X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Fbase.rs;h=4842628a99da7d391cc6371617961290705180f2;hb=02e1fd48d183c9a28dc7f78b68fded919a1b9338;hp=0970b0d1695223d07e9fee2b05772ff335ae64c3;hpb=17f99b4a964a4ade86da447088c0a3fc2de43270;p=rust.git diff --git a/src/base.rs b/src/base.rs index 0970b0d1695..4842628a99d 100644 --- a/src/base.rs +++ b/src/base.rs @@ -1,152 +1,89 @@ -use rustc_middle::ty::adjustment::PointerCast; +//! Codegen of a single function + use rustc_index::vec::IndexVec; +use rustc_middle::ty::adjustment::PointerCast; +use rustc_middle::ty::layout::FnAbiExt; +use rustc_target::abi::call::FnAbi; use crate::prelude::*; -pub(crate) fn trans_fn<'clif, 'tcx, B: Backend + 'static>( - cx: &mut crate::CodegenCx<'clif, 'tcx, B>, +pub(crate) fn codegen_fn<'tcx>( + cx: &mut crate::CodegenCx<'tcx, impl Module>, instance: Instance<'tcx>, linkage: Linkage, ) { let tcx = cx.tcx; - let mir = *tcx.instance_mir(instance.def); + let _inst_guard = + crate::PrintOnPanic(|| format!("{:?} {}", instance, tcx.symbol_name(instance).name)); + debug_assert!(!instance.substs.needs_infer()); + + let mir = tcx.instance_mir(instance.def); // Declare function - let (name, sig) = get_function_name_and_sig(tcx, cx.module.isa().triple(), instance, false); + let name = tcx.symbol_name(instance).name.to_string(); + let sig = get_function_sig(tcx, cx.module.isa().triple(), instance); let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap(); - let mut debug_context = cx - .debug_context - .as_mut() - .map(|debug_context| FunctionDebugContext::new(debug_context, instance, func_id, &name)); - // Make FunctionBuilder - let context = &mut cx.cached_context; - context.clear(); - context.func.name = ExternalName::user(0, func_id.as_u32()); - context.func.signature = sig; - context.func.collect_debug_info(); + cx.cached_context.clear(); + + // Make the FunctionBuilder let mut func_ctx = FunctionBuilderContext::new(); - let mut bcx = FunctionBuilder::new(&mut context.func, &mut func_ctx); + let mut func = std::mem::replace(&mut cx.cached_context.func, Function::new()); + func.name = ExternalName::user(0, func_id.as_u32()); + func.signature = sig; + func.collect_debug_info(); - // Predefine block's + let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx); + + // Predefine blocks let start_block = bcx.create_block(); - let block_map: IndexVec = (0..mir.basic_blocks().len()).map(|_| bcx.create_block()).collect(); + let block_map: IndexVec = (0..mir.basic_blocks().len()) + .map(|_| bcx.create_block()) + .collect(); // Make FunctionCx let pointer_type = cx.module.target_config().pointer_type(); let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance); let mut fx = FunctionCx { + cx, tcx, - module: cx.module, pointer_type, instance, mir, + fn_abi: Some(FnAbi::of_instance(&RevealAllLayoutCx(tcx), instance, &[])), bcx, block_map, - local_map: HashMap::new(), + local_map: IndexVec::with_capacity(mir.local_decls.len()), caller_location: None, // set by `codegen_fn_prelude` cold_blocks: EntitySet::new(), clif_comments, - constants_cx: &mut cx.constants_cx, - vtables: &mut cx.vtables, source_info_set: indexmap::IndexSet::new(), + next_ssa_var: 0, + + inline_asm_index: 0, }; - let arg_uninhabited = fx.mir.args_iter().any(|arg| fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)).abi.is_uninhabited()); - let is_call_once_for_box = name.starts_with("_ZN83_$LT$alloc..boxed..Box$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once"); + let arg_uninhabited = fx.mir.args_iter().any(|arg| { + fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)) + .abi + .is_uninhabited() + }); if arg_uninhabited { - fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]); + fx.bcx + .append_block_params_for_function_params(fx.block_map[START_BLOCK]); fx.bcx.switch_to_block(fx.block_map[START_BLOCK]); crate::trap::trap_unreachable(&mut fx, "function has uninhabited argument"); - } else if is_call_once_for_box { - // HACK implement ` as FnOnce>::call_once` without `alloca`. - tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, false)); - fx.bcx.switch_to_block(fx.block_map[START_BLOCK]); - let bb_data = &fx.mir.basic_blocks()[START_BLOCK]; - let destination = match &bb_data.terminator().kind { - TerminatorKind::Call { - func, - args, - destination, - cleanup: _, - from_hir_call: _, - } => { - assert_eq!(args.len(), 2); - - let closure_arg = Local::new(1); - let closure_local = args[0].place().unwrap().as_local().unwrap(); - assert_eq!(fx.mir.local_decls[closure_local].ty, fx.mir.local_decls[closure_arg].ty.builtin_deref(true).unwrap().ty); - let closure_deref = fx.local_map[&closure_arg].place_deref(&mut fx); - fx.local_map.insert(closure_local, closure_deref); - - let args_arg = Local::new(2); - let args_local = args[1].place().unwrap().as_local().unwrap(); - assert_eq!