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::infer;
17 use rustc::middle::mem_categorization as mc;
18 use rustc::middle::ty::{self, ParameterEnvironment};
21 use rustc_front::intravisit;
23 use syntax::codemap::Span;
25 pub fn check_crate(tcx: &ty::ctxt) {
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: &'a ty::ctxt<'tcx>,
34 impl<'a, 'tcx, 'v> intravisit::Visitor<'v> for RvalueContext<'a, 'tcx> {
35 fn visit_fn(&mut self,
36 fk: intravisit::FnKind<'v>,
42 // FIXME (@jroesch) change this to be an inference context
43 let param_env = ParameterEnvironment::for_item(self.tcx, fn_id);
44 let infcx = infer::new_infer_ctxt(self.tcx,
46 Some(param_env.clone()));
47 let mut delegate = RvalueContextDelegate { tcx: self.tcx, param_env: ¶m_env };
48 let mut euv = euv::ExprUseVisitor::new(&mut delegate, &infcx);
51 intravisit::walk_fn(self, fk, fd, b, s)
55 struct RvalueContextDelegate<'a, 'tcx: 'a> {
56 tcx: &'a ty::ctxt<'tcx>,
57 param_env: &'a ty::ParameterEnvironment<'a,'tcx>,
60 impl<'a, 'tcx> euv::Delegate<'tcx> for RvalueContextDelegate<'a, 'tcx> {
65 _: euv::ConsumeMode) {
66 debug!("consume; cmt: {:?}; type: {:?}", *cmt, cmt.ty);
67 if !cmt.ty.is_sized(self.param_env, span) {
68 span_err!(self.tcx.sess, span, E0161,
69 "cannot move a value of type {0}: the size of {0} cannot be statically determined",
74 fn matched_pat(&mut self,
75 _matched_pat: &hir::Pat,
77 _mode: euv::MatchMode) {}
79 fn consume_pat(&mut self,
80 _consume_pat: &hir::Pat,
82 _mode: euv::ConsumeMode) {
86 _borrow_id: ast::NodeId,
89 _loan_region: ty::Region,
91 _loan_cause: euv::LoanCause) {
94 fn decl_without_init(&mut self,
100 _assignment_id: ast::NodeId,
101 _assignment_span: Span,
102 _assignee_cmt: mc::cmt,
103 _mode: euv::MutateMode) {