src/base.rs

   1 use rustc::ty::adjustment::PointerCast;
   2
   3 use crate::prelude::*;
   4
   5 pub fn trans_fn<'a, 'clif, 'tcx: 'a, B: Backend + 'static>(
   6     cx: &mut crate::CodegenCx<'clif, 'tcx, B>,
   7     instance: Instance<'tcx>,
   8     linkage: Linkage,
   9 ) {
  10     let tcx = cx.tcx;
  11
  12     let mir = tcx.instance_mir(instance.def);
  13
  14     // Declare function
  15     let (name, sig) = get_function_name_and_sig(tcx, instance, false);
  16     let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
  17     let mut debug_context = cx
  18         .debug_context
  19         .as_mut()
  20         .map(|debug_context| FunctionDebugContext::new(tcx, debug_context, mir, &name, &sig));
  21
  22     // Make FunctionBuilder
  23     let mut func = Function::with_name_signature(ExternalName::user(0, 0), sig);
  24     let mut func_ctx = FunctionBuilderContext::new();
  25     let mut bcx = FunctionBuilder::new(&mut func, &mut func_ctx);
  26
  27     // Predefine ebb's
  28     let start_ebb = bcx.create_ebb();
  29     let mut ebb_map: HashMap<BasicBlock, Ebb> = HashMap::new();
  30     for (bb, _bb_data) in mir.basic_blocks().iter_enumerated() {
  31         ebb_map.insert(bb, bcx.create_ebb());
  32     }
  33
  34     // Make FunctionCx
  35     let pointer_type = cx.module.target_config().pointer_type();
  36     let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
  37
  38     let mut fx = FunctionCx {
  39         tcx,
  40         module: cx.module,
  41         pointer_type,
  42
  43         instance,
  44         mir,
  45
  46         bcx,
  47         ebb_map,
  48         local_map: HashMap::new(),
  49
  50         clif_comments,
  51         constants: &mut cx.ccx,
  52         caches: &mut cx.caches,
  53         source_info_set: indexmap::IndexSet::new(),
  54     };
  55
  56     with_unimpl_span(fx.mir.span, || {
  57         crate::abi::codegen_fn_prelude(&mut fx, start_ebb);
  58         codegen_fn_content(&mut fx);
  59     });
  60
  61     // Recover all necessary data from fx, before accessing func will prevent future access to it.
  62     let instance = fx.instance;
  63     let clif_comments = fx.clif_comments;
  64     let source_info_set = fx.source_info_set;
  65
  66     #[cfg(debug_assertions)]
  67     crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &func, &clif_comments, None);
  68
  69     // Verify function
  70     verify_func(tcx, &clif_comments, &func);
  71
  72     // Define function
  73     let context = &mut cx.caches.context;
  74     context.func = func;
  75     cx.module
  76         .define_function(func_id, context)
  77         .unwrap();
  78
  79     let value_ranges = context.build_value_labels_ranges(cx.module.isa()).expect("value location ranges");
  80
  81     // Write optimized function to file for debugging
  82     #[cfg(debug_assertions)]
  83     crate::pretty_clif::write_clif_file(cx.tcx, "opt", instance, &context.func, &clif_comments, Some(&value_ranges));
  84
  85     // Define debuginfo for function
  86     let isa = cx.module.isa();
  87     debug_context
  88         .as_mut()
  89         .map(|x| x.define(tcx, context, isa, &source_info_set));
  90
  91     // Clear context to make it usable for the next function
  92     context.clear();
  93 }
  94
  95 fn verify_func(tcx: TyCtxt, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
  96     let flags = settings::Flags::new(settings::builder());
  97     match ::cranelift::codegen::verify_function(&func, &flags) {
  98         Ok(_) => {}
  99         Err(err) => {
 100             tcx.sess.err(&format!("{:?}", err));
 101             let pretty_error = ::cranelift::codegen::print_errors::pretty_verifier_error(
 102                 &func,
 103                 None,
 104                 Some(Box::new(writer)),
 105                 err,
 106             );
 107             tcx.sess
 108                 .fatal(&format!("cranelift verify error:\n{}", pretty_error));
 109         }
 110     }
 111 }
 112
 113 fn codegen_fn_content<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx, impl Backend>) {
 114     for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
 115         if bb_data.is_cleanup {
 116             // Unwinding after panicking is not supported
 117             continue;
 118         }
 119
 120         let ebb = fx.get_ebb(bb);
 121         fx.bcx.switch_to_block(ebb);
 122
 123         fx.bcx.ins().nop();
 124         for stmt in &bb_data.statements {
 125             fx.set_debug_loc(stmt.source_info);
 126             trans_stmt(fx, ebb, stmt);
 127         }
 128
 129         #[cfg(debug_assertions)]
 130         {
 131             let mut terminator_head = "\n".to_string();
 132             bb_data
 133                 .terminator()
 134                 .kind
 135                 .fmt_head(&mut terminator_head)
 136                 .unwrap();
 137             let inst = fx.bcx.func.layout.last_inst(ebb).unwrap();
 138             fx.add_comment(inst, terminator_head);
 139         }
 140
 141         fx.set_debug_loc(bb_data.terminator().source_info);
 142
 143         match &bb_data.terminator().kind {
 144             TerminatorKind::Goto { target } => {
 145                 let ebb = fx.get_ebb(*target);
 146                 fx.bcx.ins().jump(ebb, &[]);
 147             }
 148             TerminatorKind::Return => {
 149                 crate::abi::codegen_return(fx);
 150             }
 151             TerminatorKind::Assert {
 152                 cond,
 153                 expected,
 154                 msg,
 155                 target,
 156                 cleanup: _,
 157             } => {
 158                 let cond = trans_operand(fx, cond).load_scalar(fx);
