auto merge of #13461 : eddyb/rust/cleanup-at-fn, r=luqmana

Author: bors

src/librustc/front/feature_gate.rs

@@ -260,8 +260,7 @@ impl<'a> Visitor<()> for Context<'a> {
 
     fn visit_ty(&mut self, t: &ast::Ty, _: ()) {
         match t.node {
-            ast::TyClosure(closure) if closure.onceness == ast::Once &&
-                    closure.sigil != ast::OwnedSigil => {
+            ast::TyClosure(closure, _) if closure.onceness == ast::Once => {
                 self.gate_feature("once_fns", t.span,
                                   "once functions are \
                                    experimental and likely to be removed");

src/librustc/metadata/tydecode.rs

@@ -137,15 +137,6 @@ pub fn parse_substs_data(data: &[u8], crate_num: ast::CrateNum, pos: uint, tcx:
     parse_substs(&mut st, conv)
 }
 
-fn parse_sigil(st: &mut PState) -> ast::Sigil {
-    match next(st) {
-        '@' => ast::ManagedSigil,
-        '~' => ast::OwnedSigil,
-        '&' => ast::BorrowedSigil,
-        c => st.tcx.sess.bug(format!("parse_sigil(): bad input '{}'", c))
-    }
-}
-
 fn parse_vstore<M>(st: &mut PState, conv: conv_did,
                    parse_mut: |&mut PState| -> M) -> ty::Vstore<M> {
     assert_eq!(next(st), '/');
@@ -476,17 +467,15 @@ fn parse_onceness(c: char) -> ast::Onceness {
 }
 
 fn parse_closure_ty(st: &mut PState, conv: conv_did) -> ty::ClosureTy {
-    let sigil = parse_sigil(st);
     let fn_style = parse_fn_style(next(st));
     let onceness = parse_onceness(next(st));
-    let region = parse_region(st, |x,y| conv(x,y));
+    let store = parse_trait_store(st, |x,y| conv(x,y));
     let bounds = parse_bounds(st, |x,y| conv(x,y));
     let sig = parse_sig(st, |x,y| conv(x,y));
     ty::ClosureTy {
         fn_style: fn_style,
-        sigil: sigil,
         onceness: onceness,
-        region: region,
+        store: store,
         bounds: bounds.builtin_bounds,
         sig: sig
     }

src/librustc/metadata/tyencode.rs

@@ -327,14 +327,6 @@ fn enc_sty(w: &mut MemWriter, cx: &ctxt, st: &ty::sty) {
     }
 }
 
-fn enc_sigil(w: &mut MemWriter, sigil: Sigil) {
-    match sigil {
-        ManagedSigil => mywrite!(w, "@"),
-        OwnedSigil => mywrite!(w, "~"),
-        BorrowedSigil => mywrite!(w, "&"),
-    }
-}
-
 fn enc_fn_style(w: &mut MemWriter, p: FnStyle) {
     match p {
         NormalFn => mywrite!(w, "n"),
@@ -363,10 +355,9 @@ pub fn enc_bare_fn_ty(w: &mut MemWriter, cx: &ctxt, ft: &ty::BareFnTy) {
 }
 
 fn enc_closure_ty(w: &mut MemWriter, cx: &ctxt, ft: &ty::ClosureTy) {
-    enc_sigil(w, ft.sigil);
     enc_fn_style(w, ft.fn_style);
     enc_onceness(w, ft.onceness);
-    enc_region(w, cx, ft.region);
+    enc_trait_store(w, cx, ft.store);
     let bounds = ty::ParamBounds {builtin_bounds: ft.bounds,
                                   trait_bounds: Vec::new()};
     enc_bounds(w, cx, &bounds);

