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};
30 use tracing::{debug, instrument};
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 #[instrument(level = "trace", skip(self))]
467 fn load_operand(&mut self, place: PlaceRef<'tcx, &'ll Value>) -> OperandRef<'tcx, &'ll Value> {
468 assert_eq!(place.llextra.is_some(), place.layout.is_unsized());
470 if place.layout.is_zst() {
471 return OperandRef::new_zst(self, place.layout);
474 #[instrument(level = "trace", skip(bx))]
475 fn scalar_load_metadata<'a, 'll, 'tcx>(
476 bx: &mut Builder<'a, 'll, 'tcx>,
479 layout: TyAndLayout<'tcx>,
482 if !scalar.is_always_valid(bx) {
483 bx.noundef_metadata(load);
486 match scalar.primitive() {
488 if !scalar.is_always_valid(bx) {
489 bx.range_metadata(load, scalar.valid_range(bx));
493 if !scalar.valid_range(bx).contains(0) {
494 bx.nonnull_metadata(load);
497 if let Some(pointee) = layout.pointee_info_at(bx, offset) {
498 if let Some(_) = pointee.safe {
499 bx.align_metadata(load, pointee.align);
503 abi::F32 | abi::F64 => {}
507 let val = if let Some(llextra) = place.llextra {
508 OperandValue::Ref(place.llval, Some(llextra), place.align)
509 } else if place.layout.is_llvm_immediate() {
510 let mut const_llval = None;
511 let llty = place.layout.llvm_type(self);
513 if let Some(global) = llvm::LLVMIsAGlobalVariable(place.llval) {
514 if llvm::LLVMIsGlobalConstant(global) == llvm::True {
515 if let Some(init) = llvm::LLVMGetInitializer(global) {
516 if self.val_ty(init) == llty {
517 const_llval = Some(init);
523 let llval = const_llval.unwrap_or_else(|| {
524 let load = self.load(llty, place.llval, place.align);
525 if let abi::Abi::Scalar(scalar) = place.layout.abi {
526 scalar_load_metadata(self, load, scalar, place.layout, Size::ZERO);
530 OperandValue::Immediate(self.to_immediate(llval, place.layout))
531 } else if let abi::Abi::ScalarPair(a, b) = place.layout.abi {
532 let b_offset = a.size(self).align_to(b.align(self).abi);
533 let pair_ty = place.layout.llvm_type(self);
535 let mut load = |i, scalar: abi::Scalar, layout, align, offset| {
536 let llptr = self.struct_gep(pair_ty, place.llval, i as u64);
537 let llty = place.layout.scalar_pair_element_llvm_type(self, i, false);
538 let load = self.load(llty, llptr, align);
539 scalar_load_metadata(self, load, scalar, layout, offset);
540 self.to_immediate_scalar(load, scalar)
544 load(0, a, place.layout, place.align, Size::ZERO),
545 load(1, b, place.layout, place.align.restrict_for_offset(b_offset), b_offset),
548 OperandValue::Ref(place.llval, None, place.align)
551 OperandRef { val, layout: place.layout }
554 fn write_operand_repeatedly(
556 cg_elem: OperandRef<'tcx, &'ll Value>,
558 dest: PlaceRef<'tcx, &'ll Value>,
560 let zero = self.const_usize(0);
561 let count = self.const_usize(count);
562 let start = dest.project_index(&mut self, zero).llval;
563 let end = dest.project_index(&mut self, count).llval;
565 let header_bb = self.append_sibling_block("repeat_loop_header");
566 let body_bb = self.append_sibling_block("repeat_loop_body");
567 let next_bb = self.append_sibling_block("repeat_loop_next");
571 let mut header_bx = Self::build(self.cx, header_bb);
572 let current = header_bx.phi(self.val_ty(start), &[start], &[self.llbb()]);
574 let keep_going = header_bx.icmp(IntPredicate::IntNE, current, end);
575 header_bx.cond_br(keep_going, body_bb, next_bb);
577 let mut body_bx = Self::build(self.cx, body_bb);
578 let align = dest.align.restrict_for_offset(dest.layout.field(self.cx(), 0).size);
581 .store(&mut body_bx, PlaceRef::new_sized_aligned(current, cg_elem.layout, align));
583 let next = body_bx.inbounds_gep(
584 self.backend_type(cg_elem.layout),
