3 use rustc_target::spec::{HasTargetSpec, Target};
5 use cranelift_module::Module;
9 pub fn mir_var(loc: Local) -> Variable {
10 Variable::with_u32(loc.index() as u32)
13 pub fn cton_type_from_ty<'a, 'tcx: 'a>(
14 tcx: TyCtxt<'a, 'tcx, 'tcx>,
16 ) -> Option<types::Type> {
18 TypeVariants::TyBool => types::I8,
19 TypeVariants::TyUint(size) => match size {
20 UintTy::U8 => types::I8,
21 UintTy::U16 => types::I16,
22 UintTy::U32 => types::I32,
23 UintTy::U64 => types::I64,
24 UintTy::U128 => unimpl!("u128"),
25 UintTy::Usize => types::I64,
27 TypeVariants::TyInt(size) => match size {
28 IntTy::I8 => types::I8,
29 IntTy::I16 => types::I16,
30 IntTy::I32 => types::I32,
31 IntTy::I64 => types::I64,
32 IntTy::I128 => unimpl!("i128"),
33 IntTy::Isize => types::I64,
35 TypeVariants::TyChar => types::I32,
36 TypeVariants::TyFloat(size) => match size {
37 FloatTy::F32 => types::F32,
38 FloatTy::F64 => types::F64,
40 TypeVariants::TyFnPtr(_) => types::I64,
41 TypeVariants::TyRawPtr(TypeAndMut { ty, mutbl: _ }) | TypeVariants::TyRef(_, ty, _) => {
42 if ty.is_sized(tcx.at(DUMMY_SP), ParamEnv::reveal_all()) {
48 TypeVariants::TyParam(_) => bug!("{:?}: {:?}", ty, ty.sty),
53 fn codegen_field<'a, 'tcx: 'a>(
54 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
56 layout: TyLayout<'tcx>,
58 ) -> (Value, TyLayout<'tcx>) {
59 let field_offset = layout.fields.offset(field.index());
60 let field_ty = layout.field(&*fx, field.index());
61 if field_offset.bytes() > 0 {
62 let field_offset = fx.bcx.ins().iconst(types::I64, field_offset.bytes() as i64);
63 (fx.bcx.ins().iadd(base, field_offset), field_ty)
70 #[derive(Debug, Copy, Clone)]
71 pub enum CValue<'tcx> {
72 ByRef(Value, TyLayout<'tcx>),
73 ByVal(Value, TyLayout<'tcx>),
76 impl<'tcx> CValue<'tcx> {
77 pub fn layout(&self) -> TyLayout<'tcx> {
79 CValue::ByRef(_, layout) | CValue::ByVal(_, layout) => layout,
83 pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
88 CValue::ByRef(value, _layout) => value,
89 CValue::ByVal(value, layout) => {
90 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
91 kind: StackSlotKind::ExplicitSlot,
92 size: layout.size.bytes() as u32,
95 fx.bcx.ins().stack_store(value, stack_slot, 0);
96 fx.bcx.ins().stack_addr(types::I64, stack_slot, 0)
101 pub fn load_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
106 CValue::ByRef(addr, layout) => {
108 .cton_type(layout.ty)
109 .expect(&format!("load_value of type {:?}", layout.ty));
110 fx.bcx.ins().load(cton_ty, MemFlags::new(), addr, 0)
112 CValue::ByVal(value, _layout) => value,
116 pub fn expect_byref(self) -> (Value, TyLayout<'tcx>) {
118 CValue::ByRef(value, layout) => (value, layout),
119 CValue::ByVal(_, _) => bug!("Expected CValue::ByRef, found CValue::ByVal: {:?}", self),
123 pub fn value_field<'a>(
125 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
131 let (base, layout) = match self {
132 CValue::ByRef(addr, layout) => (addr, layout),
133 _ => bug!("place_field for {:?}", self),
136 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
137 CValue::ByRef(field_ptr, field_layout)
140 pub fn const_val<'a>(
141 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
148 let cton_ty = fx.cton_type(ty).unwrap();
149 let layout = fx.layout_of(ty);
150 CValue::ByVal(fx.bcx.ins().iconst(cton_ty, const_val), layout)
153 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
155 CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
156 CValue::ByVal(val, _) => CValue::ByVal(val, layout),
161 /// A place where you can write a value to or read a value from
162 #[derive(Debug, Copy, Clone)]
163 pub enum CPlace<'tcx> {
164 Var(Local, TyLayout<'tcx>),
165 Addr(Value, TyLayout<'tcx>),
168 impl<'a, 'tcx: 'a> CPlace<'tcx> {
169 pub fn layout(&self) -> TyLayout<'tcx> {
171 CPlace::Var(_, layout) | CPlace::Addr(_, layout) => layout,
175 pub fn temp(fx: &mut FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> CPlace<'tcx> {
176 let layout = fx.layout_of(ty);
177 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
178 kind: StackSlotKind::ExplicitSlot,
179 size: layout.size.bytes() as u32,
182 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
185 pub fn from_stack_slot(
186 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
187 stack_slot: StackSlot,
190 let layout = fx.layout_of(ty);
191 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
194 pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
196 CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(mir_var(var)), layout),
197 CPlace::Addr(addr, layout) => CValue::ByRef(addr, layout),
201 pub fn expect_addr(self) -> Value {
203 CPlace::Addr(addr, _layout) => addr,
204 CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
208 pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
209 match (&self.layout().ty.sty, &from.layout().ty.sty) {
