compiler/rustc_codegen_llvm/src/abi.rs

   1 use crate::builder::Builder;
   2 use crate::context::CodegenCx;
   3 use crate::llvm::{self, AttributePlace};
   4 use crate::type_::Type;
   5 use crate::type_of::LayoutLlvmExt;
   6 use crate::value::Value;
   7
   8 use rustc_codegen_ssa::mir::operand::OperandValue;
   9 use rustc_codegen_ssa::mir::place::PlaceRef;
  10 use rustc_codegen_ssa::traits::*;
  11 use rustc_codegen_ssa::MemFlags;
  12 use rustc_middle::bug;
  13 pub use rustc_middle::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};
  14 use rustc_middle::ty::Ty;
  15 use rustc_target::abi::call::ArgAbi;
  16 pub use rustc_target::abi::call::*;
  17 use rustc_target::abi::{self, HasDataLayout, Int, LayoutOf};
  18 pub use rustc_target::spec::abi::Abi;
  19
  20 use libc::c_uint;
  21
  22 macro_rules! for_each_kind {
  23     ($flags: ident, $f: ident, $($kind: ident),+) => ({
  24         $(if $flags.contains(ArgAttribute::$kind) { $f(llvm::Attribute::$kind) })+
  25     })
  26 }
  27
  28 trait ArgAttributeExt {
  29     fn for_each_kind<F>(&self, f: F)
  30     where
  31         F: FnMut(llvm::Attribute);
  32 }
  33
  34 impl ArgAttributeExt for ArgAttribute {
  35     fn for_each_kind<F>(&self, mut f: F)
  36     where
  37         F: FnMut(llvm::Attribute),
  38     {
  39         for_each_kind!(self, f, NoAlias, NoCapture, NonNull, ReadOnly, InReg)
  40     }
  41 }
  42
  43 pub trait ArgAttributesExt {
  44     fn apply_attrs_to_llfn(&self, idx: AttributePlace, llfn: &Value);
  45     fn apply_attrs_to_callsite(&self, idx: AttributePlace, callsite: &Value);
  46 }
  47
  48 impl ArgAttributesExt for ArgAttributes {
  49     fn apply_attrs_to_llfn(&self, idx: AttributePlace, llfn: &Value) {
  50         let mut regular = self.regular;
  51         unsafe {
  52             let deref = self.pointee_size.bytes();
  53             if deref != 0 {
  54                 if regular.contains(ArgAttribute::NonNull) {
  55                     llvm::LLVMRustAddDereferenceableAttr(llfn, idx.as_uint(), deref);
  56                 } else {
  57                     llvm::LLVMRustAddDereferenceableOrNullAttr(llfn, idx.as_uint(), deref);
  58                 }
  59                 regular -= ArgAttribute::NonNull;
  60             }
  61             if let Some(align) = self.pointee_align {
  62                 llvm::LLVMRustAddAlignmentAttr(llfn, idx.as_uint(), align.bytes() as u32);
  63             }
  64             regular.for_each_kind(|attr| attr.apply_llfn(idx, llfn));
  65             match self.arg_ext {
  66                 ArgExtension::None => {}
  67                 ArgExtension::Zext => {
  68                     llvm::Attribute::ZExt.apply_llfn(idx, llfn);
  69                 }
  70                 ArgExtension::Sext => {
  71                     llvm::Attribute::SExt.apply_llfn(idx, llfn);
  72                 }
  73             }
  74         }
  75     }
  76
  77     fn apply_attrs_to_callsite(&self, idx: AttributePlace, callsite: &Value) {
  78         let mut regular = self.regular;
  79         unsafe {
  80             let deref = self.pointee_size.bytes();
  81             if deref != 0 {
  82                 if regular.contains(ArgAttribute::NonNull) {
  83                     llvm::LLVMRustAddDereferenceableCallSiteAttr(callsite, idx.as_uint(), deref);
  84                 } else {
  85                     llvm::LLVMRustAddDereferenceableOrNullCallSiteAttr(
  86                         callsite,
  87                         idx.as_uint(),
  88                         deref,
  89                     );
  90                 }
  91                 regular -= ArgAttribute::NonNull;
  92             }
  93             if let Some(align) = self.pointee_align {
  94                 llvm::LLVMRustAddAlignmentCallSiteAttr(
  95                     callsite,
  96                     idx.as_uint(),
  97                     align.bytes() as u32,
