Purge placement new; Make borrowck know about unary move.

cc #3071

Author: nikomatsakis

src/libcore/pipes.rs

@@ -887,7 +887,7 @@ struct port_set<T: send> : recv<T> {
         while result == none && ports.len() > 0 {
             let i = wait_many(ports.map(|p| p.header()));
             alt move ports[i].try_recv() {
-                some(m) {
+                some(copy m) {
                     result = some(move m);
                 }
                 none {
@@ -907,7 +907,7 @@ struct port_set<T: send> : recv<T> {
 
     fn recv() -> T {
         match move self.try_recv() {
-            some(x) { move x }
+            some(copy x) { move x }
             none { fail ~"port_set: endpoints closed" }
         }
     }

src/libstd/arena.rs

@@ -4,6 +4,7 @@ export arena, arena_with_size;
 
 import list;
 import list::{list, cons, nil};
+import unsafe::reinterpret_cast;
 
 type chunk = {data: ~[u8], mut fill: uint};
 
@@ -27,7 +28,12 @@ fn arena() -> arena {
     arena_with_size(32u)
 }
 
-impl arena for arena {
+#[abi = "rust-intrinsic"]
+extern mod rusti {
+    fn move_val_init<T>(&dst: T, -src: T);
+}
+
+impl &arena {
     fn alloc_grow(n_bytes: uint, align: uint) -> *() {
         // Allocate a new chunk.
         let mut head = list::head(self.chunks);
@@ -59,10 +65,13 @@ impl arena for arena {
     }
 
     #[inline(always)]
-    fn alloc(tydesc: *()) -> *() {
+    fn alloc<T>(op: fn() -> T) -> &self/T {
         unsafe {
-            let tydesc = tydesc as *sys::type_desc;
-            self.alloc_inner((*tydesc).size, (*tydesc).align)
+            let tydesc = sys::get_type_desc::<T>();
+            let ptr = self.alloc_inner((*tydesc).size, (*tydesc).align);
+            let ptr: *mut T = reinterpret_cast(ptr);
+            rusti::move_val_init(*ptr, op());
+            return reinterpret_cast(ptr);
         }
     }
 }

src/libsyntax/ast.rs

@@ -81,7 +81,7 @@ enum def {
     def_ty(def_id),
     def_prim_ty(prim_ty),
     def_ty_param(def_id, uint),
-    def_binding(node_id),
+    def_binding(node_id, binding_mode),
     def_use(def_id),
     def_upvar(node_id /* local id of closed over var */,
               @def    /* closed over def */,
@@ -342,10 +342,6 @@ enum expr_ {
     expr_ret(option<@expr>),
     expr_log(int, @expr, @expr),
 
-    expr_new(/* arena */ @expr,
-             /* id for the alloc() call */ node_id,
-             /* value */ @expr),
-
     /* just an assert */
     expr_assert(@expr),
 

src/libsyntax/ast_util.rs

@@ -55,7 +55,7 @@ pure fn def_id_of_def(d: def) -> def_id {
       def_variant(_, id) | def_ty(id) | def_ty_param(id, _) |
       def_use(id) | def_class(id, _) { id }
       def_arg(id, _) | def_local(id, _) | def_self(id) |
-      def_upvar(id, _, _) | def_binding(id) | def_region(id)
+      def_upvar(id, _, _) | def_binding(id, _) | def_region(id)
       | def_typaram_binder(id) {
         local_def(id)
       }

src/libsyntax/fold.rs

@@ -395,11 +395,6 @@ fn noop_fold_expr(e: expr_, fld: ast_fold) -> expr_ {
     let fold_mac = |x| fold_mac_(x, fld);
 
     return alt e {
-          expr_new(p, i, v) {
-            expr_new(fld.fold_expr(p),
-                     fld.new_id(i),
-                     fld.fold_expr(v))
-          }
           expr_vstore(e, v) {
             expr_vstore(fld.fold_expr(e), v)
           }