 159                 // TODO HACK brz/brnz for i8/i16 is not yet implemented
 160                 let cond = fx.bcx.ins().uextend(types::I32, cond);
 161                 let target = fx.get_ebb(*target);
 162                 if *expected {
 163                     fx.bcx.ins().brnz(cond, target, &[]);
 164                 } else {
 165                     fx.bcx.ins().brz(cond, target, &[]);
 166                 };
 167                 trap_panic(fx, format!("[panic] Assert {:?} at {:?} failed.", msg, bb_data.terminator().source_info.span));
 168             }
 169
 170             TerminatorKind::SwitchInt {
 171                 discr,
 172                 switch_ty: _,
 173                 values,
 174                 targets,
 175             } => {
 176                 let discr = trans_operand(fx, discr).load_scalar(fx);
 177                 let mut switch = ::cranelift::frontend::Switch::new();
 178                 for (i, value) in values.iter().enumerate() {
 179                     let ebb = fx.get_ebb(targets[i]);
 180                     switch.set_entry(*value as u64, ebb);
 181                 }
 182                 let otherwise_ebb = fx.get_ebb(targets[targets.len() - 1]);
 183                 switch.emit(&mut fx.bcx, discr, otherwise_ebb);
 184             }
 185             TerminatorKind::Call {
 186                 func,
 187                 args,
 188                 destination,
 189                 cleanup: _,
 190                 from_hir_call: _,
 191             } => {
 192                 crate::abi::codegen_terminator_call(fx, func, args, destination);
 193             }
 194             TerminatorKind::Resume | TerminatorKind::Abort => {
 195                 trap_unreachable(fx, "[corruption] Unwinding bb reached.");
 196             }
 197             TerminatorKind::Unreachable => {
 198                 trap_unreachable(fx, "[corruption] Hit unreachable code.");
 199             }
 200             TerminatorKind::Yield { .. }
 201             | TerminatorKind::FalseEdges { .. }
 202             | TerminatorKind::FalseUnwind { .. }
 203             | TerminatorKind::DropAndReplace { .. }
 204             | TerminatorKind::GeneratorDrop => {
 205                 bug!("shouldn't exist at trans {:?}", bb_data.terminator());
 206             }
 207             TerminatorKind::Drop {
 208                 location,
 209                 target,
 210                 unwind: _,
 211             } => {
 212                 let drop_place = trans_place(fx, location);
 213                 crate::abi::codegen_drop(fx, drop_place);
 214
 215                 let target_ebb = fx.get_ebb(*target);
 216                 fx.bcx.ins().jump(target_ebb, &[]);
 217             }
 218         };
 219     }
 220
 221     fx.bcx.seal_all_blocks();
 222     fx.bcx.finalize();
 223 }
 224
 225 fn trans_stmt<'a, 'tcx: 'a>(
 226     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 227     cur_ebb: Ebb,
 228     stmt: &Statement<'tcx>,
 229 ) {
 230     let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
 231
 232     fx.set_debug_loc(stmt.source_info);
 233
 234     #[cfg(debug_assertions)]
 235     match &stmt.kind {
 236         StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
 237         _ => {
 238             let inst = fx.bcx.func.layout.last_inst(cur_ebb).unwrap();
 239             fx.add_comment(inst, format!("{:?}", stmt));
 240         }
 241     }
 242
 243     match &stmt.kind {
 244         StatementKind::SetDiscriminant {
 245             place,
 246             variant_index,
 247         } => {
 248             let place = trans_place(fx, place);
 249             let layout = place.layout();
 250             if layout.for_variant(&*fx, *variant_index).abi == layout::Abi::Uninhabited {
 251                 return;
 252             }
 253             match layout.variants {
 254                 layout::Variants::Single { index } => {
 255                     assert_eq!(index, *variant_index);
 256                 }
 257                 layout::Variants::Multiple {
 258                     discr: _,
 259                     discr_index,
 260                     discr_kind: layout::DiscriminantKind::Tag,
 261                     variants: _,
 262                 } => {
 263                     let ptr = place.place_field(fx, mir::Field::new(discr_index));
 264                     let to = layout
 265                         .ty
 266                         .discriminant_for_variant(fx.tcx, *variant_index)
 267                         .unwrap()
 268                         .val;
 269                     let discr = CValue::const_val(fx, ptr.layout().ty, to);
 270                     ptr.write_cvalue(fx, discr);
 271                 }
 272                 layout::Variants::Multiple {
 273                     discr: _,
 274                     discr_index,
 275                     discr_kind: layout::DiscriminantKind::Niche {
 276                         dataful_variant,
 277                         ref niche_variants,
 278                         niche_start,
 279                     },
 280                     variants: _,
 281                 } => {
 282                     if *variant_index != dataful_variant {
 283                         let niche = place.place_field(fx, mir::Field::new(discr_index));
 284                         //let niche_llty = niche.layout.immediate_llvm_type(bx.cx);
 285                         let niche_value =
 286                             ((variant_index.as_u32() - niche_variants.start().as_u32()) as u128)
 287                                 .wrapping_add(niche_start);
 288                         // FIXME(eddyb) Check the actual primitive type here.
