1 use crate::common::Funclet;
2 use crate::context::CodegenCx;
3 use crate::llvm::{self, BasicBlock, False};
4 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};
32 // All Builders must have an llfn associated with them
34 pub struct Builder<'a, 'll, 'tcx> {
35 pub llbuilder: &'ll mut llvm::Builder<'ll>,
36 pub cx: &'a CodegenCx<'ll, 'tcx>,
39 impl Drop for Builder<'_, '_, '_> {
42 llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
47 // FIXME(eddyb) use a checked constructor when they become `const fn`.
48 const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
50 /// Empty string, to be used where LLVM expects an instruction name, indicating
51 /// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
52 // FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
53 const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
55 impl<'ll, 'tcx> BackendTypes for Builder<'_, 'll, 'tcx> {
56 type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
57 type Function = <CodegenCx<'ll, 'tcx> as BackendTypes>::Function;
58 type BasicBlock = <CodegenCx<'ll, 'tcx> as BackendTypes>::BasicBlock;
59 type Type = <CodegenCx<'ll, 'tcx> as BackendTypes>::Type;
60 type Funclet = <CodegenCx<'ll, 'tcx> as BackendTypes>::Funclet;
62 type DIScope = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIScope;
63 type DILocation = <CodegenCx<'ll, 'tcx> as BackendTypes>::DILocation;
64 type DIVariable = <CodegenCx<'ll, 'tcx> as BackendTypes>::DIVariable;
67 impl abi::HasDataLayout for Builder<'_, '_, '_> {
68 fn data_layout(&self) -> &abi::TargetDataLayout {
73 impl<'tcx> ty::layout::HasTyCtxt<'tcx> for Builder<'_, '_, 'tcx> {
75 fn tcx(&self) -> TyCtxt<'tcx> {
80 impl<'tcx> ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
81 fn param_env(&self) -> ty::ParamEnv<'tcx> {
86 impl HasTargetSpec for Builder<'_, '_, '_> {
88 fn target_spec(&self) -> &Target {
93 impl<'tcx> LayoutOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
94 type LayoutOfResult = TyAndLayout<'tcx>;
97 fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
98 self.cx.handle_layout_err(err, span, ty)
102 impl<'tcx> FnAbiOfHelpers<'tcx> for Builder<'_, '_, 'tcx> {
103 type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;
106 fn handle_fn_abi_err(
108 err: FnAbiError<'tcx>,
110 fn_abi_request: FnAbiRequest<'tcx>,
112 self.cx.handle_fn_abi_err(err, span, fn_abi_request)
116 impl<'ll, 'tcx> Deref for Builder<'_, 'll, 'tcx> {
117 type Target = CodegenCx<'ll, 'tcx>;
120 fn deref(&self) -> &Self::Target {
125 impl<'ll, 'tcx> HasCodegen<'tcx> for Builder<'_, 'll, 'tcx> {
126 type CodegenCx = CodegenCx<'ll, 'tcx>;
129 macro_rules! builder_methods_for_value_instructions {
130 ($($name:ident($($arg:ident),*) => $llvm_capi:ident),+ $(,)?) => {
131 $(fn $name(&mut self, $($arg: &'ll Value),*) -> &'ll Value {
133 llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
139 impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
140 fn build(cx: &'a CodegenCx<'ll, 'tcx>, llbb: &'ll BasicBlock) -> Self {
141 let bx = Builder::with_cx(cx);
143 llvm::LLVMPositionBuilderAtEnd(bx.llbuilder, llbb);
148 fn cx(&self) -> &CodegenCx<'ll, 'tcx> {
152 fn llbb(&self) -> &'ll BasicBlock {
153 unsafe { llvm::LLVMGetInsertBlock(self.llbuilder) }
156 fn set_span(&mut self, _span: Span) {}
158 fn append_block(cx: &'a CodegenCx<'ll, 'tcx>, llfn: &'ll Value, name: &str) -> &'ll BasicBlock {
160 let name = SmallCStr::new(name);
161 llvm::LLVMAppendBasicBlockInContext(cx.llcx, llfn, name.as_ptr())
