3 use rustc_target::spec::{HasTargetSpec, Target};
5 use cranelift_module::Module;
9 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
10 pub struct Variable(pub Local);
12 impl EntityRef for Variable {
13 fn new(u: usize) -> Self {
14 Variable(Local::new(u))
17 fn index(self) -> usize {
22 pub fn cton_type_from_ty<'a, 'tcx: 'a>(
23 tcx: TyCtxt<'a, 'tcx, 'tcx>,
25 ) -> Option<types::Type> {
27 TypeVariants::TyBool => types::I8,
28 TypeVariants::TyUint(size) => match size {
29 UintTy::U8 => types::I8,
30 UintTy::U16 => types::I16,
31 UintTy::U32 => types::I32,
32 UintTy::U64 => types::I64,
33 UintTy::U128 => unimpl!("u128"),
34 UintTy::Usize => types::I64,
36 TypeVariants::TyInt(size) => match size {
37 IntTy::I8 => types::I8,
38 IntTy::I16 => types::I16,
39 IntTy::I32 => types::I32,
40 IntTy::I64 => types::I64,
41 IntTy::I128 => unimpl!("i128"),
42 IntTy::Isize => types::I64,
44 TypeVariants::TyChar => types::I32,
45 TypeVariants::TyFloat(size) => match size {
46 FloatTy::F32 => types::F32,
47 FloatTy::F64 => types::F64,
49 TypeVariants::TyFnPtr(_) => types::I64,
50 TypeVariants::TyRawPtr(TypeAndMut { ty, mutbl: _ }) | TypeVariants::TyRef(_, ty, _) => {
51 if ty.is_sized(tcx.at(DUMMY_SP), ParamEnv::reveal_all()) {
57 TypeVariants::TyParam(_) => bug!("{:?}: {:?}", ty, ty.sty),
62 fn codegen_field<'a, 'tcx: 'a>(
63 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
65 layout: TyLayout<'tcx>,
67 ) -> (Value, TyLayout<'tcx>) {
68 let field_offset = layout.fields.offset(field.index());
69 let field_ty = layout.field(&*fx, field.index());
70 if field_offset.bytes() > 0 {
71 let field_offset = fx.bcx.ins().iconst(types::I64, field_offset.bytes() as i64);
72 (fx.bcx.ins().iadd(base, field_offset), field_ty)
79 #[derive(Debug, Copy, Clone)]
80 pub enum CValue<'tcx> {
81 ByRef(Value, TyLayout<'tcx>),
82 ByVal(Value, TyLayout<'tcx>),
83 Func(FuncRef, TyLayout<'tcx>),
86 impl<'tcx> CValue<'tcx> {
87 pub fn layout(&self) -> TyLayout<'tcx> {
89 CValue::ByRef(_, layout) | CValue::ByVal(_, layout) | CValue::Func(_, layout) => layout,
93 pub fn force_stack<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
98 CValue::ByRef(value, _layout) => value,
99 CValue::ByVal(value, layout) => {
100 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
101 kind: StackSlotKind::ExplicitSlot,
102 size: layout.size.bytes() as u32,
105 fx.bcx.ins().stack_store(value, stack_slot, 0);
106 fx.bcx.ins().stack_addr(types::I64, stack_slot, 0)
108 CValue::Func(func, ty) => {
109 let func = fx.bcx.ins().func_addr(types::I64, func);
110 CValue::ByVal(func, ty).force_stack(fx)
115 pub fn load_value<'a>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value
120 CValue::ByRef(addr, layout) => {
122 .cton_type(layout.ty)
123 .expect(&format!("load_value of type {:?}", layout.ty));
124 fx.bcx.ins().load(cton_ty, MemFlags::new(), addr, 0)
126 CValue::ByVal(value, _layout) => value,
127 CValue::Func(func, _layout) => fx.bcx.ins().func_addr(types::I64, func),
131 pub fn expect_byref(self) -> (Value, TyLayout<'tcx>) {
133 CValue::ByRef(value, layout) => (value, layout),
134 CValue::ByVal(_, _) => bug!("Expected CValue::ByRef, found CValue::ByVal: {:?}", self),
135 CValue::Func(_, _) => bug!("Expected CValue::ByRef, found CValue::Func: {:?}", self),
139 pub fn value_field<'a>(
141 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
147 let (base, layout) = match self {
