| use cranelift_codegen::isa::TargetFrontendConfig; |
| use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext}; |
| use rustc_index::IndexVec; |
| use rustc_middle::ty::layout::{ |
| self, FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, |
| }; |
| use rustc_middle::ty::TypeFoldable; |
| use rustc_span::source_map::Spanned; |
| use rustc_target::abi::call::FnAbi; |
| use rustc_target::abi::{Float, Integer, Primitive}; |
| use rustc_target::spec::{HasTargetSpec, Target}; |
| |
| use crate::constant::ConstantCx; |
| use crate::debuginfo::FunctionDebugContext; |
| use crate::prelude::*; |
| |
| pub(crate) fn pointer_ty(tcx: TyCtxt<'_>) -> types::Type { |
| match tcx.data_layout.pointer_size.bits() { |
| 16 => types::I16, |
| 32 => types::I32, |
| 64 => types::I64, |
| bits => bug!("ptr_sized_integer: unknown pointer bit size {}", bits), |
| } |
| } |
| |
| pub(crate) fn scalar_to_clif_type(tcx: TyCtxt<'_>, scalar: Scalar) -> Type { |
| match scalar.primitive() { |
| Primitive::Int(int, _sign) => match int { |
| Integer::I8 => types::I8, |
| Integer::I16 => types::I16, |
| Integer::I32 => types::I32, |
| Integer::I64 => types::I64, |
| Integer::I128 => types::I128, |
| }, |
| Primitive::Float(float) => match float { |
| Float::F16 => unimplemented!("f16_f128"), |
| Float::F32 => types::F32, |
| Float::F64 => types::F64, |
| Float::F128 => unimplemented!("f16_f128"), |
| }, |
| // FIXME(erikdesjardins): handle non-default addrspace ptr sizes |
| Primitive::Pointer(_) => pointer_ty(tcx), |
| } |
| } |
| |
| fn clif_type_from_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<types::Type> { |
| Some(match ty.kind() { |
| ty::Bool => types::I8, |
| ty::Uint(size) => match size { |
| UintTy::U8 => types::I8, |
| UintTy::U16 => types::I16, |
| UintTy::U32 => types::I32, |
| UintTy::U64 => types::I64, |
| UintTy::U128 => types::I128, |
| UintTy::Usize => pointer_ty(tcx), |
| }, |
| ty::Int(size) => match size { |
| IntTy::I8 => types::I8, |
| IntTy::I16 => types::I16, |
| IntTy::I32 => types::I32, |
| IntTy::I64 => types::I64, |
| IntTy::I128 => types::I128, |
| IntTy::Isize => pointer_ty(tcx), |
| }, |
| ty::Char => types::I32, |
| ty::Float(size) => match size { |
| FloatTy::F16 => unimplemented!("f16_f128"), |
| FloatTy::F32 => types::F32, |
| FloatTy::F64 => types::F64, |
| FloatTy::F128 => unimplemented!("f16_f128"), |
| }, |
| ty::FnPtr(_) => pointer_ty(tcx), |
| ty::RawPtr(pointee_ty, _) | ty::Ref(_, pointee_ty, _) => { |
| if has_ptr_meta(tcx, *pointee_ty) { |
| return None; |
| } else { |
| pointer_ty(tcx) |
| } |
| } |
| ty::Param(_) => bug!("ty param {:?}", ty), |
| _ => return None, |
| }) |
| } |
| |
| fn clif_pair_type_from_ty<'tcx>( |
| tcx: TyCtxt<'tcx>, |
| ty: Ty<'tcx>, |
| ) -> Option<(types::Type, types::Type)> { |
| Some(match ty.kind() { |
| ty::Tuple(types) if types.len() == 2 => { |
| (clif_type_from_ty(tcx, types[0])?, clif_type_from_ty(tcx, types[1])?) |
| } |
| ty::RawPtr(pointee_ty, _) | ty::Ref(_, pointee_ty, _) => { |
| if has_ptr_meta(tcx, *pointee_ty) { |
| (pointer_ty(tcx), pointer_ty(tcx)) |
| } else { |
| return None; |
| } |
| } |
| _ => return None, |
| }) |
| } |
| |
| /// Is a pointer to this type a fat ptr? |
| pub(crate) fn has_ptr_meta<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool { |
| if ty.is_sized(tcx, ParamEnv::reveal_all()) { |
| return false; |
| } |
| |
| let tail = tcx.struct_tail_erasing_lifetimes(ty, ParamEnv::reveal_all()); |