  98                 );
  99             }
 100             regular.for_each_kind(|attr| attr.apply_callsite(idx, callsite));
 101             match self.arg_ext {
 102                 ArgExtension::None => {}
 103                 ArgExtension::Zext => {
 104                     llvm::Attribute::ZExt.apply_callsite(idx, callsite);
 105                 }
 106                 ArgExtension::Sext => {
 107                     llvm::Attribute::SExt.apply_callsite(idx, callsite);
 108                 }
 109             }
 110         }
 111     }
 112 }
 113
 114 pub trait LlvmType {
 115     fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type;
 116 }
 117
 118 impl LlvmType for Reg {
 119     fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type {
 120         match self.kind {
 121             RegKind::Integer => cx.type_ix(self.size.bits()),
 122             RegKind::Float => match self.size.bits() {
 123                 32 => cx.type_f32(),
 124                 64 => cx.type_f64(),
 125                 _ => bug!("unsupported float: {:?}", self),
 126             },
 127             RegKind::Vector => cx.type_vector(cx.type_i8(), self.size.bytes()),
 128         }
 129     }
 130 }
 131
 132 impl LlvmType for CastTarget {
 133     fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type {
 134         let rest_ll_unit = self.rest.unit.llvm_type(cx);
 135         let (rest_count, rem_bytes) = if self.rest.unit.size.bytes() == 0 {
 136             (0, 0)
 137         } else {
 138             (
 139                 self.rest.total.bytes() / self.rest.unit.size.bytes(),
 140                 self.rest.total.bytes() % self.rest.unit.size.bytes(),
 141             )
 142         };
 143
 144         if self.prefix.iter().all(|x| x.is_none()) {
 145             // Simplify to a single unit when there is no prefix and size <= unit size
 146             if self.rest.total <= self.rest.unit.size {
 147                 return rest_ll_unit;
 148             }
 149
 150             // Simplify to array when all chunks are the same size and type
 151             if rem_bytes == 0 {
 152                 return cx.type_array(rest_ll_unit, rest_count);
 153             }
 154         }
 155
 156         // Create list of fields in the main structure
 157         let mut args: Vec<_> = self
 158             .prefix
 159             .iter()
 160             .flat_map(|option_kind| {
 161                 option_kind.map(|kind| Reg { kind, size: self.prefix_chunk_size }.llvm_type(cx))
 162             })
 163             .chain((0..rest_count).map(|_| rest_ll_unit))
 164             .collect();
 165
 166         // Append final integer
 167         if rem_bytes != 0 {
 168             // Only integers can be really split further.
 169             assert_eq!(self.rest.unit.kind, RegKind::Integer);
 170             args.push(cx.type_ix(rem_bytes * 8));
 171         }
 172
 173         cx.type_struct(&args, false)
 174     }
 175 }
 176
 177 pub trait ArgAbiExt<'ll, 'tcx> {
 178     fn memory_ty(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type;
 179     fn store(
 180         &self,
 181         bx: &mut Builder<'_, 'll, 'tcx>,
 182         val: &'ll Value,
 183         dst: PlaceRef<'tcx, &'ll Value>,
 184     );
 185     fn store_fn_arg(
 186         &self,
 187         bx: &mut Builder<'_, 'll, 'tcx>,
 188         idx: &mut usize,
 189         dst: PlaceRef<'tcx, &'ll Value>,
 190     );
 191 }
 192
 193 impl ArgAbiExt<'ll, 'tcx> for ArgAbi<'tcx, Ty<'tcx>> {
 194     /// Gets the LLVM type for a place of the original Rust type of
 195     /// this argument/return, i.e., the result of `type_of::type_of`.
 196     fn memory_ty(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type {
 197         self.layout.llvm_type(cx)
 198     }
 199
 200     /// Stores a direct/indirect value described by this ArgAbi into a
 201     /// place for the original Rust type of this argument/return.
