2 use crate::common::Funclet;
3 use crate::context::CodegenCx;
4 use crate::llvm::{self, BasicBlock, False};
5 use crate::llvm::{AtomicOrdering, AtomicRmwBinOp, SynchronizationScope};
6 use crate::type_::Type;
7 use crate::type_of::LayoutLlvmExt;
8 use crate::value::Value;
10 use libc::{c_char, c_uint};
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::small_c_str::SmallCStr;
17 use rustc_hir::def_id::DefId;
18 use rustc_middle::ty::layout::{
19 FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, TyAndLayout,
21 use rustc_middle::ty::{self, Ty, TyCtxt};
23 use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
24 use rustc_target::spec::{HasTargetSpec, Target};
31 // All Builders must have an llfn associated with them
33 pub struct Builder<'a, 'll, 'tcx> {
34 pub llbuilder: &'ll mut llvm::Builder<'ll>,
35 pub cx: &'a CodegenCx<'ll, 'tcx>,
38 impl Drop for Builder<'_, '_, '_> {
41 llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
46 // FIXME(eddyb) use a checked constructor when they become `const fn`.
47 const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
49 /// Empty string, to be used where LLVM expects an instruction name, indicating
50 /// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
51 // FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
52 const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
54 impl<'ll, 'tcx> BackendTypes for Builder<'_, 'll, 'tcx> {
55 type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
56 type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
57 type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
58 type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
59 type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;
61 type DIScope = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIScope;
62 type DILocation = <CodegenCx<'ll, 'tcx> as BackendTypes>::DILocation;
63 type DIVariable = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIVariable;
66 impl abi::HasDataLayout for Builder<'_, '_, '_> {
67 fn data_layout(&self) -> &abi::TargetDataLayout {
72 impl<'tcx> ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
74 fn tcx(&self) -> TyCtxt<'tcx> {
79 impl<'tcx> ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
80 fn param_env(&self) -> ty::ParamEnv<'tcx> {
85 impl HasTargetSpec for Builder<'_, '_, '_> {
87 fn target_spec(&self) -> &Target {
92 impl<'tcx> LayoutOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
93 type LayoutOfResult = TyAndLayout<'tcx>;
96 fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
97 self.cx.handle_layout_err(err, span, ty)
101 impl<'tcx> FnAbiOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
102 type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
105 fn handle_fn_abi_err(
107 err: FnAbiError<'tcx>,
109 fn_abi_request: FnAbiRequest<'tcx>,
111 self.cx.handle_fn_abi_err(err, span, fn_abi_request)
115 impl<'ll, 'tcx> Deref for Builder<'_, 'll, 'tcx> {
116 type Target = CodegenCx<'ll, 'tcx>;
119 fn deref(&self) -> &Self::Target {
124 impl<'ll, 'tcx> HasCodegen<'tcx> for Builder<'_, 'll, 'tcx> {
125 type CodegenCx = CodegenCx<'ll, 'tcx>;
128 macro_rules! builder_methods_for_value_instructions {
129 ($($name:ident($($arg:ident),*) => $llvm_capi:ident),+ $(,)?) => {
130 $(fn $name(&mut self, $($arg: &'ll Value),*) -> &'ll Value {
132 llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
138 impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
139 fn build(cx: &'a CodegenCx<'ll, 'tcx>, llbb: &'ll BasicBlock) -> Self {
140 let bx = Builder::with_cx(cx);
142 llvm::LLVMPositionBuilderAtEnd(bx.llbuilder, llbb);
147 fn cx(&self) -> &CodegenCx<'ll, 'tcx> {
