tests for #[may_dangle] attribute.
This commit is contained in:
Felix S. Klock II
parent
e185cd5190
commit
fa7f69cdaa
7 changed files with 428 additions and 0 deletions
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(generic_param_attrs)]
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#![feature(dropck_eyepatch)]
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// The point of this test is to illustrate that the `#[may_dangle]`
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// attribute specifically allows, in the context of a type
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// implementing `Drop`, a generic parameter to be instantiated with a
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// lifetime that does not strictly outlive the owning type itself,
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// and that this attributes effects are preserved when importing
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// the type from another crate.
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//
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// See also dropck-eyepatch.rs for more information about the general
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// structure of the test.
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use std::fmt;
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pub struct Dt<A: fmt::Debug>(pub &'static str, pub A);
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pub struct Dr<'a, B:'a+fmt::Debug>(pub &'static str, pub &'a B);
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pub struct Pt<A,B: fmt::Debug>(pub &'static str, pub A, pub B);
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pub struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(pub &'static str, pub &'a B, pub &'b B);
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pub struct St<A: fmt::Debug>(pub &'static str, pub A);
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pub struct Sr<'a, B:'a+fmt::Debug>(pub &'static str, pub &'a B);
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impl<A: fmt::Debug> Drop for Dt<A> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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impl<'a, B: fmt::Debug> Drop for Dr<'a, B> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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unsafe impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> {
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// (unsafe to access self.1 due to #[may_dangle] on A)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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unsafe impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> {
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// (unsafe to access self.1 due to #[may_dangle] on 'a)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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45
src/test/compile-fail/dropck-eyepatch-extern-crate.rs
Normal file
45
src/test/compile-fail/dropck-eyepatch-extern-crate.rs
Normal file
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@ -0,0 +1,45 @@
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// aux-build:dropck_eyepatch_extern_crate.rs
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extern crate dropck_eyepatch_extern_crate as other;
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use other::{Dt,Dr,Pt,Pr,St,Sr};
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fn main() {
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use std::cell::Cell;
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let c_long;
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let (c, mut dt, mut dr, mut pt, mut pr, st, sr)
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: (Cell<_>, Dt<_>, Dr<_>, Pt<_, _>, Pr<_>, St<_>, Sr<_>);
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c_long = Cell::new(1);
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c = Cell::new(1);
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// No error: sufficiently long-lived state can be referenced in dtors
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dt = Dt("dt", &c_long);
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dr = Dr("dr", &c_long);
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// Error: destructor order imprecisely modelled
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dt = Dt("dt", &c); //~ ERROR `c` does not live long enough
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dr = Dr("dr", &c); //~ ERROR `c` does not live long enough
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// No error: Drop impl asserts .1 (A and &'a _) are not accessed
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pt = Pt("pt", &c, &c_long);
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pr = Pr("pr", &c, &c_long);
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// Error: Drop impl's assertion does not apply to `B` nor `&'b _`
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pt = Pt("pt", &c_long, &c); //~ ERROR `c` does not live long enough
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pr = Pr("pr", &c_long, &c); //~ ERROR `c` does not live long enough
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// No error: St and Sr have no destructor.
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st = St("st", &c);
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sr = Sr("sr", &c);
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println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0));
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}
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96
src/test/compile-fail/dropck-eyepatch.rs
Normal file
96
src/test/compile-fail/dropck-eyepatch.rs
Normal file
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(generic_param_attrs)]
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#![feature(dropck_eyepatch)]
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// The point of this test is to illustrate that the `#[may_dangle]`
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// attribute specifically allows, in the context of a type
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// implementing `Drop`, a generic parameter to be instantiated with a
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// lifetime that does not strictly outlive the owning type itself.
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//
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// Here we test that only the expected errors are issued.
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//
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// The illustration is made concrete by comparison with two variations
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// on the type with `#[may_dangle]`:
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//
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// 1. an analogous type that does not implement `Drop` (and thus
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// should exhibit maximal flexibility with respect to dropck), and
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//
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// 2. an analogous type that does not use `#[may_dangle]` (and thus
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// should exhibit the standard limitations imposed by dropck.
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//
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// The types in this file follow a pattern, {D,P,S}{t,r}, where:
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//
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// - D means "I implement Drop"
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//
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// - P means "I implement Drop but guarantee my (first) parameter is
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// pure, i.e. not accessed from the destructor"; no other parameters
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// are pure.
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//
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// - S means "I do not implement Drop"
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//
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// - t suffix is used when the first generic is a type
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//
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// - r suffix is used when the first generic is a lifetime.