 202     /// Can be used for both storing formal arguments into Rust variables
 203     /// or results of call/invoke instructions into their destinations.
 204     fn store(
 205         &self,
 206         bx: &mut Builder<'_, 'll, 'tcx>,
 207         val: &'ll Value,
 208         dst: PlaceRef<'tcx, &'ll Value>,
 209     ) {
 210         if self.is_ignore() {
 211             return;
 212         }
 213         if self.is_sized_indirect() {
 214             OperandValue::Ref(val, None, self.layout.align.abi).store(bx, dst)
 215         } else if self.is_unsized_indirect() {
 216             bug!("unsized `ArgAbi` must be handled through `store_fn_arg`");
 217         } else if let PassMode::Cast(cast) = self.mode {
 218             // FIXME(eddyb): Figure out when the simpler Store is safe, clang
 219             // uses it for i16 -> {i8, i8}, but not for i24 -> {i8, i8, i8}.
 220             let can_store_through_cast_ptr = false;
 221             if can_store_through_cast_ptr {
 222                 let cast_ptr_llty = bx.type_ptr_to(cast.llvm_type(bx));
 223                 let cast_dst = bx.pointercast(dst.llval, cast_ptr_llty);
 224                 bx.store(val, cast_dst, self.layout.align.abi);
 225             } else {
 226                 // The actual return type is a struct, but the ABI
 227                 // adaptation code has cast it into some scalar type.  The
 228                 // code that follows is the only reliable way I have
 229                 // found to do a transform like i64 -> {i32,i32}.
 230                 // Basically we dump the data onto the stack then memcpy it.
 231                 //
 232                 // Other approaches I tried:
 233                 // - Casting rust ret pointer to the foreign type and using Store
 234                 //   is (a) unsafe if size of foreign type > size of rust type and
 235                 //   (b) runs afoul of strict aliasing rules, yielding invalid
 236                 //   assembly under -O (specifically, the store gets removed).
 237                 // - Truncating foreign type to correct integral type and then
 238                 //   bitcasting to the struct type yields invalid cast errors.
 239
 240                 // We instead thus allocate some scratch space...
 241                 let scratch_size = cast.size(bx);
 242                 let scratch_align = cast.align(bx);
 243                 let llscratch = bx.alloca(cast.llvm_type(bx), scratch_align);
 244                 bx.lifetime_start(llscratch, scratch_size);
 245
 246                 // ... where we first store the value...
 247                 bx.store(val, llscratch, scratch_align);
 248
 249                 // ... and then memcpy it to the intended destination.
 250                 bx.memcpy(
 251                     dst.llval,
 252                     self.layout.align.abi,
 253                     llscratch,
 254                     scratch_align,
 255                     bx.const_usize(self.layout.size.bytes()),
 256                     MemFlags::empty(),
 257                 );
 258
 259                 bx.lifetime_end(llscratch, scratch_size);
 260             }
 261         } else {
 262             OperandValue::Immediate(val).store(bx, dst);
 263         }
 264     }
 265
 266     fn store_fn_arg(
 267         &self,
 268         bx: &mut Builder<'a, 'll, 'tcx>,
 269         idx: &mut usize,
 270         dst: PlaceRef<'tcx, &'ll Value>,
 271     ) {
 272         let mut next = || {
 273             let val = llvm::get_param(bx.llfn(), *idx as c_uint);
 274             *idx += 1;
 275             val
 276         };
 277         match self.mode {
 278             PassMode::Ignore => {}
 279             PassMode::Pair(..) => {
 280                 OperandValue::Pair(next(), next()).store(bx, dst);
 281             }
 282             PassMode::Indirect { attrs: _, extra_attrs: Some(_), on_stack: _ } => {
 283                 OperandValue::Ref(next(), Some(next()), self.layout.align.abi).store(bx, dst);
 284             }
 285             PassMode::Direct(_)
 286             | PassMode::Indirect { attrs: _, extra_attrs: None, on_stack: _ }
 287             | PassMode::Cast(_) => {
 288                 let next_arg = next();