151 fn llbb(&self) -> &'ll BasicBlock {
152 unsafe { llvm::LLVMGetInsertBlock(self.llbuilder) }
155 fn set_span(&mut self, _span: Span) {}
157 fn append_block(cx: &'a CodegenCx<'ll, 'tcx>, llfn: &'ll Value, name: &str) -> &'ll BasicBlock {
159 let name = SmallCStr::new(name);
160 llvm::LLVMAppendBasicBlockInContext(cx.llcx, llfn, name.as_ptr())
164 fn append_sibling_block(&mut self, name: &str) -> &'ll BasicBlock {
165 Self::append_block(self.cx, self.llfn(), name)
168 fn switch_to_block(&mut self, llbb: Self::BasicBlock) {
169 *self = Self::build(self.cx, llbb)
172 fn ret_void(&mut self) {
174 llvm::LLVMBuildRetVoid(self.llbuilder);
178 fn ret(&mut self, v: &'ll Value) {
180 llvm::LLVMBuildRet(self.llbuilder, v);
184 fn br(&mut self, dest: &'ll BasicBlock) {
186 llvm::LLVMBuildBr(self.llbuilder, dest);
193 then_llbb: &'ll BasicBlock,
194 else_llbb: &'ll BasicBlock,
197 llvm::LLVMBuildCondBr(self.llbuilder, cond, then_llbb, else_llbb);
204 else_llbb: &'ll BasicBlock,
205 cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)>,
208 unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };
209 for (on_val, dest) in cases {
210 let on_val = self.const_uint_big(self.val_ty(v), on_val);
211 unsafe { llvm::LLVMAddCase(switch, on_val, dest) }
220 then: &'ll BasicBlock,
221 catch: &'ll BasicBlock,
222 funclet: Option<&Funclet<'ll>>,
224 debug!("invoke {:?} with args ({:?})", llfn, args);
226 let args = self.check_call("invoke", llty, llfn, args);
227 let bundle = funclet.map(|funclet| funclet.bundle());
228 let bundle = bundle.as_ref().map(|b| &*b.raw);
231 llvm::LLVMRustBuildInvoke(
236 args.len() as c_uint,
245 fn unreachable(&mut self) {
247 llvm::LLVMBuildUnreachable(self.llbuilder);
251 builder_methods_for_value_instructions! {
252 add(a, b) => LLVMBuildAdd,
253 fadd(a, b) => LLVMBuildFAdd,
254 sub(a, b) => LLVMBuildSub,
255 fsub(a, b) => LLVMBuildFSub,
256 mul(a, b) => LLVMBuildMul,
257 fmul(a, b) => LLVMBuildFMul,
258 udiv(a, b) => LLVMBuildUDiv,
259 exactudiv(a, b) => LLVMBuildExactUDiv,
260 sdiv(a, b) => LLVMBuildSDiv,
261 exactsdiv(a, b) => LLVMBuildExactSDiv,
262 fdiv(a, b) => LLVMBuildFDiv,
263 urem(a, b) => LLVMBuildURem,
264 srem(a, b) => LLVMBuildSRem,
265 frem(a, b) => LLVMBuildFRem,
266 shl(a, b) => LLVMBuildShl,
267 lshr(a, b) => LLVMBuildLShr,
268 ashr(a, b) => LLVMBuildAShr,
269 and(a, b) => LLVMBuildAnd,
270 or(a, b) => LLVMBuildOr,
271 xor(a, b) => LLVMBuildXor,
272 neg(x) => LLVMBuildNeg,
273 fneg(x) => LLVMBuildFNeg,
274 not(x) => LLVMBuildNot,
275 unchecked_sadd(x, y) => LLVMBuildNSWAdd,
276 unchecked_uadd(x, y) => LLVMBuildNUWAdd,
277 unchecked_ssub(x, y) => LLVMBuildNSWSub,
278 unchecked_usub(x, y) => LLVMBuildNUWSub,
279 unchecked_smul(x, y) => LLVMBuildNSWMul,
280 unchecked_umul(x, y) => LLVMBuildNUWMul,
283 fn fadd_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
285 let instr = llvm::LLVMBuildFAdd(self.llbuilder, lhs, rhs, UNNAMED);
286 llvm::LLVMRustSetFastMath(instr);
291 fn fsub_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
293 let instr = llvm::LLVMBuildFSub(self.llbuilder, lhs, rhs, UNNAMED);
294 llvm::LLVMRustSetFastMath(instr);
299 fn fmul_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
301 let instr = llvm::LLVMBuildFMul(self.llbuilder, lhs, rhs, UNNAMED);
302 llvm::LLVMRustSetFastMath(instr);
307 fn fdiv_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
309 let instr = llvm::LLVMBuildFDiv(self.llbuilder, lhs, rhs, UNNAMED);
310 llvm::LLVMRustSetFastMath(instr);
315 fn frem_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
317 let instr = llvm::LLVMBuildFRem(self.llbuilder, lhs, rhs, UNNAMED);
318 llvm::LLVMRustSetFastMath(instr);
