librustc: Always pass self ByRef.

Author: luqmana

src/librustc/middle/trans/inline.rs

@@ -13,7 +13,7 @@ use core::prelude::*;
 use metadata::csearch;
 use middle::astencode;
 use middle::trans::base::{get_insn_ctxt};
-use middle::trans::base::{impl_owned_self, impl_self, no_self};
+use middle::trans::base::{impl_self, no_self};
 use middle::trans::base::{trans_item, get_item_val, trans_fn};
 use middle::trans::common::*;
 use middle::ty;
@@ -109,7 +109,6 @@ pub fn maybe_instantiate_inline(ccx: @CrateContext, fn_id: ast::def_id,
                       debug!("calling inline trans_fn with self_ty %s",
                              ty_to_str(ccx.tcx, self_ty));
                       match mth.explicit_self.node {
-                          ast::sty_value => impl_owned_self(self_ty),
                           _ => impl_self(self_ty),
                       }
                   }

src/librustc/middle/trans/meth.rs

@@ -130,9 +130,6 @@ pub fn trans_method(ccx: @CrateContext,
                base_self_ty.repr(ccx.tcx),
                self_ty.repr(ccx.tcx));
         match method.explicit_self.node {
-          ast::sty_value => {
-            impl_owned_self(self_ty)
-          }
           _ => {
             impl_self(self_ty)
           }

src/librustc/middle/typeck/check/method.rs

@@ -1035,7 +1035,9 @@ pub impl<'self> LookupContext<'self> {
         let fty = ty::mk_bare_fn(tcx, ty::BareFnTy {sig: fn_sig, ..bare_fn_ty});
         debug!("after replacing bound regions, fty=%s", self.ty_to_str(fty));
 
-        let self_mode = get_mode_from_explicit_self(candidate.method_ty.explicit_self);
+        // XXX: We always pass self by-ref since we stuff it in the environment slot.
+        // Eventually that should not be the case
+        let self_mode = ty::ByRef;
 
         // before we only checked whether self_ty could be a subtype
         // of rcvr_ty; now we actually make it so (this may cause
@@ -1302,10 +1304,3 @@ pub impl<'self> LookupContext<'self> {
         self.tcx().sess.bug(s)
     }
 }
-
-pub fn get_mode_from_explicit_self(explicit_self: ast::explicit_self_) -> SelfMode {
-    match explicit_self {
-        sty_value => ty::ByCopy,
-        _ => ty::ByRef,
-    }
-}