src/librustc/middle/astencode.rs

@@ -897,10 +897,9 @@ impl<'a> ebml_writer_helpers for Encoder<'a> {
     fn emit_auto_adjustment(&mut self, ecx: &e::EncodeContext, adj: &ty::AutoAdjustment) {
         self.emit_enum("AutoAdjustment", |this| {
             match *adj {
-                ty::AutoAddEnv(region, sigil) => {
-                    this.emit_enum_variant("AutoAddEnv", 0, 2, |this| {
-                        this.emit_enum_variant_arg(0, |this| region.encode(this));
-                        this.emit_enum_variant_arg(1, |this| sigil.encode(this))
+                ty::AutoAddEnv(store) => {
+                    this.emit_enum_variant("AutoAddEnv", 0, 1, |this| {
+                        this.emit_enum_variant_arg(0, |this| store.encode(this))
                     })
                 }
 
@@ -1270,12 +1269,10 @@ impl<'a> ebml_decoder_decoder_helpers for reader::Decoder<'a> {
             this.read_enum_variant(variants, |this, i| {
                 Ok(match i {
                     0 => {
-                        let region: ty::Region =
+                        let store: ty::TraitStore =
                             this.read_enum_variant_arg(0, |this| Decodable::decode(this)).unwrap();
-                        let sigil: ast::Sigil =
-                            this.read_enum_variant_arg(1, |this| Decodable::decode(this)).unwrap();
 
-                        ty:: AutoAddEnv(region.tr(xcx), sigil)
+                        ty:: AutoAddEnv(store.tr(xcx))
                     }
                     1 => {
                         let auto_deref_ref: ty::AutoDerefRef =

src/librustc/middle/borrowck/gather_loans/mod.rs

@@ -451,17 +451,8 @@ impl<'a> GatherLoanCtxt<'a> {
                                              r,
                                              AutoRef)
                     }
-                    ty::AutoBorrowFn(r) => {
-                        let cmt_deref = mc.cat_deref_fn_or_obj(expr, cmt, 0);
-                        self.guarantee_valid(expr.id,
-                                             expr.span,
-                                             cmt_deref,
-                                             ast::MutImmutable,
-                                             r,
-                                             AutoRef)
-                    }
                     ty::AutoBorrowObj(r, m) => {
-                        let cmt_deref = mc.cat_deref_fn_or_obj(expr, cmt, 0);
+                        let cmt_deref = mc.cat_deref_obj(expr, cmt);
                         self.guarantee_valid(expr.id,
                                              expr.span,
                                              cmt_deref,

src/librustc/middle/borrowck/mod.rs

@@ -620,7 +620,7 @@ impl<'a> BorrowckCtxt<'a> {
         fn move_suggestion(tcx: &ty::ctxt, ty: ty::t, default_msg: &'static str)
                           -> &'static str {
             match ty::get(ty).sty {
-                ty::ty_closure(ref cty) if cty.sigil == ast::BorrowedSigil =>
+                ty::ty_closure(~ty::ClosureTy { store: ty::RegionTraitStore(..), .. }) =>
                     "a non-copyable stack closure (capture it in a new closure, \
                      e.g. `|x| f(x)`, to override)",
                 _ if ty::type_moves_by_default(tcx, ty) =>

src/librustc/middle/kind.rs

@@ -197,27 +197,13 @@ fn with_appropriate_checker(cx: &Context,
     let fty = ty::node_id_to_type(cx.tcx, id);
     match ty::get(fty).sty {
         ty::ty_closure(~ty::ClosureTy {
-            sigil: OwnedSigil,
-            bounds: bounds,
-            ..
-        }) => {
-            b(|cx, fv| check_for_uniq(cx, fv, bounds))
-        }
-        ty::ty_closure(~ty::ClosureTy {
-            sigil: ManagedSigil,
-            ..
-        }) => {
-            // can't happen
-            fail!("internal error: saw closure with managed sigil (@fn)");
-        }
+            store: ty::UniqTraitStore, bounds, ..
+        }) => b(|cx, fv| check_for_uniq(cx, fv, bounds)),
+
         ty::ty_closure(~ty::ClosureTy {
-            sigil: BorrowedSigil,
-            bounds: bounds,
-            region: region,
-            ..
-        }) => {
-            b(|cx, fv| check_for_block(cx, fv, bounds, region))
-        }
+            store: ty::RegionTraitStore(region, _), bounds, ..
+        }) => b(|cx, fv| check_for_block(cx, fv, bounds, region)),
+
         ty::ty_bare_fn(_) => {
             b(check_for_bare)
         }