src/libsyntax/parse/parser.rs

@@ -27,7 +27,7 @@ import ast::{_mod, add, alt_check, alt_exhaustive, arg, arm, attribute,
              expr_call, expr_cast, expr_copy, expr_do_body,
              expr_fail, expr_field, expr_fn, expr_fn_block, expr_if,
              expr_index, expr_lit, expr_log, expr_loop,
-             expr_loop_body, expr_mac, expr_move, expr_new, expr_path,
+             expr_loop_body, expr_mac, expr_move, expr_path,
              expr_rec, expr_ret, expr_swap, expr_struct, expr_tup, expr_unary,
              expr_unary_move, expr_vec, expr_vstore, expr_while, extern_fn,
              field, fn_decl, foreign_item, foreign_item_fn, foreign_mod,
@@ -783,13 +783,6 @@ class parser {
             }
         } else if token::is_bar(self.token) {
             return pexpr(self.parse_lambda_expr());
-        } else if self.eat_keyword(~"new") {
-            self.expect(token::LPAREN);
-            let r = self.parse_expr();
-            self.expect(token::RPAREN);
-            let v = self.parse_expr();
-            return self.mk_pexpr(lo, self.span.hi,
-                              expr_new(r, self.get_id(), v));
         } else if self.eat_keyword(~"if") {
             return pexpr(self.parse_if_expr());
         } else if self.eat_keyword(~"for") {

src/libsyntax/print/pprust.rs

@@ -1190,13 +1190,6 @@ fn print_expr(s: ps, &&expr: @ast::expr) {
         word_nbsp(s, ~"assert");
         print_expr(s, expr);
       }
-      ast::expr_new(p, _, v) {
-        word_nbsp(s, ~"new");
-        popen(s);
-        print_expr(s, p);
-        pclose(s);
-        print_expr(s, v);
-      }
       ast::expr_mac(m) { print_mac(s, m); }
     }
     s.ann.post(ann_node);

src/libsyntax/visit.rs

@@ -361,10 +361,6 @@ fn visit_mac<E>(m: mac, e: E, v: vt<E>) {
 
 fn visit_expr<E>(ex: @expr, e: E, v: vt<E>) {
     alt ex.node {
-      expr_new(pool, _, val) {
-        v.visit_expr(pool, e, v);
-        v.visit_expr(val, e, v);
-      }
       expr_vstore(x, _) { v.visit_expr(x, e, v); }
       expr_vec(es, _) { visit_exprs(es, e, v); }
       expr_rec(flds, base) {

src/rustc/middle/astencode.rs

@@ -366,7 +366,7 @@ impl of tr for ast::def {
           ast::def_ty(did) { ast::def_ty(did.tr(xcx)) }
           ast::def_prim_ty(p) { ast::def_prim_ty(p) }
           ast::def_ty_param(did, v) { ast::def_ty_param(did.tr(xcx), v) }
-          ast::def_binding(nid) { ast::def_binding(xcx.tr_id(nid)) }
+          ast::def_binding(nid, bm) { ast::def_binding(xcx.tr_id(nid), bm) }
           ast::def_use(did) { ast::def_use(did.tr(xcx)) }
           ast::def_upvar(nid1, def, nid2) {
             ast::def_upvar(xcx.tr_id(nid1), @(*def).tr(xcx), xcx.tr_id(nid2))

src/rustc/middle/borrowck/categorization.rs

@@ -178,7 +178,7 @@ impl public_methods for borrowck_ctxt {
           ast::expr_copy(*) | ast::expr_cast(*) | ast::expr_fail(*) |
           ast::expr_vstore(*) | ast::expr_vec(*) | ast::expr_tup(*) |
           ast::expr_if(*) | ast::expr_log(*) |
-          ast::expr_new(*) | ast::expr_binary(*) | ast::expr_while(*) |
+          ast::expr_binary(*) | ast::expr_while(*) |
           ast::expr_block(*) | ast::expr_loop(*) | ast::expr_alt(*) |
           ast::expr_lit(*) | ast::expr_break | ast::expr_mac(*) |
           ast::expr_again | ast::expr_rec(*) | ast::expr_struct(*) |
@@ -266,7 +266,14 @@ impl public_methods for borrowck_ctxt {
               mutbl:m, ty:expr_ty}
           }
 
-          ast::def_binding(pid) {
+          ast::def_binding(vid, ast::bind_by_value) {
+            // by-value bindings are basically local variables
+            @{id:id, span:span,
+              cat:cat_local(vid), lp:some(@lp_local(vid)),
+              mutbl:m_imm, ty:expr_ty}
+          }
+
+          ast::def_binding(pid, ast::bind_by_ref) {
             // bindings are "special" since they are implicit pointers.
 