 289                         let niche_llval = if niche_value == 0 {
 290                             CValue::const_val(fx, niche.layout().ty, 0)
 291                         } else {
 292                             CValue::const_val(fx, niche.layout().ty, niche_value)
 293                         };
 294                         niche.write_cvalue(fx, niche_llval);
 295                     }
 296                 }
 297             }
 298         }
 299         StatementKind::Assign(to_place, rval) => {
 300             let lval = trans_place(fx, to_place);
 301             let dest_layout = lval.layout();
 302             match &**rval {
 303                 Rvalue::Use(operand) => {
 304                     let val = trans_operand(fx, operand);
 305                     lval.write_cvalue(fx, val);
 306                 }
 307                 Rvalue::Ref(_, _, place) => {
 308                     let place = trans_place(fx, place);
 309                     place.write_place_ref(fx, lval);
 310                 }
 311                 Rvalue::BinaryOp(bin_op, lhs, rhs) => {
 312                     let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
 313                     let lhs = trans_operand(fx, lhs);
 314                     let rhs = trans_operand(fx, rhs);
 315
 316                     let res = match ty.sty {
 317                         ty::Bool => trans_bool_binop(fx, *bin_op, lhs, rhs),
 318                         ty::Uint(_) => {
 319                             trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
 320                         }
 321                         ty::Int(_) => {
 322                             trans_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
 323                         }
 324                         ty::Float(_) => trans_float_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
 325                         ty::Char => trans_char_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
 326                         ty::RawPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
 327                         ty::FnPtr(..) => trans_ptr_binop(fx, *bin_op, lhs, rhs, lval.layout().ty),
 328                         _ => unimplemented!("binop {:?} for {:?}", bin_op, ty),
 329                     };
 330                     lval.write_cvalue(fx, res);
 331                 }
 332                 Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
 333                     let ty = fx.monomorphize(&lhs.ty(fx.mir, fx.tcx));
 334                     let lhs = trans_operand(fx, lhs);
 335                     let rhs = trans_operand(fx, rhs);
 336
 337                     let res = match ty.sty {
 338                         ty::Uint(_) => {
 339                             trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, false)
 340                         }
 341                         ty::Int(_) => {
 342                             trans_checked_int_binop(fx, *bin_op, lhs, rhs, lval.layout().ty, true)
 343                         }
 344                         _ => unimplemented!("checked binop {:?} for {:?}", bin_op, ty),
 345                     };
 346                     lval.write_cvalue(fx, res);
 347                 }
 348                 Rvalue::UnaryOp(un_op, operand) => {
 349                     let operand = trans_operand(fx, operand);
 350                     let layout = operand.layout();
 351                     let val = operand.load_scalar(fx);
 352                     let res = match un_op {
 353                         UnOp::Not => {
 354                             match layout.ty.sty {
 355                                 ty::Bool => {
 356                                     let val = fx.bcx.ins().uextend(types::I32, val); // WORKAROUND for CraneStation/cranelift#466
 357                                     let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
 358                                     fx.bcx.ins().bint(types::I8, res)
 359                                 }
 360                                 ty::Uint(_) | ty::Int(_) => {
 361                                     fx.bcx.ins().bnot(val)
 362                                 }
 363                                 _ => unimplemented!("un op Not for {:?}", layout.ty),
 364                             }
 365                         }
 366                         UnOp::Neg => match layout.ty.sty {
 367                             ty::Int(_) => {
 368                                 let clif_ty = fx.clif_type(layout.ty).unwrap();
 369                                 if clif_ty == types::I128 {
 370                                     crate::trap::trap_unreachable_ret_value(fx, layout, "i128 neg is not yet supported").load_scalar(fx)
 371                                 } else {
 372                                     let zero = fx.bcx.ins().iconst(clif_ty, 0);
 373                                     fx.bcx.ins().isub(zero, val)
 374                                 }
 375                             }
 376                             ty::Float(_) => fx.bcx.ins().fneg(val),
 377                             _ => unimplemented!("un op Neg for {:?}", layout.ty),
 378                         },
 379                     };
 380                     lval.write_cvalue(fx, CValue::by_val(res, layout));
 381                 }
 382                 Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, ty) => {
 383                     let layout = fx.layout_of(ty);
 384                     match fx
 385                         .monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx))
 386                         .sty
 387                     {
 388                         ty::FnDef(def_id, substs) => {
 389                             let func_ref = fx.get_function_ref(
 390                                 Instance::resolve(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
 391                                     .unwrap(),
 392                             );
 393                             let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
 394                             lval.write_cvalue(fx, CValue::by_val(func_addr, layout));
 395                         }
 396                         _ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", ty),
 397                     }
 398                 }
 399                 Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, ty)
 400                 | Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, ty) => {
 401                     let operand = trans_operand(fx, operand);
 402                     let layout = fx.layout_of(ty);
 403                     lval.write_cvalue(fx, operand.unchecked_cast_to(layout));
 404                 }
 405                 Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
 406                     let operand = trans_operand(fx, operand);
 407                     let from_ty = operand.layout().ty;
 408
 409                     fn is_fat_ptr<'a, 'tcx: 'a>(fx: &FunctionCx<'a, 'tcx, impl Backend>, ty: Ty<'tcx>) -> bool {
 410                         ty
 411                             .builtin_deref(true)