586 &[self.const_usize(1)],
588 body_bx.br(header_bb);
589 header_bx.add_incoming_to_phi(current, next, body_bb);
591 Self::build(self.cx, next_bb)
594 fn range_metadata(&mut self, load: &'ll Value, range: WrappingRange) {
595 if self.sess().target.arch == "amdgpu" {
596 // amdgpu/LLVM does something weird and thinks an i64 value is
597 // split into a v2i32, halving the bitwidth LLVM expects,
598 // tripping an assertion. So, for now, just disable this
604 let llty = self.cx.val_ty(load);
606 self.cx.const_uint_big(llty, range.start),
607 self.cx.const_uint_big(llty, range.end.wrapping_add(1)),
610 llvm::LLVMSetMetadata(
612 llvm::MD_range as c_uint,
613 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
618 fn nonnull_metadata(&mut self, load: &'ll Value) {
620 llvm::LLVMSetMetadata(
622 llvm::MD_nonnull as c_uint,
623 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
628 fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value {
629 self.store_with_flags(val, ptr, align, MemFlags::empty())
639 debug!("Store {:?} -> {:?} ({:?})", val, ptr, flags);
640 let ptr = self.check_store(val, ptr);
642 let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr);
644 if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint };
645 llvm::LLVMSetAlignment(store, align);
646 if flags.contains(MemFlags::VOLATILE) {
647 llvm::LLVMSetVolatile(store, llvm::True);
649 if flags.contains(MemFlags::NONTEMPORAL) {
650 // According to LLVM [1] building a nontemporal store must
651 // *always* point to a metadata value of the integer 1.
653 // [1]: https://llvm.org/docs/LangRef.html#store-instruction
654 let one = self.cx.const_i32(1);
655 let node = llvm::LLVMMDNodeInContext(self.cx.llcx, &one, 1);
656 llvm::LLVMSetMetadata(store, llvm::MD_nontemporal as c_uint, node);
666 order: rustc_codegen_ssa::common::AtomicOrdering,
669 debug!("Store {:?} -> {:?}", val, ptr);
670 let ptr = self.check_store(val, ptr);
672 let store = llvm::LLVMRustBuildAtomicStore(
676 AtomicOrdering::from_generic(order),
678 // LLVM requires the alignment of atomic stores to be at least the size of the type.
679 llvm::LLVMSetAlignment(store, size.bytes() as c_uint);
683 fn gep(&mut self, ty: &'ll Type, ptr: &'ll Value, indices: &[&'ll Value]) -> &'ll Value {
690 indices.len() as c_uint,
700 indices: &[&'ll Value],
703 llvm::LLVMBuildInBoundsGEP2(
708 indices.len() as c_uint,
714 fn struct_gep(&mut self, ty: &'ll Type, ptr: &'ll Value, idx: u64) -> &'ll Value {
715 assert_eq!(idx as c_uint as u64, idx);
716 unsafe { llvm::LLVMBuildStructGEP2(self.llbuilder, ty, ptr, idx as c_uint, UNNAMED) }
720 fn trunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
721 unsafe { llvm::LLVMBuildTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
724 fn sext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
725 unsafe { llvm::LLVMBuildSExt(self.llbuilder, val, dest_ty, UNNAMED) }
728 fn fptoui_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
729 self.fptoint_sat(false, val, dest_ty)
732 fn fptosi_sat(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> Option<&'ll Value> {
733 self.fptoint_sat(true, val, dest_ty)
736 fn fptoui(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
737 // On WebAssembly the `fptoui` and `fptosi` instructions currently have
738 // poor codegen. The reason for this is that the corresponding wasm
739 // instructions, `i32.trunc_f32_s` for example, will trap when the float
740 // is out-of-bounds, infinity, or nan. This means that LLVM
741 // automatically inserts control flow around `fptoui` and `fptosi`
742 // because the LLVM instruction `fptoui` is defined as producing a
743 // poison value, not having UB on out-of-bounds values.