165 fn append_sibling_block(&mut self, name: &str) -> &'ll BasicBlock {
166 Self::append_block(self.cx, self.llfn(), name)
169 fn switch_to_block(&mut self, llbb: Self::BasicBlock) {
170 *self = Self::build(self.cx, llbb)
173 fn ret_void(&mut self) {
175 llvm::LLVMBuildRetVoid(self.llbuilder);
179 fn ret(&mut self, v: &'ll Value) {
181 llvm::LLVMBuildRet(self.llbuilder, v);
185 fn br(&mut self, dest: &'ll BasicBlock) {
187 llvm::LLVMBuildBr(self.llbuilder, dest);
194 then_llbb: &'ll BasicBlock,
195 else_llbb: &'ll BasicBlock,
198 llvm::LLVMBuildCondBr(self.llbuilder, cond, then_llbb, else_llbb);
205 else_llbb: &'ll BasicBlock,
206 cases: impl ExactSizeIterator<Item = (u128, &'ll BasicBlock)>,
209 unsafe { llvm::LLVMBuildSwitch(self.llbuilder, v, else_llbb, cases.len() as c_uint) };
210 for (on_val, dest) in cases {
211 let on_val = self.const_uint_big(self.val_ty(v), on_val);
212 unsafe { llvm::LLVMAddCase(switch, on_val, dest) }
221 then: &'ll BasicBlock,
222 catch: &'ll BasicBlock,
223 funclet: Option<&Funclet<'ll>>,
225 debug!("invoke {:?} with args ({:?})", llfn, args);
227 let args = self.check_call("invoke", llty, llfn, args);
228 let bundle = funclet.map(|funclet| funclet.bundle());
229 let bundle = bundle.as_ref().map(|b| &*b.raw);
232 llvm::LLVMRustBuildInvoke(
237 args.len() as c_uint,
246 fn unreachable(&mut self) {
248 llvm::LLVMBuildUnreachable(self.llbuilder);
252 builder_methods_for_value_instructions! {
253 add(a, b) => LLVMBuildAdd,
254 fadd(a, b) => LLVMBuildFAdd,
255 sub(a, b) => LLVMBuildSub,
256 fsub(a, b) => LLVMBuildFSub,
257 mul(a, b) => LLVMBuildMul,
258 fmul(a, b) => LLVMBuildFMul,
259 udiv(a, b) => LLVMBuildUDiv,
260 exactudiv(a, b) => LLVMBuildExactUDiv,
261 sdiv(a, b) => LLVMBuildSDiv,
262 exactsdiv(a, b) => LLVMBuildExactSDiv,
263 fdiv(a, b) => LLVMBuildFDiv,
264 urem(a, b) => LLVMBuildURem,
265 srem(a, b) => LLVMBuildSRem,
266 frem(a, b) => LLVMBuildFRem,
267 shl(a, b) => LLVMBuildShl,
268 lshr(a, b) => LLVMBuildLShr,
269 ashr(a, b) => LLVMBuildAShr,
270 and(a, b) => LLVMBuildAnd,
271 or(a, b) => LLVMBuildOr,
272 xor(a, b) => LLVMBuildXor,
273 neg(x) => LLVMBuildNeg,
274 fneg(x) => LLVMBuildFNeg,
275 not(x) => LLVMBuildNot,
276 unchecked_sadd(x, y) => LLVMBuildNSWAdd,
277 unchecked_uadd(x, y) => LLVMBuildNUWAdd,
278 unchecked_ssub(x, y) => LLVMBuildNSWSub,
279 unchecked_usub(x, y) => LLVMBuildNUWSub,
280 unchecked_smul(x, y) => LLVMBuildNSWMul,
281 unchecked_umul(x, y) => LLVMBuildNUWMul,
284 fn fadd_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
286 let instr = llvm::LLVMBuildFAdd(self.llbuilder, lhs, rhs, UNNAMED);
287 llvm::LLVMRustSetFastMath(instr);
292 fn fsub_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
294 let instr = llvm::LLVMBuildFSub(self.llbuilder, lhs, rhs, UNNAMED);
295 llvm::LLVMRustSetFastMath(instr);
300 fn fmul_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
302 let instr = llvm::LLVMBuildFMul(self.llbuilder, lhs, rhs, UNNAMED);
303 llvm::LLVMRustSetFastMath(instr);
308 fn fdiv_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
310 let instr = llvm::LLVMBuildFDiv(self.llbuilder, lhs, rhs, UNNAMED);
311 llvm::LLVMRustSetFastMath(instr);
316 fn frem_fast(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
318 let instr = llvm::LLVMBuildFRem(self.llbuilder, lhs, rhs, UNNAMED);
319 llvm::LLVMRustSetFastMath(instr);
330 ) -> (Self::Value, Self::Value) {
331 use rustc_middle::ty::{Int, Uint};
332 use rustc_middle::ty::{IntTy::*, UintTy::*};
334 let new_kind = match ty.kind() {