| match tail.kind() { |
| ty::Foreign(..) => false, |
| ty::Str | ty::Slice(..) | ty::Dynamic(..) => true, |
| _ => bug!("unexpected unsized tail: {:?}", tail), |
| } |
| } |
| |
| pub(crate) fn codegen_icmp_imm( |
| fx: &mut FunctionCx<'_, '_, '_>, |
| intcc: IntCC, |
| lhs: Value, |
| rhs: i128, |
| ) -> Value { |
| let lhs_ty = fx.bcx.func.dfg.value_type(lhs); |
| if lhs_ty == types::I128 { |
| // FIXME legalize `icmp_imm.i128` in Cranelift |
| |
| let (lhs_lsb, lhs_msb) = fx.bcx.ins().isplit(lhs); |
| let (rhs_lsb, rhs_msb) = (rhs as u128 as u64 as i64, (rhs as u128 >> 64) as u64 as i64); |
| |
| match intcc { |
| IntCC::Equal => { |
| let lsb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_lsb, rhs_lsb); |
| let msb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_msb, rhs_msb); |
| fx.bcx.ins().band(lsb_eq, msb_eq) |
| } |
| IntCC::NotEqual => { |
| let lsb_ne = fx.bcx.ins().icmp_imm(IntCC::NotEqual, lhs_lsb, rhs_lsb); |
| let msb_ne = fx.bcx.ins().icmp_imm(IntCC::NotEqual, lhs_msb, rhs_msb); |
| fx.bcx.ins().bor(lsb_ne, msb_ne) |
| } |
| _ => { |
| // if msb_eq { |
| // lsb_cc |
| // } else { |
| // msb_cc |
| // } |
| |
| let msb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_msb, rhs_msb); |
| let lsb_cc = fx.bcx.ins().icmp_imm(intcc, lhs_lsb, rhs_lsb); |
| let msb_cc = fx.bcx.ins().icmp_imm(intcc, lhs_msb, rhs_msb); |
| |
| fx.bcx.ins().select(msb_eq, lsb_cc, msb_cc) |
| } |
| } |
| } else { |
| let rhs = rhs as i64; // Truncates on purpose in case rhs is actually an unsigned value |
| fx.bcx.ins().icmp_imm(intcc, lhs, rhs) |
| } |
| } |
| |
| pub(crate) fn codegen_bitcast(fx: &mut FunctionCx<'_, '_, '_>, dst_ty: Type, val: Value) -> Value { |
| let mut flags = MemFlags::new(); |
| flags.set_endianness(match fx.tcx.data_layout.endian { |
| rustc_target::abi::Endian::Big => cranelift_codegen::ir::Endianness::Big, |
| rustc_target::abi::Endian::Little => cranelift_codegen::ir::Endianness::Little, |
| }); |
| fx.bcx.ins().bitcast(dst_ty, flags, val) |
| } |
| |
| pub(crate) fn type_zero_value(bcx: &mut FunctionBuilder<'_>, ty: Type) -> Value { |
| if ty == types::I128 { |
| let zero = bcx.ins().iconst(types::I64, 0); |
| bcx.ins().iconcat(zero, zero) |
| } else { |
| bcx.ins().iconst(ty, 0) |
| } |
| } |
| |
| pub(crate) fn type_min_max_value( |
| bcx: &mut FunctionBuilder<'_>, |
| ty: Type, |
| signed: bool, |
| ) -> (Value, Value) { |
| assert!(ty.is_int()); |
| |
| if ty == types::I128 { |
| if signed { |
| let min = i128::MIN as u128; |
| let min_lsb = bcx.ins().iconst(types::I64, min as u64 as i64); |
| let min_msb = bcx.ins().iconst(types::I64, (min >> 64) as u64 as i64); |
| let min = bcx.ins().iconcat(min_lsb, min_msb); |
| |
| let max = i128::MAX as u128; |
| let max_lsb = bcx.ins().iconst(types::I64, max as u64 as i64); |
| let max_msb = bcx.ins().iconst(types::I64, (max >> 64) as u64 as i64); |
| let max = bcx.ins().iconcat(max_lsb, max_msb); |
| |
| return (min, max); |
| } else { |
| let min_half = bcx.ins().iconst(types::I64, 0); |
| let min = bcx.ins().iconcat(min_half, min_half); |
| |
| let max_half = bcx.ins().iconst(types::I64, u64::MAX as i64); |
| let max = bcx.ins().iconcat(max_half, max_half); |
| |
| return (min, max); |
| } |
| } |
| |
| let min = match (ty, signed) { |
| (types::I8, false) | (types::I16, false) | (types::I32, false) | (types::I64, false) => { |
| 0i64 |
| } |
