, offset);
280 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
283 while offset < size {
287 .load(types::I8, MemFlags::new(), from.0, offset);
288 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
298 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
301 let base = self.expect_addr();
302 let layout = self.layout();
304 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
305 CPlace::Addr(field_ptr, field_layout)
310 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
313 let addr = self.expect_addr();
314 let layout = self.layout();
315 match layout.ty.sty {
316 TypeVariants::TyArray(elem_ty, _) => {
317 let elem_layout = fx.layout_of(elem_ty);
321 .iconst(types::I64, elem_layout.size.bytes() as i64);
322 let offset = fx.bcx.ins().imul(size, index);
323 CPlace::Addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
325 TypeVariants::TySlice(_elem_ty) => unimplemented!("place_index(TySlice)"),
326 _ => bug!("place_index({:?})", layout.ty),
330 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
332 CPlace::Var(var, _) => CPlace::Var(var, layout),
333 CPlace::Addr(addr, _) => CPlace::Addr(addr, layout),
337 pub fn downcast_variant(self, fx: &FunctionCx<'a, 'tcx, impl Backend>, variant: usize) -> Self {
338 let layout = self.layout().for_variant(fx, variant);
339 self.unchecked_cast_to(layout)
343 pub fn cton_intcast<'a, 'tcx: 'a>(
344 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
349 let from = fx.bcx.func.dfg.value_type(val);
353 if to.wider_or_equal(from) {
355 fx.bcx.ins().sextend(to, val)
357 fx.bcx.ins().uextend(to, val)
360 fx.bcx.ins().ireduce(to, val)
364 pub struct FunctionCx<'a, 'tcx: 'a, B: Backend + 'a> {
365 pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
366 pub module: &'a mut Module<B>,
367 pub instance: Instance<'tcx>,
368 pub mir: &'tcx Mir<'tcx>,
369 pub param_substs: &'tcx Substs<'tcx>,
370 pub bcx: FunctionBuilder<'a, Variable>,
371 pub ebb_map: HashMap<BasicBlock, Ebb>,
372 pub local_map: HashMap<Local, CPlace<'tcx>>,
373 pub comments: HashMap<Inst, String>,
374 pub constants: &'a mut crate::constant::ConstantCx,
377 impl<'a, 'tcx: 'a, B: Backend + 'a> fmt::Debug for FunctionCx<'a, 'tcx, B> {
378 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
379 writeln!(f, "{:?}", self.param_substs)?;
380 writeln!(f, "{:?}", self.local_map)?;
382 let mut clif = String::new();
383 let mut writer = crate::pretty_clif::CommentWriter(self.comments.clone());
384 ::cranelift::codegen::write::decorate_function(
390 writeln!(f, "\n{}", clif)
394 impl<'a, 'tcx: 'a, B: Backend> LayoutOf for &'a FunctionCx<'a, 'tcx, B> {
396 type TyLayout = TyLayout<'tcx>;
398 fn layout_of(self, ty: Ty<'tcx>) -> TyLayout<'tcx> {
399 let ty = self.monomorphize(&ty);
400 self.tcx.layout_of(ParamEnv::reveal_all().and(&ty)).unwrap()
404 impl<'a, 'tcx, B: Backend + 'a> layout::HasTyCtxt<'tcx> for &'a FunctionCx<'a, 'tcx, B> {
405 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
410 impl<'a, 'tcx, B: Backend + 'a> layout::HasDataLayout for &'a FunctionCx<'a, 'tcx, B> {
411 fn data_layout(&self) -> &layout::TargetDataLayout {
412 &self.tcx.data_layout
416 impl<'a, 'tcx, B: Backend + 'a> HasTargetSpec for &'a FunctionCx<'a, 'tcx, B> {
417 fn target_spec(&self) -> &Target {
418 &self.tcx.sess.target.target
422 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
423 pub fn monomorphize<T>(&self, value: &T) -> T
425 T: TypeFoldable<'tcx>,
427 self.tcx.subst_and_normalize_erasing_regions(
429 ty::ParamEnv::reveal_all(),
434 pub fn cton_type(&self, ty: Ty<'tcx>) -> Option<Type> {
435 cton_type_from_ty(self.tcx, self.monomorphize(&ty))
438 pub fn get_ebb(&self, bb: BasicBlock) -> Ebb {
439 *self.ebb_map.get(&bb).unwrap()
442 pub fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
443 *self.local_map.get(&local).unwrap()