335 Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
336 Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
337 t @ (Uint(_) | Int(_)) => t.clone(),
338 _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
341 let name = match oop {
342 OverflowOp::Add => match new_kind {
343 Int(I8) => "llvm.sadd.with.overflow.i8",
344 Int(I16) => "llvm.sadd.with.overflow.i16",
345 Int(I32) => "llvm.sadd.with.overflow.i32",
346 Int(I64) => "llvm.sadd.with.overflow.i64",
347 Int(I128) => "llvm.sadd.with.overflow.i128",
349 Uint(U8) => "llvm.uadd.with.overflow.i8",
350 Uint(U16) => "llvm.uadd.with.overflow.i16",
351 Uint(U32) => "llvm.uadd.with.overflow.i32",
352 Uint(U64) => "llvm.uadd.with.overflow.i64",
353 Uint(U128) => "llvm.uadd.with.overflow.i128",
357 OverflowOp::Sub => match new_kind {
358 Int(I8) => "llvm.ssub.with.overflow.i8",
359 Int(I16) => "llvm.ssub.with.overflow.i16",
360 Int(I32) => "llvm.ssub.with.overflow.i32",
361 Int(I64) => "llvm.ssub.with.overflow.i64",
362 Int(I128) => "llvm.ssub.with.overflow.i128",
364 Uint(U8) => "llvm.usub.with.overflow.i8",
365 Uint(U16) => "llvm.usub.with.overflow.i16",
366 Uint(U32) => "llvm.usub.with.overflow.i32",
367 Uint(U64) => "llvm.usub.with.overflow.i64",
368 Uint(U128) => "llvm.usub.with.overflow.i128",
372 OverflowOp::Mul => match new_kind {
373 Int(I8) => "llvm.smul.with.overflow.i8",
374 Int(I16) => "llvm.smul.with.overflow.i16",
375 Int(I32) => "llvm.smul.with.overflow.i32",
376 Int(I64) => "llvm.smul.with.overflow.i64",
377 Int(I128) => "llvm.smul.with.overflow.i128",
379 Uint(U8) => "llvm.umul.with.overflow.i8",
380 Uint(U16) => "llvm.umul.with.overflow.i16",
381 Uint(U32) => "llvm.umul.with.overflow.i32",
382 Uint(U64) => "llvm.umul.with.overflow.i64",
383 Uint(U128) => "llvm.umul.with.overflow.i128",
389 let res = self.call_intrinsic(name, &[lhs, rhs]);
390 (self.extract_value(res, 0), self.extract_value(res, 1))
393 fn from_immediate(&mut self, val: Self::Value) -> Self::Value {
394 if self.cx().val_ty(val) == self.cx().type_i1() {
395 self.zext(val, self.cx().type_i8())
400 fn to_immediate_scalar(&mut self, val: Self::Value, scalar: abi::Scalar) -> Self::Value {
401 if scalar.is_bool() {
402 return self.trunc(val, self.cx().type_i1());
407 fn alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
408 let mut bx = Builder::with_cx(self.cx);
409 bx.position_at_start(unsafe { llvm::LLVMGetFirstBasicBlock(self.llfn()) });
410 bx.dynamic_alloca(ty, align)
413 fn dynamic_alloca(&mut self, ty: &'ll Type, align: Align) -> &'ll Value {
415 let alloca = llvm::LLVMBuildAlloca(self.llbuilder, ty, UNNAMED);
416 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
421 fn array_alloca(&mut self, ty: &'ll Type, len: &'ll Value, align: Align) -> &'ll Value {
423 let alloca = llvm::LLVMBuildArrayAlloca(self.llbuilder, ty, len, UNNAMED);
424 llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint);
429 fn load(&mut self, ty: &'ll Type, ptr: &'ll Value, align: Align) -> &'ll Value {
431 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
432 llvm::LLVMSetAlignment(load, align.bytes() as c_uint);
437 fn volatile_load(&mut self, ty: &'ll Type, ptr: &'ll Value) -> &'ll Value {
439 let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED);
440 llvm::LLVMSetVolatile(load, llvm::True);
449 order: rustc_codegen_ssa::common::AtomicOrdering,
453 let load = llvm::LLVMRustBuildAtomicLoad(
458 AtomicOrdering::from_generic(order),
460 // LLVM requires the alignment of atomic loads to be at least the size of the type.