745 // This method, however, is only used with non-saturating casts that
746 // have UB on out-of-bounds values. This means that it's ok if we use
747 // the raw wasm instruction since out-of-bounds values can do whatever
748 // we like. To ensure that LLVM picks the right instruction we choose
749 // the raw wasm intrinsic functions which avoid LLVM inserting all the
750 // other control flow automatically.
751 if self.sess().target.is_like_wasm {
752 let src_ty = self.cx.val_ty(val);
753 if self.cx.type_kind(src_ty) != TypeKind::Vector {
754 let float_width = self.cx.float_width(src_ty);
755 let int_width = self.cx.int_width(dest_ty);
756 let name = match (int_width, float_width) {
757 (32, 32) => Some("llvm.wasm.trunc.unsigned.i32.f32"),
758 (32, 64) => Some("llvm.wasm.trunc.unsigned.i32.f64"),
759 (64, 32) => Some("llvm.wasm.trunc.unsigned.i64.f32"),
760 (64, 64) => Some("llvm.wasm.trunc.unsigned.i64.f64"),
763 if let Some(name) = name {
764 return self.call_intrinsic(name, &[val]);
768 unsafe { llvm::LLVMBuildFPToUI(self.llbuilder, val, dest_ty, UNNAMED) }
771 fn fptosi(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
772 // see `fptoui` above for why wasm is different here
773 if self.sess().target.is_like_wasm {
774 let src_ty = self.cx.val_ty(val);
775 if self.cx.type_kind(src_ty) != TypeKind::Vector {
776 let float_width = self.cx.float_width(src_ty);
777 let int_width = self.cx.int_width(dest_ty);
778 let name = match (int_width, float_width) {
779 (32, 32) => Some("llvm.wasm.trunc.signed.i32.f32"),
780 (32, 64) => Some("llvm.wasm.trunc.signed.i32.f64"),
781 (64, 32) => Some("llvm.wasm.trunc.signed.i64.f32"),
782 (64, 64) => Some("llvm.wasm.trunc.signed.i64.f64"),
785 if let Some(name) = name {
786 return self.call_intrinsic(name, &[val]);
790 unsafe { llvm::LLVMBuildFPToSI(self.llbuilder, val, dest_ty, UNNAMED) }
793 fn uitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
794 unsafe { llvm::LLVMBuildUIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
797 fn sitofp(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
798 unsafe { llvm::LLVMBuildSIToFP(self.llbuilder, val, dest_ty, UNNAMED) }
801 fn fptrunc(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
802 unsafe { llvm::LLVMBuildFPTrunc(self.llbuilder, val, dest_ty, UNNAMED) }
805 fn fpext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
806 unsafe { llvm::LLVMBuildFPExt(self.llbuilder, val, dest_ty, UNNAMED) }
809 fn ptrtoint(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
810 unsafe { llvm::LLVMBuildPtrToInt(self.llbuilder, val, dest_ty, UNNAMED) }
813 fn inttoptr(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
814 unsafe { llvm::LLVMBuildIntToPtr(self.llbuilder, val, dest_ty, UNNAMED) }
817 fn bitcast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
818 unsafe { llvm::LLVMBuildBitCast(self.llbuilder, val, dest_ty, UNNAMED) }
821 fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value {
822 unsafe { llvm::LLVMRustBuildIntCast(self.llbuilder, val, dest_ty, is_signed) }
825 fn pointercast(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
826 unsafe { llvm::LLVMBuildPointerCast(self.llbuilder, val, dest_ty, UNNAMED) }
830 fn icmp(&mut self, op: IntPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
831 let op = llvm::IntPredicate::from_generic(op);
832 unsafe { llvm::LLVMBuildICmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
835 fn fcmp(&mut self, op: RealPredicate, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