             // lookup the mutability for this binding that we found in

src/rustc/middle/borrowck/check_loans.rs

@@ -579,6 +579,9 @@ fn check_loans_in_expr(expr: @ast::expr,
         self.check_assignment(at_straight_up, dest);
         self.check_move_out(src);
       }
+      ast::expr_unary_move(src) {
+        self.check_move_out(src);
+      }
       ast::expr_assign(dest, _) |
       ast::expr_assign_op(_, dest, _) {
         self.check_assignment(at_straight_up, dest);

src/rustc/middle/liveness.rs

@@ -465,7 +465,7 @@ fn visit_expr(expr: @expr, &&self: @ir_maps, vt: vt<@ir_maps>) {
       // otherwise, live nodes are not required:
       expr_index(*) | expr_field(*) | expr_vstore(*) |
       expr_vec(*) | expr_rec(*) | expr_call(*) | expr_tup(*) |
-      expr_new(*) | expr_log(*) | expr_binary(*) |
+      expr_log(*) | expr_binary(*) |
       expr_assert(*) | expr_addr_of(*) | expr_copy(*) |
       expr_loop_body(*) | expr_do_body(*) | expr_cast(*) |
       expr_unary(*) | expr_fail(*) |
@@ -1094,7 +1094,6 @@ class liveness {
             self.propagate_through_expr(l, ln)
           }
 
-          expr_new(l, _, r) |
           expr_log(_, l, r) |
           expr_index(l, r) |
           expr_binary(_, l, r) {
@@ -1463,7 +1462,7 @@ fn check_expr(expr: @expr, &&self: @liveness, vt: vt<@liveness>) {
       expr_while(*) | expr_loop(*) |
       expr_index(*) | expr_field(*) | expr_vstore(*) |
       expr_vec(*) | expr_rec(*) | expr_tup(*) |
-      expr_new(*) | expr_log(*) | expr_binary(*) |
+      expr_log(*) | expr_binary(*) |
       expr_assert(*) | expr_copy(*) |
       expr_loop_body(*) | expr_do_body(*) |
       expr_cast(*) | expr_unary(*) | expr_fail(*) |

src/rustc/middle/resolve3.rs

@@ -15,11 +15,11 @@ import syntax::ast::{def_prim_ty, def_region, def_self, def_ty, def_ty_param,
                      def_typaram_binder};
 import syntax::ast::{def_upvar, def_use, def_variant, expr, expr_assign_op};
 import syntax::ast::{expr_binary, expr_cast, expr_field, expr_fn};
-import syntax::ast::{expr_fn_block, expr_index, expr_new, expr_path};
+import syntax::ast::{expr_fn_block, expr_index, expr_path};
 import syntax::ast::{def_prim_ty, def_region, def_self, def_ty, def_ty_param};
 import syntax::ast::{def_upvar, def_use, def_variant, div, eq, expr};
 import syntax::ast::{expr_assign_op, expr_binary, expr_cast, expr_field};
-import syntax::ast::{expr_fn, expr_fn_block, expr_index, expr_new, expr_path};
+import syntax::ast::{expr_fn, expr_fn_block, expr_index, expr_path};
 import syntax::ast::{expr_struct, expr_unary, fn_decl, foreign_item};
 import syntax::ast::{foreign_item_fn, ge, gt, ident, trait_ref, impure_fn};
 import syntax::ast::{instance_var, item, item_class, item_const, item_enum};
@@ -3734,7 +3734,7 @@ class Resolver {
         let pat_id = pattern.id;
         do walk_pat(pattern) |pattern| {
             alt pattern.node {
-                pat_ident(_, path, _)
+                pat_ident(binding_mode, path, _)
                         if !path.global && path.idents.len() == 1u => {
 
                     // The meaning of pat_ident with no type parameters
@@ -3781,7 +3781,7 @@ class Resolver {
                                     // For pattern arms, we must use
                                     // `def_binding` definitions.
 
-                                    def_binding(pattern.id)
+                                    def_binding(pattern.id, binding_mode)
                                 }
                                 IrrefutableMode {
                                     // But for locals, we use `def_local`.
@@ -4315,10 +4315,6 @@ class Resolver {
                 self.impl_map.insert(expr.id,
                                      self.current_module.impl_scopes);
             }
-            expr_new(container, _, _) {
-                self.impl_map.insert(container.id,
-                                     self.current_module.impl_scopes);
-            }
             _ {
                 // Nothing to do.
             }

