5 use crate::traits::BuilderMethods;
8 impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
9 #[instrument(level = "debug", skip(self, bx))]
10 pub fn codegen_statement(&mut self, mut bx: Bx, statement: &mir::Statement<'tcx>) -> Bx {
11 self.set_debug_loc(&mut bx, statement.source_info);
12 match statement.kind {
13 mir::StatementKind::Assign(box (ref place, ref rvalue)) => {
14 if let Some(index) = place.as_local() {
15 match self.locals[index] {
16 LocalRef::Place(cg_dest) => self.codegen_rvalue(bx, cg_dest, rvalue),
17 LocalRef::UnsizedPlace(cg_indirect_dest) => {
18 self.codegen_rvalue_unsized(bx, cg_indirect_dest, rvalue)
20 LocalRef::Operand(None) => {
21 let (mut bx, operand) = self.codegen_rvalue_operand(bx, rvalue);
22 self.locals[index] = LocalRef::Operand(Some(operand));
23 self.debug_introduce_local(&mut bx, index);
26 LocalRef::Operand(Some(op)) => {
27 if !op.layout.is_zst() {
29 statement.source_info.span,
30 "operand {:?} already assigned",
35 // If the type is zero-sized, it's already been set here,
36 // but we still need to make sure we codegen the operand
37 self.codegen_rvalue_operand(bx, rvalue).0
41 let cg_dest = self.codegen_place(&mut bx, place.as_ref());
42 self.codegen_rvalue(bx, cg_dest, rvalue)
45 mir::StatementKind::SetDiscriminant { box ref place, variant_index } => {
46 self.codegen_place(&mut bx, place.as_ref())
47 .codegen_set_discr(&mut bx, variant_index);
50 mir::StatementKind::Deinit(..) => {
51 // For now, don't codegen this to anything. In the future it may be worth
52 // experimenting with what kind of information we can emit to LLVM without hurting
56 mir::StatementKind::StorageLive(local) => {
57 if let LocalRef::Place(cg_place) = self.locals[local] {
58 cg_place.storage_live(&mut bx);
59 } else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
60 cg_indirect_place.storage_live(&mut bx);
64 mir::StatementKind::StorageDead(local) => {
65 if let LocalRef::Place(cg_place) = self.locals[local] {
66 cg_place.storage_dead(&mut bx);
67 } else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
68 cg_indirect_place.storage_dead(&mut bx);
72 mir::StatementKind::Coverage(box ref coverage) => {
73 self.codegen_coverage(&mut bx, coverage.clone(), statement.source_info.scope);
76 mir::StatementKind::CopyNonOverlapping(box mir::CopyNonOverlapping {
81 let dst_val = self.codegen_operand(&mut bx, dst);
82 let src_val = self.codegen_operand(&mut bx, src);
83 let count = self.codegen_operand(&mut bx, count).immediate();
84 let pointee_layout = dst_val
86 .pointee_info_at(&bx, rustc_target::abi::Size::ZERO)
87 .expect("Expected pointer");
88 let bytes = bx.mul(count, bx.const_usize(pointee_layout.size.bytes()));
90 let align = pointee_layout.align;
91 let dst = dst_val.immediate();
92 let src = src_val.immediate();
93 bx.memcpy(dst, align, src, align, bytes, crate::MemFlags::empty());
96 mir::StatementKind::FakeRead(..)
97 | mir::StatementKind::Retag { .. }
98 | mir::StatementKind::AscribeUserType(..)
99 | mir::StatementKind::Nop => bx,