836 let op = llvm::RealPredicate::from_generic(op);
837 unsafe { llvm::LLVMBuildFCmp(self.llbuilder, op as c_uint, lhs, rhs, UNNAMED) }
840 /* Miscellaneous instructions */
850 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
851 let size = self.intcast(size, self.type_isize(), false);
852 let is_volatile = flags.contains(MemFlags::VOLATILE);
853 let dst = self.pointercast(dst, self.type_i8p());
854 let src = self.pointercast(src, self.type_i8p());
856 llvm::LLVMRustBuildMemCpy(
859 dst_align.bytes() as c_uint,
861 src_align.bytes() as c_uint,
877 assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memmove not supported");
878 let size = self.intcast(size, self.type_isize(), false);
879 let is_volatile = flags.contains(MemFlags::VOLATILE);
880 let dst = self.pointercast(dst, self.type_i8p());
881 let src = self.pointercast(src, self.type_i8p());
883 llvm::LLVMRustBuildMemMove(
886 dst_align.bytes() as c_uint,
888 src_align.bytes() as c_uint,
898 fill_byte: &'ll Value,
903 let is_volatile = flags.contains(MemFlags::VOLATILE);
904 let ptr = self.pointercast(ptr, self.type_i8p());
906 llvm::LLVMRustBuildMemSet(
909 align.bytes() as c_uint,
920 then_val: &'ll Value,
921 else_val: &'ll Value,
923 unsafe { llvm::LLVMBuildSelect(self.llbuilder, cond, then_val, else_val, UNNAMED) }
926 fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
927 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
930 fn extract_element(&mut self, vec: &'ll Value, idx: &'ll Value) -> &'ll Value {
931 unsafe { llvm::LLVMBuildExtractElement(self.llbuilder, vec, idx, UNNAMED) }
934 fn vector_splat(&mut self, num_elts: usize, elt: &'ll Value) -> &'ll Value {
936 let elt_ty = self.cx.val_ty(elt);
937 let undef = llvm::LLVMGetUndef(self.type_vector(elt_ty, num_elts as u64));
938 let vec = self.insert_element(undef, elt, self.cx.const_i32(0));
939 let vec_i32_ty = self.type_vector(self.type_i32(), num_elts as u64);
940 self.shuffle_vector(vec, undef, self.const_null(vec_i32_ty))
944 fn extract_value(&mut self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
945 assert_eq!(idx as c_uint as u64, idx);
946 unsafe { llvm::LLVMBuildExtractValue(self.llbuilder, agg_val, idx as c_uint, UNNAMED) }
949 fn insert_value(&mut self, agg_val: &'ll Value, elt: &'ll Value, idx: u64) -> &'ll Value {
950 assert_eq!(idx as c_uint as u64, idx);
951 unsafe { llvm::LLVMBuildInsertValue(self.llbuilder, agg_val, elt, idx as c_uint, UNNAMED) }
954 fn set_personality_fn(&mut self, personality: &'ll Value) {
956 llvm::LLVMSetPersonalityFn(self.llfn(), personality);
960 fn cleanup_landing_pad(&mut self, ty: &'ll Type, pers_fn: &'ll Value) -> &'ll Value {
961 let landing_pad = self.landing_pad(ty, pers_fn, 1 /* FIXME should this be 0? */);
963 llvm::LLVMSetCleanup(landing_pad, llvm::True);
968 fn resume(&mut self, exn: &'ll Value) {
970 llvm::LLVMBuildResume(self.llbuilder, exn);
974 fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
975 let name = cstr!("cleanuppad");
977 llvm::LLVMRustBuildCleanupPad(
980 args.len() as c_uint,
985 Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
988 fn cleanup_ret(&mut self, funclet: &Funclet<'ll>, unwind: Option<&'ll BasicBlock>) {
990 llvm::LLVMRustBuildCleanupRet(self.llbuilder, funclet.cleanuppad(), unwind)
991 .expect("LLVM does not have support for cleanupret");
995 fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
996 let name = cstr!("catchpad");
998 llvm::LLVMRustBuildCatchPad(