src/librustc/middle/lint.rs

@@ -919,10 +919,8 @@ fn check_heap_type(cx: &Context, span: Span, ty: ty::t) {
                 }
                 ty::ty_uniq(_) | ty::ty_str(ty::VstoreUniq) |
                 ty::ty_vec(_, ty::VstoreUniq) |
-                ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) => {
-                    n_uniq += 1;
-                }
-                ty::ty_closure(ref c) if c.sigil == ast::OwnedSigil => {
+                ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) |
+                ty::ty_closure(~ty::ClosureTy { store: ty::UniqTraitStore, .. }) => {
                     n_uniq += 1;
                 }
 

src/librustc/middle/mem_categorization.rs

@@ -76,7 +76,7 @@ use syntax::parse::token;
 pub enum categorization {
     cat_rvalue(ty::Region),            // temporary val, argument is its scope
     cat_static_item,
-    cat_copied_upvar(CopiedUpvar),     // upvar copied into @fn or ~fn env
+    cat_copied_upvar(CopiedUpvar),     // upvar copied into proc env
     cat_upvar(ty::UpvarId, ty::UpvarBorrow), // by ref upvar from stack closure
     cat_local(ast::NodeId),            // local variable
     cat_arg(ast::NodeId),              // formal argument
@@ -172,7 +172,7 @@ pub fn opt_deref_kind(t: ty::t) -> Option<deref_kind> {
         ty::ty_trait(~ty::TyTrait { store: ty::UniqTraitStore, .. }) |
         ty::ty_vec(_, ty::VstoreUniq) |
         ty::ty_str(ty::VstoreUniq) |
-        ty::ty_closure(~ty::ClosureTy {sigil: ast::OwnedSigil, ..}) => {
+        ty::ty_closure(~ty::ClosureTy {store: ty::UniqTraitStore, ..}) => {
             Some(deref_ptr(OwnedPtr))
         }
 
@@ -187,8 +187,7 @@ pub fn opt_deref_kind(t: ty::t) -> Option<deref_kind> {
         }
 
         ty::ty_str(ty::VstoreSlice(r, ())) |
-        ty::ty_closure(~ty::ClosureTy {sigil: ast::BorrowedSigil,
-                                      region: r, ..}) => {
+        ty::ty_closure(~ty::ClosureTy {store: ty::RegionTraitStore(r, _), ..}) => {
             Some(deref_ptr(BorrowedPtr(ty::ImmBorrow, r)))
         }
 
@@ -540,15 +539,14 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
                       // Decide whether to use implicit reference or by copy/move
                       // capture for the upvar. This, combined with the onceness,
                       // determines whether the closure can move out of it.
-                      let var_is_refd = match (closure_ty.sigil, closure_ty.onceness) {
+                      let var_is_refd = match (closure_ty.store, closure_ty.onceness) {
                           // Many-shot stack closures can never move out.
-                          (ast::BorrowedSigil, ast::Many) => true,
+                          (ty::RegionTraitStore(..), ast::Many) => true,
                           // 1-shot stack closures can move out.
-                          (ast::BorrowedSigil, ast::Once) => false,
+                          (ty::RegionTraitStore(..), ast::Once) => false,
                           // Heap closures always capture by copy/move, and can
                           // move out if they are once.
-                          (ast::OwnedSigil, _) |
-                          (ast::ManagedSigil, _) => false,
+                          (ty::UniqTraitStore, _) => false,
 