(fx.mir.local_decls[args_local].ty, fx.mir.local_decls[args_arg].ty); - fx.local_map.insert(args_local, fx.local_map[&args_arg]); - - fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call( - &mut fx, - bb_data.terminator().source_info.span, - func, - args, - *destination, - )); - destination.map(|(_ret_place, ret_block)| ret_block) - } - _ => unreachable!(), - }; - - let destination = if let Some(destination) = destination { - fx.bcx.switch_to_block(fx.block_map[destination]); - let bb_data = &fx.mir.basic_blocks()[destination]; - match &bb_data.terminator().kind { - TerminatorKind::Call { - func, - args, - destination, - cleanup: _, - from_hir_call: _, - } => { - match destination { - Some((ret_place, _ret_block)) => { - fx.local_map.insert(ret_place.as_local().unwrap(), CPlace::no_place(fx.layout_of(fx.tcx.mk_unit()))); - } - None => {} - } - - assert_eq!(args.len(), 1); - fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call( - &mut fx, - bb_data.terminator().source_info.span, - func, - args, - *destination, - )); - destination.map(|(_ret_place, ret_block)| ret_block) - } - _ => unreachable!(), - } - } else { - None - }; - - if let Some(destination) = destination { - fx.bcx.switch_to_block(fx.block_map[destination]); - let bb_data = &fx.mir.basic_blocks()[destination]; - match &bb_data.terminator().kind { - TerminatorKind::Return => crate::abi::codegen_return(&mut fx), - _ => unreachable!(), - } - } } else { tcx.sess.time("codegen clif ir", || { - tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, true)); + tcx.sess.time("codegen prelude", || { + crate::abi::codegen_fn_prelude(&mut fx, start_block) + }); codegen_fn_content(&mut fx); }); } @@ -158,65 +95,105 @@ pub(crate) fn trans_fn<'clif, 'tcx, B: Backend + 'static>( let local_map = fx.local_map; let cold_blocks = fx.cold_blocks; - #[cfg(debug_assertions)] - crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &context.func, &clif_comments, None); + // Store function in context + let context = &mut cx.cached_context; + context.func = func; + + crate::pretty_clif::write_clif_file(tcx, "unopt", None, instance, &context, &clif_comments); // Verify function verify_func(tcx, &clif_comments, &context.func); // Perform rust specific optimizations tcx.sess.time("optimize clif ir", || { - crate::optimize::optimize_function(tcx, instance, context, &cold_blocks, &mut clif_comments); + crate::optimize::optimize_function( + tcx, + instance, + context, + &cold_blocks, + &mut clif_comments, + ); }); + // If the return block is not reachable, then the SSA builder may have inserted an `iconst.i128` + // instruction, which doesn't have an encoding. + context.compute_cfg(); + context.compute_domtree(); + context.eliminate_unreachable_code(cx.module.isa()).unwrap(); + context.dce(cx.module.isa()).unwrap(); + // Some Cranelift optimizations expect the domtree to not yet be computed and as such don't + // invalidate it when it would change. + context.domtree.clear(); + + context.want_disasm = crate::pretty_clif::should_write_ir(tcx); + // Define function let module = &mut cx.module; - tcx.sess.time( - "define function", - || module.define_function( - func_id, - context, - &mut cranelift_codegen::binemit::NullTrapSink {}, - ).unwrap(), - ); + tcx.sess.time("define function", || { + module + .define_function( + func_id, + context, + &mut cranelift_codegen::binemit::NullTrapSink {}, + ) + .unwrap() + }); // Write optimized function to file for debugging - #[cfg(debug_assertions)] - { - let value_ranges = context - .build_value_labels_ranges(cx.module.isa()) - .expect("value location ranges"); - - crate::pretty_clif::write_clif_file( - cx.tcx, - "opt", - instance, - &context.func, - &clif_comments, - Some(&value_ranges), - ); + crate::pretty_clif::write_clif_file( + tcx, + "opt", + Some(cx.module.isa()), + instance, + &context, + &clif_comments, + ); + + if let Some(mach_compile_result) = &context.mach_compile_result { + if let Some(disasm) = &mach_compile_result.disasm { + crate::pretty_clif::write_ir_file( + tcx, + &format!("{}.vcode", tcx.symbol_name(instance).name), + |file| file.write_all(disasm.as_bytes()), + ) + } } // Define debuginfo for function let isa = cx.module.isa(); + let debug_context = &mut cx.debug_context; + let unwind_context = &mut cx.unwind_context; tcx.sess.time("generate debug info", || { - debug_context - .as_mut() - .map(|x| x.define(context, isa, &source_info_set, local_map)); + if let Some(debug_context) = debug_context { + debug_context.define_function( + instance, + func_id, + &name, + isa, + context, + &source_info_set, + local_map, + ); + } + unwind_context.add_function(func_id, &context, isa); }); // Clear context to make it usable for the next function context.clear(); } -pub(crate) fn verify_func(tcx: TyCtxt, writer: &crate::pretty_clif::CommentWriter, func: &Function) { +pub(crate) fn verify_func( + tcx: TyCtxt<'_>, + writer: &crate::pretty_clif::CommentWriter, + func: &Function, +) { tcx.sess.time("verify clif ir", || { - let flags = settings::Flags::new(settings::builder()); - match ::cranelift_codegen::verify_function(&func, &flags) { + let flags = cranelift_codegen::settings::Flags::new(cranelift_codegen::settings::builder()); + match cranelift_codegen::verify_function(&func, &flags) { Ok(_) => {} Err(err) => { tcx.sess.err(&format!