1001 args.len() as c_uint,
1006 Funclet::new(ret.expect("LLVM does not have support for catchpad"))
1011 parent: Option<&'ll Value>,
1012 unwind: Option<&'ll BasicBlock>,
1013 handlers: &[&'ll BasicBlock],
1015 let name = cstr!("catchswitch");
1017 llvm::LLVMRustBuildCatchSwitch(
1021 handlers.len() as c_uint,
1025 let ret = ret.expect("LLVM does not have support for catchswitch");
1026 for handler in handlers {
1028 llvm::LLVMRustAddHandler(ret, handler);
1034 // Atomic Operations
1040 order: rustc_codegen_ssa::common::AtomicOrdering,
1041 failure_order: rustc_codegen_ssa::common::AtomicOrdering,
1044 let weak = if weak { llvm::True } else { llvm::False };
1046 llvm::LLVMRustBuildAtomicCmpXchg(
1051 AtomicOrdering::from_generic(order),
1052 AtomicOrdering::from_generic(failure_order),
1059 op: rustc_codegen_ssa::common::AtomicRmwBinOp,
1062 order: rustc_codegen_ssa::common::AtomicOrdering,
1065 llvm::LLVMBuildAtomicRMW(
1067 AtomicRmwBinOp::from_generic(op),
1070 AtomicOrdering::from_generic(order),
1078 order: rustc_codegen_ssa::common::AtomicOrdering,
1079 scope: rustc_codegen_ssa::common::SynchronizationScope,
1082 llvm::LLVMRustBuildAtomicFence(
1084 AtomicOrdering::from_generic(order),
1085 SynchronizationScope::from_generic(scope),
1090 fn set_invariant_load(&mut self, load: &'ll Value) {
1092 llvm::LLVMSetMetadata(
1094 llvm::MD_invariant_load as c_uint,
1095 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1100 fn lifetime_start(&mut self, ptr: &'ll Value, size: Size) {
1101 self.call_lifetime_intrinsic("llvm.lifetime.start.p0i8", ptr, size);
1104 fn lifetime_end(&mut self, ptr: &'ll Value, size: Size) {
1105 self.call_lifetime_intrinsic("llvm.lifetime.end.p0i8", ptr, size);
1108 fn instrprof_increment(
1110 fn_name: &'ll Value,
1112 num_counters: &'ll Value,
1116 "instrprof_increment() with args ({:?}, {:?}, {:?}, {:?})",
1117 fn_name, hash, num_counters, index
1120 let llfn = unsafe { llvm::LLVMRustGetInstrProfIncrementIntrinsic(self.cx().llmod) };
1121 let llty = self.cx.type_func(
1122 &[self.cx.type_i8p(), self.cx.type_i64(), self.cx.type_i32(), self.cx.type_i32()],
1123 self.cx.type_void(),
1125 let args = &[fn_name, hash, num_counters, index];
1126 let args = self.check_call("call", llty, llfn, args);
1129 let _ = llvm::LLVMRustBuildCall(
1133 args.as_ptr() as *const &llvm::Value,
1134 args.len() as c_uint,
1144 args: &[&'ll Value],
1145 funclet: Option<&Funclet<'ll>>,
1147 debug!("call {:?} with args ({:?})", llfn, args);
1149 let args = self.check_call("call", llty, llfn, args);
1150 let bundle = funclet.map(|funclet| funclet.bundle());
1151 let bundle = bundle.as_ref().map(|b| &*b.raw);
1154 llvm::LLVMRustBuildCall(
1158 args.as_ptr() as *const &llvm::Value,
1159 args.len() as c_uint,
1165 fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value {
1166 unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) }
1169 fn do_not_inline(&mut self, llret: &'ll Value) {
1170 let noinline = llvm::AttributeKind::NoInline.create_attr(self.llcx);
1171 attributes::apply_to_callsite(llret, llvm::AttributePlace::Function, &[noinline]);
1175 impl<'ll> StaticBuilderMethods for Builder<'_, 'll, '_> {
1176 fn get_static(&mut self, def_id: DefId) -> &'ll Value {
1177 // Forward to the `get_static` method of `CodegenCx`
1178 self.cx().get_static(def_id)
1182 impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
1183 fn with_cx(cx: &'a CodegenCx<'ll, 'tcx>) -> Self {
1184 // Create a fresh builder from the crate context.
