src/librustc_codegen_llvm/builder.rs

   1 use crate::common::Funclet;
   2 use crate::context::CodegenCx;
   3 use crate::llvm::{self, BasicBlock, False};
   4 use crate::llvm::{AtomicOrdering, AtomicRmwBinOp, SynchronizationScope};
   5 use crate::type_::Type;
   6 use crate::type_of::LayoutLlvmExt;
   7 use crate::value::Value;
   8 use libc::{c_char, c_uint};
   9 use log::debug;
  10 use rustc_codegen_ssa::base::to_immediate;
  11 use rustc_codegen_ssa::common::{IntPredicate, RealPredicate, TypeKind};
  12 use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
  13 use rustc_codegen_ssa::mir::place::PlaceRef;
  14 use rustc_codegen_ssa::traits::*;
  15 use rustc_codegen_ssa::MemFlags;
  16 use rustc_data_structures::const_cstr;
  17 use rustc_data_structures::small_c_str::SmallCStr;
  18 use rustc_hir::def_id::DefId;
  19 use rustc_middle::ty::layout::TyAndLayout;
  20 use rustc_middle::ty::{self, Ty, TyCtxt};
  21 use rustc_session::config::{self, Sanitizer};
  22 use rustc_target::abi::{self, Align, Size};
  23 use rustc_target::spec::{HasTargetSpec, Target};
  24 use std::borrow::Cow;
  25 use std::ffi::CStr;
  26 use std::iter::TrustedLen;
  27 use std::ops::{Deref, Range};
  28 use std::ptr;
  29
  30 // All Builders must have an llfn associated with them
  31 #[must_use]
  32 pub struct Builder<'a, 'll, 'tcx> {
  33     pub llbuilder: &'ll mut llvm::Builder<'ll>,
  34     pub cx: &'a CodegenCx<'ll, 'tcx>,
  35 }
  36
  37 impl Drop for Builder<'a, 'll, 'tcx> {
  38     fn drop(&mut self) {
  39         unsafe {
  40             llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
  41         }
  42     }
  43 }
  44
  45 // FIXME(eddyb) use a checked constructor when they become `const fn`.
  46 const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
  47
  48 /// Empty string, to be used where LLVM expects an instruction name, indicating
  49 /// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
  50 // FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
  51 const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
  52
  53 impl BackendTypes for Builder<'_, 'll, 'tcx> {
  54     type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
  55     type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
  56     type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
  57     type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
  58     type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;
  59
  60     type DIScope = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIScope;
  61     type DIVariable = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIVariable;
  62 }
  63
  64 impl abi::HasDataLayout for Builder<'_, '_, '_> {
  65     fn data_layout(&self) -> &abi::TargetDataLayout {
  66         self.cx.data_layout()
  67     }
  68 }
  69
  70 impl ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
  71     fn tcx(&self) -> TyCtxt<'tcx> {
  72         self.cx.tcx
  73     }
  74 }
  75
  76 impl ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
  77     fn param_env(&self) -> ty::ParamEnv<'tcx> {
  78         self.cx.param_env()
  79     }
  80 }
  81
  82 impl HasTargetSpec for Builder<'_, '_, 'tcx> {
  83     fn target_spec(&self) -> &Target {
  84         &self.cx.target_spec()
  85     }
  86 }
  87
  88 impl abi::LayoutOf for Builder<'_, '_, 'tcx> {
  89     type Ty = Ty<'tcx>;
  90     type TyAndLayout = TyAndLayout<'tcx>;
  91
  92     fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
  93         self.cx.layout_of(ty)
  94     }
  95 }
  96
  97 impl Deref for Builder<'_, 'll, 'tcx> {
  98     type Target = CodegenCx<'ll, 'tcx>;
  99
 100     fn deref(&self) -> &Self::Target {
 101         self.cx
 102     }
 103 }
 104
 105 impl HasCodegen<'tcx> for Builder<'_, 'll, 'tcx> {
 106     type CodegenCx = CodegenCx<'ll, 'tcx>;
 107 }
 108
 109 macro_rules! builder_methods_for_value_instructions {
 110     ($($name:ident($($arg:ident),*) => $llvm_capi:ident),+ $(,)?) => {
 111         $(fn $name(&mut self, $($arg: &'ll Value),*) -> &'ll Value {
 112             unsafe {
 113                 llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
 114             }
 115         })+
 116     }
 117 }
 118
 119 impl BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
 120     fn new_block<'b>(cx: &'a CodegenCx<'ll, 'tcx>, llfn: &'ll Value, name: &'b str) -> Self {
 121         let mut bx = Builder::with_cx(cx);
 122         let llbb = unsafe {
 123             let name = SmallCStr::new(name);
 124             llvm::LLVMAppendBasicBlockInContext(cx.llcx, llfn, name.as_ptr())
 125         };
 126         bx.position_at_end(llbb);
 127         bx
 128     }
 129
 130     fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
 131         // Create a fresh builder from the crate context.