 412                             .map(|ty::TypeAndMut {ty: pointee_ty, mutbl: _ }| fx.layout_of(pointee_ty).is_unsized())
 413                             .unwrap_or(false)
 414                     }
 415
 416                     if is_fat_ptr(fx, from_ty) {
 417                         if is_fat_ptr(fx, to_ty) {
 418                             // fat-ptr -> fat-ptr
 419                             lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
 420                         } else {
 421                             // fat-ptr -> thin-ptr
 422                             let (ptr, _extra) = operand.load_scalar_pair(fx);
 423                             lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
 424                         }
 425                     } else if let ty::Adt(adt_def, _substs) = from_ty.sty {
 426                         // enum -> discriminant value
 427                         assert!(adt_def.is_enum());
 428                         match to_ty.sty {
 429                             ty::Uint(_) | ty::Int(_) => {},
 430                             _ => unreachable!("cast adt {} -> {}", from_ty, to_ty),
 431                         }
 432
 433                         // FIXME avoid forcing to stack
 434                         let place =
 435                             CPlace::for_addr(operand.force_stack(fx), operand.layout());
 436                         let discr = trans_get_discriminant(fx, place, fx.layout_of(to_ty));
 437                         lval.write_cvalue(fx, discr);
 438                     } else {
 439                         let from_clif_ty = fx.clif_type(from_ty).unwrap();
 440                         let to_clif_ty = fx.clif_type(to_ty).unwrap();
 441                         let from = operand.load_scalar(fx);
 442
 443                         let signed = match from_ty.sty {
 444                             ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..) | ty::Char | ty::Uint(..) | ty::Bool => false,
 445                             ty::Int(..) => true,
 446                             ty::Float(..) => false, // `signed` is unused for floats
 447                             _ => panic!("{}", from_ty),
 448                         };
 449
 450                         let res = if from_clif_ty.is_int() && to_clif_ty.is_int() {
 451                             // int-like -> int-like
 452                             crate::common::clif_intcast(
 453                                 fx,
 454                                 from,
 455                                 to_clif_ty,
 456                                 signed,
 457                             )
 458                         } else if from_clif_ty.is_int() && to_clif_ty.is_float() {
 459                             // int-like -> float
 460                             if signed {
 461                                 fx.bcx.ins().fcvt_from_sint(to_clif_ty, from)
 462                             } else {
 463                                 fx.bcx.ins().fcvt_from_uint(to_clif_ty, from)
 464                             }
 465                         } else if from_clif_ty.is_float() && to_clif_ty.is_int() {
 466                             // float -> int-like
 467                             let from = operand.load_scalar(fx);
 468                             if signed {
 469                                 fx.bcx.ins().fcvt_to_sint_sat(to_clif_ty, from)
 470                             } else {
 471                                 fx.bcx.ins().fcvt_to_uint_sat(to_clif_ty, from)
 472                             }
 473                         } else if from_clif_ty.is_float() && to_clif_ty.is_float() {
 474                             // float -> float
 475                             match (from_clif_ty, to_clif_ty) {
 476                                 (types::F32, types::F64) => {
 477                                     fx.bcx.ins().fpromote(types::F64, from)
 478                                 }
 479                                 (types::F64, types::F32) => {
 480                                     fx.bcx.ins().fdemote(types::F32, from)
 481                                 }
 482                                 _ => from,
 483                             }
 484                         } else {
 485                             unimpl!("rval misc {:?} {:?}", from_ty, to_ty)
 486                         };
 487                         lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
 488                     }
 489                 }
 490                 Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _ty) => {
 491                     let operand = trans_operand(fx, operand);
 492                     match operand.layout().ty.sty {
 493                         ty::Closure(def_id, substs) => {
 494                             let instance = Instance::resolve_closure(
 495                                 fx.tcx,
 496                                 def_id,
 497                                 substs,
 498                                 ty::ClosureKind::FnOnce,
 499                             );
 500                             let func_ref = fx.get_function_ref(instance);
 501                             let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
 502                             lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
 503                         }
 504                         _ => {
 505                             bug!("{} cannot be cast to a fn ptr", operand.layout().ty)
 506                         }
 507                     }
 508                 }
 509                 Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _ty) => {
 510                     let operand = trans_operand(fx, operand);
 511                     operand.unsize_value(fx, lval);
 512                 }
 513                 Rvalue::Discriminant(place) => {
 514                     let place = trans_place(fx, place);
 515                     let discr = trans_get_discriminant(fx, place, dest_layout);
 516                     lval.write_cvalue(fx, discr);
 517                 }
 518                 Rvalue::Repeat(operand, times) => {
 519                     let operand = trans_operand(fx, operand);
 520                     for i in 0..*times {
 521                         let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
 522                         let to = lval.place_index(fx, index);
 523                         to.write_cvalue(fx, operand);
 524                     }
 525                 }
 526                 Rvalue::Len(place) => {
 527                     let place = trans_place(fx, place);
 528                     let usize_layout = fx.layout_of(fx.tcx.types.usize);
 529                     let len = codegen_array_len(fx, place);
 530                     lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
 531                 }
 532                 Rvalue::NullaryOp(NullOp::Box, content_ty) => {
 533                     use rustc::middle::lang_items::ExchangeMallocFnLangItem;
 534
 535                     let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
 536                     let layout = fx.layout_of(content_ty);