("{:?}", err)); - let pretty_error = ::cranelift_codegen::print_errors::pretty_verifier_error( + let pretty_error = cranelift_codegen::print_errors::pretty_verifier_error( &func, None, Some(Box::new(writer)), @@ -229,7 +206,9 @@ pub(crate) fn verify_func(tcx: TyCtxt, writer: &crate::pretty_clif::CommentWrite }); } -fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { +fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Module>) { + crate::constant::check_constants(fx); + for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() { let block = fx.get_block(bb); fx.bcx.switch_to_block(block); @@ -246,7 +225,7 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { fx.bcx.ins().nop(); for stmt in &bb_data.statements { fx.set_debug_loc(stmt.source_info); - trans_stmt(fx, block, stmt); + codegen_stmt(fx, block, stmt); } #[cfg(debug_assertions)] @@ -265,6 +244,23 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { match &bb_data.terminator().kind { TerminatorKind::Goto { target } => { + if let TerminatorKind::Return = fx.mir[*target].terminator().kind { + let mut can_immediately_return = true; + for stmt in &fx.mir[*target].statements { + if let StatementKind::StorageDead(_) = stmt.kind { + } else { + // FIXME Can sometimes happen, see rust-lang/rust#70531 + can_immediately_return = false; + break; + } + } + + if can_immediately_return { + crate::abi::codegen_return(fx); + continue; + } + } + let block = fx.get_block(*target); fx.bcx.ins().jump(block, &[]); } @@ -279,13 +275,13 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { cleanup: _, } => { if !fx.tcx.sess.overflow_checks() { - if let mir::AssertKind::OverflowNeg = *msg { + if let mir::AssertKind::OverflowNeg(_) = *msg { let target = fx.get_block(*target); fx.bcx.ins().jump(target, &[]); continue; } } - let cond = trans_operand(fx, cond).load_scalar(fx); + let cond = codegen_operand(fx, cond).load_scalar(fx); let target = fx.get_block(*target); let failure = fx.bcx.create_block(); @@ -299,45 +295,130 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { fx.bcx.ins().jump(target, &[]); fx.bcx.switch_to_block(failure); - trap_panic( - fx, - format!( - "[panic] Assert {:?} at {:?} failed.", - msg, - bb_data.terminator().source_info.span - ), - ); + fx.bcx.ins().nop(); + + match msg { + AssertKind::BoundsCheck { ref len, ref index } => { + let len = codegen_operand(fx, len).load_scalar(fx); + let index = codegen_operand(fx, index).load_scalar(fx); + let location = fx + .get_caller_location(bb_data.terminator().source_info.span) + .load_scalar(fx); + + codegen_panic_inner( + fx, + rustc_hir::LangItem::PanicBoundsCheck, + &[index, len, location], + bb_data.terminator().source_info.span, + ); + } + _ => { + let msg_str = msg.description(); + codegen_panic(fx, msg_str, bb_data.terminator().source_info.span); + } + } } TerminatorKind::SwitchInt { discr, - switch_ty: _, - values, + switch_ty, targets, } => { - let discr = trans_operand(fx, discr).load_scalar(fx); - let mut switch = ::cranelift_frontend::Switch::new(); - for (i, value) in values.iter().enumerate() { - let block = fx.get_block(targets[i]); - switch.set_entry(*value as u64, block); + let discr = codegen_operand(fx, discr).load_scalar(fx); + + let use_bool_opt = switch_ty.kind() == fx.tcx.types.bool.kind() + || (targets.iter().count() == 1 && targets.iter().next().unwrap().0 == 0); + if use_bool_opt { + assert_eq!(targets.iter().count(), 1); + let (then_value, then_block) = targets.iter().next().unwrap(); + let then_block = fx.get_block(then_block); + let else_block = fx.get_block(targets.otherwise()); + let test_zero = match then_value { + 0 => true, + 1 => false, + _ => unreachable!("{:?}", targets), + }; + + let discr = crate::optimize::peephole::maybe_unwrap_bint(&mut fx.bcx, discr); + let (discr, is_inverted) = + crate::optimize::peephole::maybe_unwrap_bool_not(&mut fx.bcx, discr); + let test_zero = if is_inverted { !test_zero } else { test_zero }; + let discr = crate::optimize::peephole::maybe_unwrap_bint(&mut fx.bcx, discr); + let discr = + crate::optimize::peephole::make_branchable_value(&mut fx.bcx, discr); + if let Some(taken) = crate::optimize::peephole::maybe_known_branch_taken( + &fx.bcx, discr, test_zero, + ) { + if taken { + fx.bcx.ins().jump(then_block, &[]); + } else { + fx.bcx.ins().jump(else_block, &[]); + } + } else { + if test_zero { + fx.bcx.ins().brz(discr, then_block, &[]); + fx.bcx.ins().jump(else_block, &[]); + } else { + fx.bcx.ins().brnz(discr, then_block, &[]); + fx.bcx.ins().jump(else_block, &[]); + } + } + } else { + let mut switch = ::cranelift_frontend::Switch::new(); + for (value, block) in targets.iter() { + let block = fx.get_block(block); + switch.set_entry(value, block); + } + let otherwise_block = fx.get_block(targets.otherwise()); + switch.emit(&mut fx.bcx, discr, otherwise_block); } - let otherwise_block = fx.get_block(targets[targets.len() - 1]); - switch.emit(&mut fx.bcx, discr, otherwise_block); } TerminatorKind::Call { func, args, destination, + fn_span, cleanup: _, from_hir_call: _, } => { - fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call( + fx.tcx.sess.time("codegen call", || { + crate::abi::codegen_terminator_call( + fx, + *fn_span, + block, + func, + args, + *destination, + ) + }); + } + TerminatorKind::InlineAsm { + template, + operands, + options, + destination, + line_spans: _, + } => { + crate::inline_asm::codegen_inline_asm( fx, bb_data.terminator().source_info.span, - func, - args, - *destination, - )); + template, + operands, + *options, + ); + + match *destination { + Some(destination) => { + let destination_block = fx.get_block(destination); + fx.bcx.ins().jump(destination_block, &[]); + } + None => { + crate::trap::trap_unreachable( + fx, + "[corruption] Returned from noreturn inline asm", + ); + } + } } TerminatorKind::Resume | TerminatorKind::Abort => { trap_unreachable(fx, "[corruption] Unwinding bb reached."); @@ -346,18 +427,18 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { trap_unreachable(fx, "[corruption] Hit unreachable code."); } TerminatorKind::Yield { .. } - | TerminatorKind::FalseEdges { .. } + | TerminatorKind::FalseEdge { .. } | TerminatorKind::FalseUnwind { .. } | TerminatorKind::DropAndReplace { .. } | TerminatorKind::GeneratorDrop => { - bug!("shouldn't exist at trans {:?}", bb_data.terminator()); + bug!("shouldn't exist at codegen {:?}", bb_data.terminator()); } TerminatorKind::Drop { - location, + place, target, unwind: _, } => { - let drop_place = trans_place(fx, *location); + let drop_place = codegen_place(fx, *place); crate::abi::codegen_drop(fx, bb_data.terminator().source_info.span, drop_place); let target_block = fx.get_block(*target); @@ -370,13 +451,12 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) { fx.bcx.finalize(); } -fn trans_stmt<'tcx>( - fx: &mut FunctionCx<'_, 'tcx, impl Backend>, - #[allow(unused_variables)] - cur_block: Block, +fn codegen_stmt<'tcx>( + fx: &mut FunctionCx<'_, 'tcx, impl Module>, + #[allow(unused_variables)] cur_block: Block, stmt: &Statement<'tcx>, ) { - let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt)); + let _print_guard = crate::PrintOnPanic(|| format!("stmt {:?}", stmt)); fx.set_debug_loc(stmt.source_info); @@ -394,85 +474,95 @@ fn trans_stmt<'tcx>( place, variant_index, } => { - let place = trans_place(fx, **place); + let place = codegen_place(fx, **place); crate::discriminant::codegen_set_discriminant(fx, place, *variant_index); } StatementKind::Assign(to_place_and_rval) => { - let lval = trans_place(fx, to_place_and_rval.0); + let lval = codegen_place(fx, to_place_and_rval.0); let dest_layout = lval.layout(); - match &to_place_and_rval.1 { - Rvalue::Use(operand) => { - let val = trans_operand(fx, operand); + match to_place_and_rval.1 { + Rvalue::Use(ref operand) => { + let val = codegen_operand(fx, operand); lval.write_cvalue(fx, val); } Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => { - let place = trans_place(fx, *place); - place.write_place_ref(fx, lval); + let place = codegen_place(fx, place); + let ref_ = place.place_ref(fx, lval.layout()); + lval.write_cvalue(fx, ref_); + } + Rvalue::ThreadLocalRef(def_id) => { + let val = crate::constant::codegen_tls_ref(fx, def_id, lval.layout()); + lval.write_cvalue(fx, val); } - Rvalue::BinaryOp(bin_op, lhs, rhs) => { - let lhs = trans_operand(fx, lhs); - let rhs = trans_operand(fx, rhs); + Rvalue::BinaryOp(bin_op, ref lhs, ref rhs) => { + let lhs = codegen_operand(fx, lhs); + let rhs = codegen_operand(fx, rhs); - let res = crate::num::codegen_binop(fx, *bin_op, lhs, rhs); + let res = crate::num::codegen_binop(fx, bin_op, lhs, rhs); lval.write_cvalue(fx, res); } - Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => { - let lhs = trans_operand(fx, lhs); - let rhs = trans_operand(fx, rhs); + Rvalue::CheckedBinaryOp(bin_op, ref lhs, ref rhs) => { + let lhs = codegen_operand(fx, lhs); + let rhs = codegen_operand(fx, rhs); let res = if !fx.tcx.sess.overflow_checks() { let val = - crate::num::trans_int_binop(fx, *bin_op, lhs, rhs).load_scalar(fx); + crate::num::codegen_int_binop(fx, bin_op, lhs, rhs).load_scalar(fx); let is_overflow = fx.bcx.ins().iconst(types::I8, 0); CValue::by_val_pair(val, is_overflow, lval.layout()) } else { - crate::num::trans_checked_int_binop(fx, *bin_op, lhs, rhs) + crate::num::codegen_checked_int_binop(fx, bin_op, lhs, rhs) }; lval.write_cvalue(fx, res); } - Rvalue::UnaryOp(un_op, operand) => { - let operand = trans_operand(fx, operand); + Rvalue::UnaryOp(un_op, ref operand) => { + let operand = codegen_operand(fx, operand); let layout = operand.layout(); let val = operand.load_scalar(fx); let res = match un_op { - UnOp::Not => { - match layout.ty.kind { - ty::Bool => { - let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0); - CValue::by_val(fx.bcx.ins().bint(types::I8, res), layout) - } - ty::Uint(_) | ty::Int(_) => { - CValue::by_val(fx.bcx.ins().bnot(val), layout) - } - _ => unreachable!