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// 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 middle::expr_use_visitor as euv;
use middle::mem_categorization as mc;
use middle::ty::ParameterEnvironment;
use middle::ty;
use syntax::ast;
use syntax::codemap::Span;
use syntax::visit;
pub fn check_crate(tcx: &ty::ctxt,
krate: &ast::Crate) {
let mut rvcx = RvalueContext { tcx: tcx };
visit::walk_crate(&mut rvcx, krate);
}
struct RvalueContext<'a, 'tcx: 'a> {
tcx: &'a ty::ctxt<'tcx>,
}
impl<'a, 'tcx, 'v> visit::Visitor<'v> for RvalueContext<'a, 'tcx> {
fn visit_fn(&mut self,
fk: visit::FnKind<'v>,
fd: &'v ast::FnDecl,
b: &'v ast::Block,
s: Span,
fn_id: ast::NodeId) {
{
let param_env = ParameterEnvironment::for_item(self.tcx, fn_id);
let mut delegate = RvalueContextDelegate { tcx: self.tcx, param_env: ¶m_env };
let mut euv = euv::ExprUseVisitor::new(&mut delegate, ¶m_env);
euv.walk_fn(fd, b);
}
visit::walk_fn(self, fk, fd, b, s)
}
}
struct RvalueContextDelegate<'a, 'tcx: 'a> {
tcx: &'a ty::ctxt<'tcx>,
param_env: &'a ty::ParameterEnvironment<'a,'tcx>,
}
impl<'a, 'tcx> euv::Delegate<'tcx> for RvalueContextDelegate<'a, 'tcx> {
fn consume(&mut self,
_: ast::NodeId,
span: Span,
cmt: mc::cmt<'tcx>,
_: euv::ConsumeMode) {
debug!("consume; cmt: {:?}; type: {:?}", *cmt, cmt.ty);
if !ty::type_is_sized(Some(self.param_env), self.tcx, span, cmt.ty) {
span_err!(self.tcx.sess, span, E0161,
"cannot move a value of type {0}: the size of {0} cannot be statically determined",
cmt.ty);
}
}
fn matched_pat(&mut self,
_matched_pat: &ast::Pat,
_cmt: mc::cmt,
_mode: euv::MatchMode) {}
fn consume_pat(&mut self,
_consume_pat: &ast::Pat,
_cmt: mc::cmt,
_mode: euv::ConsumeMode) {
}
fn borrow(&mut self,
_borrow_id: ast::NodeId,
_borrow_span: Span,
_cmt: mc::cmt,
_loan_region: 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) {
}
}
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