1 files changed, 102 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mir/statement.rs b/compiler/rustc_codegen_ssa/src/mir/statement.rs
new file mode 100644
index 000000000..f452f2988
--- /dev/null
+++ b/compiler/rustc_codegen_ssa/src/mir/statement.rs
@@ -0,0 +1,102 @@
+use rustc_middle::mir;
+
+use super::FunctionCx;
+use super::LocalRef;
+use crate::traits::BuilderMethods;
+use crate::traits::*;
+
+impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
+    #[instrument(level = "debug", skip(self, bx))]
+    pub fn codegen_statement(&mut self, mut bx: Bx, statement: &mir::Statement<'tcx>) -> Bx {
+        self.set_debug_loc(&mut bx, statement.source_info);
+        match statement.kind {
+            mir::StatementKind::Assign(box (ref place, ref rvalue)) => {
+                if let Some(index) = place.as_local() {
+                    match self.locals[index] {
+                        LocalRef::Place(cg_dest) => self.codegen_rvalue(bx, cg_dest, rvalue),
+                        LocalRef::UnsizedPlace(cg_indirect_dest) => {
+                            self.codegen_rvalue_unsized(bx, cg_indirect_dest, rvalue)
+                        }
+                        LocalRef::Operand(None) => {
+                            let (mut bx, operand) = self.codegen_rvalue_operand(bx, rvalue);
+                            self.locals[index] = LocalRef::Operand(Some(operand));
+                            self.debug_introduce_local(&mut bx, index);
+                            bx
+                        }
+                        LocalRef::Operand(Some(op)) => {
+                            if !op.layout.is_zst() {
+                                span_bug!(
+                                    statement.source_info.span,
+                                    "operand {:?} already assigned",
+                                    rvalue
+                                );
+                            }
+
+                            // If the type is zero-sized, it's already been set here,
+                            // but we still need to make sure we codegen the operand
+                            self.codegen_rvalue_operand(bx, rvalue).0
+                        }
+                    }
+                } else {
+                    let cg_dest = self.codegen_place(&mut bx, place.as_ref());
+                    self.codegen_rvalue(bx, cg_dest, rvalue)
+                }
+            }
+            mir::StatementKind::SetDiscriminant { box ref place, variant_index } => {
+                self.codegen_place(&mut bx, place.as_ref())
+                    .codegen_set_discr(&mut bx, variant_index);
+                bx
+            }
+            mir::StatementKind::Deinit(..) => {
+                // For now, don't codegen this to anything. In the future it may be worth
+                // experimenting with what kind of information we can emit to LLVM without hurting
+                // perf here
+                bx
+            }
+            mir::StatementKind::StorageLive(local) => {
+                if let LocalRef::Place(cg_place) = self.locals[local] {
+                    cg_place.storage_live(&mut bx);
+                } else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
+                    cg_indirect_place.storage_live(&mut bx);
+                }
+                bx
+            }
+            mir::StatementKind::StorageDead(local) => {
+                if let LocalRef::Place(cg_place) = self.locals[local] {
+                    cg_place.storage_dead(&mut bx);
+                } else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
+                    cg_indirect_place.storage_dead(&mut bx);
+                }
+                bx
+            }
+            mir::StatementKind::Coverage(box ref coverage) => {
+                self.codegen_coverage(&mut bx, coverage.clone(), statement.source_info.scope);
+                bx
+            }
+            mir::StatementKind::CopyNonOverlapping(box mir::CopyNonOverlapping {
+                ref src,
+                ref dst,
+                ref count,
+            }) => {
+                let dst_val = self.codegen_operand(&mut bx, dst);
+                let src_val = self.codegen_operand(&mut bx, src);
+                let count = self.codegen_operand(&mut bx, count).immediate();
+                let pointee_layout = dst_val
+                    .layout
+                    .pointee_info_at(&bx, rustc_target::abi::Size::ZERO)
+                    .expect("Expected pointer");
+                let bytes = bx.mul(count, bx.const_usize(pointee_layout.size.bytes()));
+
+                let align = pointee_layout.align;
+                let dst = dst_val.immediate();
+                let src = src_val.immediate();
+                bx.memcpy(dst, align, src, align, bytes, crate::MemFlags::empty());
+                bx
+            }
+            mir::StatementKind::FakeRead(..)
+            | mir::StatementKind::Retag { .. }
+            | mir::StatementKind::AscribeUserType(..)
+            | mir::StatementKind::Nop => bx,
+        }
+    }
+}