Add emit_unwind_info method to TargetIsa

cranelift/codegen/src/context.rs

@@ -241,10 +241,9 @@ impl Context {
         &self,
         isa: &dyn TargetIsa,
     ) -> CodegenResult<Option<crate::isa::unwind::UnwindInfo>> {
-        let backend = isa.get_mach_backend();
         let unwind_info_kind = isa.unwind_info_kind();
         let result = self.mach_compile_result.as_ref().unwrap();
-        backend.emit_unwind_info(result, unwind_info_kind)
+        isa.emit_unwind_info(result, unwind_info_kind)
     }
 
     /// Run the verifier on the function.

cranelift/codegen/src/isa/mod.rs

@@ -244,6 +244,16 @@ pub trait TargetIsa: fmt::Display + Send + Sync {
     /// IntCC condition for Unsigned Addition Overflow (Carry).
     fn unsigned_add_overflow_condition(&self) -> ir::condcodes::IntCC;
 
+    /// Creates unwind information for the function.
+    ///
+    /// Returns `None` if there is no unwind information for the function.
+    #[cfg(feature = "unwind")]
+    fn emit_unwind_info(
+        &self,
+        result: &MachCompileResult,
+        kind: UnwindInfoKind,
+    ) -> CodegenResult<Option<crate::isa::unwind::UnwindInfo>>;
+
     /// Creates a new System V Common Information Entry for the ISA.
     ///
     /// Returns `None` if the ISA does not support System V unwind information.

cranelift/codegen/src/machinst/adapter.rs

@@ -68,6 +68,15 @@ impl TargetIsa for TargetIsaAdapter {
         self.backend.unsigned_add_overflow_condition()
     }
 
+    #[cfg(feature = "unwind")]
+    fn emit_unwind_info(
+        &self,
+        result: &MachCompileResult,
+        kind: UnwindInfoKind,
+    ) -> CodegenResult<Option<crate::isa::unwind::UnwindInfo>> {
+        self.backend.emit_unwind_info(result, kind)
+    }
+
     #[cfg(feature = "unwind")]
     fn create_systemv_cie(&self) -> Option<gimli::write::CommonInformationEntry> {
         self.backend.create_systemv_cie()