329 ) -> (Self::Value, Self::Value) {
330 use rustc_middle::ty::{Int, Uint};
331 use rustc_middle::ty::{IntTy::*, UintTy::*};
333 let new_kind = match ty.kind() {
334 Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
335 Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
336 t @ (Uint(_) | Int(_)) => t.clone(),
337 _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
340 let name = match oop {
341 OverflowOp::Add => match new_kind {
342 Int(I8) => "llvm.sadd.with.overflow.i8",
343 Int(I16) => "llvm.sadd.with.overflow.i16",
344 Int(I32) => "llvm.sadd.with.overflow.i32",
345 Int(I64) => "llvm.sadd.with.overflow.i64",
346 Int(I128) => "llvm.sadd.with.overflow.i128",
348 Uint(U8) => "llvm.uadd.with.overflow.i8",
349 Uint(U16) => "llvm.uadd.with.overflow.i16",
350 Uint(U32) => "llvm.uadd.with.overflow.i32",
351 Uint(U64) => "llvm.uadd.with.overflow.i64",
352 Uint(U128) => "llvm.uadd.with.overflow.i128",
356 OverflowOp::Sub => match new_kind {
357 Int(I8) => "llvm.ssub.with.overflow.i8",
358 Int(I16) => "llvm.ssub.with.overflow.i16",
359 Int(I32) => "llvm.ssub.with.overflow.i32",
360 Int(I64) => "llvm.ssub.with.overflow.i64",
361 Int(I128) => "llvm.ssub.with.overflow.i128",
363 Uint(U8) => "llvm.usub.with.overflow.i8",
364 Uint(U16) => "llvm.usub.with.overflow.i16",
365 Uint(U32) => "llvm.usub.with.overflow.i32",
366 Uint(U64) => "llvm.usub.with.overflow.i64",
367 Uint(U128) => "llvm.usub.with.overflow.i128",
371 OverflowOp::Mul => match new_kind {
372 Int(I8) => "llvm.smul.with.overflow.i8",
373 Int(I16) => "llvm.smul.with.overflow.i16",
374 Int(I32) => "llvm.smul.with.overflow.i32",
375 Int(I64) => "llvm.smul.with.overflow.i64",
376 Int(I128) => "llvm.smul.with.overflow.i128",
378 Uint(U8) => "llvm.umul.with.overflow.i8",
379 Uint(U16) => "llvm.umul.with.overflow.i16",
380 Uint(U32) => "llvm.umul.with.overflow.i32",
381 Uint(U64) => "llvm.umul.with.overflow.i64",
382 Uint(U128) => "llvm.umul.with.overflow.i128",
388 let res = self.call_intrinsic(name, &[lhs, rhs]);
389 (self.extract_value(res, 0), self.extract_value(res, 1))
392 fn from_immediate(&mut self, val: Self::Value) -> Self::Value {
393 if self.cx().val_ty(val) == self.cx().type_i1() {
394 self.zext(val, self.cx().type_i8())
399 fn to_immediate_scalar(&mut self, val: Self::Value, scalar: abi::Scalar) -> Self::Value {
400 if scalar.is_bool() {
401 return self.trunc(val, self.cx().type_i1());
406 fn alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
407 let mut bx = Builder::with_cx(self.cx);
408 bx.position_at_start(unsafe { llvm::LLVMGetFirstBasicBlock(self.llfn()) });
409 bx.dynamic_alloca(ty, align)
412 fn dynamic_alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
414 let alloca = llvm::LLVMBuildAlloca(self.llbuilder, ty, UNNAMED);
415 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
420 fn array_alloca(&mut self, ty: &'ll Type, len: &'ll Value, align: Align) -> &'ll Value {
422 let alloca = llvm::LLVMBuildArrayAlloca(self.llbuilder, ty, len, UNNAMED);
423 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
428 fn load(&mut self, ty: &'ll Type, ptr: &'ll Value, align: Align) -> &'ll Value {
430 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
431 llvm::LLVMSetAlignment(load, align.bytes() as c_uint);
436 fn volatile_load(&mut self, ty: &'ll Type, ptr: &'ll Value) -> &'ll Value {
438 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
439 llvm::LLVMSetVolatile(load, llvm::True);
448 order: rustc_codegen_ssa::common::AtomicOrdering,
452 let load = llvm::LLVMRustBuildAtomicLoad(
457 AtomicOrdering::from_generic(order),
459 // LLVM requires the alignment of atomic loads to be at least the size of the type.