("un op Not for {:?}", layout.ty), + UnOp::Not => match layout.ty.kind() { + ty::Bool => { + let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0); + CValue::by_val(fx.bcx.ins().bint(types::I8, res), layout) } - } - UnOp::Neg => match layout.ty.kind { + ty::Uint(_) | ty::Int(_) => { + CValue::by_val(fx.bcx.ins().bnot(val), layout) + } + _ => unreachable!("un op Not for {:?}", layout.ty), + }, + UnOp::Neg => match layout.ty.kind() { ty::Int(IntTy::I128) => { // FIXME remove this case once ineg.i128 works - let zero = CValue::const_val(fx, layout, 0); - crate::num::trans_int_binop(fx, BinOp::Sub, zero, operand) - } - ty::Int(_) => { - CValue::by_val(fx.bcx.ins().ineg(val), layout) - } - ty::Float(_) => { - CValue::by_val(fx.bcx.ins().fneg(val), layout) + let zero = + CValue::const_val(fx, layout, ty::ScalarInt::null(layout.size)); + crate::num::codegen_int_binop(fx, BinOp::Sub, zero, operand) } + ty::Int(_) => CValue::by_val(fx.bcx.ins().ineg(val), layout), + ty::Float(_) => CValue::by_val(fx.bcx.ins().fneg(val), layout), _ => unreachable!("un op Neg for {:?}", layout.ty), }, }; lval.write_cvalue(fx, res); } - Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, to_ty) => { - let from_ty = fx.monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx)); + Rvalue::Cast( + CastKind::Pointer(PointerCast::ReifyFnPointer), + ref operand, + to_ty, + ) => { + let from_ty = fx.monomorphize(operand.ty(&fx.mir.local_decls, fx.tcx)); let to_layout = fx.layout_of(fx.monomorphize(to_ty)); - match from_ty.kind { + match *from_ty.kind() { ty::FnDef(def_id, substs) => { let func_ref = fx.get_function_ref( - Instance::resolve_for_fn_ptr(fx.tcx, ParamEnv::reveal_all(), def_id, substs) - .unwrap(), + Instance::resolve_for_fn_ptr( + fx.tcx, + ParamEnv::reveal_all(), + def_id, + substs, + ) + .unwrap() + .polymorphize(fx.tcx), ); let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref); lval.write_cvalue(fx, CValue::by_val(func_addr, to_layout)); @@ -480,20 +570,32 @@ fn trans_stmt<'tcx>( _ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", from_ty), } } - Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, to_ty) - | Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, to_ty) - | Rvalue::Cast(CastKind::Pointer(PointerCast::ArrayToPointer), operand, to_ty) => { + Rvalue::Cast( + CastKind::Pointer(PointerCast::UnsafeFnPointer), + ref operand, + to_ty, + ) + | Rvalue::Cast( + CastKind::Pointer(PointerCast::MutToConstPointer), + ref operand, + to_ty, + ) + | Rvalue::Cast( + CastKind::Pointer(PointerCast::ArrayToPointer), + ref operand, + to_ty, + ) => { let to_layout = fx.layout_of(fx.monomorphize(to_ty)); - let operand = trans_operand(fx, operand); - lval.write_cvalue(fx, operand.unchecked_cast_to(to_layout)); + let operand = codegen_operand(fx, operand); + lval.write_cvalue(fx, operand.cast_pointer_to(to_layout)); } - Rvalue::Cast(CastKind::Misc, operand, to_ty) => { - let operand = trans_operand(fx, operand); + Rvalue::Cast(CastKind::Misc, ref operand, to_ty) => { + let operand = codegen_operand(fx, operand); let from_ty = operand.layout().ty; let to_ty = fx.monomorphize(to_ty); fn is_fat_ptr<'tcx>( - fx: &FunctionCx<'_, 'tcx, impl Backend>, + fx: &FunctionCx<'_, 'tcx, impl Module>, ty: Ty<'tcx>, ) -> bool { ty.builtin_deref(true) @@ -501,7 +603,9 @@ fn is_fat_ptr<'tcx>( |ty::TypeAndMut { ty: pointee_ty, mutbl: _, - }| has_ptr_meta(fx.tcx, pointee_ty), + }| { + has_ptr_meta(fx.tcx, pointee_ty) + }, ) .unwrap_or(false) } @@ -509,26 +613,63 @@ fn is_fat_ptr<'tcx>( if is_fat_ptr(fx, from_ty) { if is_fat_ptr(fx, to_ty) { // fat-ptr -> fat-ptr - lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout)); + lval.write_cvalue(fx, operand.cast_pointer_to(dest_layout)); } else { // fat-ptr -> thin-ptr let (ptr, _extra) = operand.load_scalar_pair(fx); lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout)) } - } else if let ty::Adt(adt_def, _substs) = from_ty.kind { + } else if let ty::Adt(adt_def, _substs) = from_ty.kind() { // enum -> discriminant value assert!(adt_def.is_enum()); - match to_ty.kind { + match to_ty.kind() { ty::Uint(_) | ty::Int(_) => {} _ => unreachable!