| (types::I8, true) => i64::from(i8::MIN as u8), |
| (types::I16, true) => i64::from(i16::MIN as u16), |
| (types::I32, true) => i64::from(i32::MIN as u32), |
| (types::I64, true) => i64::MIN, |
| _ => unreachable!(), |
| }; |
| |
| let max = match (ty, signed) { |
| (types::I8, false) => i64::from(u8::MAX), |
| (types::I16, false) => i64::from(u16::MAX), |
| (types::I32, false) => i64::from(u32::MAX), |
| (types::I64, false) => u64::MAX as i64, |
| (types::I8, true) => i64::from(i8::MAX as u8), |
| (types::I16, true) => i64::from(i16::MAX as u16), |
| (types::I32, true) => i64::from(i32::MAX as u32), |
| (types::I64, true) => i64::MAX, |
| _ => unreachable!(), |
| }; |
| |
| let (min, max) = (bcx.ins().iconst(ty, min), bcx.ins().iconst(ty, max)); |
| |
| (min, max) |
| } |
| |
| pub(crate) fn type_sign(ty: Ty<'_>) -> bool { |
| match ty.kind() { |
| ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..) | ty::Char | ty::Uint(..) | ty::Bool => false, |
| ty::Int(..) => true, |
| ty::Float(..) => false, // `signed` is unused for floats |
| _ => panic!("{}", ty), |
| } |
| } |
| |
| pub(crate) fn create_wrapper_function( |
| module: &mut dyn Module, |
| unwind_context: &mut UnwindContext, |
| sig: Signature, |
| wrapper_name: &str, |
| callee_name: &str, |
| ) { |
| let wrapper_func_id = module.declare_function(wrapper_name, Linkage::Export, &sig).unwrap(); |
| let callee_func_id = module.declare_function(callee_name, Linkage::Import, &sig).unwrap(); |
| |
| let mut ctx = Context::new(); |
| ctx.func.signature = sig; |
| { |
| let mut func_ctx = FunctionBuilderContext::new(); |
| let mut bcx = FunctionBuilder::new(&mut ctx.func, &mut func_ctx); |
| |
| let block = bcx.create_block(); |
| bcx.switch_to_block(block); |
| let func = &mut bcx.func.stencil; |
| let args = func |
| .signature |
| .params |
| .iter() |
| .map(|param| func.dfg.append_block_param(block, param.value_type)) |
| .collect::<Vec<Value>>(); |
| |
| let callee_func_ref = module.declare_func_in_func(callee_func_id, &mut bcx.func); |
| let call_inst = bcx.ins().call(callee_func_ref, &args); |
| let results = bcx.inst_results(call_inst).to_vec(); // Clone to prevent borrow error |
| |
| bcx.ins().return_(&results); |
| bcx.seal_all_blocks(); |
| bcx.finalize(); |
| } |
| module.define_function(wrapper_func_id, &mut ctx).unwrap(); |
| unwind_context.add_function(wrapper_func_id, &ctx, module.isa()); |
| } |
| |
| pub(crate) struct FunctionCx<'m, 'clif, 'tcx: 'm> { |
| pub(crate) cx: &'clif mut crate::CodegenCx, |
| pub(crate) module: &'m mut dyn Module, |
| pub(crate) tcx: TyCtxt<'tcx>, |
| pub(crate) target_config: TargetFrontendConfig, // Cached from module |
| pub(crate) pointer_type: Type, // Cached from module |
| pub(crate) constants_cx: ConstantCx, |
| pub(crate) func_debug_cx: Option<FunctionDebugContext>, |
| |
| pub(crate) instance: Instance<'tcx>, |
| pub(crate) symbol_name: String, |
| pub(crate) mir: &'tcx Body<'tcx>, |
| pub(crate) fn_abi: &'tcx FnAbi<'tcx, Ty<'tcx>>, |
| |
| pub(crate) bcx: FunctionBuilder<'clif>, |
| pub(crate) block_map: IndexVec<BasicBlock, Block>, |
| pub(crate) local_map: IndexVec<Local, CPlace<'tcx>>, |
| |
| /// When `#[track_caller]` is used, the implicit caller location is stored in this variable. |
| pub(crate) caller_location: Option<CValue<'tcx>>, |
| |
| pub(crate) clif_comments: crate::pretty_clif::CommentWriter, |
| |
| /// This should only be accessed by `CPlace::new_var`. |