460 llvm::LLVMSetAlignment(load, size.bytes() as c_uint);
465 #[instrument(level = "trace", skip(self))]
466 fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
467 assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
469 if place.layout.is_zst() {
470 return OperandRef::new_zst(self, place.layout);
473 #[instrument(level = "trace", skip(bx))]
474 fn scalar_load_metadata<'a, 'll, 'tcx>(
475 bx: &mut Builder<'a, 'll, 'tcx>,
478 layout: TyAndLayout<'tcx>,
481 if !scalar.is_always_valid(bx) {
482 bx.noundef_metadata(load);
485 match scalar.primitive() {
487 if !scalar.is_always_valid(bx) {
488 bx.range_metadata(load, scalar.valid_range(bx));
492 if !scalar.valid_range(bx).contains(0) {
493 bx.nonnull_metadata(load);
496 if let Some(pointee) = layout.pointee_info_at(bx, offset) {
497 if let Some(_) = pointee.safe {
498 bx.align_metadata(load, pointee.align);
502 abi::F32 | abi::F64 => {}
506 let val = if let Some(llextra) = place.llextra {
507 OperandValue::Ref(place.llval, Some(llextra), place.align)
508 } else if place.layout.is_llvm_immediate() {
509 let mut const_llval = None;
510 let llty = place.layout.llvm_type(self);
512 if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
513 if llvm::LLVMIsGlobalConstant(global) == llvm::True {
514 if let Some(init) = llvm::LLVMGetInitializer(global) {
515 if self.val_ty(init) == llty {
516 const_llval = Some(init);
522 let llval = const_llval.unwrap_or_else(|| {
523 let load = self.load(llty, place.llval, place.align);
524 if let abi::Abi::Scalar(scalar) = place.layout.abi {
525 scalar_load_metadata(self, load, scalar, place.layout, Size::ZERO);
529 OperandValue::Immediate(self.to_immediate(llval, place.layout))
530 } else if let abi::Abi::ScalarPair(a, b) = place.layout.abi {
531 let b_offset = a.size(self).align_to(b.align(self).abi);
532 let pair_ty = place.layout.llvm_type(self);
534 let mut load = |i, scalar: abi::Scalar, layout, align, offset| {
535 let llptr = self.struct_gep(pair_ty, place.llval, i as u64);
536 let llty = place.layout.scalar_pair_element_llvm_type(self, i, false);
537 let load = self.load(llty, llptr, align);
538 scalar_load_metadata(self, load, scalar, layout, offset);
539 self.to_immediate_scalar(load, scalar)
543 load(0, a, place.layout, place.align, Size::ZERO),
544 load(1, b, place.layout, place.align.restrict_for_offset(b_offset), b_offset),
547 OperandValue::Ref(place.llval, None, place.align)
550 OperandRef { val, layout: place.layout }
553 fn write_operand_repeatedly(
555 cg_elem: OperandRef<'tcx, &'ll Value>,
557 dest: PlaceRef<'tcx, &'ll Value>,
559 let zero = self.const_usize(0);
560 let count = self.const_usize(count);
561 let start = dest.project_index(&mut self, zero).llval;
562 let end = dest.project_index(&mut self, count).llval;
564 let header_bb = self.append_sibling_block("repeat_loop_header");
565 let body_bb = self.append_sibling_block("repeat_loop_body");
566 let next_bb = self.append_sibling_block("repeat_loop_next");
570 let mut header_bx = Self::build(self.cx, header_bb);
571 let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
573 let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
574 header_bx.cond_br(keep_going, body_bb, next_bb);
576 let mut body_bx = Self::build(self.cx, body_bb);
577 let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
580 .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
582 let next = body_bx.inbounds_gep(
583 self.backend_type(cg_elem.layout),
585 &[self.const_usize(1)],
587 body_bx.br(header_bb);
588 header_bx.add_incoming_to_phi(current, next, body_bb);
590 Self::build(self.cx, next_bb)
593 fn range_metadata(&mut self, load: &'ll Value, range: WrappingRange) {
594 if self.sess().target.arch == "amdgpu" {
595 // amdgpu/LLVM does something weird and thinks an i64 value is
596 // split into a v2i32, halving the bitwidth LLVM expects,
597 // tripping an assertion. So, for now, just disable this
603 let llty = self.cx.val_ty(load);
605 self.cx.const_uint_big(llty, range.start),
606 self.cx.const_uint_big(llty, range.end.wrapping_add(1)),
609 llvm::LLVMSetMetadata(
611 llvm::MD_range as c_uint,
612 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
617 fn nonnull_metadata(&mut self, load: &'ll Value) {
619 llvm::LLVMSetMetadata(
621 llvm::MD_nonnull as c_uint,
622 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
627 fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
628 self.store_with_flags(val, ptr, align, MemFlags::empty())
638 debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
639 let ptr = self.check_store(val, ptr);
641 let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
643 if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
644 llvm::LLVMSetAlignment(store, align);
645 if flags.contains(MemFlags::VOLATILE) {
646 llvm::LLVMSetVolatile(store, llvm::True);
648 if flags.contains(MemFlags::NONTEMPORAL) {
649 // According to LLVM [1] building a nontemporal store must
650 // *always* point to a metadata value of the integer 1.
