auto merge of #7410 : luqmana/rust/bare-self, r=catamorphism

Finally sorted this out. Fixes #5321, #4439, and #4850.

src/librustc/middle/trans/asm.rs

@@ -41,6 +41,7 @@ pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block {
             callee::trans_arg_expr(bcx,
                                    expr_ty(bcx, out),
                                    ty::ByCopy,
+                                   ast::sty_static,
                                    out,
                                    &mut cleanups,
                                    None,
@@ -56,6 +57,7 @@ pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block {
             callee::trans_arg_expr(bcx,
                                    expr_ty(bcx, e),
                                    ty::ByCopy,
+                                   ast::sty_static,
                                    e,
                                    &mut cleanups,
                                    None,
@@ -77,6 +79,7 @@ pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block {
             callee::trans_arg_expr(bcx,
                                    expr_ty(bcx, in),
                                    ty::ByCopy,
+                                   ast::sty_static,
                                    in,
                                    &mut cleanups,
                                    None,

src/librustc/middle/trans/base.rs

@@ -1680,23 +1680,15 @@ pub fn copy_args_to_allocas(fcx: fn_ctxt,
     let mut bcx = bcx;
 
     match fcx.llself {
-      Some(slf) => {
-          let self_val = if slf.is_owned
-                  && datum::appropriate_mode(slf.t).is_by_value() {
-              let tmp = BitCast(bcx, slf.v, type_of(bcx.ccx(), slf.t));
-              let alloc = alloc_ty(bcx, slf.t);
-              Store(bcx, tmp, alloc);
-              alloc
-          } else {
-              PointerCast(bcx, slf.v, type_of(bcx.ccx(), slf.t).ptr_to())
-          };
-
-          fcx.llself = Some(ValSelfData {v: self_val, ..slf});
-          if slf.is_owned {
-              add_clean(bcx, self_val, slf.t);
-          }
-      }
-      _ => {}
+        Some(slf) => {
+            let self_val = PointerCast(bcx, slf.v, type_of(bcx.ccx(), slf.t).ptr_to());
+            fcx.llself = Some(ValSelfData {v: self_val, ..slf});
+
+            if slf.is_owned {
+                add_clean(bcx, slf.v, slf.t);
+            }
+        }
+        _ => {}
     }
 
     for uint::range(0, arg_tys.len()) |arg_n| {

src/librustc/middle/trans/callee.rs

@@ -63,6 +63,7 @@ pub struct MethodData {
     llself: ValueRef,
     self_ty: ty::t,
     self_mode: ty::SelfMode,
+    explicit_self: ast::explicit_self_
 }
 
 pub enum CalleeData {
@@ -565,7 +566,8 @@ pub fn trans_call_inner(in_cx: block,
         // Now that the arguments have finished evaluating, we need to revoke
         // the cleanup for the self argument, if it exists
         match callee.data {
-            Method(d) if d.self_mode == ty::ByCopy => {
+            Method(d) if d.self_mode == ty::ByCopy ||
+                         d.explicit_self == ast::sty_value => {
                 revoke_clean(bcx, d.llself);
             }
             _ => {}
@@ -687,6 +689,7 @@ pub fn trans_args(cx: block,
                 trans_arg_expr(bcx,
                                arg_tys[i],
                                ty::ByCopy,
+                               ast::sty_static,
                                *arg_expr,
                                &mut temp_cleanups,
                                if i == last { ret_flag } else { None },
@@ -720,16 +723,18 @@ pub enum AutorefArg {
 pub fn trans_arg_expr(bcx: block,
                       formal_arg_ty: ty::t,
                       self_mode: ty::SelfMode,
+                      ex_self: ast::explicit_self_,
                       arg_expr: @ast::expr,
                       temp_cleanups: &mut ~[ValueRef],
                       ret_flag: Option<ValueRef>,
                       autoref_arg: AutorefArg) -> Result {
     let _icx = push_ctxt("trans_arg_expr");
     let ccx = bcx.ccx();
 