src/rustc/middle/trans/base.rs

@@ -2411,7 +2411,7 @@ fn trans_local_var(cx: block, def: ast::def) -> local_var_result {
         assert (cx.fcx.llargs.contains_key(nid));
         return take_local(cx.fcx.llargs, nid);
       }
-      ast::def_local(nid, _) | ast::def_binding(nid) {
+      ast::def_local(nid, _) | ast::def_binding(nid, _) {
         assert (cx.fcx.lllocals.contains_key(nid));
         return take_local(cx.fcx.lllocals, nid);
       }
@@ -3771,43 +3771,6 @@ fn trans_expr(bcx: block, e: @ast::expr, dest: dest) -> block {
             assert dest == ignore;
             return trans_assign_op(bcx, e, op, dst, src);
           }
-          ast::expr_new(pool, alloc_id, val) {
-            // First, call pool->alloc(tydesc) to get back a void*.
-            // Then, cast this memory to the required type and evaluate value
-            // into it.
-            let ccx = bcx.ccx();
-
-            // Allocate space for the ptr that will be returned from
-            // `pool.alloc()`:
-            let ptr_ty = expr_ty(bcx, e);
-            let ptr_ptr_val = alloc_ty(bcx, ptr_ty);
-
-            debug!{"ptr_ty = %s", ppaux::ty_to_str(tcx, ptr_ty)};
-            debug!{"ptr_ptr_val = %s", val_str(ccx.tn, ptr_ptr_val)};
-
-            let void_ty = ty::mk_nil_ptr(tcx);
-            let llvoid_ty = type_of(ccx, void_ty);
-            let voidval = PointerCast(bcx, ptr_ptr_val, T_ptr(llvoid_ty));
-            debug!{"voidval = %s", val_str(ccx.tn, voidval)};
-
-            let static_ti = get_tydesc(ccx, expr_ty(bcx, val));
-            lazily_emit_all_tydesc_glue(ccx, static_ti);
-            let lltydesc = PointerCast(bcx, static_ti.tydesc, llvoid_ty);
-
-            let origin = bcx.ccx().maps.method_map.get(alloc_id);
-            let bcx = trans_call_inner(
-                bcx, e.info(), node_id_type(bcx, alloc_id), void_ty,
-                |bcx| impl::trans_method_callee(bcx, alloc_id,
-                                                 pool, origin),
-                arg_vals(~[lltydesc]),
-                save_in(voidval));
-
-            debug!{"dest = %s", dest_str(ccx, dest)};
-            let ptr_val = Load(bcx, ptr_ptr_val);
-            debug!{"ptr_val = %s", val_str(ccx.tn, ptr_val)};
-            let bcx = trans_expr(bcx, val, save_in(ptr_val));
-            store_in_dest(bcx, ptr_val, dest)
-          }
           _ {
             bcx.tcx().sess.span_bug(e.span, ~"trans_expr reached \
                                              fall-through case");

src/rustc/middle/trans/type_use.rs

@@ -228,9 +228,6 @@ fn mark_for_expr(cx: ctx, e: @expr) {
       expr_log(_, _, val) {
         node_type_needs(cx, use_tydesc, val.id);
       }
-      expr_new(_, _, v) {
-        node_type_needs(cx, use_repr, v.id);
-      }
       expr_call(f, _, _) {
         vec::iter(ty::ty_fn_args(ty::node_id_to_type(cx.ccx.tcx, f.id)), |a| {
             alt a.mode {

src/rustc/middle/tstate/auxiliary.rs

@@ -525,7 +525,7 @@ fn expr_to_constr_arg(tcx: ty::ctxt, e: @expr) -> @constr_arg_use {
       expr_path(p) {
         alt tcx.def_map.find(e.id) {
           some(def_local(nid, _)) | some(def_arg(nid, _)) |
-          some(def_binding(nid)) | some(def_upvar(nid, _, _)) {
+          some(def_binding(nid, _)) | some(def_upvar(nid, _, _)) {
             return @respan(p.span,
                         carg_ident({ident: p.idents[0], node: nid}));
           }
@@ -762,7 +762,7 @@ fn local_node_id_to_def(fcx: fn_ctxt, i: node_id) -> option<def> {
 fn local_node_id_to_def_id(fcx: fn_ctxt, i: node_id) -> option<def_id> {
     alt local_node_id_to_def(fcx, i) {
       some(def_local(nid, _)) | some(def_arg(nid, _)) |
-      some(def_binding(nid)) | some(def_upvar(nid, _, _)) {
+      some(def_binding(nid, _)) | some(def_upvar(nid, _, _)) {
         some(local_def(nid))
       }
       _ { none }