("cast adt {} -> {}", from_ty, to_ty), } - let discr = crate::discriminant::codegen_get_discriminant( - fx, - operand, - fx.layout_of(to_ty), - ); - lval.write_cvalue(fx, discr); + use rustc_target::abi::{Int, TagEncoding, Variants}; + + match operand.layout().variants { + Variants::Single { index } => { + let discr = operand + .layout() + .ty + .discriminant_for_variant(fx.tcx, index) + .unwrap(); + let discr = if discr.ty.is_signed() { + fx.layout_of(discr.ty).size.sign_extend(discr.val) + } else { + discr.val + }; + let discr = discr.into(); + + let discr = CValue::const_val(fx, fx.layout_of(to_ty), discr); + lval.write_cvalue(fx, discr); + } + Variants::Multiple { + ref tag, + tag_field, + tag_encoding: TagEncoding::Direct, + variants: _, + } => { + let cast_to = fx.clif_type(dest_layout.ty).unwrap(); + + // Read the tag/niche-encoded discriminant from memory. + let encoded_discr = + operand.value_field(fx, mir::Field::new(tag_field)); + let encoded_discr = encoded_discr.load_scalar(fx); + + // Decode the discriminant (specifically if it's niche-encoded). + let signed = match tag.value { + Int(_, signed) => signed, + _ => false, + }; + let val = clif_intcast(fx, encoded_discr, cast_to, signed); + let val = CValue::by_val(val, dest_layout); + lval.write_cvalue(fx, val); + } + Variants::Multiple { .. } => unreachable!(), + } } else { let to_clif_ty = fx.clif_type(to_ty).unwrap(); let from = operand.load_scalar(fx); @@ -543,16 +684,21 @@ fn is_fat_ptr<'tcx>( lval.write_cvalue(fx, CValue::by_val(res, dest_layout)); } } - Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _to_ty) => { - let operand = trans_operand(fx, operand); - match operand.layout().ty.kind { + Rvalue::Cast( + CastKind::Pointer(PointerCast::ClosureFnPointer(_)), + ref operand, + _to_ty, + ) => { + let operand = codegen_operand(fx, operand); + match *operand.layout().ty.kind() { ty::Closure(def_id, substs) => { let instance = Instance::resolve_closure( fx.tcx, def_id, substs, ty::ClosureKind::FnOnce, - ); + ) + .polymorphize(fx.tcx); let func_ref = fx.get_function_ref(instance); let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref); lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout())); @@ -560,40 +706,62 @@ fn is_fat_ptr<'tcx>( _ => bug!("{} cannot be cast to a fn ptr", operand.layout().ty), } } - Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _to_ty) => { - let operand = trans_operand(fx, operand); + Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), ref operand, _to_ty) => { + let operand = codegen_operand(fx, operand); operand.unsize_value(fx, lval); } Rvalue::Discriminant(place) => { - let place = trans_place(fx, *place); + let place = codegen_place(fx, place); let value = place.to_cvalue(fx); let discr = crate::discriminant::codegen_get_discriminant(fx, value, dest_layout); lval.write_cvalue(fx, discr); } - Rvalue::Repeat(operand, times) => { - let operand = trans_operand(fx, operand); + Rvalue::Repeat(ref operand, times) => { + let operand = codegen_operand(fx, operand); let times = fx .monomorphize(times) .eval(fx.tcx, ParamEnv::reveal_all()) .val .try_to_bits(fx.tcx.data_layout.pointer_size) .unwrap(); - for i in 0..times { - let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64); + if fx.clif_type(operand.layout().ty) == Some(types::I8) { + let times = fx.bcx.ins().iconst(fx.pointer_type, times as i64); + // FIXME use emit_small_memset where possible + let addr = lval.to_ptr().get_addr(fx); + let val = operand.load_scalar(fx); + fx.bcx + .call_memset(fx.cx.module.target_config(), addr, val, times); + } else { + let loop_block = fx.bcx.create_block(); + let loop_block2 = fx.bcx.create_block(); + let done_block = fx.bcx.create_block(); + let index = fx.bcx.append_block_param(loop_block, fx.pointer_type); + let zero = fx.bcx.ins().iconst(fx.pointer_type, 0); + fx.bcx.ins().jump(loop_block, &[zero]); + + fx.bcx.switch_to_block(loop_block); + let done = fx.bcx.ins().icmp_imm(IntCC::Equal, index, times as i64); + fx.bcx.ins().brnz(done, done_block, &[]); + fx.bcx.ins().jump(loop_block2, &[]); + + fx.bcx.switch_to_block(loop_block2); let to = lval.place_index(fx, index); to.write_cvalue(fx, operand); + let index = fx.bcx.ins().iadd_imm(index, 1); + fx.bcx.ins().jump(loop_block, &[index]); + + fx.bcx.switch_to_block(done_block); + fx.bcx.ins().nop(); } } Rvalue::Len(place) => { - let place = trans_place(fx, *place); + let place = codegen_place(fx, place); let usize_layout = fx.layout_of(fx.tcx.types.usize); let len = codegen_array_len(fx, place); lval.write_cvalue(fx, CValue::by_val(len, usize_layout)); } Rvalue::NullaryOp(NullOp::Box, content_ty) => { - use rustc_middle::middle::lang_items::ExchangeMallocFnLangItem; - let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap(); let content_ty = fx.monomorphize(content_ty); let layout = fx.layout_of(content_ty); @@ -605,7 +773,11 @@ fn is_fat_ptr<'tcx>( let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty)); // Allocate space: - let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) { + let def_id = match fx + .tcx + .lang_items() + .require(rustc_hir::LangItem::ExchangeMalloc) + { Ok(id) => id, Err(s) => { fx.tcx @@ -613,7 +785,7 @@ fn is_fat_ptr<'tcx>( .fatal(&format!