461 llvm::LLVMSetAlignment(load, size.bytes() as c_uint);
466 fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
467 debug!("PlaceRef::load: {:?}", place);
469 assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
471 if place.layout.is_zst() {
472 return OperandRef::new_zst(self, place.layout);
475 fn scalar_load_metadata<'a, 'll, 'tcx>(
476 bx: &mut Builder<'a, 'll, 'tcx>,
482 if !scalar.is_always_valid(bx) {
483 bx.range_metadata(load, scalar.valid_range);
486 abi::Pointer if !scalar.valid_range.contains(0) => {
487 bx.nonnull_metadata(load);
493 let val = if let Some(llextra) = place.llextra {
494 OperandValue::Ref(place.llval, Some(llextra), place.align)
495 } else if place.layout.is_llvm_immediate() {
496 let mut const_llval = None;
498 if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
499 if llvm::LLVMIsGlobalConstant(global) == llvm::True {
500 const_llval = llvm::LLVMGetInitializer(global);
504 let llval = const_llval.unwrap_or_else(|| {
505 let load = self.load(place.layout.llvm_type(self), place.llval, place.align);
506 if let abi::Abi::Scalar(scalar) = place.layout.abi {
507 scalar_load_metadata(self, load, scalar);
511 OperandValue::Immediate(self.to_immediate(llval, place.layout))
512 } else if let abi::Abi::ScalarPair(a, b) = place.layout.abi {
513 let b_offset = a.value.size(self).align_to(b.value.align(self).abi);
514 let pair_ty = place.layout.llvm_type(self);
516 let mut load = |i, scalar: abi::Scalar, align| {
517 let llptr = self.struct_gep(pair_ty, place.llval, i as u64);
518 let llty = place.layout.scalar_pair_element_llvm_type(self, i, false);
519 let load = self.load(llty, llptr, align);
520 scalar_load_metadata(self, load, scalar);
521 self.to_immediate_scalar(load, scalar)
525 load(0, a, place.align),
526 load(1, b, place.align.restrict_for_offset(b_offset)),
529 OperandValue::Ref(place.llval, None, place.align)
532 OperandRef { val, layout: place.layout }
535 fn write_operand_repeatedly(
537 cg_elem: OperandRef<'tcx, &'ll Value>,
539 dest: PlaceRef<'tcx, &'ll Value>,
541 let zero = self.const_usize(0);
542 let count = self.const_usize(count);
543 let start = dest.project_index(&mut self, zero).llval;
544 let end = dest.project_index(&mut self, count).llval;
546 let header_bb = self.append_sibling_block("repeat_loop_header");
547 let body_bb = self.append_sibling_block("repeat_loop_body");
548 let next_bb = self.append_sibling_block("repeat_loop_next");
552 let mut header_bx = Self::build(self.cx, header_bb);
553 let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
555 let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
556 header_bx.cond_br(keep_going, body_bb, next_bb);
558 let mut body_bx = Self::build(self.cx, body_bb);
559 let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
562 .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
564 let next = body_bx.inbounds_gep(
565 self.backend_type(cg_elem.layout),
567 &[self.const_usize(1)],
569 body_bx.br(header_bb);
570 header_bx.add_incoming_to_phi(current, next, body_bb);
572 Self::build(self.cx, next_bb)
575 fn range_metadata(&mut self, load: &'ll Value, range: WrappingRange) {
576 if self.sess().target.arch == "amdgpu" {
577 // amdgpu/LLVM does something weird and thinks an i64 value is
578 // split into a v2i32, halving the bitwidth LLVM expects,
579 // tripping an assertion. So, for now, just disable this
585 let llty = self.cx.val_ty(load);
587 self.cx.const_uint_big(llty, range.start),
588 self.cx.const_uint_big(llty, range.end.wrapping_add(1)),
591 llvm::LLVMSetMetadata(
593 llvm::MD_range as c_uint,
594 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
599 fn nonnull_metadata(&mut self, load: &'ll Value) {
601 llvm::LLVMSetMetadata(
603 llvm::MD_nonnull as c_uint,
604 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
609 fn type_metadata(&mut self, function: &'ll Value, typeid: String) {
610 let typeid_metadata = self.typeid_metadata(typeid);
611 let v = [self.const_usize(0), typeid_metadata];
613 llvm::LLVMGlobalSetMetadata(
615 llvm::MD_type as c_uint,
616 llvm::LLVMValueAsMetadata(llvm::LLVMMDNodeInContext(
625 fn typeid_metadata(&mut self, typeid: String) -> Self::Value {
627 llvm::LLVMMDStringInContext(
629 typeid.as_ptr() as *const c_char,
630 typeid.as_bytes().len() as c_uint,
635 fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
636 self.store_with_flags(val, ptr, align, MemFlags::empty())
646 debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
647 let ptr = self.check_store(val, ptr);
649 let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
651 if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
652 llvm::LLVMSetAlignment(store, align);
653 if flags.contains(MemFlags::VOLATILE) {
654 llvm::LLVMSetVolatile(store, llvm::True);
656 if flags.contains(MemFlags::NONTEMPORAL) {
657 // According to LLVM [1] building a nontemporal store must
658 // *always* point to a metadata value of the integer 1.