652 // [1]: https://llvm.org/docs/LangRef.html#store-instruction
653 let one = self.cx.const_i32(1);
654 let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
655 llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
665 order: rustc_codegen_ssa::common::AtomicOrdering,
668 debug!("Store {:?} -> {:?}", val, ptr);
669 let ptr = self.check_store(val, ptr);
671 let store = llvm::LLVMRustBuildAtomicStore(
675 AtomicOrdering::from_generic(order),
677 // LLVM requires the alignment of atomic stores to be at least the size of the type.
678 llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
682 fn gep(&mut self, ty: &'ll Type, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
689 indices.len() as c_uint,
699 indices: &[&'ll Value],
702 llvm::LLVMBuildInBoundsGEP2(
707 indices.len() as c_uint,
713 fn struct_gep(&mut self, ty: &'ll Type, ptr: &'ll Value, idx: u64) -> &'ll Value {
714 assert_eq!(idx as c_uint as u64, idx);
715 unsafe { llvm::LLVMBuildStructGEP2(self.llbuilder, ty, ptr, idx as c_uint, UNNAMED) }
719 fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
720 unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
723 fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
724 unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
727 fn fptoui_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
728 self.fptoint_sat(false, val, dest_ty)
731 fn fptosi_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
732 self.fptoint_sat(true, val, dest_ty)
735 fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
736 // On WebAssembly the `fptoui` and `fptosi` instructions currently have
737 // poor codegen. The reason for this is that the corresponding wasm
738 // instructions, `i32.trunc_f32_s` for example, will trap when the float
739 // is out-of-bounds, infinity, or nan. This means that LLVM
740 // automatically inserts control flow around `fptoui` and `fptosi`
741 // because the LLVM instruction `fptoui` is defined as producing a
742 // poison value, not having UB on out-of-bounds values.
744 // This method, however, is only used with non-saturating casts that
745 // have UB on out-of-bounds values. This means that it's ok if we use
746 // the raw wasm instruction since out-of-bounds values can do whatever
747 // we like. To ensure that LLVM picks the right instruction we choose
748 // the raw wasm intrinsic functions which avoid LLVM inserting all the
749 // other control flow automatically.