1185 let llbuilder = unsafe { llvm::LLVMCreateBuilderInContext(cx.llcx) };
1186 Builder { llbuilder, cx }
1189 pub fn llfn(&self) -> &'ll Value {
1190 unsafe { llvm::LLVMGetBasicBlockParent(self.llbb()) }
1193 fn position_at_start(&mut self, llbb: &'ll BasicBlock) {
1195 llvm::LLVMRustPositionBuilderAtStart(self.llbuilder, llbb);
1199 fn align_metadata(&mut self, load: &'ll Value, align: Align) {
1201 let v = [self.cx.const_u64(align.bytes())];
1203 llvm::LLVMSetMetadata(
1205 llvm::MD_align as c_uint,
1206 llvm::LLVMMDNodeInContext(self.cx.llcx, v.as_ptr(), v.len() as c_uint),
1211 fn noundef_metadata(&mut self, load: &'ll Value) {
1213 llvm::LLVMSetMetadata(
1215 llvm::MD_noundef as c_uint,
1216 llvm::LLVMMDNodeInContext(self.cx.llcx, ptr::null(), 0),
1221 pub fn minnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1222 unsafe { llvm::LLVMRustBuildMinNum(self.llbuilder, lhs, rhs) }
1225 pub fn maxnum(&mut self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
1226 unsafe { llvm::LLVMRustBuildMaxNum(self.llbuilder, lhs, rhs) }
1229 pub fn insert_element(
1235 unsafe { llvm::LLVMBuildInsertElement(self.llbuilder, vec, elt, idx, UNNAMED) }
1238 pub fn shuffle_vector(
1244 unsafe { llvm::LLVMBuildShuffleVector(self.llbuilder, v1, v2, mask, UNNAMED) }
1247 pub fn vector_reduce_fadd(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1248 unsafe { llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src) }
1250 pub fn vector_reduce_fmul(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1251 unsafe { llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src) }
1253 pub fn vector_reduce_fadd_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1255 let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
1256 llvm::LLVMRustSetFastMath(instr);
1260 pub fn vector_reduce_fmul_fast(&mut self, acc: &'ll Value, src: &'ll Value) -> &'ll Value {
1262 let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
1263 llvm::LLVMRustSetFastMath(instr);
1267 pub fn vector_reduce_add(&mut self, src: &'ll Value) -> &'ll Value {
1268 unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
1270 pub fn vector_reduce_mul(&mut self, src: &'ll Value) -> &'ll Value {
1271 unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
1273 pub fn vector_reduce_and(&mut self, src: &'ll Value) -> &'ll Value {
1274 unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
1276 pub fn vector_reduce_or(&mut self, src: &'ll Value) -> &'ll Value {
1277 unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
1279 pub fn vector_reduce_xor(&mut self, src: &'ll Value) -> &'ll Value {
1280 unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
1282 pub fn vector_reduce_fmin(&mut self, src: &'ll Value) -> &'ll Value {
1284 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false)
1287 pub fn vector_reduce_fmax(&mut self, src: &'ll Value) -> &'ll Value {
1289 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false)
1292 pub fn vector_reduce_fmin_fast(&mut self, src: &'ll Value) -> &'ll Value {
1295 llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
1296 llvm::LLVMRustSetFastMath(instr);
1300 pub fn vector_reduce_fmax_fast(&mut self, src: &'ll Value) -> &'ll Value {
1303 llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
1304 llvm::LLVMRustSetFastMath(instr);
1308 pub fn vector_reduce_min(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1309 unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
1311 pub fn vector_reduce_max(&mut self, src: &'ll Value, is_signed: bool) -> &'ll Value {
1312 unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
1315 pub fn add_clause(&mut self, landing_pad: &'ll Value, clause: &'ll Value) {
1317 llvm::LLVMAddClause(landing_pad, clause);
1321 pub fn catch_ret(&mut self, funclet: &Funclet<'ll>, unwind: &'ll BasicBlock) -> &'ll Value {