 289                 self.store(bx, next_arg, dst);
 290             }
 291         }
 292     }
 293 }
 294
 295 impl ArgAbiMethods<'tcx> for Builder<'a, 'll, 'tcx> {
 296     fn store_fn_arg(
 297         &mut self,
 298         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 299         idx: &mut usize,
 300         dst: PlaceRef<'tcx, Self::Value>,
 301     ) {
 302         arg_abi.store_fn_arg(self, idx, dst)
 303     }
 304     fn store_arg(
 305         &mut self,
 306         arg_abi: &ArgAbi<'tcx, Ty<'tcx>>,
 307         val: &'ll Value,
 308         dst: PlaceRef<'tcx, &'ll Value>,
 309     ) {
 310         arg_abi.store(self, val, dst)
 311     }
 312     fn arg_memory_ty(&self, arg_abi: &ArgAbi<'tcx, Ty<'tcx>>) -> &'ll Type {
 313         arg_abi.memory_ty(self)
 314     }
 315 }
 316
 317 pub trait FnAbiLlvmExt<'tcx> {
 318     fn llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type;
 319     fn ptr_to_llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type;
 320     fn llvm_cconv(&self) -> llvm::CallConv;
 321     fn apply_attrs_llfn(&self, cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value);
 322     fn apply_attrs_callsite(&self, bx: &mut Builder<'a, 'll, 'tcx>, callsite: &'ll Value);
 323 }
 324
 325 impl<'tcx> FnAbiLlvmExt<'tcx> for FnAbi<'tcx, Ty<'tcx>> {
 326     fn llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type {
 327         let args_capacity: usize = self.args.iter().map(|arg|
 328             if arg.pad.is_some() { 1 } else { 0 } +
 329             if let PassMode::Pair(_, _) = arg.mode { 2 } else { 1 }
 330         ).sum();
 331         let mut llargument_tys = Vec::with_capacity(
 332             if let PassMode::Indirect { .. } = self.ret.mode { 1 } else { 0 } + args_capacity,
 333         );
 334
 335         let llreturn_ty = match self.ret.mode {
 336             PassMode::Ignore => cx.type_void(),
 337             PassMode::Direct(_) | PassMode::Pair(..) => self.ret.layout.immediate_llvm_type(cx),
 338             PassMode::Cast(cast) => cast.llvm_type(cx),
 339             PassMode::Indirect { .. } => {
 340                 llargument_tys.push(cx.type_ptr_to(self.ret.memory_ty(cx)));
 341                 cx.type_void()
 342             }
 343         };
 344
 345         for arg in &self.args {
 346             // add padding
 347             if let Some(ty) = arg.pad {
 348                 llargument_tys.push(ty.llvm_type(cx));
 349             }
 350
 351             let llarg_ty = match arg.mode {
 352                 PassMode::Ignore => continue,
 353                 PassMode::Direct(_) => arg.layout.immediate_llvm_type(cx),
 354                 PassMode::Pair(..) => {
 355                     llargument_tys.push(arg.layout.scalar_pair_element_llvm_type(cx, 0, true));
 356                     llargument_tys.push(arg.layout.scalar_pair_element_llvm_type(cx, 1, true));
 357                     continue;
 358                 }
 359                 PassMode::Indirect { attrs: _, extra_attrs: Some(_), on_stack: _ } => {
 360                     let ptr_ty = cx.tcx.mk_mut_ptr(arg.layout.ty);
 361                     let ptr_layout = cx.layout_of(ptr_ty);
 362                     llargument_tys.push(ptr_layout.scalar_pair_element_llvm_type(cx, 0, true));
 363                     llargument_tys.push(ptr_layout.scalar_pair_element_llvm_type(cx, 1, true));
 364                     continue;
 365                 }
 366                 PassMode::Cast(cast) => cast.llvm_type(cx),
 367                 PassMode::Indirect { attrs: _, extra_attrs: None, on_stack: _ } => {
 368                     cx.type_ptr_to(arg.memory_ty(cx))
 369                 }
 370             };
 371             llargument_tys.push(llarg_ty);
 372         }
 373
 374         if self.c_variadic {
 375             cx.type_variadic_func(&llargument_tys, llreturn_ty)
 376         } else {
 377             cx.type_func(&llargument_tys, llreturn_ty)
 378         }
 379     }
 380
 381     fn ptr_to_llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type {
 382         unsafe {
 383             llvm::LLVMPointerType(
 384                 self.llvm_type(cx),
 385                 cx.data_layout().instruction_address_space.0 as c_uint,