 132         let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
 133         Builder { llbuilder, cx }
 134     }
 135
 136     fn build_sibling_block(&self, name: &str) -> Self {
 137         Builder::new_block(self.cx, self.llfn(), name)
 138     }
 139
 140     fn llbb(&self) -> &'ll BasicBlock {
 141         unsafe { llvm::LLVMGetInsertBlock(self.llbuilder) }
 142     }
 143
 144     fn position_at_end(&mut self, llbb: &'ll BasicBlock) {
 145         unsafe {
 146             llvm::LLVMPositionBuilderAtEnd(self.llbuilder, llbb);
 147         }
 148     }
 149
 150     fn ret_void(&mut self) {
 151         unsafe {
 152             llvm::LLVMBuildRetVoid(self.llbuilder);
 153         }
 154     }
 155
 156     fn ret(&mut self, v: &'ll Value) {
 157         unsafe {
 158             llvm::LLVMBuildRet(self.llbuilder, v);
 159         }
 160     }
 161
 162     fn br(&mut self, dest: &'ll BasicBlock) {
 163         unsafe {
 164             llvm::LLVMBuildBr(self.llbuilder, dest);
 165         }
 166     }
 167
 168     fn cond_br(
 169         &mut self,
 170         cond: &'ll Value,
 171         then_llbb: &'ll BasicBlock,
 172         else_llbb: &'ll BasicBlock,
 173     ) {
 174         unsafe {
 175             llvm::LLVMBuildCondBr(self.llbuilder, cond, then_llbb, else_llbb);
 176         }
 177     }
 178
 179     fn switch(
 180         &mut self,
 181         v: &'ll Value,
 182         else_llbb: &'ll BasicBlock,
 183         cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)> + TrustedLen,
 184     ) {
 185         let switch =
 186             unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };
 187         for (on_val, dest) in cases {
 188             let on_val = self.const_uint_big(self.val_ty(v), on_val);
 189             unsafe { llvm::LLVMAddCase(switch, on_val, dest) }
 190         }
 191     }
 192
 193     fn invoke(
 194         &mut self,
 195         llfn: &'ll Value,
 196         args: &[&'ll Value],
 197         then: &'ll BasicBlock,
 198         catch: &'ll BasicBlock,
 199         funclet: Option<&Funclet<'ll>>,
 200     ) -> &'ll Value {
 201         debug!("invoke {:?} with args ({:?})", llfn, args);
 202
 203         let args = self.check_call("invoke", llfn, args);
 204         let bundle = funclet.map(|funclet| funclet.bundle());
 205         let bundle = bundle.as_ref().map(|b| &*b.raw);
 206
 207         unsafe {
 208             llvm::LLVMRustBuildInvoke(
 209                 self.llbuilder,
 210                 llfn,
 211                 args.as_ptr(),
 212                 args.len() as c_uint,
 213                 then,
 214                 catch,
 215                 bundle,
 216                 UNNAMED,
 217             )
 218         }
 219     }
 220
 221     fn unreachable(&mut self) {
 222         unsafe {
 223             llvm::LLVMBuildUnreachable(self.llbuilder);
 224         }
 225     }
 226
 227     builder_methods_for_value_instructions! {
 228         add(a, b) => LLVMBuildAdd,
 229         fadd(a, b) => LLVMBuildFAdd,
 230         sub(a, b) => LLVMBuildSub,
 231         fsub(a, b) => LLVMBuildFSub,
 232         mul(a, b) => LLVMBuildMul,
 233         fmul(a, b) => LLVMBuildFMul,
 234         udiv(a, b) => LLVMBuildUDiv,
 235         exactudiv(a, b) => LLVMBuildExactUDiv,
 236         sdiv(a, b) => LLVMBuildSDiv,
 237         exactsdiv(a, b) => LLVMBuildExactSDiv,
 238         fdiv(a, b) => LLVMBuildFDiv,
 239         urem(a, b) => LLVMBuildURem,
 240         srem(a, b) => LLVMBuildSRem,
 241         frem(a, b) => LLVMBuildFRem,
 242         shl(a, b) => LLVMBuildShl,
 243         lshr(a, b) => LLVMBuildLShr,
 244         ashr(a, b) => LLVMBuildAShr,
 245         and(a, b) => LLVMBuildAnd,
 246         or(a, b) => LLVMBuildOr,
 247         xor(a, b) => LLVMBuildXor,
 248         neg(x) => LLVMBuildNeg,
 249         fneg(x) => LLVMBuildFNeg,
 250         not(x) => LLVMBuildNot,
 251         unchecked_sadd(x, y) => LLVMBuildNSWAdd,
 252         unchecked_uadd(x, y) => LLVMBuildNUWAdd,
 253         unchecked_ssub(x, y) => LLVMBuildNSWSub,
 254         unchecked_usub(x, y) => LLVMBuildNUWSub,
 255         unchecked_smul(x, y) => LLVMBuildNSWMul,
 256         unchecked_umul(x, y) => LLVMBuildNUWMul,
 257     }
 258
 259     fn fadd_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 260         unsafe {
 261             let instr = llvm::LLVMBuildFAdd(self.llbuilder, lhs, rhs, UNNAMED);
 262             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
 263             instr
 264         }
 265     }
 266
 267     fn fsub_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 268         unsafe {
 269             let instr = llvm::LLVMBuildFSub(self.llbuilder, lhs, rhs, UNNAMED);
 270             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
 271             instr
 272         }
 273     }
 274
 275     fn fmul_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 276         unsafe {
 277             let instr = llvm::LLVMBuildFMul(self.llbuilder, lhs, rhs, UNNAMED);
 278             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
 279             instr
 280         }
 281     }
 282
 283     fn fdiv_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 284         unsafe {
 285             let instr = llvm::LLVMBuildFDiv(self.llbuilder, lhs, rhs, UNNAMED);
 286             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
 287             instr
 288         }
 289     }
 290
 291     fn frem_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 292         unsafe {