148 CValue::ByRef(addr, layout) => (addr, layout),
149 _ => bug!("place_field for {:?}", self),
152 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
153 CValue::ByRef(field_ptr, field_layout)
156 pub fn const_val<'a>(
157 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
164 let cton_ty = fx.cton_type(ty).unwrap();
165 let layout = fx.layout_of(ty);
166 CValue::ByVal(fx.bcx.ins().iconst(cton_ty, const_val), layout)
169 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
171 CValue::ByRef(addr, _) => CValue::ByRef(addr, layout),
172 CValue::ByVal(val, _) => CValue::ByVal(val, layout),
173 CValue::Func(fun, _) => CValue::Func(fun, layout),
178 /// A place where you can write a value to or read a value from
179 #[derive(Debug, Copy, Clone)]
180 pub enum CPlace<'tcx> {
181 Var(Variable, TyLayout<'tcx>),
182 Addr(Value, TyLayout<'tcx>),
185 impl<'a, 'tcx: 'a> CPlace<'tcx> {
186 pub fn layout(&self) -> TyLayout<'tcx> {
188 CPlace::Var(_, layout) | CPlace::Addr(_, layout) => layout,
192 pub fn temp(fx: &mut FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> CPlace<'tcx> {
193 let layout = fx.layout_of(ty);
194 let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
195 kind: StackSlotKind::ExplicitSlot,
196 size: layout.size.bytes() as u32,
199 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
202 pub fn from_stack_slot(
203 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
204 stack_slot: StackSlot,
207 let layout = fx.layout_of(ty);
208 CPlace::Addr(fx.bcx.ins().stack_addr(types::I64, stack_slot, 0), layout)
211 pub fn to_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> CValue<'tcx> {
213 CPlace::Var(var, layout) => CValue::ByVal(fx.bcx.use_var(var), layout),
214 CPlace::Addr(addr, layout) => CValue::ByRef(addr, layout),
218 pub fn expect_addr(self) -> Value {
220 CPlace::Addr(addr, _layout) => addr,
221 CPlace::Var(_, _) => bug!("Expected CPlace::Addr, found CPlace::Var"),
225 pub fn write_cvalue(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>, from: CValue<'tcx>) {
226 match (&self.layout().ty.sty, &from.layout().ty.sty) {
227 (TypeVariants::TyRef(_, t, dest_mut), TypeVariants::TyRef(_, u, src_mut))
228 if (if *dest_mut != ::rustc::hir::Mutability::MutImmutable && src_mut != dest_mut {
236 // &mut T -> &T is allowed
237 // &'a T -> &'b T is allowed
243 "Can't write value of incompatible type to place {:?} {:?}\n\n{:#?}",
244 self.layout().ty.sty,
245 from.layout().ty.sty,
252 CPlace::Var(var, _) => {
253 let data = from.load_value(fx);
254 fx.bcx.def_var(var, data)
256 CPlace::Addr(addr, layout) => {
257 let size = layout.size.bytes() as i32;
259 if let Some(_) = fx.cton_type(layout.ty) {
260 let data = from.load_value(fx);
261 fx.bcx.ins().store(MemFlags::new(), data, addr, 0);
263 let from = from.expect_byref();
265 while size - offset >= 8 {
269 .load(types::I64, MemFlags::new(), from.0, offset);
270 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
273 while size - offset >= 4 {
277 .load(types::I32, MemFlags::new(), from.0, offset);
278 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
281 while offset < size {
285 .load(types::I8, MemFlags::new(), from.0, offset);
286 fx.bcx.ins().store(MemFlags::new(), byte, addr, offset);
296 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
299 let base = self.expect_addr();
300 let layout = self.layout();
302 let (field_ptr, field_layout) = codegen_field(fx, base, layout, field);