 537                     let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
 538                     let llalign = fx
 539                         .bcx
 540                         .ins()
 541                         .iconst(usize_type, layout.align.abi.bytes() as i64);
 542                     let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
 543
 544                     // Allocate space:
 545                     let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
 546                         Ok(id) => id,
 547                         Err(s) => {
 548                             fx.tcx
 549                                 .sess
 550                                 .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
 551                         }
 552                     };
 553                     let instance = ty::Instance::mono(fx.tcx, def_id);
 554                     let func_ref = fx.get_function_ref(instance);
 555                     let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
 556                     let ptr = fx.bcx.inst_results(call)[0];
 557                     lval.write_cvalue(fx, CValue::by_val(ptr, box_layout));
 558                 }
 559                 Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
 560                     assert!(lval
 561                         .layout()
 562                         .ty
 563                         .is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all()));
 564                     let ty_size = fx.layout_of(ty).size.bytes();
 565                     let val = CValue::const_val(fx, fx.tcx.types.usize, ty_size.into());
 566                     lval.write_cvalue(fx, val);
 567                 }
 568                 Rvalue::Aggregate(kind, operands) => match **kind {
 569                     AggregateKind::Array(_ty) => {
 570                         for (i, operand) in operands.into_iter().enumerate() {
 571                             let operand = trans_operand(fx, operand);
 572                             let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
 573                             let to = lval.place_index(fx, index);
 574                             to.write_cvalue(fx, operand);
 575                         }
 576                     }
 577                     _ => unimpl!("shouldn't exist at trans {:?}", rval),
 578                 },
 579             }
 580         }
 581         StatementKind::StorageLive(_)
 582         | StatementKind::StorageDead(_)
 583         | StatementKind::Nop
 584         | StatementKind::FakeRead(..)
 585         | StatementKind::Retag { .. }
 586         | StatementKind::AscribeUserType(..) => {}
 587
 588         StatementKind::InlineAsm(asm) => {
 589             use syntax::ast::Name;
 590             let InlineAsm { asm, outputs: _, inputs: _ } = &**asm;
 591             let rustc::hir::InlineAsm {
 592                 asm: asm_code, // Name
 593                 outputs, // Vec<Name>
 594                 inputs, // Vec<Name>
 595                 clobbers, // Vec<Name>
 596                 volatile, // bool
 597                 alignstack, // bool
 598                 dialect: _, // syntax::ast::AsmDialect
 599                 asm_str_style: _,
 600                 ctxt: _,
 601             } = asm;
 602             match &*asm_code.as_str() {
 603                 "cpuid" | "cpuid\n" => {
 604                     assert_eq!(inputs, &[Name::intern("{eax}"), Name::intern("{ecx}")]);
 605
 606                     assert_eq!(outputs.len(), 4);
 607                     for (i, c) in (&["={eax}", "={ebx}", "={ecx}", "={edx}"]).iter().enumerate() {
 608                         assert_eq!(&outputs[i].constraint.as_str(), c);
 609                         assert!(!outputs[i].is_rw);
 610                         assert!(!outputs[i].is_indirect);
 611                     }
 612
 613                     assert_eq!(clobbers, &[Name::intern("rbx")]);
 614
 615                     assert!(!volatile);
 616                     assert!(!alignstack);
 617
 618                     crate::trap::trap_unimplemented(fx, "__cpuid_count arch intrinsic is not supported");
 619                 }
 620                 "xgetbv" => {
 621                     assert_eq!(inputs, &[Name::intern("{ecx}")]);
 622
 623                     assert_eq!(outputs.len(), 2);
 624                     for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() {
 625                         assert_eq!(&outputs[i].constraint.as_str(), c);
 626                         assert!(!outputs[i].is_rw);
 627                         assert!(!outputs[i].is_indirect);
 628                     }
 629
 630                     assert_eq!(clobbers, &[]);
 631
 632                     assert!(!volatile);
 633                     assert!(!alignstack);
 634
 635                     crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported");
 636                 }
 637                 _ if fx.tcx.symbol_name(fx.instance).as_str() == "__rust_probestack" => {
 638                     crate::trap::trap_unimplemented(fx, "__rust_probestack is not supported");
 639                 }
 640                 _ => unimpl!("Inline assembly is not supported"),
 641             }
 642         }
 643     }
 644 }
 645
 646 fn codegen_array_len<'a, 'tcx: 'a>(
 647     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 648     place: CPlace<'tcx>,
 649 ) -> Value {
 650     match place.layout().ty.sty {
 651         ty::Array(_elem_ty, len) => {
 652             let len = crate::constant::force_eval_const(fx, len).unwrap_usize(fx.tcx) as i64;
 653             fx.bcx.ins().iconst(fx.pointer_type, len)
 654         }
 655         ty::Slice(_elem_ty) => place
 656             .to_addr_maybe_unsized(fx)
 657             .1
 658             .expect("Length metadata for slice place"),
 659         _ => bug!("Rvalue::Len({:?})", place),
 660     }
 661 }
 662
 663 pub fn trans_get_discriminant<'a, 'tcx: 'a>(
 664     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 665     place: CPlace<'tcx>,
 666     dest_layout: TyLayout<'tcx>,
 667 ) -> CValue<'tcx> {
 668     let layout = place.layout();
 669
 670     if layout.abi == layout::Abi::Uninhabited {
 671         return trap_unreachable_ret_value(fx, dest_layout, "[panic] Tried to get discriminant for uninhabited type.");
 672     }
 673
 674     let (discr_scalar, discr_index, discr_kind) = match &layout.variants {
 675         layout::Variants::Single { index } => {
 676             let discr_val = layout
 677                 .ty
 678                 .ty_adt_def()
 679                 .map_or(index.as_u32() as u128, |def| {
 680                     def.discriminant_for_variant(fx.tcx, *index).val
 681                 });
 682             return CValue::const_val(fx, dest_layout.ty, discr_val);
 683         }
 684         layout::Variants::Multiple { discr, discr_index, discr_kind, variants: _ } => {
 685             (discr, *discr_index, discr_kind)
 686         }
 687     };
 688
 689     let discr = place.place_field(fx, mir::Field::new(discr_index)).to_cvalue(fx);
 690     let discr_ty = discr.layout().ty;