 293             let instr = llvm::LLVMBuildFRem(self.llbuilder, lhs, rhs, UNNAMED);
 294             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
 295             instr
 296         }
 297     }
 298
 299     fn checked_binop(
 300         &mut self,
 301         oop: OverflowOp,
 302         ty: Ty<'_>,
 303         lhs: Self::Value,
 304         rhs: Self::Value,
 305     ) -> (Self::Value, Self::Value) {
 306         use rustc_ast::ast::IntTy::*;
 307         use rustc_ast::ast::UintTy::*;
 308         use rustc_middle::ty::{Int, Uint};
 309
 310         let new_kind = match ty.kind {
 311             Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.ptr_width)),
 312             Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.ptr_width)),
 313             ref t @ (Uint(_) | Int(_)) => t.clone(),
 314             _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
 315         };
 316
 317         let name = match oop {
 318             OverflowOp::Add => match new_kind {
 319                 Int(I8) => "llvm.sadd.with.overflow.i8",
 320                 Int(I16) => "llvm.sadd.with.overflow.i16",
 321                 Int(I32) => "llvm.sadd.with.overflow.i32",
 322                 Int(I64) => "llvm.sadd.with.overflow.i64",
 323                 Int(I128) => "llvm.sadd.with.overflow.i128",
 324
 325                 Uint(U8) => "llvm.uadd.with.overflow.i8",
 326                 Uint(U16) => "llvm.uadd.with.overflow.i16",
 327                 Uint(U32) => "llvm.uadd.with.overflow.i32",
 328                 Uint(U64) => "llvm.uadd.with.overflow.i64",
 329                 Uint(U128) => "llvm.uadd.with.overflow.i128",
 330
 331                 _ => unreachable!(),
 332             },
 333             OverflowOp::Sub => match new_kind {
 334                 Int(I8) => "llvm.ssub.with.overflow.i8",
 335                 Int(I16) => "llvm.ssub.with.overflow.i16",
 336                 Int(I32) => "llvm.ssub.with.overflow.i32",
 337                 Int(I64) => "llvm.ssub.with.overflow.i64",
 338                 Int(I128) => "llvm.ssub.with.overflow.i128",
 339
 340                 Uint(U8) => "llvm.usub.with.overflow.i8",
 341                 Uint(U16) => "llvm.usub.with.overflow.i16",
 342                 Uint(U32) => "llvm.usub.with.overflow.i32",
 343                 Uint(U64) => "llvm.usub.with.overflow.i64",
 344                 Uint(U128) => "llvm.usub.with.overflow.i128",
 345
 346                 _ => unreachable!(),
 347             },
 348             OverflowOp::Mul => match new_kind {
 349                 Int(I8) => "llvm.smul.with.overflow.i8",
 350                 Int(I16) => "llvm.smul.with.overflow.i16",
 351                 Int(I32) => "llvm.smul.with.overflow.i32",
 352                 Int(I64) => "llvm.smul.with.overflow.i64",
 353                 Int(I128) => "llvm.smul.with.overflow.i128",
 354
 355                 Uint(U8) => "llvm.umul.with.overflow.i8",
 356                 Uint(U16) => "llvm.umul.with.overflow.i16",
 357                 Uint(U32) => "llvm.umul.with.overflow.i32",
 358                 Uint(U64) => "llvm.umul.with.overflow.i64",
 359                 Uint(U128) => "llvm.umul.with.overflow.i128",
 360
 361                 _ => unreachable!(),
 362             },
 363         };
 364
 365         let intrinsic = self.get_intrinsic(&name);
 366         let res = self.call(intrinsic, &[lhs, rhs], None);
 367         (self.extract_value(res, 0), self.extract_value(res, 1))
 368     }
 369
 370     fn alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
 371         let mut bx = Builder::with_cx(self.cx);
 372         bx.position_at_start(unsafe { llvm::LLVMGetFirstBasicBlock(self.llfn()) });
 373         bx.dynamic_alloca(ty, align)
 374     }
 375
 376     fn dynamic_alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
 377         unsafe {
 378             let alloca = llvm::LLVMBuildAlloca(self.llbuilder, ty, UNNAMED);
 379             llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
 380             alloca
 381         }
 382     }
 383
 384     fn array_alloca(&mut self, ty: &'ll Type, len: &'ll Value, align: Align) -> &'ll Value {
 385         unsafe {
 386             let alloca = llvm::LLVMBuildArrayAlloca(self.llbuilder, ty, len, UNNAMED);
 387             llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
 388             alloca
 389         }
 390     }
 391
 392     fn load(&mut self, ptr: &'ll Value, align: Align) -> &'ll Value {
 393         unsafe {
 394             let load = llvm::LLVMBuildLoad(self.llbuilder, ptr, UNNAMED);
 395             llvm::LLVMSetAlignment(load, align.bytes() as c_uint);
 396             load
 397         }
 398     }
 399
 400     fn volatile_load(&mut self, ptr: &'ll Value) -> &'ll Value {
 401         unsafe {
 402             let load = llvm::LLVMBuildLoad(self.llbuilder, ptr, UNNAMED);
 403             llvm::LLVMSetVolatile(load, llvm::True);
 404             load
 405         }
 406     }
 407
 408     fn atomic_load(
 409         &mut self,
 410         ptr: &'ll Value,
 411         order: rustc_codegen_ssa::common::AtomicOrdering,
 412         size: Size,
 413     ) -> &'ll Value {
 414         unsafe {
 415             let load = llvm::LLVMRustBuildAtomicLoad(
 416                 self.llbuilder,
 417                 ptr,
 418                 UNNAMED,
 419                 AtomicOrdering::from_generic(order),
 420             );
 421             // LLVM requires the alignment of atomic loads to be at least the size of the type.