-    debug!("trans_arg_expr(formal_arg_ty=(%s), self_mode=%?, arg_expr=%s, \
+    debug!("trans_arg_expr(formal_arg_ty=(%s), explicit_self=%? self_mode=%?, arg_expr=%s, \
             ret_flag=%?)",
            formal_arg_ty.repr(bcx.tcx()),
+           ex_self,
            self_mode,
            arg_expr.repr(bcx.tcx()),
            ret_flag.map(|v| bcx.val_to_str(*v)));
@@ -789,8 +794,26 @@ pub fn trans_arg_expr(bcx: block,
                 val = arg_datum.to_ref_llval(bcx);
             }
             DontAutorefArg => {
-                match self_mode {
-                    ty::ByRef => {
+                match (self_mode, ex_self) {
+                    (ty::ByRef, ast::sty_value) => {
+                        debug!("by value self with type %s, storing to scratch",
+                               bcx.ty_to_str(arg_datum.ty));
+                        let scratch = scratch_datum(bcx, arg_datum.ty, false);
+
+                        arg_datum.store_to_datum(bcx,
+                                                 arg_expr.id,
+                                                 INIT,
+                                                 scratch);
+
+                        // Technically, ownership of val passes to the callee.
+                        // However, we must cleanup should we fail before the
+                        // callee is actually invoked.
+                        scratch.add_clean(bcx);
+                        temp_cleanups.push(scratch.val);
+
+                        val = scratch.to_ref_llval(bcx);
+                    }
+                    (ty::ByRef, _) => {
                         // This assertion should really be valid, but because
                         // the explicit self code currently passes by-ref, it
                         // does not hold.
@@ -801,7 +824,7 @@ pub fn trans_arg_expr(bcx: block,
                                bcx.ty_to_str(arg_datum.ty));
                         val = arg_datum.to_ref_llval(bcx);
                     }
-                    ty::ByCopy => {
+                    (ty::ByCopy, _) => {
                         if ty::type_needs_drop(bcx.tcx(), arg_datum.ty) ||
                                 arg_datum.appropriate_mode().is_by_ref() {
                             debug!("by copy arg with type %s, storing to scratch",

src/librustc/middle/trans/meth.rs

@@ -110,9 +110,7 @@ pub fn trans_method(ccx: @mut CrateContext,
         debug!("calling trans_fn with self_ty %s",
                self_ty.repr(ccx.tcx));
         match method.explicit_self.node {
-          ast::sty_value => {
-            impl_owned_self(self_ty)
-          }
+          ast::sty_value => impl_owned_self(self_ty),
           _ => {
             impl_self(self_ty)
           }
@@ -145,6 +143,7 @@ pub fn trans_self_arg(bcx: block,
     let result = trans_arg_expr(bcx,
                                 self_ty,
                                 mentry.self_mode,
+                                mentry.explicit_self,
                                 base,
                                 &mut temp_cleanups,
                                 None,
@@ -231,6 +230,7 @@ pub fn trans_method_callee(bcx: block,
                     llself: val,
                     self_ty: node_id_type(bcx, this.id),
                     self_mode: mentry.self_mode,
+                    explicit_self: mentry.explicit_self
                 })
             }
         }
@@ -453,6 +453,7 @@ pub fn trans_monomorphized_callee(bcx: block,
                   llself: llself_val,
                   self_ty: node_id_type(bcx, base.id),
                   self_mode: mentry.self_mode,
+                  explicit_self: mentry.explicit_self
               })
           }
       }
@@ -692,6 +693,7 @@ pub fn trans_trait_callee_from_llval(bcx: block,
             llself: llself,
             self_ty: ty::mk_opaque_box(bcx.tcx()),
             self_mode: self_mode,
+            explicit_self: explicit_self
             /* XXX: Some(llbox) */
         })
     };

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

@@ -976,7 +976,9 @@ 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);
+        // FIXME(#7411): 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
@@ -1242,10 +1244,3 @@ 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,
-    }
-}

src/test/run-pass/issue-5321-immediates-with-bare-self.rs

@@ -0,0 +1,25 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+trait Fooable {
+    fn yes(self);
+}
+
+impl Fooable for uint {
+    fn yes(self) {
+        for self.times {
+            println("yes");
+        }
+    }
+}
+
+fn main() {
+    2.yes();
+}