 691     let lldiscr = discr.load_scalar(fx);
 692     match discr_kind {
 693         layout::DiscriminantKind::Tag => {
 694             let signed = match discr_scalar.value {
 695                 layout::Int(_, signed) => signed,
 696                 _ => false,
 697             };
 698             let val = clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), signed);
 699             return CValue::by_val(val, dest_layout);
 700         }
 701         layout::DiscriminantKind::Niche {
 702             dataful_variant,
 703             ref niche_variants,
 704             niche_start,
 705         } => {
 706             let niche_llty = fx.clif_type(discr_ty).unwrap();
 707             let dest_clif_ty = fx.clif_type(dest_layout.ty).unwrap();
 708             if niche_variants.start() == niche_variants.end() {
 709                 let b = fx
 710                     .bcx
 711                     .ins()
 712                     .icmp_imm(IntCC::Equal, lldiscr, *niche_start as u64 as i64);
 713                 let if_true = fx
 714                     .bcx
 715                     .ins()
 716                     .iconst(dest_clif_ty, niche_variants.start().as_u32() as i64);
 717                 let if_false = fx
 718                     .bcx
 719                     .ins()
 720                     .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
 721                 let val = fx.bcx.ins().select(b, if_true, if_false);
 722                 return CValue::by_val(val, dest_layout);
 723             } else {
 724                 // Rebase from niche values to discriminant values.
 725                 let delta = niche_start.wrapping_sub(niche_variants.start().as_u32() as u128);
 726                 let delta = fx.bcx.ins().iconst(niche_llty, delta as u64 as i64);
 727                 let lldiscr = fx.bcx.ins().isub(lldiscr, delta);
 728                 let b = fx.bcx.ins().icmp_imm(
 729                     IntCC::UnsignedLessThanOrEqual,
 730                     lldiscr,
 731                     niche_variants.end().as_u32() as i64,
 732                 );
 733                 let if_true =
 734                     clif_intcast(fx, lldiscr, fx.clif_type(dest_layout.ty).unwrap(), false);
 735                 let if_false = fx
 736                     .bcx
 737                     .ins()
 738                     .iconst(dest_clif_ty, dataful_variant.as_u32() as i64);
 739                 let val = fx.bcx.ins().select(b, if_true, if_false);
 740                 return CValue::by_val(val, dest_layout);
 741             }
 742         }
 743     }
 744 }
 745
 746 macro_rules! binop_match {
 747     (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, bug) => {
 748         bug!("binop {} on {} lhs: {:?} rhs: {:?}", stringify!($var), $bug_fmt, $lhs, $rhs)
 749     };
 750     (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, icmp($cc:ident)) => {{
 751         assert_eq!($fx.tcx.types.bool, $ret_ty);
 752         let ret_layout = $fx.layout_of($ret_ty);
 753
 754         let b = $fx.bcx.ins().icmp(IntCC::$cc, $lhs, $rhs);
 755         CValue::by_val($fx.bcx.ins().bint(types::I8, b), ret_layout)
 756     }};
 757     (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, fcmp($cc:ident)) => {{
 758         assert_eq!($fx.tcx.types.bool, $ret_ty);
 759         let ret_layout = $fx.layout_of($ret_ty);
 760         let b = $fx.bcx.ins().fcmp(FloatCC::$cc, $lhs, $rhs);
 761         CValue::by_val($fx.bcx.ins().bint(types::I8, b), ret_layout)
 762     }};
 763     (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, custom(|| $body:expr)) => {{
 764         $body
 765     }};
 766     (@single $fx:expr, $bug_fmt:expr, $var:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $name:ident) => {{
 767         let ret_layout = $fx.layout_of($ret_ty);
 768         CValue::by_val($fx.bcx.ins().$name($lhs, $rhs), ret_layout)
 769     }};
 770     (
 771         $fx:expr, $bin_op:expr, $signed:expr, $lhs:expr, $rhs:expr, $ret_ty:expr, $bug_fmt:expr;
 772         $(
 773             $var:ident ($sign:pat) $name:tt $( ( $($next:tt)* ) )? ;
 774         )*
 775     ) => {{
 776         let lhs = $lhs.load_scalar($fx);
 777         let rhs = $rhs.load_scalar($fx);
 778         match ($bin_op, $signed) {
 779             $(
 780                 (BinOp::$var, $sign) => binop_match!(@single $fx, $bug_fmt, $var, $signed, lhs, rhs, $ret_ty, $name $( ( $($next)* ) )?),
 781             )*
 782         }
 783     }}
 784 }
 785
 786 fn trans_bool_binop<'a, 'tcx: 'a>(
 787     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 788     bin_op: BinOp,
 789     lhs: CValue<'tcx>,
 790     rhs: CValue<'tcx>,
 791 ) -> CValue<'tcx> {
 792     let res = binop_match! {
 793         fx, bin_op, false, lhs, rhs, fx.tcx.types.bool, "bool";
 794         Add (_) bug;
 795         Sub (_) bug;
 796         Mul (_) bug;
 797         Div (_) bug;
 798         Rem (_) bug;
 799         BitXor (_) bxor;
 800         BitAnd (_) band;
 801         BitOr (_) bor;
 802         Shl (_) bug;
 803         Shr (_) bug;
 804
 805         Eq (_) icmp(Equal);
 806         Lt (_) icmp(UnsignedLessThan);
 807         Le (_) icmp(UnsignedLessThanOrEqual);
 808         Ne (_) icmp(NotEqual);
 809         Ge (_) icmp(UnsignedGreaterThanOrEqual);
 810         Gt (_) icmp(UnsignedGreaterThan);
 811
 812         Offset (_) bug;
 813     };
 814
 815     res
 816 }
 817
 818 pub fn trans_int_binop<'a, 'tcx: 'a>(
 819     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 820     bin_op: BinOp,
 821     lhs: CValue<'tcx>,
 822     rhs: CValue<'tcx>,
 823     out_ty: Ty<'tcx>,
 824     signed: bool,
 825 ) -> CValue<'tcx> {
 826     if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
 827         assert_eq!(
 828             lhs.layout().ty,
 829             rhs.layout().ty,
 830             "int binop requires lhs and rhs of same type"
 831         );
 832     }
 833
 834     if let Some(res) = crate::codegen_i128::maybe_codegen(fx, bin_op, false, signed, lhs, rhs, out_ty) {
 835         return res;
 836     }
 837
 838     binop_match! {
 839         fx, bin_op, signed, lhs, rhs, out_ty, "int/uint";
 840         Add (_) iadd;
 841         Sub (_) isub;
 842         Mul (_) imul;
 843         Div (false) udiv;
 844         Div (true) sdiv;
 845         Rem (false) urem;
 846         Rem (true) srem;
 847         BitXor (_) bxor;
 848         BitAnd (_) band;
 849         BitOr (_) bor;
 850         Shl (_) ishl;
 851         Shr (false) ushr;
 852         Shr (true) sshr;
 853
 854         Eq (_) icmp(Equal);
 855         Lt (false) icmp(UnsignedLessThan);
 856         Lt (true) icmp(SignedLessThan);
 857         Le (false) icmp(UnsignedLessThanOrEqual);
 858         Le (true) icmp(SignedLessThanOrEqual);
 859         Ne (_) icmp(NotEqual);
 860         Ge (false) icmp(UnsignedGreaterThanOrEqual);
 861         Ge (true) icmp(SignedGreaterThanOrEqual);
 862         Gt (false) icmp(UnsignedGreaterThan);
 863         Gt (true) icmp(SignedGreaterThan);
 864
 865         Offset (_) bug;
 866     }
 867 }
 868
 869 pub fn trans_checked_int_binop<'a, 'tcx: 'a>(
 870     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 871     bin_op: BinOp,