1323 unsafe { llvm::LLVMRustBuildCatchRet(self.llbuilder, funclet.cleanuppad(), unwind) };
1324 ret.expect("LLVM does not have support for catchret")
1327 fn check_store(&mut self, val: &'ll Value, ptr: &'ll Value) -> &'ll Value {
1328 let dest_ptr_ty = self.cx.val_ty(ptr);
1329 let stored_ty = self.cx.val_ty(val);
1330 let stored_ptr_ty = self.cx.type_ptr_to(stored_ty);
1332 assert_eq!(self.cx.type_kind(dest_ptr_ty), TypeKind::Pointer);
1334 if dest_ptr_ty == stored_ptr_ty {
1338 "type mismatch in store. \
1339 Expected {:?}, got {:?}; inserting bitcast",
1340 dest_ptr_ty, stored_ptr_ty
1342 self.bitcast(ptr, stored_ptr_ty)
1351 args: &'b [&'ll Value],
1352 ) -> Cow<'b, [&'ll Value]> {
1354 self.cx.type_kind(fn_ty) == TypeKind::Function,
1355 "builder::{} not passed a function, but {:?}",
1360 let param_tys = self.cx.func_params_types(fn_ty);
1362 let all_args_match = iter::zip(¶m_tys, args.iter().map(|&v| self.val_ty(v)))
1363 .all(|(expected_ty, actual_ty)| *expected_ty == actual_ty);
1366 return Cow::Borrowed(args);
1369 let casted_args: Vec<_> = iter::zip(param_tys, args)
1371 .map(|(i, (expected_ty, &actual_val))| {
1372 let actual_ty = self.val_ty(actual_val);
1373 if expected_ty != actual_ty {
1375 "type mismatch in function call of {:?}. \
1376 Expected {:?} for param {}, got {:?}; injecting bitcast",
1377 llfn, expected_ty, i, actual_ty
1379 self.bitcast(actual_val, expected_ty)
1386 Cow::Owned(casted_args)
1389 pub fn va_arg(&mut self, list: &'ll Value, ty: &'ll Type) -> &'ll Value {
1390 unsafe { llvm::LLVMBuildVAArg(self.llbuilder, list, ty, UNNAMED) }
1393 pub(crate) fn call_intrinsic(&mut self, intrinsic: &str, args: &[&'ll Value]) -> &'ll Value {
1394 let (ty, f) = self.cx.get_intrinsic(intrinsic);
1395 self.call(ty, f, args, None)
1398 fn call_lifetime_intrinsic(&mut self, intrinsic: &str, ptr: &'ll Value, size: Size) {
1399 let size = size.bytes();
1404 if !self.cx().sess().emit_lifetime_markers() {
1408 let ptr = self.pointercast(ptr, self.cx.type_i8p());
1409 self.call_intrinsic(intrinsic, &[self.cx.const_u64(size), ptr]);
1415 vals: &[&'ll Value],
1416 bbs: &[&'ll BasicBlock],
1418 assert_eq!(vals.len(), bbs.len());
1419 let phi = unsafe { llvm::LLVMBuildPhi(self.llbuilder, ty, UNNAMED) };
1421 llvm::LLVMAddIncoming(phi, vals.as_ptr(), bbs.as_ptr(), vals.len() as c_uint);
1426 fn add_incoming_to_phi(&mut self, phi: &'ll Value, val: &'ll Value, bb: &'ll BasicBlock) {
1428 llvm::LLVMAddIncoming(phi, &val, &bb, 1 as c_uint);
1437 ) -> Option<&'ll Value> {
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 {
1440 assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
1442 self.cx.element_type(src_ty),
1443 self.cx.element_type(dest_ty),
1444 Some(self.cx.vector_length(src_ty)),
1447 (src_ty, dest_ty, None)
1449 let float_width = self.cx.float_width(float_ty);
1450 let int_width = self.cx.int_width(int_ty);
1452 let instr = if signed { "fptosi" } else { "fptoui" };
1453 let name = if let Some(vector_length) = vector_length {
1455 "llvm.{}.sat.v{}i{}.v{}f{}",
1456 instr, vector_length, int_width, vector_length, float_width
1459 format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
1461 let f = self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
1462 Some(self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None))
1465 pub(crate) fn landing_pad(
1468 pers_fn: &'ll Value,
1471 // Use LLVMSetPersonalityFn to set the personality. It supports arbitrary Consts while,
1472 // LLVMBuildLandingPad requires the argument to be a Function (as of LLVM 12). The
1473 // personality lives on the parent function anyway.
1474 self.set_personality_fn(pers_fn);
1476 llvm::LLVMBuildLandingPad(self.llbuilder, ty, None, num_clauses as c_uint, UNNAMED)