660 // [1]: https://llvm.org/docs/LangRef.html#store-instruction
661 let one = self.cx.const_i32(1);
662 let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
663 llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
673 order: rustc_codegen_ssa::common::AtomicOrdering,
676 debug!("Store {:?} -> {:?}", val, ptr);
677 let ptr = self.check_store(val, ptr);
679 let store = llvm::LLVMRustBuildAtomicStore(
683 AtomicOrdering::from_generic(order),
685 // LLVM requires the alignment of atomic stores to be at least the size of the type.
686 llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
690 fn gep(&mut self, ty: &'ll Type, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
697 indices.len() as c_uint,
707 indices: &[&'ll Value],
710 llvm::LLVMBuildInBoundsGEP2(
715 indices.len() as c_uint,
721 fn struct_gep(&mut self, ty: &'ll Type, ptr: &'ll Value, idx: u64) -> &'ll Value {
722 assert_eq!(idx as c_uint as u64, idx);
723 unsafe { llvm::LLVMBuildStructGEP2(self.llbuilder, ty, ptr, idx as c_uint, UNNAMED) }
727 fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
728 unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
731 fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
732 unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
735 fn fptoui_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
736 self.fptoint_sat(false, val, dest_ty)
739 fn fptosi_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
740 self.fptoint_sat(true, val, dest_ty)
743 fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
744 // On WebAssembly the `fptoui` and `fptosi` instructions currently have
745 // poor codegen. The reason for this is that the corresponding wasm
746 // instructions, `i32.trunc_f32_s` for example, will trap when the float
747 // is out-of-bounds, infinity, or nan. This means that LLVM
748 // automatically inserts control flow around `fptoui` and `fptosi`
749 // because the LLVM instruction `fptoui` is defined as producing a
750 // poison value, not having UB on out-of-bounds values.
752 // This method, however, is only used with non-saturating casts that
753 // have UB on out-of-bounds values. This means that it's ok if we use
754 // the raw wasm instruction since out-of-bounds values can do whatever
755 // we like. To ensure that LLVM picks the right instruction we choose
756 // the raw wasm intrinsic functions which avoid LLVM inserting all the
757 // other control flow automatically.