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use std::fmt;
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struct Dt<A: fmt::Debug>(&'static str, A);
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struct Dr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
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struct Pt<A,B: fmt::Debug>(&'static str, A, B);
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struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(&'static str, &'a B, &'b B);
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struct St<A: fmt::Debug>(&'static str, A);
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struct Sr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
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impl<A: fmt::Debug> Drop for Dt<A> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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impl<'a, B: fmt::Debug> Drop for Dr<'a, B> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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unsafe impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> {
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// (unsafe to access self.1 due to #[may_dangle] on A)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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unsafe impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> {
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// (unsafe to access self.1 due to #[may_dangle] on 'a)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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fn main() {
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use std::cell::Cell;
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let c_long;
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let (c, mut dt, mut dr, mut pt, mut pr, st, sr)
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: (Cell<_>, Dt<_>, Dr<_>, Pt<_, _>, Pr<_>, St<_>, Sr<_>);
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c_long = Cell::new(1);
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c = Cell::new(1);
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// No error: sufficiently long-lived state can be referenced in dtors
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dt = Dt("dt", &c_long);
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dr = Dr("dr", &c_long);
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// Error: destructor order imprecisely modelled
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dt = Dt("dt", &c); //~ ERROR `c` does not live long enough
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dr = Dr("dr", &c); //~ ERROR `c` does not live long enough
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// No error: Drop impl asserts .1 (A and &'a _) are not accessed
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pt = Pt("pt", &c, &c_long);
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pr = Pr("pr", &c, &c_long);
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// Error: Drop impl's assertion does not apply to `B` nor `&'b _`
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pt = Pt("pt", &c_long, &c); //~ ERROR `c` does not live long enough
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pr = Pr("pr", &c_long, &c); //~ ERROR `c` does not live long enough
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// No error: St and Sr have no destructor.
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st = St("st", &c);
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sr = Sr("sr", &c);
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println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0));
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}
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20
src/test/compile-fail/feature-gate-may-dangle.rs
Normal file
20
src/test/compile-fail/feature-gate-may-dangle.rs
Normal file
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Check that `may_dangle` is rejected if `dropck_eyepatch` feature gate is absent.
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#![feature(generic_param_attrs)]
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struct Pt<A>(A);
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impl<#[may_dangle] A> Drop for Pt<A> {
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//~^ ERROR may_dangle has unstable semantics and may be removed in the future
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//~| HELP add #![feature(dropck_eyepatch)] to the crate attributes to enable
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fn drop(&mut self) { }
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}
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61
src/test/run-pass/auxiliary/dropck_eyepatch_extern_crate.rs
Normal file
61
src/test/run-pass/auxiliary/dropck_eyepatch_extern_crate.rs
Normal file
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@ -0,0 +1,61 @@
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(generic_param_attrs)]
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#![feature(dropck_eyepatch)]
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// The point of this test is to illustrate that the `#[may_dangle]`
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// attribute specifically allows, in the context of a type
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// implementing `Drop`, a generic parameter to be instantiated with a
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// lifetime that does not strictly outlive the owning type itself,
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// and that this attributes effects are preserved when importing
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// the type from another crate.
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//
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// See also dropck-eyepatch.rs for more information about the general
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// structure of the test.
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use std::cell::RefCell;
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pub trait Foo { fn foo(&self, _: &str); }
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pub struct Dt<A: Foo>(pub &'static str, pub A);
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pub struct Dr<'a, B:'a+Foo>(pub &'static str, pub &'a B);
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pub struct Pt<A,B: Foo>(pub &'static str, pub A, pub B);
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pub struct Pr<'a, 'b, B:'a+'b+Foo>(pub &'static str, pub &'a B, pub &'b B);
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pub struct St<A: Foo>(pub &'static str, pub A);
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pub struct Sr<'a, B:'a+Foo>(pub &'static str, pub &'a B);
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impl<A: Foo> Drop for Dt<A> {
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fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
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}
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impl<'a, B: Foo> Drop for Dr<'a, B> {
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fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
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}
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unsafe impl<#[may_dangle] A, B: Foo> Drop for Pt<A, B> {
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// (unsafe to access self.1 due to #[may_dangle] on A)
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fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
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}
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unsafe impl<#[may_dangle] 'a, 'b, B: Foo> Drop for Pr<'a, 'b, B> {
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// (unsafe to access self.1 due to #[may_dangle] on 'a)
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fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
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}
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impl Foo for RefCell<String> {
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fn foo(&self, s: &str) {
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let s2 = format!("{}|{}", *self.borrow(), s);
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*self.borrow_mut() = s2;
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}
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}
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impl<'a, T:Foo> Foo for &'a T {
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fn foo(&self, s: &str) {
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(*self).foo(s);
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}
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}
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48
src/test/run-pass/dropck-eyepatch-extern-crate.rs
Normal file
48
src/test/run-pass/dropck-eyepatch-extern-crate.rs
Normal file
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// aux-build:dropck_eyepatch_extern_crate.rs
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extern crate dropck_eyepatch_extern_crate as other;
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use other::{Dt,Dr,Pt,Pr,St,Sr};
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fn main() {
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use std::cell::RefCell;
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struct CheckOnDrop(RefCell<String>, &'static str);
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impl Drop for CheckOnDrop {
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fn drop(&mut self) { assert_eq!(*self.0.borrow(), self.1); }
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}
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let c_long;
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let (c, dt, dr, pt, pr, st, sr)
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: (CheckOnDrop, Dt<_>, Dr<_>, Pt<_, _>, Pr<_>, St<_>, Sr<_>);
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c_long = CheckOnDrop(RefCell::new("c_long".to_string()),
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"c_long|pr|pt|dr|dt");
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c = CheckOnDrop(RefCell::new("c".to_string()),
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"c");
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// No error: sufficiently long-lived state can be referenced in dtors
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dt = Dt("dt", &c_long.0);
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dr = Dr("dr", &c_long.0);
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// No error: Drop impl asserts .1 (A and &'a _) are not accessed
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pt = Pt("pt", &c.0, &c_long.0);
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pr = Pr("pr", &c.0, &c_long.0);
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// No error: St and Sr have no destructor.