 872     in_lhs: CValue<'tcx>,
 873     in_rhs: CValue<'tcx>,
 874     out_ty: Ty<'tcx>,
 875     signed: bool,
 876 ) -> CValue<'tcx> {
 877     if !fx.tcx.sess.overflow_checks() {
 878         return trans_int_binop(fx, bin_op, in_lhs, in_rhs, out_ty, signed);
 879     }
 880
 881     if bin_op != BinOp::Shl && bin_op != BinOp::Shr {
 882         assert_eq!(
 883             in_lhs.layout().ty,
 884             in_rhs.layout().ty,
 885             "checked int binop requires lhs and rhs of same type"
 886         );
 887     }
 888
 889     let lhs = in_lhs.load_scalar(fx);
 890     let rhs = in_rhs.load_scalar(fx);
 891
 892     if let Some(res) = crate::codegen_i128::maybe_codegen(fx, bin_op, true, signed, in_lhs, in_rhs, out_ty) {
 893         return res;
 894     }
 895
 896     let (res, has_overflow) = match bin_op {
 897         BinOp::Add => {
 898             /*let (val, c_out) = fx.bcx.ins().iadd_cout(lhs, rhs);
 899             (val, c_out)*/
 900             // FIXME(CraneStation/cranelift#849) legalize iadd_cout for i8 and i16
 901             let val = fx.bcx.ins().iadd(lhs, rhs);
 902             let has_overflow = if !signed {
 903                 fx.bcx.ins().icmp(IntCC::UnsignedLessThan, val, lhs)
 904             } else {
 905                 let rhs_is_negative = fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, rhs, 0);
 906                 let slt = fx.bcx.ins().icmp(IntCC::SignedLessThan, val, lhs);
 907                 fx.bcx.ins().bxor(rhs_is_negative, slt)
 908             };
 909             (val, has_overflow)
 910         }
 911         BinOp::Sub => {
 912             /*let (val, b_out) = fx.bcx.ins().isub_bout(lhs, rhs);
 913             (val, b_out)*/
 914             // FIXME(CraneStation/cranelift#849) legalize isub_bout for i8 and i16
 915             let val = fx.bcx.ins().isub(lhs, rhs);
 916             let has_overflow = if !signed {
 917                 fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, val, lhs)
 918             } else {
 919                 let rhs_is_negative = fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, rhs, 0);
 920                 let sgt = fx.bcx.ins().icmp(IntCC::SignedGreaterThan, val, lhs);
 921                 fx.bcx.ins().bxor(rhs_is_negative, sgt)
 922             };
 923             (val, has_overflow)
 924         }
 925         BinOp::Mul => {
 926             let val = fx.bcx.ins().imul(lhs, rhs);
 927             /*let val_hi = if !signed {
 928                 fx.bcx.ins().umulhi(lhs, rhs)
 929             } else {
 930                 fx.bcx.ins().smulhi(lhs, rhs)
 931             };
 932             let has_overflow = fx.bcx.ins().icmp_imm(IntCC::NotEqual, val_hi, 0);*/
 933             // TODO: check for overflow
 934             let has_overflow = fx.bcx.ins().bconst(types::B1, false);
 935             (val, has_overflow)
 936         }
 937         BinOp::Shl => {
 938             let val = fx.bcx.ins().ishl(lhs, rhs);
 939             // TODO: check for overflow
 940             let has_overflow = fx.bcx.ins().bconst(types::B1, false);
 941             (val, has_overflow)
 942         }
 943         BinOp::Shr => {
 944             let val = if !signed {
 945                 fx.bcx.ins().ushr(lhs, rhs)
 946             } else {
 947                 fx.bcx.ins().sshr(lhs, rhs)
 948             };
 949             // TODO: check for overflow
 950             let has_overflow = fx.bcx.ins().bconst(types::B1, false);
 951             (val, has_overflow)
 952         }
 953         _ => bug!(
 954             "binop {:?} on checked int/uint lhs: {:?} rhs: {:?}",
 955             bin_op,
 956             in_lhs,
 957             in_rhs
 958         ),
 959     };
 960
 961     let has_overflow = fx.bcx.ins().bint(types::I8, has_overflow);
 962     let out_place = CPlace::new_stack_slot(fx, out_ty);
 963     let out_layout = out_place.layout();
 964     out_place.write_cvalue(fx, CValue::by_val_pair(res, has_overflow, out_layout));
 965
 966     out_place.to_cvalue(fx)
 967 }
 968
 969 fn trans_float_binop<'a, 'tcx: 'a>(
 970     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 971     bin_op: BinOp,
 972     lhs: CValue<'tcx>,
 973     rhs: CValue<'tcx>,
 974     ty: Ty<'tcx>,
 975 ) -> CValue<'tcx> {
 976     let res = binop_match! {
 977         fx, bin_op, false, lhs, rhs, ty, "float";
 978         Add (_) fadd;
 979         Sub (_) fsub;
 980         Mul (_) fmul;
 981         Div (_) fdiv;
 982         Rem (_) custom(|| {
 983             assert_eq!(lhs.layout().ty, ty);
 984             assert_eq!(rhs.layout().ty, ty);
 985             match ty.sty {
 986                 ty::Float(FloatTy::F32) => fx.easy_call("fmodf", &[lhs, rhs], ty),
 987                 ty::Float(FloatTy::F64) => fx.easy_call("fmod", &[lhs, rhs], ty),
 988                 _ => bug!(),
 989             }
 990         });
 991         BitXor (_) bxor;
 992         BitAnd (_) band;
 993         BitOr (_) bor;
 994         Shl (_) bug;
 995         Shr (_) bug;
 996
 997         Eq (_) fcmp(Equal);
 998         Lt (_) fcmp(LessThan);
 999         Le (_) fcmp(LessThanOrEqual);
1000         Ne (_) fcmp(NotEqual);
1001         Ge (_) fcmp(GreaterThanOrEqual);
1002         Gt (_) fcmp(GreaterThan);
1003
1004         Offset (_) bug;
1005     };
1006
1007     res
1008 }
1009
1010 fn trans_char_binop<'a, 'tcx: 'a>(
1011     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1012     bin_op: BinOp,
1013     lhs: CValue<'tcx>,
1014     rhs: CValue<'tcx>,
1015     ty: Ty<'tcx>,
1016 ) -> CValue<'tcx> {
1017     let res = binop_match! {
1018         fx, bin_op, false, lhs, rhs, ty, "char";
1019         Add (_) bug;
1020         Sub (_) bug;
1021         Mul (_) bug;
1022         Div (_) bug;
1023         Rem (_) bug;
1024         BitXor (_) bug;
1025         BitAnd (_) bug;
1026         BitOr (_) bug;
1027         Shl (_) bug;
1028         Shr (_) bug;
1029
1030         Eq (_) icmp(Equal);
1031         Lt (_) icmp(UnsignedLessThan);
1032         Le (_) icmp(UnsignedLessThanOrEqual);
1033         Ne (_) icmp(NotEqual);
1034         Ge (_) icmp(UnsignedGreaterThanOrEqual);
1035         Gt (_) icmp(UnsignedGreaterThan);
1036
1037         Offset (_) bug;
1038     };
1039
1040     res
1041 }
1042
1043 fn trans_ptr_binop<'a, 'tcx: 'a>(
1044     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1045     bin_op: BinOp,
1046     lhs: CValue<'tcx>,
1047     rhs: CValue<'tcx>,
1048     ret_ty: Ty<'tcx>,
1049 ) -> CValue<'tcx> {
1050     let not_fat = match lhs.layout().ty.sty {
1051         ty::RawPtr(TypeAndMut { ty, mutbl: _ }) => {
1052             ty.is_sized(fx.tcx.at(DUMMY_SP), ParamEnv::reveal_all())
1053         }
1054         ty::FnPtr(..) => true,
1055         _ => bug!("trans_ptr_binop on non ptr"),
1056     };
1057     if not_fat {
1058         if let BinOp::Offset = bin_op {
1059             let (base, offset) = (lhs, rhs.load_scalar(fx));
1060             let pointee_ty = base.layout().ty.builtin_deref(true).unwrap().ty;
1061             let pointee_size = fx.layout_of(pointee_ty).size.bytes();
1062             let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