("allocation of `{}` {}", box_layout.ty, s)); } }; - let instance = ty::Instance::mono(fx.tcx, def_id); + let instance = ty::Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx); let func_ref = fx.get_function_ref(instance); let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]); let ptr = fx.bcx.inst_results(call)[0]; @@ -625,19 +797,20 @@ fn is_fat_ptr<'tcx>( .ty .is_sized(fx.tcx.at(stmt.source_info.span), ParamEnv::reveal_all())); let ty_size = fx.layout_of(fx.monomorphize(ty)).size.bytes(); - let val = CValue::const_val(fx, fx.layout_of(fx.tcx.types.usize), ty_size.into()); + let val = + CValue::const_val(fx, fx.layout_of(fx.tcx.types.usize), ty_size.into()); lval.write_cvalue(fx, val); } - Rvalue::Aggregate(kind, operands) => match **kind { + Rvalue::Aggregate(ref kind, ref operands) => match kind.as_ref() { AggregateKind::Array(_ty) => { - for (i, operand) in operands.into_iter().enumerate() { - let operand = trans_operand(fx, operand); + for (i, operand) in operands.iter().enumerate() { + let operand = codegen_operand(fx, operand); let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64); let to = lval.place_index(fx, index); to.write_cvalue(fx, operand); } } - _ => unreachable!("shouldn't exist at trans {:?}", to_place_and_rval.1), + _ => unreachable!("shouldn't exist at codegen {:?}", to_place_and_rval.1), }, } } @@ -649,60 +822,71 @@ fn is_fat_ptr<'tcx>( | StatementKind::AscribeUserType(..) => {} StatementKind::LlvmInlineAsm(asm) => { - use rustc_ast::ast::Name; + use rustc_span::symbol::Symbol; let LlvmInlineAsm { asm, - outputs: _, - inputs: _, + outputs, + inputs, } = &**asm; let rustc_hir::LlvmInlineAsmInner { - asm: asm_code, // Name - outputs, // Vec - inputs, // Vec - clobbers, // Vec - volatile, // bool - alignstack, // bool - dialect: _, // rustc_ast::ast::AsmDialect + asm: asm_code, // Name + outputs: output_names, // Vec + inputs: input_names, // Vec + clobbers, // Vec + volatile, // bool + alignstack, // bool + dialect: _, asm_str_style: _, } = asm; - match &*asm_code.as_str() { + match asm_code.as_str().trim() { "" => { - assert_eq!(inputs, &[Name::intern("r")]); - assert!(outputs.is_empty(), "{:?}", outputs); - // Black box } - "cpuid" | "cpuid\n" => { - assert_eq!(inputs, &[Name::intern("{eax}"), Name::intern("{ecx}")]); - - assert_eq!(outputs.len(), 4); - for (i, c) in (&["={eax}", "={ebx}", "={ecx}", "={edx}"]) + "mov %rbx, %rsi\n cpuid\n xchg %rbx, %rsi" => { + assert_eq!( + input_names, + &[Symbol::intern("{eax}"), Symbol::intern("{ecx}")] + ); + assert_eq!(output_names.len(), 4); + for (i, c) in (&["={eax}", "={esi}", "={ecx}", "={edx}"]) .iter() .enumerate() { - assert_eq!(&outputs[i].constraint.as_str(), c); - assert!(!outputs[i].is_rw); - assert!(!outputs[i].is_indirect); + assert_eq!(&output_names[i].constraint.as_str(), c); + assert!(!output_names[i].is_rw); + assert!(!output_names[i].is_indirect); } - assert_eq!(clobbers, &[Name::intern("rbx")]); + assert_eq!(clobbers, &[]); assert!(!volatile); assert!(!alignstack); - crate::trap::trap_unimplemented( - fx, - "__cpuid_count arch intrinsic is not supported", - ); + assert_eq!(inputs.len(), 2); + let leaf = codegen_operand(fx, &inputs[0].1).load_scalar(fx); // %eax + let subleaf = codegen_operand(fx, &inputs[1].1).load_scalar(fx); // %ecx + + let (eax, ebx, ecx, edx) = + crate::intrinsics::codegen_cpuid_call(fx, leaf, subleaf); + + assert_eq!(outputs.len(), 4); + codegen_place(fx, outputs[0]) + .write_cvalue(fx, CValue::by_val(eax, fx.layout_of(fx.tcx.types.u32))); + codegen_place(fx, outputs[1]) + .write_cvalue(fx, CValue::by_val(ebx, fx.layout_of(fx.tcx.types.u32))); + codegen_place(fx, outputs[2]) + .write_cvalue(fx, CValue::by_val(ecx, fx.layout_of(fx.tcx.types.u32))); + codegen_place(fx, outputs[3]) + .write_cvalue(fx, CValue::by_val(edx, fx.layout_of(fx.tcx.types.u32))); } "xgetbv" => { - assert_eq!(inputs, &[Name::intern("{ecx}")]); + assert_eq!(input_names, &[Symbol::intern("{ecx}")]); - assert_eq!(outputs.len(), 2); + assert_eq!(output_names.len(), 2); for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() { - assert_eq!(&outputs[i].constraint.as_str(), c); - assert!(!outputs[i].is_rw); - assert!(!outputs[i].is_indirect); + assert_eq!(&output_names[i].constraint.as_str(), c); + assert!(!output_names[i].is_rw); + assert!(!output_names[i].is_indirect); } assert_eq!(clobbers, &[]); @@ -712,39 +896,59 @@ fn is_fat_ptr<'tcx>( crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported"); } - _ => unimpl_fatal!