210 (TypeVariants::TyRef(_, t, dest_mut), TypeVariants::TyRef(_, u, src_mut))
211 if (if *dest_mut != ::rustc::hir::Mutability::MutImmutable && src_mut != dest_mut {
219 // &mut T -> &T is allowed
220 // &'a T -> &'b T is allowed
226 "Can't write value of incompatible type to place {:?} {:?}\n\n{:#?}",
227 self.layout().ty.sty,
228 from.layout().ty.sty,
235 CPlace::Var(var, _) => {
236 let data = from.load_value(fx);
237 fx.bcx.def_var(mir_var(var), data)
239 CPlace::Addr(addr, layout) => {
240 let size = layout.size.bytes() as i32;
242 if let Some(_) = fx.cton_type(layout.ty) {
243 let data = from.load_value(fx);
244 fx.bcx.ins().store(MemFlags::new(), data, addr, 0);
246 let from = from.expect_byref();
248 while size - offset >= 8 {
252 .load(types::I64, MemFlags::new(), from.0, offset);
253 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
256 while size - offset >= 4 {
260 .load(types::I32, MemFlags::new(), from.0, offset);
261 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
264 while offset < size {
268 .load(types::I8, MemFlags::new(), from.0, offset);
269 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
279 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
282 let base = self.expect_addr();
283 let layout = self.layout();
285 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
286 CPlace::Addr(field_ptr, field_layout)
291 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
294 let addr = self.expect_addr();
295 let layout = self.layout();
296 match layout.ty.sty {
297 TypeVariants::TyArray(elem_ty, _) => {
298 let elem_layout = fx.layout_of(elem_ty);
302 .iconst(types::I64, elem_layout.size.bytes() as i64);
303 let offset = fx.bcx.ins().imul(size, index);
304 CPlace::Addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
306 TypeVariants::TySlice(_elem_ty) => unimplemented!("place_index(TySlice)"),
307 _ => bug!("place_index({:?})", layout.ty),
311 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
313 CPlace::Var(var, _) => CPlace::Var(var, layout),
314 CPlace::Addr(addr, _) => CPlace::Addr(addr, layout),
318 pub fn downcast_variant(self, fx: &FunctionCx<'a, 'tcx, impl Backend>, variant: usize) -> Self {
319 let layout = self.layout().for_variant(fx, variant);
320 self.unchecked_cast_to(layout)
324 pub fn cton_intcast<'a, 'tcx: 'a>(
325 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
330 let from = fx.bcx.func.dfg.value_type(val);
334 if to.wider_or_equal(from) {
336 fx.bcx.ins().sextend(to, val)
338 fx.bcx.ins().uextend(to, val)
341 fx.bcx.ins().ireduce(to, val)
345 pub struct FunctionCx<'a, 'tcx: 'a, B: Backend + 'a> {
346 pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
347 pub module: &'a mut Module<B>,
348 pub instance: Instance<'tcx>,
349 pub mir: &'tcx Mir<'tcx>,
350 pub param_substs: &'tcx Substs<'tcx>,
351 pub bcx: FunctionBuilder<'a>,
352 pub ebb_map: HashMap<BasicBlock, Ebb>,
353 pub local_map: HashMap<Local, CPlace<'tcx>>,
354 pub comments: HashMap<Inst, String>,
355 pub constants: &'a mut crate::constant::ConstantCx,
357 /// add_global_comment inserts a comment here
358 pub top_nop: Option<Inst>,
361 impl<'a, 'tcx: 'a, B: Backend + 'a> fmt::Debug for FunctionCx<'a, 'tcx, B> {
362 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
363 writeln!(f, "{:?}", self.param_substs)?;
364 writeln!(f, "{:?}", self.local_map)?;
366 let mut clif = String::new();
367 let mut writer = crate::pretty_clif::CommentWriter(self.comments.clone());
368 ::cranelift::codegen::write::decorate_function(
374 writeln!(f, "\n{}", clif)
378 impl<'a, 'tcx: 'a, B: Backend> LayoutOf for &'a FunctionCx<'a, 'tcx, B> {
380 type TyLayout = TyLayout<'tcx>;
382 fn layout_of(self, ty: Ty<'tcx>) -> TyLayout<'tcx> {
383 let ty = self.monomorphize(&ty);
384 self.tcx.layout_of(ParamEnv::reveal_all().and(&ty)).unwrap()
388 impl<'a, 'tcx, B: Backend + 'a> layout::HasTyCtxt<'tcx> for &'a FunctionCx<'a, 'tcx, B> {
389 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
394 impl<'a, 'tcx, B: Backend + 'a> layout::HasDataLayout for &'a FunctionCx<'a, 'tcx, B> {
395 fn data_layout(&self) -> &layout::TargetDataLayout {
396 &self.tcx.data_layout
400 impl<'a, 'tcx, B: Backend + 'a> HasTargetSpec for &'a FunctionCx<'a, 'tcx, B> {
401 fn target_spec(&self) -> &Target {
402 &self.tcx.sess.target.target
406 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
407 pub fn monomorphize<T>(&self, value: &T) -> T
409 T: TypeFoldable<'tcx>,
411 self.tcx.subst_and_normalize_erasing_regions(
413 ty::ParamEnv::reveal_all(),
418 pub fn cton_type(&self, ty: Ty<'tcx>) -> Option<Type> {
419 cton_type_from_ty(self.tcx, self.monomorphize(&ty))
422 pub fn get_ebb(&self, bb: BasicBlock) -> Ebb {
423 *self.ebb_map.get(&bb).unwrap()
426 pub fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
427 *self.local_map.get(&local).unwrap()