 422             llvm::LLVMSetAlignment(load, size.bytes() as c_uint);
 423             load
 424         }
 425     }
 426
 427     fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
 428         debug!("PlaceRef::load: {:?}", place);
 429
 430         assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
 431
 432         if place.layout.is_zst() {
 433             return OperandRef::new_zst(self, place.layout);
 434         }
 435
 436         fn scalar_load_metadata<'a, 'll, 'tcx>(
 437             bx: &mut Builder<'a, 'll, 'tcx>,
 438             load: &'ll Value,
 439             scalar: &abi::Scalar,
 440         ) {
 441             let vr = scalar.valid_range.clone();
 442             match scalar.value {
 443                 abi::Int(..) => {
 444                     let range = scalar.valid_range_exclusive(bx);
 445                     if range.start != range.end {
 446                         bx.range_metadata(load, range);
 447                     }
 448                 }
 449                 abi::Pointer if vr.start() < vr.end() && !vr.contains(&0) => {
 450                     bx.nonnull_metadata(load);
 451                 }
 452                 _ => {}
 453             }
 454         }
 455
 456         let val = if let Some(llextra) = place.llextra {
 457             OperandValue::Ref(place.llval, Some(llextra), place.align)
 458         } else if place.layout.is_llvm_immediate() {
 459             let mut const_llval = None;
 460             unsafe {
 461                 if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
 462                     if llvm::LLVMIsGlobalConstant(global) == llvm::True {
 463                         const_llval = llvm::LLVMGetInitializer(global);
 464                     }
 465                 }
 466             }
 467             let llval = const_llval.unwrap_or_else(|| {
 468                 let load = self.load(place.llval, place.align);
 469                 if let abi::Abi::Scalar(ref scalar) = place.layout.abi {
 470                     scalar_load_metadata(self, load, scalar);
 471                 }
 472                 load
 473             });
 474             OperandValue::Immediate(to_immediate(self, llval, place.layout))
 475         } else if let abi::Abi::ScalarPair(ref a, ref b) = place.layout.abi {
 476             let b_offset = a.value.size(self).align_to(b.value.align(self).abi);
 477
 478             let mut load = |i, scalar: &abi::Scalar, align| {
 479                 let llptr = self.struct_gep(place.llval, i as u64);
 480                 let load = self.load(llptr, align);
 481                 scalar_load_metadata(self, load, scalar);
 482                 if scalar.is_bool() { self.trunc(load, self.type_i1()) } else { load }
 483             };
 484
 485             OperandValue::Pair(
 486                 load(0, a, place.align),
 487                 load(1, b, place.align.restrict_for_offset(b_offset)),
 488             )
 489         } else {
 490             OperandValue::Ref(place.llval, None, place.align)
 491         };
 492
 493         OperandRef { val, layout: place.layout }
 494     }
 495
 496     fn write_operand_repeatedly(
 497         mut self,
 498         cg_elem: OperandRef<'tcx, &'ll Value>,
 499         count: u64,
 500         dest: PlaceRef<'tcx, &'ll Value>,
 501     ) -> Self {
 502         let zero = self.const_usize(0);
 503         let count = self.const_usize(count);
 504         let start = dest.project_index(&mut self, zero).llval;
 505         let end = dest.project_index(&mut self, count).llval;
 506
 507         let mut header_bx = self.build_sibling_block("repeat_loop_header");
 508         let mut body_bx = self.build_sibling_block("repeat_loop_body");
 509         let next_bx = self.build_sibling_block("repeat_loop_next");
 510
 511         self.br(header_bx.llbb());
 512         let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
 513
 514         let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
 515         header_bx.cond_br(keep_going, body_bx.llbb(), next_bx.llbb());
 516
 517         let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
 518         cg_elem
 519             .val
 520             .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
 521
 522         let next = body_bx.inbounds_gep(current, &[self.const_usize(1)]);
 523         body_bx.br(header_bx.llbb());
 524         header_bx.add_incoming_to_phi(current, next, body_bx.llbb());
 525
 526         next_bx
 527     }
 528
 529     fn range_metadata(&mut self, load: &'ll Value, range: Range<u128>) {
 530         if self.sess().target.target.arch == "amdgpu" {
 531             // amdgpu/LLVM does something weird and thinks a i64 value is
 532             // split into a v2i32, halving the bitwidth LLVM expects,
 533             // tripping an assertion. So, for now, just disable this
 534             // optimization.