| pub(crate) next_ssa_var: u32, |
| } |
| |
| impl<'tcx> LayoutOfHelpers<'tcx> for FunctionCx<'_, '_, 'tcx> { |
| type LayoutOfResult = TyAndLayout<'tcx>; |
| |
| #[inline] |
| fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! { |
| RevealAllLayoutCx(self.tcx).handle_layout_err(err, span, ty) |
| } |
| } |
| |
| impl<'tcx> FnAbiOfHelpers<'tcx> for FunctionCx<'_, '_, 'tcx> { |
| type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>; |
| |
| #[inline] |
| fn handle_fn_abi_err( |
| &self, |
| err: FnAbiError<'tcx>, |
| span: Span, |
| fn_abi_request: FnAbiRequest<'tcx>, |
| ) -> ! { |
| RevealAllLayoutCx(self.tcx).handle_fn_abi_err(err, span, fn_abi_request) |
| } |
| } |
| |
| impl<'tcx> layout::HasTyCtxt<'tcx> for FunctionCx<'_, '_, 'tcx> { |
| fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { |
| self.tcx |
| } |
| } |
| |
| impl<'tcx> rustc_target::abi::HasDataLayout for FunctionCx<'_, '_, 'tcx> { |
| fn data_layout(&self) -> &rustc_target::abi::TargetDataLayout { |
| &self.tcx.data_layout |
| } |
| } |
| |
| impl<'tcx> layout::HasParamEnv<'tcx> for FunctionCx<'_, '_, 'tcx> { |
| fn param_env(&self) -> ParamEnv<'tcx> { |
| ParamEnv::reveal_all() |
| } |
| } |
| |
| impl<'tcx> HasTargetSpec for FunctionCx<'_, '_, 'tcx> { |
| fn target_spec(&self) -> &Target { |
| &self.tcx.sess.target |
| } |
| } |
| |
| impl<'tcx> FunctionCx<'_, '_, 'tcx> { |
| pub(crate) fn monomorphize<T>(&self, value: T) -> T |
| where |
| T: TypeFoldable<TyCtxt<'tcx>> + Copy, |
| { |
| self.instance.instantiate_mir_and_normalize_erasing_regions( |
| self.tcx, |
| ty::ParamEnv::reveal_all(), |
| ty::EarlyBinder::bind(value), |
| ) |
| } |
| |
| pub(crate) fn clif_type(&self, ty: Ty<'tcx>) -> Option<Type> { |
| clif_type_from_ty(self.tcx, ty) |
| } |
| |
| pub(crate) fn clif_pair_type(&self, ty: Ty<'tcx>) -> Option<(Type, Type)> { |
| clif_pair_type_from_ty(self.tcx, ty) |
| } |
| |
| pub(crate) fn get_block(&self, bb: BasicBlock) -> Block { |
| *self.block_map.get(bb).unwrap() |
| } |
| |
| pub(crate) fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> { |
| *self.local_map.get(local).unwrap_or_else(|| { |
| panic!("Local {:?} doesn't exist", local); |
| }) |
| } |
| |
| pub(crate) fn create_stack_slot(&mut self, size: u32, align: u32) -> Pointer { |
| let abi_align = if self.tcx.sess.target.arch == "s390x" { 8 } else { 16 }; |
| if align <= abi_align { |
| let stack_slot = self.bcx.create_sized_stack_slot(StackSlotData { |
| kind: StackSlotKind::ExplicitSlot, |
| // FIXME Don't force the size to a multiple of <abi_align> bytes once Cranelift gets |
| // a way to specify stack slot alignment. |
| size: (size + abi_align - 1) / abi_align * abi_align, |
| }); |
| Pointer::stack_slot(stack_slot) |
| } else { |
| // Alignment is too big to handle using the above hack. Dynamically realign a stack slot |
| // instead. This wastes some space for the realignment. |
| let stack_slot = self.bcx.create_sized_stack_slot(StackSlotData { |
| kind: StackSlotKind::ExplicitSlot, |
| // FIXME Don't force the size to a multiple of <abi_align> bytes once Cranelift gets |
| // a way to specify stack slot alignment. |
| size: (size + align) / abi_align * abi_align, |
| }); |
| let base_ptr = self.bcx.ins().stack_addr(self.pointer_type, stack_slot, 0); |
| let misalign_offset = self.bcx.ins().urem_imm(base_ptr, i64::from(align)); |
| let realign_offset = self.bcx.ins().irsub_imm(misalign_offset, i64::from(align)); |
