1 files changed, 147 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mono_item.rs b/compiler/rustc_codegen_ssa/src/mono_item.rs
new file mode 100644
index 000000000..5006a2157
--- /dev/null
+++ b/compiler/rustc_codegen_ssa/src/mono_item.rs
@@ -0,0 +1,147 @@
+use crate::base;
+use crate::common;
+use crate::traits::*;
+use rustc_hir as hir;
+use rustc_middle::mir::mono::MonoItem;
+use rustc_middle::mir::mono::{Linkage, Visibility};
+use rustc_middle::ty;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
+use rustc_middle::ty::Instance;
+
+pub trait MonoItemExt<'a, 'tcx> {
+    fn define<Bx: BuilderMethods<'a, 'tcx>>(&self, cx: &'a Bx::CodegenCx);
+    fn predefine<Bx: BuilderMethods<'a, 'tcx>>(
+        &self,
+        cx: &'a Bx::CodegenCx,
+        linkage: Linkage,
+        visibility: Visibility,
+    );
+    fn to_raw_string(&self) -> String;
+}
+
+impl<'a, 'tcx: 'a> MonoItemExt<'a, 'tcx> for MonoItem<'tcx> {
+    fn define<Bx: BuilderMethods<'a, 'tcx>>(&self, cx: &'a Bx::CodegenCx) {
+        debug!(
+            "BEGIN IMPLEMENTING '{} ({})' in cgu {}",
+            self,
+            self.to_raw_string(),
+            cx.codegen_unit().name()
+        );
+
+        match *self {
+            MonoItem::Static(def_id) => {
+                cx.codegen_static(def_id, cx.tcx().is_mutable_static(def_id));
+            }
+            MonoItem::GlobalAsm(item_id) => {
+                let item = cx.tcx().hir().item(item_id);
+                if let hir::ItemKind::GlobalAsm(ref asm) = item.kind {
+                    let operands: Vec<_> = asm
+                        .operands
+                        .iter()
+                        .map(|(op, op_sp)| match *op {
+                            hir::InlineAsmOperand::Const { ref anon_const } => {
+                                let anon_const_def_id =
+                                    cx.tcx().hir().local_def_id(anon_const.hir_id).to_def_id();
+                                let const_value =
+                                    cx.tcx().const_eval_poly(anon_const_def_id).unwrap_or_else(
+                                        |_| span_bug!(*op_sp, "asm const cannot be resolved"),
+                                    );
+                                let ty = cx
+                                    .tcx()
+                                    .typeck_body(anon_const.body)
+                                    .node_type(anon_const.hir_id);
+                                let string = common::asm_const_to_str(
+                                    cx.tcx(),
+                                    *op_sp,
+                                    const_value,
+                                    cx.layout_of(ty),
+                                );
+                                GlobalAsmOperandRef::Const { string }
+                            }
+                            hir::InlineAsmOperand::SymFn { ref anon_const } => {
+                                let ty = cx
+                                    .tcx()
+                                    .typeck_body(anon_const.body)
+                                    .node_type(anon_const.hir_id);
+                                let instance = match ty.kind() {
+                                    &ty::FnDef(def_id, substs) => Instance::new(def_id, substs),
+                                    _ => span_bug!(*op_sp, "asm sym is not a function"),
+                                };
+
+                                GlobalAsmOperandRef::SymFn { instance }
+                            }
+                            hir::InlineAsmOperand::SymStatic { path: _, def_id } => {
+                                GlobalAsmOperandRef::SymStatic { def_id }
+                            }
+                            hir::InlineAsmOperand::In { .. }
+                            | hir::InlineAsmOperand::Out { .. }
+                            | hir::InlineAsmOperand::InOut { .. }
+                            | hir::InlineAsmOperand::SplitInOut { .. } => {
+                                span_bug!(*op_sp, "invalid operand type for global_asm!")
+                            }
+                        })
+                        .collect();
+
+                    cx.codegen_global_asm(asm.template, &operands, asm.options, asm.line_spans);
+                } else {
+                    span_bug!(item.span, "Mismatch between hir::Item type and MonoItem type")
+                }
+            }
+            MonoItem::Fn(instance) => {
+                base::codegen_instance::<Bx>(&cx, instance);
+            }
+        }
+
+        debug!(
+            "END IMPLEMENTING '{} ({})' in cgu {}",
+            self,
+            self.to_raw_string(),
+            cx.codegen_unit().name()
+        );
+    }
+
+    fn predefine<Bx: BuilderMethods<'a, 'tcx>>(
+        &self,
+        cx: &'a Bx::CodegenCx,
+        linkage: Linkage,
+        visibility: Visibility,
+    ) {
+        debug!(
+            "BEGIN PREDEFINING '{} ({})' in cgu {}",
+            self,
+            self.to_raw_string(),
+            cx.codegen_unit().name()
+        );
+
+        let symbol_name = self.symbol_name(cx.tcx()).name;
+
+        debug!("symbol {}", &symbol_name);
+
+        match *self {
+            MonoItem::Static(def_id) => {
+                cx.predefine_static(def_id, linkage, visibility, &symbol_name);
+            }
+            MonoItem::Fn(instance) => {
+                cx.predefine_fn(instance, linkage, visibility, &symbol_name);
+            }
+            MonoItem::GlobalAsm(..) => {}
+        }
+
+        debug!(
+            "END PREDEFINING '{} ({})' in cgu {}",
+            self,
+            self.to_raw_string(),
+            cx.codegen_unit().name()
+        );
+    }
+
+    fn to_raw_string(&self) -> String {
+        match *self {
+            MonoItem::Fn(instance) => {
+                format!("Fn({:?}, {})", instance.def, instance.substs.as_ptr().addr())
+            }
+            MonoItem::Static(id) => format!("Static({:?})", id),
+            MonoItem::GlobalAsm(id) => format!("GlobalAsm({:?})", id),
+        }
+    }
+}