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rustc: Don't generate code for unreachable expressions

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The way we deal with unreachable expressions in trans is pretty ad hoc,
but this at least doesn't make it worse, and eliminates the LLVM
assertion failure reported in #5741.
This commit is contained in:
Tim Chevalier 2013-05-21 13:15:48 -07:00
parent 64963d6cba
commit 8c68c4a52c
2 changed files with 18 additions and 0 deletions
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4
src/librustc/middle/trans/expr.rs
View File

@ -499,6 +499,10 @@ fn trans_rvalue_stmt_unadjusted(bcx: block, expr: @ast::expr) -> block {
let mut bcx = bcx;
let _icx = bcx.insn_ctxt("trans_rvalue_stmt");
if bcx.unreachable {
return bcx;
}
trace_span!(bcx, expr.span, @shorten(bcx.expr_to_str(expr)));
match expr.node {

14
src/test/run-pass/issue-5741.rs Normal file
View File

@ -0,0 +1,14 @@
// Copyright 2013 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.
fn main() {
return;
while io::stdin().read_line() != ~"quit" { };
}