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[rustc.git] / src / librustc_passes / rvalues.rs
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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.
4//
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.
10
11// Checks that all rvalues in a crate have statically known size. check_crate
12// is the public starting point.
13
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14use rustc::dep_graph::DepNode;
15use rustc::middle::expr_use_visitor as euv;
54a0048b 16use rustc::infer;
7453a54e 17use rustc::middle::mem_categorization as mc;
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18use rustc::ty::{self, TyCtxt, ParameterEnvironment};
19use rustc::traits::ProjectionMode;
1a4d82fc 20
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21use rustc::hir;
22use rustc::hir::intravisit;
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23use syntax::ast;
24use syntax::codemap::Span;
1a4d82fc 25
54a0048b 26pub fn check_crate(tcx: &TyCtxt) {
1a4d82fc 27 let mut rvcx = RvalueContext { tcx: tcx };
9cc50fc6 28 tcx.visit_all_items_in_krate(DepNode::RvalueCheck, &mut rvcx);
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29}
30
31struct RvalueContext<'a, 'tcx: 'a> {
54a0048b 32 tcx: &'a TyCtxt<'tcx>,
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33}
34
92a42be0 35impl<'a, 'tcx, 'v> intravisit::Visitor<'v> for RvalueContext<'a, 'tcx> {
1a4d82fc 36 fn visit_fn(&mut self,
92a42be0 37 fk: intravisit::FnKind<'v>,
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38 fd: &'v hir::FnDecl,
39 b: &'v hir::Block,
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40 s: Span,
41 fn_id: ast::NodeId) {
42 {
c1a9b12d 43 // FIXME (@jroesch) change this to be an inference context
1a4d82fc 44 let param_env = ParameterEnvironment::for_item(self.tcx, fn_id);
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45 let infcx = infer::new_infer_ctxt(self.tcx,
46 &self.tcx.tables,
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47 Some(param_env.clone()),
48 ProjectionMode::AnyFinal);
1a4d82fc 49 let mut delegate = RvalueContextDelegate { tcx: self.tcx, param_env: &param_env };
c1a9b12d 50 let mut euv = euv::ExprUseVisitor::new(&mut delegate, &infcx);
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51 euv.walk_fn(fd, b);
52 }
92a42be0 53 intravisit::walk_fn(self, fk, fd, b, s)
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54 }
55}
56
57struct RvalueContextDelegate<'a, 'tcx: 'a> {
54a0048b 58 tcx: &'a TyCtxt<'tcx>,
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59 param_env: &'a ty::ParameterEnvironment<'a,'tcx>,
60}
61
62impl<'a, 'tcx> euv::Delegate<'tcx> for RvalueContextDelegate<'a, 'tcx> {
63 fn consume(&mut self,
64 _: ast::NodeId,
65 span: Span,
66 cmt: mc::cmt<'tcx>,
67 _: euv::ConsumeMode) {
62682a34 68 debug!("consume; cmt: {:?}; type: {:?}", *cmt, cmt.ty);
c1a9b12d 69 if !cmt.ty.is_sized(self.param_env, span) {
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70 span_err!(self.tcx.sess, span, E0161,
71 "cannot move a value of type {0}: the size of {0} cannot be statically determined",
62682a34 72 cmt.ty);
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73 }
74 }
75
76 fn matched_pat(&mut self,
e9174d1e 77 _matched_pat: &hir::Pat,
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78 _cmt: mc::cmt,
79 _mode: euv::MatchMode) {}
80
81 fn consume_pat(&mut self,
e9174d1e 82 _consume_pat: &hir::Pat,
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83 _cmt: mc::cmt,
84 _mode: euv::ConsumeMode) {
85 }
86
87 fn borrow(&mut self,
88 _borrow_id: ast::NodeId,
89 _borrow_span: Span,
90 _cmt: mc::cmt,
91 _loan_region: ty::Region,
92 _bk: ty::BorrowKind,
93 _loan_cause: euv::LoanCause) {
94 }
95
96 fn decl_without_init(&mut self,
97 _id: ast::NodeId,
98 _span: Span) {
99 }
100
101 fn mutate(&mut self,
102 _assignment_id: ast::NodeId,
103 _assignment_span: Span,
104 _assignee_cmt: mc::cmt,
105 _mode: euv::MutateMode) {
106 }
107}