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>),
74 Func(FuncRef, TyLayout<'tcx>),
77 impl<'tcx> CValue<'tcx> {
78 pub fn layout(&self) -> TyLayout<'tcx> {
80 CValue::ByRef(_, layout) | CValue::ByVal(_, layout) | CValue::Func(_, layout) => layout,
84 pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
89 CValue::ByRef(value, _layout) => value,
90 CValue::ByVal(value, layout) => {
91 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
92 kind: StackSlotKind::ExplicitSlot,
93 size: layout.size.bytes() as u32,
96 fx.bcx.ins().stack_store(value, stack_slot, 0);
97 fx.bcx.ins().stack_addr(types::I64, stack_slot, 0)
99 CValue::Func(func, ty) => {
100 let func = fx.bcx.ins().func_addr(types::I64, func);
101 CValue::ByVal(func, ty).force_stack(fx)
106 pub fn load_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
111 CValue::ByRef(addr, layout) => {
113 .cton_type(layout.ty)
114 .expect(&format!("load_value of type {:?}", layout.ty));
115 fx.bcx.ins().load(cton_ty, MemFlags::new(), addr, 0)
117 CValue::ByVal(value, _layout) => value,
118 CValue::Func(func, _layout) => fx.bcx.ins().func_addr(types::I64, func),
122 pub fn expect_byref(self) -> (Value, TyLayout<'tcx>) {
124 CValue::ByRef(value, layout) => (value, layout),
125 CValue::ByVal(_, _) => bug!("Expected CValue::ByRef, found CValue::ByVal: {:?}", self),
126 CValue::Func(_, _) => bug!("Expected CValue::ByRef, found CValue::Func: {:?}", self),
130 pub fn value_field<'a>(
132 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
138 let (base, layout) = match self {
139 CValue::ByRef(addr, layout) => (addr, layout),
140 _ => bug!("place_field for {:?}", self),
143 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
144 CValue::ByRef(field_ptr, field_layout)
147 pub fn const_val<'a>(
148 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
155 let cton_ty = fx.cton_type(ty).unwrap();
156 let layout = fx.layout_of(ty);
157 CValue::ByVal(fx.bcx.ins().iconst(cton_ty, const_val), layout)
160 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
162 CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
163 CValue::ByVal(val, _) => CValue::ByVal(val, layout),
164 CValue::Func(fun, _) => CValue::Func(fun, layout),
169 /// A place where you can write a value to or read a value from
170 #[derive(Debug, Copy, Clone)]
171 pub enum CPlace<'tcx> {
172 Var(Local, TyLayout<'tcx>),
173 Addr(Value, TyLayout<'tcx>),
176 impl<'a, 'tcx: 'a> CPlace<'tcx> {
177 pub fn layout(&self) -> TyLayout<'tcx> {
179 CPlace::Var(_, layout) | CPlace::Addr(_, layout) => layout,
183 pub fn temp(fx: &mut FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> CPlace<'tcx> {
184 let layout = fx.layout_of(ty);
185 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
186 kind: StackSlotKind::ExplicitSlot,
187 size: layout.size.bytes() as u32,
190 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
193 pub fn from_stack_slot(
194 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
195 stack_slot: StackSlot,
198 let layout = fx.layout_of(ty);
199 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
202 pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
204 CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(mir_var(var)), layout),
205 CPlace::Addr(addr, layout) => CValue::ByRef(addr, layout),
209 pub fn expect_addr(self) -> Value {
211 CPlace::Addr(addr, _layout) => addr,
212 CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
216 pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
217 match (&self.layout().ty.sty, &from.layout().ty.sty) {
218 (TypeVariants::TyRef(_, t, dest_mut), TypeVariants::TyRef(_, u, src_mut))
219 if (if *dest_mut != ::rustc::hir::Mutability::MutImmutable && src_mut != dest_mut {
227 // &mut T -> &T is allowed
228 // &'a T -> &'b T is allowed
234 "Can't write value of incompatible type to place {:?} {:?}\n\n{:#?}",
235 self.layout().ty.sty,
236 from.layout().ty.sty,
243 CPlace::Var(var, _) => {
244 let data = from.load_value(fx);
245 fx.bcx.def_var(mir_var(var), data)
247 CPlace::Addr(addr, layout) => {
248 let size = layout.size.bytes() as i32;
250 if let Some(_) = fx.cton_type(layout.ty) {