                       };
                       if var_is_refd {
@@ -688,19 +686,8 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
         }
     }
 
-    pub fn cat_deref_fn_or_obj<N:ast_node>(&mut self,
-                                           node: &N,
-                                           base_cmt: cmt,
-                                           deref_cnt: uint)
-                                           -> cmt {
-        // Bit of a hack: the "dereference" of a function pointer like
-        // `@fn()` is a mere logical concept. We interpret it as
-        // dereferencing the environment pointer; of course, we don't
-        // know what type lies at the other end, so we just call it
-        // `()` (the empty tuple).
-
-        let opaque_ty = ty::mk_tup(self.tcx(), Vec::new());
-        self.cat_deref_common(node, base_cmt, deref_cnt, opaque_ty)
+    pub fn cat_deref_obj<N:ast_node>(&mut self, node: &N, base_cmt: cmt) -> cmt {
+        self.cat_deref_common(node, base_cmt, 0, ty::mk_nil())
     }
 
     fn cat_deref<N:ast_node>(&mut self,
@@ -1105,7 +1092,7 @@ impl<TYPER:Typer> MemCategorizationContext<TYPER> {
               ~"static item"
           }
           cat_copied_upvar(_) => {
-              ~"captured outer variable in a heap closure"
+              ~"captured outer variable in a proc"
           }
           cat_rvalue(..) => {
               ~"non-lvalue"

src/librustc/middle/moves.rs

@@ -650,30 +650,30 @@ impl<'a> VisitContext<'a> {
         let _indenter = indenter();
 
         let fn_ty = ty::node_id_to_type(self.tcx, fn_expr_id);
-        let sigil = ty::ty_closure_sigil(fn_ty);
         let freevars = freevars::get_freevars(self.tcx, fn_expr_id);
-        let v = if sigil == BorrowedSigil {
-            // || captures everything by ref
-            freevars.iter()
-                    .map(|fvar| CaptureVar {def: fvar.def, span: fvar.span, mode: CapRef})
-                    .collect()
-        } else {
-            // @fn() and ~fn() capture by copy or by move depending on type
-            freevars.iter()
-                    .map(|fvar| {
-                let fvar_def_id = ast_util::def_id_of_def(fvar.def).node;
-                let fvar_ty = ty::node_id_to_type(self.tcx, fvar_def_id);
-                debug!("fvar_def_id={:?} fvar_ty={}",
-                       fvar_def_id, ppaux::ty_to_str(self.tcx, fvar_ty));
-                let mode = if ty::type_moves_by_default(self.tcx, fvar_ty) {
-                    CapMove
-                } else {
-                    CapCopy
-                };
-                CaptureVar {def: fvar.def, span: fvar.span, mode:mode}
-
+        Rc::new(match ty::ty_closure_store(fn_ty) {
+            ty::RegionTraitStore(..) => {
+                // || captures everything by ref
+                freevars.iter()
+                        .map(|fvar| CaptureVar {def: fvar.def, span: fvar.span, mode: CapRef})
+                        .collect()
+            }
+            ty::UniqTraitStore => {
+                // proc captures by copy or by move depending on type
+                freevars.iter()
+                        .map(|fvar| {
+                    let fvar_def_id = ast_util::def_id_of_def(fvar.def).node;
+                    let fvar_ty = ty::node_id_to_type(self.tcx, fvar_def_id);
+                    debug!("fvar_def_id={:?} fvar_ty={}",
+                        fvar_def_id, ppaux::ty_to_str(self.tcx, fvar_ty));
+                    let mode = if ty::type_moves_by_default(self.tcx, fvar_ty) {
+                        CapMove
+                    } else {
+                        CapCopy
+                    };
+                    CaptureVar {def: fvar.def, span: fvar.span, mode:mode}
                 }).collect()
-        };
-        Rc::new(v)
+            }
+        })
     }
 }