 535             return;
 536         }
 537
 538         unsafe {
 539             let llty = self.cx.val_ty(load);
 540             let v = [
 541                 self.cx.const_uint_big(llty, range.start),
 542                 self.cx.const_uint_big(llty, range.end),
 543             ];
 544
 545             llvm::LLVMSetMetadata(
 546                 load,
 547                 llvm::MD_range as c_uint,
 548                 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
 549             );
 550         }
 551     }
 552
 553     fn nonnull_metadata(&mut self, load: &'ll Value) {
 554         unsafe {
 555             llvm::LLVMSetMetadata(
 556                 load,
 557                 llvm::MD_nonnull as c_uint,
 558                 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
 559             );
 560         }
 561     }
 562
 563     fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
 564         self.store_with_flags(val, ptr, align, MemFlags::empty())
 565     }
 566
 567     fn store_with_flags(
 568         &mut self,
 569         val: &'ll Value,
 570         ptr: &'ll Value,
 571         align: Align,
 572         flags: MemFlags,
 573     ) -> &'ll Value {
 574         debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
 575         let ptr = self.check_store(val, ptr);
 576         unsafe {
 577             let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
 578             let align =
 579                 if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
 580             llvm::LLVMSetAlignment(store, align);
 581             if flags.contains(MemFlags::VOLATILE) {
 582                 llvm::LLVMSetVolatile(store, llvm::True);
 583             }
 584             if flags.contains(MemFlags::NONTEMPORAL) {
 585                 // According to LLVM [1] building a nontemporal store must
 586                 // *always* point to a metadata value of the integer 1.
 587                 //
 588                 // [1]: http://llvm.org/docs/LangRef.html#store-instruction
 589                 let one = self.cx.const_i32(1);
 590                 let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
 591                 llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
 592             }
 593             store
 594         }
 595     }
 596
 597     fn atomic_store(
 598         &mut self,
 599         val: &'ll Value,
 600         ptr: &'ll Value,
 601         order: rustc_codegen_ssa::common::AtomicOrdering,
 602         size: Size,
 603     ) {
 604         debug!("Store {:?} -> {:?}", val, ptr);
 605         let ptr = self.check_store(val, ptr);
 606         unsafe {
 607             let store = llvm::LLVMRustBuildAtomicStore(
 608                 self.llbuilder,
 609                 val,
 610                 ptr,
 611                 AtomicOrdering::from_generic(order),
 612             );
 613             // LLVM requires the alignment of atomic stores to be at least the size of the type.
 614             llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
 615         }
 616     }
 617
 618     fn gep(&mut self, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
 619         unsafe {
 620             llvm::LLVMBuildGEP(
 621                 self.llbuilder,
 622                 ptr,
 623                 indices.as_ptr(),
 624                 indices.len() as c_uint,
 625                 UNNAMED,
 626             )
 627         }
 628     }
 629
 630     fn inbounds_gep(&mut self, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
 631         unsafe {
 632             llvm::LLVMBuildInBoundsGEP(
 633                 self.llbuilder,
 634                 ptr,
 635                 indices.as_ptr(),
 636                 indices.len() as c_uint,
 637                 UNNAMED,
 638             )
 639         }
 640     }
 641
 642     fn struct_gep(&mut self, ptr: &'ll Value, idx: u64) -> &'ll Value {
 643         assert_eq!(idx as c_uint as u64, idx);
 644         unsafe { llvm::LLVMBuildStructGEP(self.llbuilder, ptr, idx as c_uint, UNNAMED) }
 645     }
 646
 647     /* Casts */
 648     fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 649         unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
 650     }
 651
 652     fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 653         unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
 654     }
 655
 656     fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 657         unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
 658     }
 659
 660     fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 661         unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
 662     }
 663
 664     fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 665         unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
 666     }
 667
 668     fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 669         unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
 670     }
 671
 672     fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 673         unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
 674     }
 675
 676     fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 677         unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
 678     }
 679
 680     fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 681         unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
 682     }
 683
 684     fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 685         unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
 686     }
 687
 688     fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 689         unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
 690     }
 691
 692     fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
 693         unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
 694     }
 695
 696     fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
 697         unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
 698     }
 699
 700     /* Comparisons */
 701     fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 702         let op = llvm::IntPredicate::from_generic(op);
 703         unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
 704     }
 705
 706     fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
 707         unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
 708     }
 709
 710     /* Miscellaneous instructions */
 711     fn memcpy(
 712         &mut self,
 713         dst: &'ll Value,
 714         dst_align: Align,
 715         src: &'ll Value,
 716         src_align: Align,
 717         size: &'ll Value,
 718         flags: MemFlags,
 719     ) {
 720         if flags.contains(MemFlags::NONTEMPORAL) {
 721             // HACK(nox): This is inefficient but there is no nontemporal memcpy.