750 if self.sess().target.is_like_wasm {
751 let src_ty = self.cx.val_ty(val);
752 if self.cx.type_kind(src_ty) != TypeKind::Vector {
753 let float_width = self.cx.float_width(src_ty);
754 let int_width = self.cx.int_width(dest_ty);
755 let name = match (int_width, float_width) {
756 (32, 32) => Some("llvm.wasm.trunc.unsigned.i32.f32"),
757 (32, 64) => Some("llvm.wasm.trunc.unsigned.i32.f64"),
758 (64, 32) => Some("llvm.wasm.trunc.unsigned.i64.f32"),
759 (64, 64) => Some("llvm.wasm.trunc.unsigned.i64.f64"),
762 if let Some(name) = name {
763 return self.call_intrinsic(name, &[val]);
767 unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
770 fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
771 // see `fptoui` above for why wasm is different here
772 if self.sess().target.is_like_wasm {
773 let src_ty = self.cx.val_ty(val);
774 if self.cx.type_kind(src_ty) != TypeKind::Vector {
775 let float_width = self.cx.float_width(src_ty);
776 let int_width = self.cx.int_width(dest_ty);
777 let name = match (int_width, float_width) {
778 (32, 32) => Some("llvm.wasm.trunc.signed.i32.f32"),
779 (32, 64) => Some("llvm.wasm.trunc.signed.i32.f64"),
780 (64, 32) => Some("llvm.wasm.trunc.signed.i64.f32"),
781 (64, 64) => Some("llvm.wasm.trunc.signed.i64.f64"),
784 if let Some(name) = name {
785 return self.call_intrinsic(name, &[val]);
789 unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
792 fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
793 unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
796 fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
797 unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
800 fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
801 unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
804 fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
805 unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
808 fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
809 unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
812 fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
813 unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
816 fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
817 unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
820 fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
821 unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
824 fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
825 unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
829 fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
830 let op = llvm::IntPredicate::from_generic(op);
831 unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
834 fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
835 let op = llvm::RealPredicate::from_generic(op);
836 unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
839 /* Miscellaneous instructions */
849 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
850 let size = self.intcast(size, self.type_isize(), false);
851 let is_volatile = flags.contains(MemFlags::VOLATILE);
852 let dst = self.pointercast(dst, self.type_i8p());
853 let src = self.pointercast(src, self.type_i8p());
855 llvm::LLVMRustBuildMemCpy(
858 dst_align.bytes() as c_uint,
860 src_align.bytes() as c_uint,
876 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memmove not supported");
877 let size = self.intcast(size, self.type_isize(), false);
878 let is_volatile = flags.contains(MemFlags::VOLATILE);
879 let dst = self.pointercast(dst, self.type_i8p());
880 let src = self.pointercast(src, self.type_i8p());
882 llvm::LLVMRustBuildMemMove(
885 dst_align.bytes() as c_uint,
887 src_align.bytes() as c_uint,
897 fill_byte: &'ll Value,
902 let is_volatile = flags.contains(MemFlags::VOLATILE);
903 let ptr = self.pointercast(ptr, self.type_i8p());
905 llvm::LLVMRustBuildMemSet(
908 align.bytes() as c_uint,
919 then_val: &'ll Value,
920 else_val: &'ll Value,
922 unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
925 fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
926 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
929 fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
930 unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
933 fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
935 let elt_ty = self.cx.val_ty(elt);
936 let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
937 let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
938 let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
939 self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
943 fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
944 assert_eq!(idx as c_uint as u64, idx);