1063             let base_val = base.load_scalar(fx);
1064             let res = fx.bcx.ins().iadd(base_val, ptr_diff);
1065             return CValue::by_val(res, base.layout());
1066         }
1067
1068         binop_match! {
1069             fx, bin_op, false, lhs, rhs, ret_ty, "ptr";
1070             Add (_) bug;
1071             Sub (_) bug;
1072             Mul (_) bug;
1073             Div (_) bug;
1074             Rem (_) bug;
1075             BitXor (_) bug;
1076             BitAnd (_) bug;
1077             BitOr (_) bug;
1078             Shl (_) bug;
1079             Shr (_) bug;
1080
1081             Eq (_) icmp(Equal);
1082             Lt (_) icmp(UnsignedLessThan);
1083             Le (_) icmp(UnsignedLessThanOrEqual);
1084             Ne (_) icmp(NotEqual);
1085             Ge (_) icmp(UnsignedGreaterThanOrEqual);
1086             Gt (_) icmp(UnsignedGreaterThan);
1087
1088             Offset (_) bug; // Handled above
1089         }
1090     } else {
1091         let (lhs_ptr, lhs_extra) = lhs.load_scalar_pair(fx);
1092         let (rhs_ptr, rhs_extra) = rhs.load_scalar_pair(fx);
1093
1094         let res = match bin_op {
1095             BinOp::Eq => {
1096                 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
1097                 let extra_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_extra, rhs_extra);
1098                 fx.bcx.ins().band(ptr_eq, extra_eq)
1099             }
1100             BinOp::Ne => {
1101                 let ptr_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_ptr, rhs_ptr);
1102                 let extra_ne = fx.bcx.ins().icmp(IntCC::NotEqual, lhs_extra, rhs_extra);
1103                 fx.bcx.ins().bor(ptr_ne, extra_ne)
1104             }
1105             BinOp::Lt | BinOp::Le | BinOp::Ge | BinOp::Gt => {
1106                 let ptr_eq = fx.bcx.ins().icmp(IntCC::Equal, lhs_ptr, rhs_ptr);
1107
1108                 let ptr_cmp = fx.bcx.ins().icmp(match bin_op {
1109                     BinOp::Lt => IntCC::UnsignedLessThan,
1110                     BinOp::Le => IntCC::UnsignedLessThanOrEqual,
1111                     BinOp::Ge => IntCC::UnsignedGreaterThanOrEqual,
1112                     BinOp::Gt => IntCC::UnsignedGreaterThan,
1113                     _ => unreachable!(),
1114                 }, lhs_ptr, rhs_ptr);
1115
1116                 let extra_cmp = fx.bcx.ins().icmp(match bin_op {
1117                     BinOp::Lt => IntCC::UnsignedLessThan,
1118                     BinOp::Le => IntCC::UnsignedLessThanOrEqual,
1119                     BinOp::Ge => IntCC::UnsignedGreaterThanOrEqual,
1120                     BinOp::Gt => IntCC::UnsignedGreaterThan,
1121                     _ => unreachable!(),
1122                 }, lhs_extra, rhs_extra);
1123
1124                 fx.bcx.ins().select(ptr_eq, extra_cmp, ptr_cmp)
1125             }
1126             _ => panic!("bin_op {:?} on ptr", bin_op),
1127         };
1128
1129         assert_eq!(fx.tcx.types.bool, ret_ty);
1130         let ret_layout = fx.layout_of(ret_ty);
1131         CValue::by_val(fx.bcx.ins().bint(types::I8, res), ret_layout)
1132     }
1133 }
1134
1135 pub fn trans_place<'a, 'tcx: 'a>(
1136     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1137     place: &Place<'tcx>,
1138 ) -> CPlace<'tcx> {
1139     let base = match &place.base {
1140         PlaceBase::Local(local) => fx.get_local_place(*local),
1141         PlaceBase::Static(static_) => match static_.kind {
1142             StaticKind::Static(def_id) => {
1143                 crate::constant::codegen_static_ref(fx, def_id, static_.ty)
1144             }
1145             StaticKind::Promoted(promoted) => {
1146                 crate::constant::trans_promoted(fx, promoted, static_.ty)
1147             }
1148         }
1149     };
1150
1151     trans_place_projection(fx, base, &place.projection)
1152 }
1153
1154 pub fn trans_place_projection<'a, 'tcx: 'a>(
1155     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1156     base: CPlace<'tcx>,
1157     projection: &Option<Box<Projection<'tcx>>>,
1158 ) -> CPlace<'tcx> {
1159     let projection = if let Some(projection) = projection {
1160         projection
1161     } else {
1162         return base;
1163     };
1164
1165     let base = trans_place_projection(fx, base, &projection.base);
1166
1167     match projection.elem {
1168         ProjectionElem::Deref => base.place_deref(fx),
1169         ProjectionElem::Field(field, _ty) => base.place_field(fx, field),
1170         ProjectionElem::Index(local) => {
1171             let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
1172             base.place_index(fx, index)
1173         }
1174         ProjectionElem::ConstantIndex {
1175             offset,
1176             min_length: _,
1177             from_end,
1178         } => {
1179             let index = if !from_end {
1180                 fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
1181             } else {
1182                 let len = codegen_array_len(fx, base);
1183                 fx.bcx.ins().iadd_imm(len, -(offset as i64))
1184             };
1185             base.place_index(fx, index)
1186         }
1187         ProjectionElem::Subslice { from, to } => {
1188             // These indices are generated by slice patterns.
1189             // slice[from:-to] in Python terms.
1190
1191             match base.layout().ty.sty {
1192                 ty::Array(elem_ty, len) => {
1193                     let elem_layout = fx.layout_of(elem_ty);
1194                     let ptr = base.to_addr(fx);
1195                     let len = crate::constant::force_eval_const(fx, len).unwrap_usize(fx.tcx);
1196                     CPlace::for_addr(
1197                         fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
1198                         fx.layout_of(fx.tcx.mk_array(elem_ty, len - from as u64 - to as u64)),
1199                     )
1200                 }
1201                 ty::Slice(elem_ty) => {
1202                     let elem_layout = fx.layout_of(elem_ty);
1203                     let (ptr, len) = base.to_addr_maybe_unsized(fx);
1204                     let len = len.unwrap();
1205                     CPlace::for_addr_with_extra(
1206                         fx.bcx.ins().iadd_imm(ptr, elem_layout.size.bytes() as i64 * from as i64),
1207                         fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
1208                         base.layout(),
1209                     )
1210                 }
1211                 _ => unreachable!(),
1212             }
1213         }
1214         ProjectionElem::Downcast(_adt_def, variant) => base.downcast_variant(fx, variant),
1215     }
1216 }
1217
1218 pub fn trans_operand<'a, 'tcx>(
1219     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
1220     operand: &Operand<'tcx>,
1221 ) -> CValue<'tcx> {
1222     match operand {
1223         Operand::Move(place) | Operand::Copy(place) => {
1224             let cplace = trans_place(fx, place);
1225             cplace.to_cvalue(fx)
1226         }
1227         Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),
1228     }
1229 }