(fx.tcx, stmt.source_info.span, "Inline assembly is not supported"), + // ___chkstk, ___chkstk_ms and __alloca are only used on Windows + _ if fx + .tcx + .symbol_name(fx.instance) + .name + .starts_with("___chkstk") => + { + crate::trap::trap_unimplemented(fx, "Stack probes are not supported"); + } + _ if fx.tcx.symbol_name(fx.instance).name == "__alloca" => { + crate::trap::trap_unimplemented(fx, "Alloca is not supported"); + } + // Used in sys::windows::abort_internal + "int $$0x29" => { + crate::trap::trap_unimplemented(fx, "Windows abort"); + } + _ => fx + .tcx + .sess + .span_fatal(stmt.source_info.span, "Inline assembly is not supported"), } } + StatementKind::Coverage { .. } => fx.tcx.sess.fatal("-Zcoverage is unimplemented"), } } fn codegen_array_len<'tcx>( - fx: &mut FunctionCx<'_, 'tcx, impl Backend>, + fx: &mut FunctionCx<'_, 'tcx, impl Module>, place: CPlace<'tcx>, ) -> Value { - match place.layout().ty.kind { + match *place.layout().ty.kind() { ty::Array(_elem_ty, len) => { - let len = fx.monomorphize(&len) - .eval(fx.tcx, ParamEnv::reveal_all()) + let len = fx + .monomorphize(len) .eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64; fx.bcx.ins().iconst(fx.pointer_type, len) } ty::Slice(_elem_ty) => place - .to_ptr_maybe_unsized(fx) + .to_ptr_maybe_unsized() .1 .expect("Length metadata for slice place"), _ => bug!("Rvalue::Len({:?})", place), } } -pub(crate) fn trans_place<'tcx>( - fx: &mut FunctionCx<'_, 'tcx, impl Backend>, +pub(crate) fn codegen_place<'tcx>( + fx: &mut FunctionCx<'_, 'tcx, impl Module>, place: Place<'tcx>, ) -> CPlace<'tcx> { let mut cplace = fx.get_local_place(place.local); for elem in place.projection { - match *elem { + match elem { PlaceElem::Deref => { cplace = cplace.place_deref(fx); } @@ -760,6 +964,7 @@ pub(crate) fn trans_place<'tcx>( min_length: _, from_end, } => { + let offset: u64 = offset; let index = if !from_end { fx.bcx.ins().iconst(fx.pointer_type, offset as i64) } else { @@ -772,23 +977,26 @@ pub(crate) fn trans_place<'tcx>( // These indices are generated by slice patterns. // slice[from:-to] in Python terms. - match cplace.layout().ty.kind { + let from: u64 = from; + let to: u64 = to; + + match cplace.layout().ty.kind() { ty::Array(elem_ty, _len) => { assert!(!from_end, "array subslices are never `from_end`"); let elem_layout = fx.layout_of(elem_ty); - let ptr = cplace.to_ptr(fx); + let ptr = cplace.to_ptr(); cplace = CPlace::for_ptr( - ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * from as i64), - fx.layout_of(fx.tcx.mk_array(elem_ty, to as u64 - from as u64)), + ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)), + fx.layout_of(fx.tcx.mk_array(elem_ty, to - from)), ); } ty::Slice(elem_ty) => { assert!(from_end, "slice subslices should be `from_end`"); let elem_layout = fx.layout_of(elem_ty); - let (ptr, len) = cplace.to_ptr_maybe_unsized(fx); + let (ptr, len) = cplace.to_ptr_maybe_unsized(); let len = len.unwrap(); cplace = CPlace::for_ptr_with_extra( - ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * from as i64), + ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * (from as i64)), fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)), cplace.layout(), ); @@ -805,15 +1013,61 @@ pub(crate) fn trans_place<'tcx>( cplace } -pub(crate) fn trans_operand<'tcx>( - fx: &mut FunctionCx<'_, 'tcx, impl Backend>, +pub(crate) fn codegen_operand<'tcx>( + fx: &mut FunctionCx<'_, 'tcx, impl Module>, operand: &Operand<'tcx>, ) -> CValue<'tcx> { match operand { Operand::Move(place) | Operand::Copy(place) => { - let cplace = trans_place(fx, *place); + let cplace = codegen_place(fx, *place); cplace.to_cvalue(fx) } - Operand::Constant(const_) => crate::constant::trans_constant(fx, const_), + Operand::Constant(const_) => crate::constant::codegen_constant(fx, const_), } } + +pub(crate) fn codegen_panic<'tcx>( + fx: &mut FunctionCx<'_, 'tcx, impl Module>, + msg_str: &str, + span: Span, +) { + let location = fx.get_caller_location(span).load_scalar(fx); + + let msg_ptr = fx.anonymous_str("assert", msg_str); + let msg_len = fx + .bcx + .ins() + .iconst(fx.pointer_type, i64::try_from(msg_str.len()).unwrap()); + let args = [msg_ptr, msg_len, location]; + + codegen_panic_inner(fx, rustc_hir::LangItem::Panic, &args, span); +} + +pub(crate) fn codegen_panic_inner<'tcx>( + fx: &mut FunctionCx<'_, 'tcx, impl Module>, + lang_item: rustc_hir::LangItem, + args: &[Value], + span: Span, +) { + let def_id = fx + .tcx + .lang_items() + .require(lang_item) + .unwrap_or_else(|s| fx.tcx.sess.span_fatal(span, &s)); + + let instance = Instance::mono(fx.tcx, def_id).polymorphize(fx.tcx); + let symbol_name = fx.tcx.symbol_name(instance).name; + + fx.lib_call( + &*symbol_name, + vec![ + AbiParam::new(fx.pointer_type), + AbiParam::new(fx.pointer_type), + AbiParam::new(fx.pointer_type), + ], + vec![], + args, + ); + + crate::trap::trap_unreachable(fx, "panic lang item returned"); +}