945 unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
948 fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
949 assert_eq!(idx as c_uint as u64, idx);
950 unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
953 fn set_personality_fn(&mut self, personality: &'ll Value) {
955 llvm::LLVMSetPersonalityFn(self.llfn(), personality);
959 fn cleanup_landing_pad(&mut self, ty: &'ll Type, pers_fn: &'ll Value) -> &'ll Value {
960 let landing_pad = self.landing_pad(ty, pers_fn, 1 /* FIXME should this be 0? */);
962 llvm::LLVMSetCleanup(landing_pad, llvm::True);
967 fn resume(&mut self, exn: &'ll Value) {
969 llvm::LLVMBuildResume(self.llbuilder, exn);
973 fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
974 let name = cstr!("cleanuppad");
976 llvm::LLVMRustBuildCleanupPad(
979 args.len() as c_uint,
984 Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
987 fn cleanup_ret(&mut self, funclet: &Funclet<'ll>, unwind: Option<&'ll BasicBlock>) {
989 llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind)
990 .expect("LLVM does not have support for cleanupret");
994 fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
995 let name = cstr!("catchpad");
997 llvm::LLVMRustBuildCatchPad(
1000 args.len() as c_uint,
1005 Funclet::new(ret.expect("LLVM does not have support for catchpad"))
1010 parent: Option<&'ll Value>,
1011 unwind: Option<&'ll BasicBlock>,
1012 handlers: &[&'ll BasicBlock],
1014 let name = cstr!("catchswitch");
1016 llvm::LLVMRustBuildCatchSwitch(
1020 handlers.len() as c_uint,
1024 let ret = ret.expect("LLVM does not have support for catchswitch");
1025 for handler in handlers {
1027 llvm::LLVMRustAddHandler(ret, handler);
1033 // Atomic Operations
1039 order: rustc_codegen_ssa::common::AtomicOrdering,
1040 failure_order: rustc_codegen_ssa::common::AtomicOrdering,
1043 let weak = if weak { llvm::True } else { llvm::False };
1045 llvm::LLVMRustBuildAtomicCmpXchg(
1050 AtomicOrdering::from_generic(order),
1051 AtomicOrdering::from_generic(failure_order),
1058 op: rustc_codegen_ssa::common::AtomicRmwBinOp,
1061 order: rustc_codegen_ssa::common::AtomicOrdering,
1064 llvm::LLVMBuildAtomicRMW(
1066 AtomicRmwBinOp::from_generic(op),
1069 AtomicOrdering::from_generic(order),
1077 order: rustc_codegen_ssa::common::AtomicOrdering,
1078 scope: rustc_codegen_ssa::common::SynchronizationScope,
1081 llvm::LLVMRustBuildAtomicFence(
1083 AtomicOrdering::from_generic(order),
1084 SynchronizationScope::from_generic(scope),
1089 fn set_invariant_load(&mut self, load: &'ll Value) {
1091 llvm::LLVMSetMetadata(
1093 llvm::MD_invariant_load as c_uint,
1094 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1099 fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
1100 self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
1103 fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
1104 self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
1107 fn instrprof_increment(
1109 fn_name: &'ll Value,
1111 num_counters: &'ll Value,
1115 "instrprof_increment() with args ({:?}, {:?}, {:?}, {:?})",
1116 fn_name, hash, num_counters, index
1119 let llfn = unsafe { llvm::LLVMRustGetInstrProfIncrementIntrinsic(self.cx().llmod) };
1120 let llty = self.cx.type_func(
1121 &[self.cx.type_i8p(), self.cx.type_i64(), self.cx.type_i32(), self.cx.type_i32()],
1122 self.cx.type_void(),
1124 let args = &[fn_name, hash, num_counters, index];
1125 let args = self.check_call("call", llty, llfn, args);
1128 let _ = llvm::LLVMRustBuildCall(
1132 args.as_ptr() as *const &llvm::Value,
1133 args.len() as c_uint,
1143 args: &[&'ll Value],
1144 funclet: Option<&Funclet<'ll>>,
1146 debug!("call {:?} with args ({:?})", llfn, args);
1148 let args = self.check_call("call", llty, llfn, args);
1149 let bundle = funclet.map(|funclet| funclet.bundle());
1150 let bundle = bundle.as_ref().map(|b| &*b.raw);
1153 llvm::LLVMRustBuildCall(
1157 args.as_ptr() as *const &llvm::Value,
1158 args.len() as c_uint,
1164 fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1165 unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
1168 fn do_not_inline(&mut self, llret: &'ll Value) {
1169 let noinline = llvm::AttributeKind::NoInline.create_attr(self.llcx);
1170 attributes::apply_to_callsite(llret, llvm::AttributePlace::Function, &[noinline]);
1174 impl<'ll> StaticBuilderMethods for Builder<'_, 'll, '_> {
1175 fn get_static(&mut self, def_id: DefId) -> &'ll Value {
1176 // Forward to the `get_static` method of `CodegenCx`
1177 self.cx().get_static(def_id)
1181 impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
1182 fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
1183 // Create a fresh builder from the crate context.
