| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Checks that all rvalues in a crate have statically known size. check_crate |
| // is the public starting point. |
| |
| use rustc::dep_graph::DepNode; |
| use rustc::middle::expr_use_visitor as euv; |
| use rustc::middle::mem_categorization as mc; |
| use rustc::ty::{self, TyCtxt}; |
| use rustc::traits::Reveal; |
| |
| use rustc::hir; |
| use rustc::hir::intravisit::{Visitor, NestedVisitorMap}; |
| use syntax::ast; |
| use syntax_pos::Span; |
| |
| pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) { |
| let mut rvcx = RvalueContext { tcx: tcx }; |
| tcx.visit_all_item_likes_in_krate(DepNode::RvalueCheck, &mut rvcx.as_deep_visitor()); |
| } |
| |
| struct RvalueContext<'a, 'tcx: 'a> { |
| tcx: TyCtxt<'a, 'tcx, 'tcx>, |
| } |
| |
| impl<'a, 'tcx> Visitor<'tcx> for RvalueContext<'a, 'tcx> { |
| fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> { |
| NestedVisitorMap::None |
| } |
| |
| fn visit_nested_body(&mut self, body_id: hir::BodyId) { |
| let body = self.tcx.hir.body(body_id); |
| self.tcx.infer_ctxt(body_id, Reveal::NotSpecializable).enter(|infcx| { |
| let mut delegate = RvalueContextDelegate { |
| tcx: infcx.tcx, |
| param_env: &infcx.parameter_environment |
| }; |
| euv::ExprUseVisitor::new(&mut delegate, &infcx).consume_body(body); |
| }); |
| self.visit_body(body); |
| } |
| } |
| |
| struct RvalueContextDelegate<'a, 'gcx: 'a+'tcx, 'tcx: 'a> { |
| tcx: TyCtxt<'a, 'gcx, 'tcx>, |
| param_env: &'a ty::ParameterEnvironment<'gcx>, |
| } |
| |
| impl<'a, 'gcx, 'tcx> euv::Delegate<'tcx> for RvalueContextDelegate<'a, 'gcx, 'tcx> { |
| fn consume(&mut self, |
| _: ast::NodeId, |
| span: Span, |
| cmt: mc::cmt<'tcx>, |
| _: euv::ConsumeMode) { |
| debug!("consume; cmt: {:?}; type: {:?}", *cmt, cmt.ty); |
| let ty = self.tcx.lift_to_global(&cmt.ty).unwrap(); |
| if !ty.is_sized(self.tcx.global_tcx(), self.param_env, span) { |
| span_err!(self.tcx.sess, span, E0161, |
| "cannot move a value of type {0}: the size of {0} cannot be statically determined", |
| ty); |
| } |
| } |
| |
| fn matched_pat(&mut self, |
| _matched_pat: &hir::Pat, |
| _cmt: mc::cmt, |
| _mode: euv::MatchMode) {} |
| |
| fn consume_pat(&mut self, |
| _consume_pat: &hir::Pat, |
| _cmt: mc::cmt, |
| _mode: euv::ConsumeMode) { |
| } |
| |
| fn borrow(&mut self, |
| _borrow_id: ast::NodeId, |
| _borrow_span: Span, |
| _cmt: mc::cmt, |
| _loan_region: &'tcx ty::Region, |
| _bk: ty::BorrowKind, |
| _loan_cause: euv::LoanCause) { |
| } |
| |
| fn decl_without_init(&mut self, |
| _id: ast::NodeId, |
| _span: Span) { |
| } |
| |
| fn mutate(&mut self, |
| _assignment_id: ast::NodeId, |
| _assignment_span: Span, |
| _assignee_cmt: mc::cmt, |
| _mode: euv::MutateMode) { |
| } |
| } |