| Pointer::new(self.bcx.ins().iadd(base_ptr, realign_offset)) |
| } |
| } |
| |
| pub(crate) fn set_debug_loc(&mut self, source_info: mir::SourceInfo) { |
| if let Some(debug_context) = &mut self.cx.debug_context { |
| let (file_id, line, column) = |
| debug_context.get_span_loc(self.tcx, self.mir.span, source_info.span); |
| |
| let source_loc = |
| self.func_debug_cx.as_mut().unwrap().add_dbg_loc(file_id, line, column); |
| self.bcx.set_srcloc(source_loc); |
| } |
| } |
| |
| pub(crate) fn get_caller_location(&mut self, source_info: mir::SourceInfo) -> CValue<'tcx> { |
| self.mir.caller_location_span(source_info, self.caller_location, self.tcx, |span| { |
| let const_loc = self.tcx.span_as_caller_location(span); |
| crate::constant::codegen_const_value(self, const_loc, self.tcx.caller_location_ty()) |
| }) |
| } |
| |
| pub(crate) fn anonymous_str(&mut self, msg: &str) -> Value { |
| let mut data = DataDescription::new(); |
| data.define(msg.as_bytes().to_vec().into_boxed_slice()); |
| let msg_id = self.module.declare_anonymous_data(false, false).unwrap(); |
| |
| // Ignore DuplicateDefinition error, as the data will be the same |
| let _ = self.module.define_data(msg_id, &data); |
| |
| let local_msg_id = self.module.declare_data_in_func(msg_id, self.bcx.func); |
| if self.clif_comments.enabled() { |
| self.add_comment(local_msg_id, msg); |
| } |
| self.bcx.ins().global_value(self.pointer_type, local_msg_id) |
| } |
| } |
| |
| pub(crate) struct RevealAllLayoutCx<'tcx>(pub(crate) TyCtxt<'tcx>); |
| |
| impl<'tcx> LayoutOfHelpers<'tcx> for RevealAllLayoutCx<'tcx> { |
| type LayoutOfResult = TyAndLayout<'tcx>; |
| |
| #[inline] |
| fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! { |
| if let LayoutError::SizeOverflow(_) | LayoutError::ReferencesError(_) = err { |
| self.0.sess.dcx().span_fatal(span, err.to_string()) |
| } else { |
| self.0 |
| .sess |
| .dcx() |
| .span_fatal(span, format!("failed to get layout for `{}`: {}", ty, err)) |
| } |
| } |
| } |
| |
| impl<'tcx> FnAbiOfHelpers<'tcx> for RevealAllLayoutCx<'tcx> { |
| type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>; |
| |
| #[inline] |
| fn handle_fn_abi_err( |
| &self, |
| err: FnAbiError<'tcx>, |
| span: Span, |
| fn_abi_request: FnAbiRequest<'tcx>, |
| ) -> ! { |
| if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err { |
| self.0.sess.dcx().emit_fatal(Spanned { span, node: err }) |
| } else { |
| match fn_abi_request { |
| FnAbiRequest::OfFnPtr { sig, extra_args } => { |
| span_bug!(span, "`fn_abi_of_fn_ptr({sig}, {extra_args:?})` failed: {err:?}"); |
| } |
| FnAbiRequest::OfInstance { instance, extra_args } => { |
| span_bug!( |
| span, |
| "`fn_abi_of_instance({instance}, {extra_args:?})` failed: {err:?}" |
| ); |
| } |
| } |
| } |
| } |
| } |
| |
| impl<'tcx> layout::HasTyCtxt<'tcx> for RevealAllLayoutCx<'tcx> { |
| fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { |
| self.0 |
| } |
| } |
| |
| impl<'tcx> rustc_target::abi::HasDataLayout for RevealAllLayoutCx<'tcx> { |
| fn data_layout(&self) -> &rustc_target::abi::TargetDataLayout { |
| &self.0.data_layout |
| } |
| } |
| |
| impl<'tcx> layout::HasParamEnv<'tcx> for RevealAllLayoutCx<'tcx> { |
| fn param_env(&self) -> ParamEnv<'tcx> { |
| ParamEnv::reveal_all() |
| } |
| } |
| |
| impl<'tcx> HasTargetSpec for RevealAllLayoutCx<'tcx> { |
| fn target_spec(&self) -> &Target { |
| &self.0.sess.target |
| } |
| } |