1184 let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
1185 Builder { llbuilder, cx }
1188 pub fn llfn(&self) -> &'ll Value {
1189 unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
1192 fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
1194 llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
1198 fn align_metadata(&mut self, load: &'ll Value, align: Align) {
1200 let v = [self.cx.const_u64(align.bytes())];
1202 llvm::LLVMSetMetadata(
1204 llvm::MD_align as c_uint,
1205 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
1210 fn noundef_metadata(&mut self, load: &'ll Value) {
1212 llvm::LLVMSetMetadata(
1214 llvm::MD_noundef as c_uint,
1215 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1220 pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1221 unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
1224 pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1225 unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
1228 pub fn insert_element(
1234 unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
1237 pub fn shuffle_vector(
1243 unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
1246 pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1247 unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
1249 pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1250 unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
1252 pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1254 let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
1255 llvm::LLVMRustSetFastMath(instr);
1259 pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1261 let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
1262 llvm::LLVMRustSetFastMath(instr);
1266 pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
1267 unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
1269 pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
1270 unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
1272 pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
1273 unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
1275 pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
1276 unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
1278 pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
1279 unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
1281 pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
1283 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
1286 pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
1288 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
1291 pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
1294 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
1295 llvm::LLVMRustSetFastMath(instr);
1299 pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
1302 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
1303 llvm::LLVMRustSetFastMath(instr);
1307 pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1308 unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
1310 pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1311 unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
1314 pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
1316 llvm::LLVMAddClause(landing_pad, clause);
1320 pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
1322 unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
1323 ret.expect("LLVM does not have support for catchret")
1326 fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
1327 let dest_ptr_ty = self.cx.val_ty(ptr);
1328 let stored_ty = self.cx.val_ty(val);
1329 let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
1331 assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
1333 if dest_ptr_ty == stored_ptr_ty {
1337 "type mismatch in store. \
1338 Expected {:?}, got {:?}; inserting bitcast",
1339 dest_ptr_ty, stored_ptr_ty
1341 self.bitcast(ptr, stored_ptr_ty)
1350 args: &'b [&'ll Value],
1351 ) -> Cow<'b, [&'ll Value]> {
1353 self.cx.type_kind(fn_ty) == TypeKind::Function,
1354 "builder::{} not passed a function, but {:?}",
1359 let param_tys = self.cx.func_params_types(fn_ty);
1361 let all_args_match = iter::zip(¶m_tys, args.iter().map(|&v| self.val_ty(v)))
1362 .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
1365 return Cow::Borrowed(args);
1368 let casted_args: Vec<_> = iter::zip(param_tys, args)
1370 .map(|(i, (expected_ty, &actual_val))| {
1371 let actual_ty = self.val_ty(actual_val);
1372 if expected_ty != actual_ty {
1374 "type mismatch in function call of {:?}. \
1375 Expected {:?} for param {}, got {:?}; injecting bitcast",
1376 llfn, expected_ty, i, actual_ty
1378 self.bitcast(actual_val, expected_ty)
1385 Cow::Owned(casted_args)
1388 pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
1389 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
1392 pub(crate) fn call_intrinsic(&mut self, intrinsic: &str, args: &[&'ll Value]) -> &'ll Value {
1393 let (ty, f) = self.cx.get_intrinsic(intrinsic);
1394 self.call(ty, f, args, None)
1397 fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
1398 let size = size.bytes();
1403 if !self.cx().sess().emit_lifetime_markers() {
1407 let ptr = self.pointercast(ptr, self.cx.type_i8p());
1408 self.call_intrinsic(intrinsic, &[self.cx.const_u64(size), ptr]);
1414 vals: &[&'ll Value],
1415 bbs: &[&'ll BasicBlock],
1417 assert_eq!(vals.len(), bbs.len());
1418 let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
1420 llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
1425 fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
1427 llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
1431 fn fptoint_sat(&mut self, signed: bool, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1432 let src_ty = self.cx.val_ty(val);
1433 let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector {
1434 assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
1436 self.cx.element_type(src_ty),
1437 self.cx.element_type(dest_ty),
1438 Some(self.cx.vector_length(src_ty)),
1441 (src_ty, dest_ty, None)
1443 let float_width = self.cx.float_width(float_ty);
1444 let int_width = self.cx.int_width(int_ty);
1446 let instr = if signed { "fptosi" } else { "fptoui" };
1447 let name = if let Some(vector_length) = vector_length {
1449 "llvm.{}.sat.v{}i{}.v{}f{}",
1450 instr, vector_length, int_width, vector_length, float_width
1453 format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
1455 let f = self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
1456 self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None)
1459 pub(crate) fn landing_pad(
1462 pers_fn: &'ll Value,
1465 // Use LLVMSetPersonalityFn to set the personality. It supports arbitrary Consts while,
1466 // LLVMBuildLandingPad requires the argument to be a Function (as of LLVM 12). The
1467 // personality lives on the parent function anyway.
1468 self.set_personality_fn(pers_fn);
1470 llvm::LLVMBuildLandingPad(self.llbuilder, ty, None, num_clauses as c_uint, UNNAMED)