251 let data = from.load_value(fx);
252 fx.bcx.ins().store(MemFlags::new(), data, addr, 0);
254 let from = from.expect_byref();
256 while size - offset >= 8 {
260 .load(types::I64, MemFlags::new(), from.0, offset);
261 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
264 while size - offset >= 4 {
268 .load(types::I32, MemFlags::new(), from.0, offset);
269 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
272 while offset < size {
276 .load(types::I8, MemFlags::new(), from.0, offset);
277 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
287 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
290 let base = self.expect_addr();
291 let layout = self.layout();
293 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
294 CPlace::Addr(field_ptr, field_layout)
299 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
302 let addr = self.expect_addr();
303 let layout = self.layout();
304 match layout.ty.sty {
305 TypeVariants::TyArray(elem_ty, _) => {
306 let elem_layout = fx.layout_of(elem_ty);
310 .iconst(types::I64, elem_layout.size.bytes() as i64);
311 let offset = fx.bcx.ins().imul(size, index);
312 CPlace::Addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
314 TypeVariants::TySlice(_elem_ty) => unimplemented!("place_index(TySlice)"),
315 _ => bug!("place_index({:?})", layout.ty),
319 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
321 CPlace::Var(var, _) => CPlace::Var(var, layout),
322 CPlace::Addr(addr, _) => CPlace::Addr(addr, layout),
326 pub fn downcast_variant(self, fx: &FunctionCx<'a, 'tcx, impl Backend>, variant: usize) -> Self {
327 let layout = self.layout().for_variant(fx, variant);
328 self.unchecked_cast_to(layout)
332 pub fn cton_intcast<'a, 'tcx: 'a>(
333 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
338 let from = fx.bcx.func.dfg.value_type(val);
342 if to.wider_or_equal(from) {
344 fx.bcx.ins().sextend(to, val)
346 fx.bcx.ins().uextend(to, val)
349 fx.bcx.ins().ireduce(to, val)
353 pub struct FunctionCx<'a, 'tcx: 'a, B: Backend + 'a> {
354 pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
355 pub module: &'a mut Module<B>,
356 pub instance: Instance<'tcx>,
357 pub mir: &'tcx Mir<'tcx>,
358 pub param_substs: &'tcx Substs<'tcx>,
359 pub bcx: FunctionBuilder<'a>,
360 pub ebb_map: HashMap<BasicBlock, Ebb>,
361 pub local_map: HashMap<Local, CPlace<'tcx>>,
362 pub comments: HashMap<Inst, String>,
363 pub constants: &'a mut crate::constant::ConstantCx,
366 impl<'a, 'tcx: 'a, B: Backend + 'a> fmt::Debug for FunctionCx<'a, 'tcx, B> {
367 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
368 writeln!(f, "{:?}", self.param_substs)?;
369 writeln!(f, "{:?}", self.local_map)?;
371 let mut clif = String::new();
372 let mut writer = crate::pretty_clif::CommentWriter(self.comments.clone());
373 ::cranelift::codegen::write::decorate_function(
379 writeln!(f, "\n{}", clif)
383 impl<'a, 'tcx: 'a, B: Backend> LayoutOf for &'a FunctionCx<'a, 'tcx, B> {
385 type TyLayout = TyLayout<'tcx>;
387 fn layout_of(self, ty: Ty<'tcx>) -> TyLayout<'tcx> {
388 let ty = self.monomorphize(&ty);
389 self.tcx.layout_of(ParamEnv::reveal_all().and(&ty)).unwrap()
393 impl<'a, 'tcx, B: Backend + 'a> layout::HasTyCtxt<'tcx> for &'a FunctionCx<'a, 'tcx, B> {
394 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
399 impl<'a, 'tcx, B: Backend + 'a> layout::HasDataLayout for &'a FunctionCx<'a, 'tcx, B> {
400 fn data_layout(&self) -> &layout::TargetDataLayout {
401 &self.tcx.data_layout
405 impl<'a, 'tcx, B: Backend + 'a> HasTargetSpec for &'a FunctionCx<'a, 'tcx, B> {
406 fn target_spec(&self) -> &Target {
407 &self.tcx.sess.target.target
411 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
412 pub fn monomorphize<T>(&self, value: &T) -> T
414 T: TypeFoldable<'tcx>,
416 self.tcx.subst_and_normalize_erasing_regions(
418 ty::ParamEnv::reveal_all(),
423 pub fn cton_type(&self, ty: Ty<'tcx>) -> Option<Type> {
424 cton_type_from_ty(self.tcx, self.monomorphize(&ty))
427 pub fn get_ebb(&self, bb: BasicBlock) -> Ebb {
428 *self.ebb_map.get(&bb).unwrap()
431 pub fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
432 *self.local_map.get(&local).unwrap()