| use cranelift_codegen::isa::TargetFrontendConfig; |
| use gimli::write::FileId; |
| |
| use rustc_data_structures::sync::Lrc; |
| use rustc_index::IndexVec; |
| use rustc_middle::ty::layout::{ |
| FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, |
| }; |
| use rustc_span::SourceFile; |
| use rustc_target::abi::call::FnAbi; |
| use rustc_target::abi::{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::F32 => types::F32, |
| Primitive::F64 => types::F64, |
| // 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::F32 => types::F32, |
| FloatTy::F64 => types::F64, |
| }, |
| ty::FnPtr(_) => pointer_ty(tcx), |
| ty::RawPtr(TypeAndMut { ty: pointee_ty, mutbl: _ }) | 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(TypeAndMut { ty: pointee_ty, mutbl: _ }) | 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 { |
| let ptr_ty = tcx.mk_ptr(TypeAndMut { ty, mutbl: rustc_hir::Mutability::Not }); |
| match &tcx.layout_of(ParamEnv::reveal_all().and(ptr_ty)).unwrap().abi { |
| Abi::Scalar(_) => false, |
| Abi::ScalarPair(_, _) => true, |
| abi => unreachable!("Abi of ptr to {:?} is {:?}???", ty, abi), |
| } |
| } |
| |
| 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), |
| (types::I16, true) => i64::from(i16::MIN), |
| (types::I32, true) => i64::from(i32::MIN), |
| (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), |
| (types::I16, true) => i64::from(i16::MAX), |
| (types::I32, true) => i64::from(i32::MAX), |
| (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: Option<&'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, |
| |
| /// Last accessed source file and it's debuginfo file id. |
| /// |
| /// For optimization purposes only |
| pub(crate) last_source_file: Option<(Lrc<SourceFile>, FileId)>, |
| |
| /// 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.subst_mir_and_normalize_erasing_regions( |
| self.tcx, |
| ty::ParamEnv::reveal_all(), |
| ty::EarlyBinder::new(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 set_debug_loc(&mut self, source_info: mir::SourceInfo) { |
| if let Some(debug_context) = &mut self.cx.debug_context { |
| let (file, line, column) = |
| DebugContext::get_span_loc(self.tcx, self.mir.span, source_info.span); |
| |
| // add_source_file is very slow. |
| // Optimize for the common case of the current file not being changed. |
| let mut cached_file_id = None; |
| if let Some((ref last_source_file, last_file_id)) = self.last_source_file { |
| // If the allocations are not equal, the files may still be equal, but that |
| // doesn't matter, as this is just an optimization. |
| if rustc_data_structures::sync::Lrc::ptr_eq(last_source_file, &file) { |
| cached_file_id = Some(last_file_id); |
| } |
| } |
| |
| let file_id = if let Some(file_id) = cached_file_id { |
| file_id |
| } else { |
| debug_context.add_source_file(&file) |
| }; |
| |
| let source_loc = |
| self.func_debug_cx.as_mut().unwrap().add_dbg_loc(file_id, line, column); |
| self.bcx.set_srcloc(source_loc); |
| } |
| } |
| |
| // Note: must be kept in sync with get_caller_location from cg_ssa |
| pub(crate) fn get_caller_location(&mut self, mut source_info: mir::SourceInfo) -> CValue<'tcx> { |
| let span_to_caller_location = |fx: &mut FunctionCx<'_, '_, 'tcx>, span: Span| { |
| let topmost = span.ctxt().outer_expn().expansion_cause().unwrap_or(span); |
| let caller = fx.tcx.sess.source_map().lookup_char_pos(topmost.lo()); |
| let const_loc = fx.tcx.const_caller_location(( |
| rustc_span::symbol::Symbol::intern( |
| &caller.file.name.prefer_remapped().to_string_lossy(), |
| ), |
| caller.line as u32, |
| caller.col_display as u32 + 1, |
| )); |
| crate::constant::codegen_const_value(fx, const_loc, fx.tcx.caller_location_ty()) |
| }; |
| |
| // Walk up the `SourceScope`s, in case some of them are from MIR inlining. |
| // If so, the starting `source_info.span` is in the innermost inlined |
| // function, and will be replaced with outer callsite spans as long |
| // as the inlined functions were `#[track_caller]`. |
| loop { |
| let scope_data = &self.mir.source_scopes[source_info.scope]; |
| |
| if let Some((callee, callsite_span)) = scope_data.inlined { |
| // Stop inside the most nested non-`#[track_caller]` function, |
| // before ever reaching its caller (which is irrelevant). |
| if !callee.def.requires_caller_location(self.tcx) { |
| return span_to_caller_location(self, source_info.span); |
| } |
| source_info.span = callsite_span; |
| } |
| |
| // Skip past all of the parents with `inlined: None`. |
| match scope_data.inlined_parent_scope { |
| Some(parent) => source_info.scope = parent, |
| None => break, |
| } |
| } |
| |
| // No inlined `SourceScope`s, or all of them were `#[track_caller]`. |
| self.caller_location.unwrap_or_else(|| span_to_caller_location(self, source_info.span)) |
| } |
| |
| pub(crate) fn anonymous_str(&mut self, msg: &str) -> Value { |
| let mut data_ctx = DataContext::new(); |
| data_ctx.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_ctx); |
| |
| 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 layout::LayoutError::SizeOverflow(_) = err { |
| self.0.sess.span_fatal(span, err.to_string()) |
| } else { |
| span_bug!(span, "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.span_fatal(span, err.to_string()) |
| } else { |
| match fn_abi_request { |
| FnAbiRequest::OfFnPtr { sig, extra_args } => { |
| span_bug!( |
| span, |
| "`fn_abi_of_fn_ptr({}, {:?})` failed: {}", |
| sig, |
| extra_args, |
| err |
| ); |
| } |
| FnAbiRequest::OfInstance { instance, extra_args } => { |
| span_bug!( |
| span, |
| "`fn_abi_of_instance({}, {:?})` failed: {}", |
| instance, |
| extra_args, |
| 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 |
| } |
| } |