758 if self.sess().target.is_like_wasm {
759 let src_ty = self.cx.val_ty(val);
760 if self.cx.type_kind(src_ty) != TypeKind::Vector {
761 let float_width = self.cx.float_width(src_ty);
762 let int_width = self.cx.int_width(dest_ty);
763 let name = match (int_width, float_width) {
764 (32, 32) => Some("llvm.wasm.trunc.unsigned.i32.f32"),
765 (32, 64) => Some("llvm.wasm.trunc.unsigned.i32.f64"),
766 (64, 32) => Some("llvm.wasm.trunc.unsigned.i64.f32"),
767 (64, 64) => Some("llvm.wasm.trunc.unsigned.i64.f64"),
770 if let Some(name) = name {
771 return self.call_intrinsic(name, &[val]);
775 unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
778 fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
779 // see `fptoui` above for why wasm is different here
780 if self.sess().target.is_like_wasm {
781 let src_ty = self.cx.val_ty(val);
782 if self.cx.type_kind(src_ty) != TypeKind::Vector {
783 let float_width = self.cx.float_width(src_ty);
784 let int_width = self.cx.int_width(dest_ty);
785 let name = match (int_width, float_width) {
786 (32, 32) => Some("llvm.wasm.trunc.signed.i32.f32"),
787 (32, 64) => Some("llvm.wasm.trunc.signed.i32.f64"),
788 (64, 32) => Some("llvm.wasm.trunc.signed.i64.f32"),
789 (64, 64) => Some("llvm.wasm.trunc.signed.i64.f64"),
792 if let Some(name) = name {
793 return self.call_intrinsic(name, &[val]);
797 unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
800 fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
801 unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
804 fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
805 unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
808 fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
809 unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
812 fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
813 unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
816 fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
817 unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
820 fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
821 unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
824 fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
825 unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
828 fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
829 unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
832 fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
833 unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
837 fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
838 let op = llvm::IntPredicate::from_generic(op);
839 unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
842 fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
843 let op = llvm::RealPredicate::from_generic(op);
844 unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
847 /* Miscellaneous instructions */
857 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
858 let size = self.intcast(size, self.type_isize(), false);
859 let is_volatile = flags.contains(MemFlags::VOLATILE);
860 let dst = self.pointercast(dst, self.type_i8p());
861 let src = self.pointercast(src, self.type_i8p());
863 llvm::LLVMRustBuildMemCpy(
866 dst_align.bytes() as c_uint,
868 src_align.bytes() as c_uint,
884 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memmove not supported");
885 let size = self.intcast(size, self.type_isize(), false);
886 let is_volatile = flags.contains(MemFlags::VOLATILE);
887 let dst = self.pointercast(dst, self.type_i8p());
888 let src = self.pointercast(src, self.type_i8p());
890 llvm::LLVMRustBuildMemMove(
893 dst_align.bytes() as c_uint,
895 src_align.bytes() as c_uint,
905 fill_byte: &'ll Value,
910 let is_volatile = flags.contains(MemFlags::VOLATILE);
911 let ptr = self.pointercast(ptr, self.type_i8p());
913 llvm::LLVMRustBuildMemSet(
916 align.bytes() as c_uint,
927 then_val: &'ll Value,
928 else_val: &'ll Value,
930 unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
933 fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
934 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
937 fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
938 unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
941 fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
943 let elt_ty = self.cx.val_ty(elt);
944 let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
945 let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
946 let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
947 self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
951 fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
952 assert_eq!(idx as c_uint as u64, idx);
953 unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
956 fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
957 assert_eq!(idx as c_uint as u64, idx);