 722             let val = self.load(src, src_align);
 723             let ptr = self.pointercast(dst, self.type_ptr_to(self.val_ty(val)));
 724             self.store_with_flags(val, ptr, dst_align, flags);
 725             return;
 726         }
 727         let size = self.intcast(size, self.type_isize(), false);
 728         let is_volatile = flags.contains(MemFlags::VOLATILE);
 729         let dst = self.pointercast(dst, self.type_i8p());
 730         let src = self.pointercast(src, self.type_i8p());
 731         unsafe {
 732             llvm::LLVMRustBuildMemCpy(
 733                 self.llbuilder,
 734                 dst,
 735                 dst_align.bytes() as c_uint,
 736                 src,
 737                 src_align.bytes() as c_uint,
 738                 size,
 739                 is_volatile,
 740             );
 741         }
 742     }
 743
 744     fn memmove(
 745         &mut self,
 746         dst: &'ll Value,
 747         dst_align: Align,
 748         src: &'ll Value,
 749         src_align: Align,
 750         size: &'ll Value,
 751         flags: MemFlags,
 752     ) {
 753         if flags.contains(MemFlags::NONTEMPORAL) {
 754             // HACK(nox): This is inefficient but there is no nontemporal memmove.
 755             let val = self.load(src, src_align);
 756             let ptr = self.pointercast(dst, self.type_ptr_to(self.val_ty(val)));
 757             self.store_with_flags(val, ptr, dst_align, flags);
 758             return;
 759         }
 760         let size = self.intcast(size, self.type_isize(), false);
 761         let is_volatile = flags.contains(MemFlags::VOLATILE);
 762         let dst = self.pointercast(dst, self.type_i8p());
 763         let src = self.pointercast(src, self.type_i8p());
 764         unsafe {
 765             llvm::LLVMRustBuildMemMove(
 766                 self.llbuilder,
 767                 dst,
 768                 dst_align.bytes() as c_uint,
 769                 src,
 770                 src_align.bytes() as c_uint,
 771                 size,
 772                 is_volatile,
 773             );
 774         }
 775     }
 776
 777     fn memset(
 778         &mut self,
 779         ptr: &'ll Value,
 780         fill_byte: &'ll Value,
 781         size: &'ll Value,
 782         align: Align,
 783         flags: MemFlags,
 784     ) {
 785         let is_volatile = flags.contains(MemFlags::VOLATILE);
 786         let ptr = self.pointercast(ptr, self.type_i8p());
 787         unsafe {
 788             llvm::LLVMRustBuildMemSet(
 789                 self.llbuilder,
 790                 ptr,
 791                 align.bytes() as c_uint,
 792                 fill_byte,
 793                 size,
 794                 is_volatile,
 795             );
 796         }
 797     }
 798
 799     fn select(
 800         &mut self,
 801         cond: &'ll Value,
 802         then_val: &'ll Value,
 803         else_val: &'ll Value,
 804     ) -> &'ll Value {
 805         unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
 806     }
 807
 808     #[allow(dead_code)]
 809     fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
 810         unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
 811     }
 812
 813     fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
 814         unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
 815     }
 816
 817     fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
 818         unsafe {
 819             let elt_ty = self.cx.val_ty(elt);
 820             let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
 821             let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
 822             let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
 823             self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
 824         }
 825     }
 826
 827     fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
 828         assert_eq!(idx as c_uint as u64, idx);
 829         unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
 830     }
 831
 832     fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
 833         assert_eq!(idx as c_uint as u64, idx);
 834         unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
 835     }
 836
 837     fn landing_pad(
 838         &mut self,
 839         ty: &'ll Type,
 840         pers_fn: &'ll Value,
 841         num_clauses: usize,
 842     ) -> &'ll Value {
 843         unsafe {
 844             llvm::LLVMBuildLandingPad(self.llbuilder, ty, pers_fn, num_clauses as c_uint, UNNAMED)
 845         }
 846     }
 847
 848     fn set_cleanup(&mut self, landing_pad: &'ll Value) {
 849         unsafe {
 850             llvm::LLVMSetCleanup(landing_pad, llvm::True);
 851         }
 852     }
 853
 854     fn resume(&mut self, exn: &'ll Value) -> &'ll Value {
 855         unsafe { llvm::LLVMBuildResume(self.llbuilder, exn) }
 856     }
 857
 858     fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
 859         let name = const_cstr!("cleanuppad");
 860         let ret = unsafe {
 861             llvm::LLVMRustBuildCleanupPad(
 862                 self.llbuilder,
 863                 parent,
 864                 args.len() as c_uint,
 865                 args.as_ptr(),
 866                 name.as_ptr(),
 867             )
 868         };
 869         Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
 870     }
 871
 872     fn cleanup_ret(
 873         &mut self,
 874         funclet: &Funclet<'ll>,
 875         unwind: Option<&'ll BasicBlock>,
 876     ) -> &'ll Value {
 877         let ret =
 878             unsafe { llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind) };
 879         ret.expect("LLVM does not have support for cleanupret")
 880     }
 881
 882     fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
 883         let name = const_cstr!("catchpad");
 884         let ret = unsafe {
 885             llvm::LLVMRustBuildCatchPad(
 886                 self.llbuilder,
 887                 parent,
 888                 args.len() as c_uint,
 889                 args.as_ptr(),
 890                 name.as_ptr(),
 891             )
 892         };
 893         Funclet::new(ret.expect("LLVM does not have support for catchpad"))
 894     }
 895
 896     fn catch_switch(
 897         &mut self,
 898         parent: Option<&'ll Value>,
 899         unwind: Option<&'ll BasicBlock>,
 900         num_handlers: usize,
 901     ) -> &'ll Value {
 902         let name = const_cstr!("catchswitch");
 903         let ret = unsafe {
 904             llvm::LLVMRustBuildCatchSwitch(
 905                 self.llbuilder,
 906                 parent,