 386             )
 387         }
 388     }
 389
 390     fn llvm_cconv(&self) -> llvm::CallConv {
 391         match self.conv {
 392             Conv::C | Conv::Rust | Conv::CCmseNonSecureCall => llvm::CCallConv,
 393             Conv::AmdGpuKernel => llvm::AmdGpuKernel,
 394             Conv::AvrInterrupt => llvm::AvrInterrupt,
 395             Conv::AvrNonBlockingInterrupt => llvm::AvrNonBlockingInterrupt,
 396             Conv::ArmAapcs => llvm::ArmAapcsCallConv,
 397             Conv::Msp430Intr => llvm::Msp430Intr,
 398             Conv::PtxKernel => llvm::PtxKernel,
 399             Conv::X86Fastcall => llvm::X86FastcallCallConv,
 400             Conv::X86Intr => llvm::X86_Intr,
 401             Conv::X86Stdcall => llvm::X86StdcallCallConv,
 402             Conv::X86ThisCall => llvm::X86_ThisCall,
 403             Conv::X86VectorCall => llvm::X86_VectorCall,
 404             Conv::X86_64SysV => llvm::X86_64_SysV,
 405             Conv::X86_64Win64 => llvm::X86_64_Win64,
 406         }
 407     }
 408
 409     fn apply_attrs_llfn(&self, cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value) {
 410         // FIXME(eddyb) can this also be applied to callsites?
 411         if self.ret.layout.abi.is_uninhabited() {
 412             llvm::Attribute::NoReturn.apply_llfn(llvm::AttributePlace::Function, llfn);
 413         }
 414
 415         // FIXME(eddyb, wesleywiser): apply this to callsites as well?
 416         if !self.can_unwind {
 417             llvm::Attribute::NoUnwind.apply_llfn(llvm::AttributePlace::Function, llfn);
 418         }
 419
 420         let mut i = 0;
 421         let mut apply = |attrs: &ArgAttributes| {
 422             attrs.apply_attrs_to_llfn(llvm::AttributePlace::Argument(i), llfn);
 423             i += 1;
 424             i - 1
 425         };
 426         match self.ret.mode {
 427             PassMode::Direct(ref attrs) => {
 428                 attrs.apply_attrs_to_llfn(llvm::AttributePlace::ReturnValue, llfn);
 429             }
 430             PassMode::Indirect { ref attrs, extra_attrs: _, on_stack } => {
 431                 assert!(!on_stack);
 432                 let i = apply(attrs);
 433                 unsafe {
 434                     llvm::LLVMRustAddStructRetAttr(
 435                         llfn,
 436                         llvm::AttributePlace::Argument(i).as_uint(),
 437                         self.ret.layout.llvm_type(cx),
 438                     );
 439                 }
 440             }
 441             _ => {}
 442         }
 443         for arg in &self.args {
 444             if arg.pad.is_some() {
 445                 apply(&ArgAttributes::new());
 446             }
 447             match arg.mode {
 448                 PassMode::Ignore => {}
 449                 PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: true } => {
 450                     let i = apply(attrs);
 451                     unsafe {
 452                         llvm::LLVMRustAddByValAttr(
 453                             llfn,
 454                             llvm::AttributePlace::Argument(i).as_uint(),
 455                             arg.layout.llvm_type(cx),
 456                         );
 457                     }
 458                 }
 459                 PassMode::Direct(ref attrs)
 460                 | PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: false } => {
 461                     apply(attrs);
 462                 }
 463                 PassMode::Indirect { ref attrs, extra_attrs: Some(ref extra_attrs), on_stack } => {
 464                     assert!(!on_stack);
 465                     apply(attrs);
 466                     apply(extra_attrs);
 467                 }
 468                 PassMode::Pair(ref a, ref b) => {
 469                     apply(a);
 470                     apply(b);
 471                 }
 472                 PassMode::Cast(_) => {
 473                     apply(&ArgAttributes::new());
 474                 }
 475             }
 476         }
 477     }
 478
 479     fn apply_attrs_callsite(&self, bx: &mut Builder<'a, 'll, 'tcx>, callsite: &'ll Value) {
 480         // FIXME(wesleywiser, eddyb): We should apply `nounwind` and `noreturn` as appropriate to this callsite.