958 unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
961 fn set_personality_fn(&mut self, personality: &'ll Value) {
963 llvm::LLVMSetPersonalityFn(self.llfn(), personality);
967 fn cleanup_landing_pad(&mut self, ty: &'ll Type, pers_fn: &'ll Value) -> &'ll Value {
968 let landing_pad = self.landing_pad(ty, pers_fn, 1 /* FIXME should this be 0? */);
970 llvm::LLVMSetCleanup(landing_pad, llvm::True);
975 fn resume(&mut self, exn: &'ll Value) {
977 llvm::LLVMBuildResume(self.llbuilder, exn);
981 fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
982 let name = cstr!("cleanuppad");
984 llvm::LLVMRustBuildCleanupPad(
987 args.len() as c_uint,
992 Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
995 fn cleanup_ret(&mut self, funclet: &Funclet<'ll>, unwind: Option<&'ll BasicBlock>) {
997 llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind)
998 .expect("LLVM does not have support for cleanupret");
1002 fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
1003 let name = cstr!("catchpad");
1005 llvm::LLVMRustBuildCatchPad(
1008 args.len() as c_uint,
1013 Funclet::new(ret.expect("LLVM does not have support for catchpad"))
1018 parent: Option<&'ll Value>,
1019 unwind: Option<&'ll BasicBlock>,
1020 handlers: &[&'ll BasicBlock],
1022 let name = cstr!("catchswitch");
1024 llvm::LLVMRustBuildCatchSwitch(
1028 handlers.len() as c_uint,
1032 let ret = ret.expect("LLVM does not have support for catchswitch");
1033 for handler in handlers {
1035 llvm::LLVMRustAddHandler(ret, handler);
1041 // Atomic Operations
1047 order: rustc_codegen_ssa::common::AtomicOrdering,
1048 failure_order: rustc_codegen_ssa::common::AtomicOrdering,
1051 let weak = if weak { llvm::True } else { llvm::False };
1053 llvm::LLVMRustBuildAtomicCmpXchg(
1058 AtomicOrdering::from_generic(order),
1059 AtomicOrdering::from_generic(failure_order),
1066 op: rustc_codegen_ssa::common::AtomicRmwBinOp,
1069 order: rustc_codegen_ssa::common::AtomicOrdering,
1072 llvm::LLVMBuildAtomicRMW(
1074 AtomicRmwBinOp::from_generic(op),
1077 AtomicOrdering::from_generic(order),
1085 order: rustc_codegen_ssa::common::AtomicOrdering,
1086 scope: rustc_codegen_ssa::common::SynchronizationScope,
1089 llvm::LLVMRustBuildAtomicFence(
1091 AtomicOrdering::from_generic(order),
1092 SynchronizationScope::from_generic(scope),
1097 fn set_invariant_load(&mut self, load: &'ll Value) {
1099 llvm::LLVMSetMetadata(
1101 llvm::MD_invariant_load as c_uint,
1102 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1107 fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
1108 self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
1111 fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
1112 self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
1115 fn instrprof_increment(
1117 fn_name: &'ll Value,
1119 num_counters: &'ll Value,
1123 "instrprof_increment() with args ({:?}, {:?}, {:?}, {:?})",
1124 fn_name, hash, num_counters, index
1127 let llfn = unsafe { llvm::LLVMRustGetInstrProfIncrementIntrinsic(self.cx().llmod) };
1128 let llty = self.cx.type_func(
1129 &[self.cx.type_i8p(), self.cx.type_i64(), self.cx.type_i32(), self.cx.type_i32()],
1130 self.cx.type_void(),
1132 let args = &[fn_name, hash, num_counters, index];
1133 let args = self.check_call("call", llty, llfn, args);
1136 let _ = llvm::LLVMRustBuildCall(
1140 args.as_ptr() as *const &llvm::Value,
1141 args.len() as c_uint,
1151 args: &[&'ll Value],
1152 funclet: Option<&Funclet<'ll>>,
1154 debug!("call {:?} with args ({:?})", llfn, args);
1156 let args = self.check_call("call", llty, llfn, args);
1157 let bundle = funclet.map(|funclet| funclet.bundle());
1158 let bundle = bundle.as_ref().map(|b| &*b.raw);
1161 llvm::LLVMRustBuildCall(
1165 args.as_ptr() as *const &llvm::Value,
1166 args.len() as c_uint,
1172 fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1173 unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
1176 fn apply_attrs_to_cleanup_callsite(&mut self, llret: &'ll Value) {
1177 // Cleanup is always the cold path.
1178 llvm::Attribute::Cold.apply_callsite(llvm::AttributePlace::Function, llret);
1180 // In LLVM versions with deferred inlining (currently, system LLVM < 14),
1181 // inlining drop glue can lead to exponential size blowup, see #41696 and #92110.
1182 if !llvm_util::is_rust_llvm() && llvm_util::get_version() < (14, 0, 0) {
1183 llvm::Attribute::NoInline.apply_callsite(llvm::AttributePlace::Function, llret);
1188 impl<'ll> StaticBuilderMethods for Builder<'_, 'll, '_> {
1189 fn get_static(&mut self, def_id: DefId) -> &'ll Value {
1190 // Forward to the `get_static` method of `CodegenCx`
1191 self.cx().get_static(def_id)
1195 impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
1196 fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
1197 // Create a fresh builder from the crate context.