 907                 unwind,
 908                 num_handlers as c_uint,
 909                 name.as_ptr(),
 910             )
 911         };
 912         ret.expect("LLVM does not have support for catchswitch")
 913     }
 914
 915     fn add_handler(&mut self, catch_switch: &'ll Value, handler: &'ll BasicBlock) {
 916         unsafe {
 917             llvm::LLVMRustAddHandler(catch_switch, handler);
 918         }
 919     }
 920
 921     fn set_personality_fn(&mut self, personality: &'ll Value) {
 922         unsafe {
 923             llvm::LLVMSetPersonalityFn(self.llfn(), personality);
 924         }
 925     }
 926
 927     // Atomic Operations
 928     fn atomic_cmpxchg(
 929         &mut self,
 930         dst: &'ll Value,
 931         cmp: &'ll Value,
 932         src: &'ll Value,
 933         order: rustc_codegen_ssa::common::AtomicOrdering,
 934         failure_order: rustc_codegen_ssa::common::AtomicOrdering,
 935         weak: bool,
 936     ) -> &'ll Value {
 937         let weak = if weak { llvm::True } else { llvm::False };
 938         unsafe {
 939             llvm::LLVMRustBuildAtomicCmpXchg(
 940                 self.llbuilder,
 941                 dst,
 942                 cmp,
 943                 src,
 944                 AtomicOrdering::from_generic(order),
 945                 AtomicOrdering::from_generic(failure_order),
 946                 weak,
 947             )
 948         }
 949     }
 950     fn atomic_rmw(
 951         &mut self,
 952         op: rustc_codegen_ssa::common::AtomicRmwBinOp,
 953         dst: &'ll Value,
 954         src: &'ll Value,
 955         order: rustc_codegen_ssa::common::AtomicOrdering,
 956     ) -> &'ll Value {
 957         unsafe {
 958             llvm::LLVMBuildAtomicRMW(
 959                 self.llbuilder,
 960                 AtomicRmwBinOp::from_generic(op),
 961                 dst,
 962                 src,
 963                 AtomicOrdering::from_generic(order),
 964                 False,
 965             )
 966         }
 967     }
 968
 969     fn atomic_fence(
 970         &mut self,
 971         order: rustc_codegen_ssa::common::AtomicOrdering,
 972         scope: rustc_codegen_ssa::common::SynchronizationScope,
 973     ) {
 974         unsafe {
 975             llvm::LLVMRustBuildAtomicFence(
 976                 self.llbuilder,
 977                 AtomicOrdering::from_generic(order),
 978                 SynchronizationScope::from_generic(scope),
 979             );
 980         }
 981     }
 982
 983     fn set_invariant_load(&mut self, load: &'ll Value) {
 984         unsafe {
 985             llvm::LLVMSetMetadata(
 986                 load,
 987                 llvm::MD_invariant_load as c_uint,
 988                 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
 989             );
 990         }
 991     }
 992
 993     fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
 994         self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
 995     }
 996
 997     fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
 998         self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
 999     }
1000
1001     fn call(
1002         &mut self,
1003         llfn: &'ll Value,
1004         args: &[&'ll Value],
1005         funclet: Option<&Funclet<'ll>>,
1006     ) -> &'ll Value {
1007         debug!("call {:?} with args ({:?})", llfn, args);
1008
1009         let args = self.check_call("call", llfn, args);
1010         let bundle = funclet.map(|funclet| funclet.bundle());
1011         let bundle = bundle.as_ref().map(|b| &*b.raw);
1012
1013         unsafe {
1014             llvm::LLVMRustBuildCall(
1015                 self.llbuilder,
1016                 llfn,
1017                 args.as_ptr() as *const &llvm::Value,
1018                 args.len() as c_uint,
1019                 bundle,
1020             )
1021         }
1022     }
1023
1024     fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1025         unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
1026     }
1027
1028     fn cx(&self) -> &CodegenCx<'ll, 'tcx> {
1029         self.cx
1030     }
1031
1032     unsafe fn delete_basic_block(&mut self, bb: &'ll BasicBlock) {
1033         llvm::LLVMDeleteBasicBlock(bb);
1034     }
1035
1036     fn do_not_inline(&mut self, llret: &'ll Value) {
1037         llvm::Attribute::NoInline.apply_callsite(llvm::AttributePlace::Function, llret);
1038     }
1039 }
1040
1041 impl StaticBuilderMethods for Builder<'a, 'll, 'tcx> {
1042     fn get_static(&mut self, def_id: DefId) -> &'ll Value {
1043         // Forward to the `get_static` method of `CodegenCx`
1044         self.cx().get_static(def_id)
1045     }
1046 }
1047
1048 impl Builder<'a, 'll, 'tcx> {
1049     pub fn llfn(&self) -> &'ll Value {
1050         unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
1051     }
1052
1053     fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
1054         unsafe {
1055             llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
1056         }
1057     }
1058
1059     pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1060         unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
1061     }
1062
1063     pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1064         unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
1065     }
1066
1067     pub fn insert_element(
1068         &mut self,
1069         vec: &'ll Value,
1070         elt: &'ll Value,
1071         idx: &'ll Value,
1072     ) -> &'ll Value {
1073         unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
1074     }
1075
1076     pub fn shuffle_vector(
1077         &mut self,
1078         v1: &'ll Value,
1079         v2: &'ll Value,
1080         mask: &'ll Value,
1081     ) -> &'ll Value {
1082         unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
1083     }
1084
1085     pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1086         unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
1087     }
1088     pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1089         unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
1090     }
1091     pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1092         unsafe {
1093             let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
1094             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
1095             instr
1096         }
1097     }
1098     pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1099         unsafe {
1100             let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
1101             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