303 CPlace::Addr(field_ptr, field_layout)
308 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
311 let addr = self.expect_addr();
312 let layout = self.layout();
313 match layout.ty.sty {
314 TypeVariants::TyArray(elem_ty, _) => {
315 let elem_layout = fx.layout_of(elem_ty);
319 .iconst(types::I64, elem_layout.size.bytes() as i64);
320 let offset = fx.bcx.ins().imul(size, index);
321 CPlace::Addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
323 TypeVariants::TySlice(_elem_ty) => unimplemented!("place_index(TySlice)"),
324 _ => bug!("place_index({:?})", layout.ty),
328 pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
330 CPlace::Var(var, _) => CPlace::Var(var, layout),
331 CPlace::Addr(addr, _) => CPlace::Addr(addr, layout),
335 pub fn downcast_variant(self, fx: &FunctionCx<'a, 'tcx, impl Backend>, variant: usize) -> Self {
336 let layout = self.layout().for_variant(fx, variant);
337 self.unchecked_cast_to(layout)
341 pub fn cton_intcast<'a, 'tcx: 'a>(
342 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
347 let from = fx.bcx.func.dfg.value_type(val);
351 if to.wider_or_equal(from) {
353 fx.bcx.ins().sextend(to, val)
355 fx.bcx.ins().uextend(to, val)
358 fx.bcx.ins().ireduce(to, val)
362 pub struct FunctionCx<'a, 'tcx: 'a, B: Backend + 'a> {
363 pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
364 pub module: &'a mut Module<B>,
365 pub instance: Instance<'tcx>,
366 pub mir: &'tcx Mir<'tcx>,
367 pub param_substs: &'tcx Substs<'tcx>,
368 pub bcx: FunctionBuilder<'a, Variable>,
369 pub ebb_map: HashMap<BasicBlock, Ebb>,
370 pub local_map: HashMap<Local, CPlace<'tcx>>,
371 pub comments: HashMap<Inst, String>,
372 pub constants: &'a mut crate::constant::ConstantCx,
375 impl<'a, 'tcx: 'a, B: Backend + 'a> fmt::Debug for FunctionCx<'a, 'tcx, B> {
376 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
377 writeln!(f, "{:?}", self.param_substs)?;
378 writeln!(f, "{:?}", self.local_map)?;
380 let mut clif = String::new();
381 let mut writer = crate::pretty_clif::CommentWriter(self.comments.clone());
382 ::cranelift::codegen::write::decorate_function(
388 writeln!(f, "\n{}", clif)
392 impl<'a, 'tcx: 'a, B: Backend> LayoutOf for &'a FunctionCx<'a, 'tcx, B> {
394 type TyLayout = TyLayout<'tcx>;
396 fn layout_of(self, ty: Ty<'tcx>) -> TyLayout<'tcx> {
397 let ty = self.monomorphize(&ty);
398 self.tcx.layout_of(ParamEnv::reveal_all().and(&ty)).unwrap()
402 impl<'a, 'tcx, B: Backend + 'a> layout::HasTyCtxt<'tcx> for &'a FunctionCx<'a, 'tcx, B> {
403 fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
408 impl<'a, 'tcx, B: Backend + 'a> layout::HasDataLayout for &'a FunctionCx<'a, 'tcx, B> {
409 fn data_layout(&self) -> &layout::TargetDataLayout {
410 &self.tcx.data_layout
414 impl<'a, 'tcx, B: Backend + 'a> HasTargetSpec for &'a FunctionCx<'a, 'tcx, B> {
415 fn target_spec(&self) -> &Target {
416 &self.tcx.sess.target.target
420 impl<'a, 'tcx: 'a, B: Backend + 'a> FunctionCx<'a, 'tcx, B> {
421 pub fn monomorphize<T>(&self, value: &T) -> T
423 T: TypeFoldable<'tcx>,
425 self.tcx.subst_and_normalize_erasing_regions(
427 ty::ParamEnv::reveal_all(),
432 pub fn cton_type(&self, ty: Ty<'tcx>) -> Option<Type> {
433 cton_type_from_ty(self.tcx, self.monomorphize(&ty))
436 pub fn get_ebb(&self, bb: BasicBlock) -> Ebb {
437 *self.ebb_map.get(&bb).unwrap()
440 pub fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
441 *self.local_map.get(&local).unwrap()