Add codegen for global_asm! sym operands

compiler/rustc_codegen_ssa/src/mono_item.rs

@@ -4,7 +4,9 @@ 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);
@@ -56,7 +58,27 @@ impl<'a, 'tcx: 'a> MonoItemExt<'a, 'tcx> for MonoItem<'tcx> {
                                 );
                                 GlobalAsmOperandRef::Const { string }
                             }
-                            _ => span_bug!(*op_sp, "invalid operand type for global_asm!"),
+                            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();
 

compiler/rustc_codegen_ssa/src/traits/asm.rs

@@ -36,8 +36,10 @@ pub enum InlineAsmOperandRef<'tcx, B: BackendTypes + ?Sized> {
 }
 
 #[derive(Debug)]
-pub enum GlobalAsmOperandRef {
+pub enum GlobalAsmOperandRef<'tcx> {
     Const { string: String },
+    SymFn { instance: Instance<'tcx> },
+    SymStatic { def_id: DefId },
 }
 
 pub trait AsmBuilderMethods<'tcx>: BackendTypes {
@@ -53,11 +55,11 @@ pub trait AsmBuilderMethods<'tcx>: BackendTypes {
     );
 }
 
-pub trait AsmMethods {
+pub trait AsmMethods<'tcx> {
     fn codegen_global_asm(
         &self,
         template: &[InlineAsmTemplatePiece],
-        operands: &[GlobalAsmOperandRef],
+        operands: &[GlobalAsmOperandRef<'tcx>],
         options: InlineAsmOptions,
         line_spans: &[Span],
     );

compiler/rustc_codegen_ssa/src/traits/mod.rs

@@ -60,7 +60,7 @@ pub trait CodegenMethods<'tcx>:
     + StaticMethods
     + CoverageInfoMethods<'tcx>
     + DebugInfoMethods<'tcx>
-    + AsmMethods
+    + AsmMethods<'tcx>
     + PreDefineMethods<'tcx>
     + HasParamEnv<'tcx>
     + HasTyCtxt<'tcx>
@@ -76,7 +76,7 @@ impl<'tcx, T> CodegenMethods<'tcx> for T where
         + StaticMethods
         + CoverageInfoMethods<'tcx>
         + DebugInfoMethods<'tcx>
-        + AsmMethods
+        + AsmMethods<'tcx>
         + PreDefineMethods<'tcx>
         + HasParamEnv<'tcx>
         + HasTyCtxt<'tcx>