 481
 482         let mut i = 0;
 483         let mut apply = |attrs: &ArgAttributes| {
 484             attrs.apply_attrs_to_callsite(llvm::AttributePlace::Argument(i), callsite);
 485             i += 1;
 486             i - 1
 487         };
 488         match self.ret.mode {
 489             PassMode::Direct(ref attrs) => {
 490                 attrs.apply_attrs_to_callsite(llvm::AttributePlace::ReturnValue, callsite);
 491             }
 492             PassMode::Indirect { ref attrs, extra_attrs: _, on_stack } => {
 493                 assert!(!on_stack);
 494                 let i = apply(attrs);
 495                 unsafe {
 496                     llvm::LLVMRustAddStructRetCallSiteAttr(
 497                         callsite,
 498                         llvm::AttributePlace::Argument(i).as_uint(),
 499                         self.ret.layout.llvm_type(bx),
 500                     );
 501                 }
 502             }
 503             _ => {}
 504         }
 505         if let abi::Abi::Scalar(ref scalar) = self.ret.layout.abi {
 506             // If the value is a boolean, the range is 0..2 and that ultimately
 507             // become 0..0 when the type becomes i1, which would be rejected
 508             // by the LLVM verifier.
 509             if let Int(..) = scalar.value {
 510                 if !scalar.is_bool() {
 511                     let range = scalar.valid_range_exclusive(bx);
 512                     if range.start != range.end {
 513                         bx.range_metadata(callsite, range);
 514                     }
 515                 }
 516             }
 517         }
 518         for arg in &self.args {
 519             if arg.pad.is_some() {
 520                 apply(&ArgAttributes::new());
 521             }
 522             match arg.mode {
 523                 PassMode::Ignore => {}
 524                 PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: true } => {
 525                     let i = apply(attrs);
 526                     unsafe {
 527                         llvm::LLVMRustAddByValCallSiteAttr(
 528                             callsite,
 529                             llvm::AttributePlace::Argument(i).as_uint(),
 530                             arg.layout.llvm_type(bx),
 531                         );
 532                     }
 533                 }
 534                 PassMode::Direct(ref attrs)
 535                 | PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: false } => {
 536                     apply(attrs);
 537                 }
 538                 PassMode::Indirect {
 539                     ref attrs,
 540                     extra_attrs: Some(ref extra_attrs),
 541                     on_stack: _,
 542                 } => {
 543                     apply(attrs);
 544                     apply(extra_attrs);
 545                 }
 546                 PassMode::Pair(ref a, ref b) => {
 547                     apply(a);
 548                     apply(b);
 549                 }
 550                 PassMode::Cast(_) => {
 551                     apply(&ArgAttributes::new());
 552                 }
 553             }
 554         }
 555
 556         let cconv = self.llvm_cconv();
 557         if cconv != llvm::CCallConv {
 558             llvm::SetInstructionCallConv(callsite, cconv);
 559         }
 560
 561         if self.conv == Conv::CCmseNonSecureCall {
 562             // This will probably get ignored on all targets but those supporting the TrustZone-M
 563             // extension (thumbv8m targets).
 564             unsafe {
 565                 llvm::AddCallSiteAttrString(
 566                     callsite,
 567                     llvm::AttributePlace::Function,
 568                     cstr::cstr!("cmse_nonsecure_call"),
 569                 );
 570             }
 571         }
 572     }
 573 }
 574
 575 impl AbiBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
 576     fn apply_attrs_callsite(&mut self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>, callsite: Self::Value) {
 577         fn_abi.apply_attrs_callsite(self, callsite)
 578     }
 579
 580     fn get_param(&self, index: usize) -> Self::Value {
 581         llvm::get_param(self.llfn(), index as c_uint)
 582     }
 583 }