1198 let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
1199 Builder { llbuilder, cx }
1202 pub fn llfn(&self) -> &'ll Value {
1203 unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
1206 fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
1208 llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
1212 pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1213 unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
1216 pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1217 unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
1220 pub fn insert_element(
1226 unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
1229 pub fn shuffle_vector(
1235 unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
1238 pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1239 unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
1241 pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1242 unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
1244 pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1246 let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
1247 llvm::LLVMRustSetFastMath(instr);
1251 pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1253 let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
1254 llvm::LLVMRustSetFastMath(instr);
1258 pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
1259 unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
1261 pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
1262 unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
1264 pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
1265 unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
1267 pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
1268 unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
1270 pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
1271 unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
1273 pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
1275 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
1278 pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
1280 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
1283 pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
1286 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
1287 llvm::LLVMRustSetFastMath(instr);
1291 pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
1294 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
1295 llvm::LLVMRustSetFastMath(instr);
1299 pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1300 unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
1302 pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1303 unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
1306 pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
1308 llvm::LLVMAddClause(landing_pad, clause);
1312 pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
1314 unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
1315 ret.expect("LLVM does not have support for catchret")
1318 fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
1319 let dest_ptr_ty = self.cx.val_ty(ptr);
1320 let stored_ty = self.cx.val_ty(val);
1321 let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
1323 assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
1325 if dest_ptr_ty == stored_ptr_ty {
1329 "type mismatch in store. \
1330 Expected {:?}, got {:?}; inserting bitcast",
1331 dest_ptr_ty, stored_ptr_ty
1333 self.bitcast(ptr, stored_ptr_ty)
1342 args: &'b [&'ll Value],
1343 ) -> Cow<'b, [&'ll Value]> {
1345 self.cx.type_kind(fn_ty) == TypeKind::Function,
1346 "builder::{} not passed a function, but {:?}",
1351 let param_tys = self.cx.func_params_types(fn_ty);
1353 let all_args_match = iter::zip(¶m_tys, args.iter().map(|&v| self.val_ty(v)))
1354 .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
1357 return Cow::Borrowed(args);
1360 let casted_args: Vec<_> = iter::zip(param_tys, args)
1362 .map(|(i, (expected_ty, &actual_val))| {
1363 let actual_ty = self.val_ty(actual_val);
1364 if expected_ty != actual_ty {
1366 "type mismatch in function call of {:?}. \
1367 Expected {:?} for param {}, got {:?}; injecting bitcast",
1368 llfn, expected_ty, i, actual_ty
1370 self.bitcast(actual_val, expected_ty)
1377 Cow::Owned(casted_args)
1380 pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
1381 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
1384 crate fn call_intrinsic(&mut self, intrinsic: &str, args: &[&'ll Value]) -> &'ll Value {
1385 let (ty, f) = self.cx.get_intrinsic(intrinsic);
1386 self.call(ty, f, args, None)
1389 fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
1390 let size = size.bytes();
1395 if !self.cx().sess().emit_lifetime_markers() {
1399 let ptr = self.pointercast(ptr, self.cx.type_i8p());
1400 self.call_intrinsic(intrinsic, &[self.cx.const_u64(size), ptr]);
1406 vals: &[&'ll Value],
1407 bbs: &[&'ll BasicBlock],
1409 assert_eq!(vals.len(), bbs.len());
1410 let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
1412 llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
1417 fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
1419 llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
1423 fn fptoint_sat_broken_in_llvm(&self) -> bool {
1424 match self.tcx.sess.target.arch.as_str() {
1425 // FIXME - https://bugs.llvm.org/show_bug.cgi?id=50083
1426 "riscv64" => llvm_util::get_version() < (13, 0, 0),
1436 ) -> Option<&'ll Value> {
1437 if !self.fptoint_sat_broken_in_llvm() {
1438 let src_ty = self.cx.val_ty(val);
1439 let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector
1441 assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
1443 self.cx.element_type(src_ty),
1444 self.cx.element_type(dest_ty),
1445 Some(self.cx.vector_length(src_ty)),
1448 (src_ty, dest_ty, None)
1450 let float_width = self.cx.float_width(float_ty);
1451 let int_width = self.cx.int_width(int_ty);
1453 let instr = if signed { "fptosi" } else { "fptoui" };
1454 let name = if let Some(vector_length) = vector_length {
1456 "llvm.{}.sat.v{}i{}.v{}f{}",
1457 instr, vector_length, int_width, vector_length, float_width
1460 format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
1463 self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
1464 Some(self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None))
1470 pub(crate) fn landing_pad(
1473 pers_fn: &'ll Value,
1476 // Use LLVMSetPersonalityFn to set the personality. It supports arbitrary Consts while,
1477 // LLVMBuildLandingPad requires the argument to be a Function (as of LLVM 12). The
1478 // personality lives on the parent function anyway.
1479 self.set_personality_fn(pers_fn);
1481 llvm::LLVMBuildLandingPad(self.llbuilder, ty, None, num_clauses as c_uint, UNNAMED)