1102             instr
1103         }
1104     }
1105     pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
1106         unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
1107     }
1108     pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
1109         unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
1110     }
1111     pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
1112         unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
1113     }
1114     pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
1115         unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
1116     }
1117     pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
1118         unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
1119     }
1120     pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
1121         unsafe {
1122             llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
1123         }
1124     }
1125     pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
1126         unsafe {
1127             llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
1128         }
1129     }
1130     pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
1131         unsafe {
1132             let instr =
1133                 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
1134             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
1135             instr
1136         }
1137     }
1138     pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
1139         unsafe {
1140             let instr =
1141                 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
1142             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
1143             instr
1144         }
1145     }
1146     pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1147         unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
1148     }
1149     pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1150         unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
1151     }
1152
1153     pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
1154         unsafe {
1155             llvm::LLVMAddClause(landing_pad, clause);
1156         }
1157     }
1158
1159     pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
1160         let ret =
1161             unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
1162         ret.expect("LLVM does not have support for catchret")
1163     }
1164
1165     fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
1166         let dest_ptr_ty = self.cx.val_ty(ptr);
1167         let stored_ty = self.cx.val_ty(val);
1168         let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
1169
1170         assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
1171
1172         if dest_ptr_ty == stored_ptr_ty {
1173             ptr
1174         } else {
1175             debug!(
1176                 "type mismatch in store. \
1177                     Expected {:?}, got {:?}; inserting bitcast",
1178                 dest_ptr_ty, stored_ptr_ty
1179             );
1180             self.bitcast(ptr, stored_ptr_ty)
1181         }
1182     }
1183
1184     fn check_call<'b>(
1185         &mut self,
1186         typ: &str,
1187         llfn: &'ll Value,
1188         args: &'b [&'ll Value],
1189     ) -> Cow<'b, [&'ll Value]> {
1190         let mut fn_ty = self.cx.val_ty(llfn);
1191         // Strip off pointers
1192         while self.cx.type_kind(fn_ty) == TypeKind::Pointer {
1193             fn_ty = self.cx.element_type(fn_ty);
1194         }
1195
1196         assert!(
1197             self.cx.type_kind(fn_ty) == TypeKind::Function,
1198             "builder::{} not passed a function, but {:?}",
1199             typ,
1200             fn_ty
1201         );
1202
1203         let param_tys = self.cx.func_params_types(fn_ty);
1204
1205         let all_args_match = param_tys
1206             .iter()
1207             .zip(args.iter().map(|&v| self.val_ty(v)))
1208             .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
1209
1210         if all_args_match {
1211             return Cow::Borrowed(args);
1212         }
1213
1214         let casted_args: Vec<_> = param_tys
1215             .into_iter()
1216             .zip(args.iter())
1217             .enumerate()
1218             .map(|(i, (expected_ty, &actual_val))| {
1219                 let actual_ty = self.val_ty(actual_val);
1220                 if expected_ty != actual_ty {
1221                     debug!(
1222                         "type mismatch in function call of {:?}. \
1223                             Expected {:?} for param {}, got {:?}; injecting bitcast",
1224                         llfn, expected_ty, i, actual_ty
1225                     );
1226                     self.bitcast(actual_val, expected_ty)
1227                 } else {
1228                     actual_val
1229                 }
1230             })
1231             .collect();
1232
1233         Cow::Owned(casted_args)
1234     }
1235
1236     pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
1237         unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
1238     }
1239
1240     fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
1241         let size = size.bytes();
1242         if size == 0 {
1243             return;
1244         }
1245
1246         let opts = &self.cx.sess().opts;
1247         let emit = match opts.debugging_opts.sanitizer {
1248             // Some sanitizer use lifetime intrinsics. When they are in use,
1249             // emit lifetime intrinsics regardless of optimization level.
1250             Some(Sanitizer::Address | Sanitizer::Memory) => true,
1251             _ => opts.optimize != config::OptLevel::No,
1252         };
1253         if !emit {
1254             return;
1255         }
1256
1257         let lifetime_intrinsic = self.cx.get_intrinsic(intrinsic);
1258
1259         let ptr = self.pointercast(ptr, self.cx.type_i8p());
1260         self.call(lifetime_intrinsic, &[self.cx.const_u64(size), ptr], None);
1261     }
1262
1263     fn phi(&mut self, ty: &'ll Type, vals: &[&'ll Value], bbs: &[&'ll BasicBlock]) -> &'ll Value {
1264         assert_eq!(vals.len(), bbs.len());
1265         let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
1266         unsafe {
1267             llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
1268             phi
1269         }
1270     }
1271
1272     fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
1273         unsafe {
1274             llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
1275         }
1276     }
1277 }