1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Checks that all rvalues in a crate have statically known size. check_crate
12 // is the public starting point.
14 use rustc::dep_graph::DepNode;
15 use rustc::middle::expr_use_visitor as euv;
16 use rustc::middle::mem_categorization as mc;
17 use rustc::ty::{self, TyCtxt, ParameterEnvironment};
18 use rustc::traits::Reveal;
21 use rustc::hir::intravisit;
25 pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
26 let mut rvcx = RvalueContext { tcx: tcx };
27 tcx.visit_all_items_in_krate(DepNode::RvalueCheck, &mut rvcx);
30 struct RvalueContext<'a, 'tcx: 'a> {
31 tcx: TyCtxt<'a, 'tcx, 'tcx>,
34 impl<'a, 'tcx, 'v> intravisit::Visitor<'v> for RvalueContext<'a, 'tcx> {
35 fn visit_fn(&mut self,
36 fk: intravisit::FnKind<'v>,
41 // FIXME (@jroesch) change this to be an inference context
42 let param_env = ParameterEnvironment::for_item(self.tcx, fn_id);
43 self.tcx.infer_ctxt(None, Some(param_env.clone()),
44 Reveal::NotSpecializable).enter(|infcx| {
45 let mut delegate = RvalueContextDelegate {
49 let mut euv = euv::ExprUseVisitor::new(&mut delegate, &infcx);
52 intravisit::walk_fn(self, fk, fd, b, s, fn_id)
56 struct RvalueContextDelegate<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
57 tcx: TyCtxt<'a, 'gcx, 'tcx>,
58 param_env: &'a ty::ParameterEnvironment<'gcx>,
61 impl<'a, 'gcx, 'tcx> euv::Delegate<'tcx> for RvalueContextDelegate<'a, 'gcx, 'tcx> {
66 _: euv::ConsumeMode) {
67 debug!("consume; cmt: {:?}; type: {:?}", *cmt, cmt.ty);
68 let ty = self.tcx.lift_to_global(&cmt.ty).unwrap();
69 if !ty.is_sized(self.tcx.global_tcx(), self.param_env, span) {
70 span_err!(self.tcx.sess, span, E0161,
71 "cannot move a value of type {0}: the size of {0} cannot be statically determined",
76 fn matched_pat(&mut self,
77 _matched_pat: &hir::Pat,
79 _mode: euv::MatchMode) {}
81 fn consume_pat(&mut self,
82 _consume_pat: &hir::Pat,
84 _mode: euv::ConsumeMode) {
88 _borrow_id: ast::NodeId,
91 _loan_region: &'tcx ty::Region,
93 _loan_cause: euv::LoanCause) {
96 fn decl_without_init(&mut self,
102 _assignment_id: ast::NodeId,
103 _assignment_span: Span,
104 _assignee_cmt: mc::cmt,
105 _mode: euv::MutateMode) {