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st = St("st", &c.0);
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sr = Sr("sr", &c.0);
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println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0));
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assert_eq!(*c_long.0.borrow(), "c_long");
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assert_eq!(*c.0.borrow(), "c");
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}
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112
src/test/run-pass/dropck-eyepatch.rs
Normal file
112
src/test/run-pass/dropck-eyepatch.rs
Normal file
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@ -0,0 +1,112 @@
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(generic_param_attrs)]
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#![feature(dropck_eyepatch)]
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// The point of this test is to illustrate that the `#[may_dangle]`
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// attribute specifically allows, in the context of a type
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// implementing `Drop`, a generic parameter to be instantiated with a
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// lifetime that does not strictly outlive the owning type itself.
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//
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// Here we test that a model use of `#[may_dangle]` will compile and run.
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//
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// The illustration is made concrete by comparison with two variations
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// on the type with `#[may_dangle]`:
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//
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// 1. an analogous type that does not implement `Drop` (and thus
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// should exhibit maximal flexibility with respect to dropck), and
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//
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// 2. an analogous type that does not use `#[may_dangle]` (and thus
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// should exhibit the standard limitations imposed by dropck.
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//
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// The types in this file follow a pattern, {D,P,S}{t,r}, where:
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//
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// - D means "I implement Drop"
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//
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// - P means "I implement Drop but guarantee my (first) parameter is
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// pure, i.e. not accessed from the destructor"; no other parameters
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// are pure.
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//
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// - S means "I do not implement Drop"
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//
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// - t suffix is used when the first generic is a type
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//
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// - r suffix is used when the first generic is a lifetime.
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trait Foo { fn foo(&self, _: &str); }
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struct Dt<A: Foo>(&'static str, A);
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struct Dr<'a, B:'a+Foo>(&'static str, &'a B);
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struct Pt<A,B: Foo>(&'static str, A, B);
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struct Pr<'a, 'b, B:'a+'b+Foo>(&'static str, &'a B, &'b B);
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struct St<A: Foo>(&'static str, A);
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struct Sr<'a, B:'a+Foo>(&'static str, &'a B);
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||||
impl<A: Foo> Drop for Dt<A> {
|
||||
fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
|
||||
}
|
||||
impl<'a, B: Foo> Drop for Dr<'a, B> {
|
||||
fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
|
||||
}
|
||||
unsafe impl<#[may_dangle] A, B: Foo> Drop for Pt<A, B> {
|
||||
// (unsafe to access self.1 due to #[may_dangle] on A)
|
||||
fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
|
||||
}
|
||||
unsafe impl<#[may_dangle] 'a, 'b, B: Foo> Drop for Pr<'a, 'b, B> {
|
||||
// (unsafe to access self.1 due to #[may_dangle] on 'a)
|
||||
fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
|
||||
}
|
||||
|
||||
fn main() {
|
||||
use std::cell::RefCell;
|
||||
|
||||
impl Foo for RefCell<String> {
|
||||
fn foo(&self, s: &str) {
|
||||
let s2 = format!("{}|{}", *self.borrow(), s);
|
||||
*self.borrow_mut() = s2;
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a, T:Foo> Foo for &'a T {
|
||||
fn foo(&self, s: &str) {
|
||||
(*self).foo(s);
|
||||
}
|
||||
}
|
||||
|
||||
struct CheckOnDrop(RefCell<String>, &'static str);
|
||||
impl Drop for CheckOnDrop {
|
||||
fn drop(&mut self) { assert_eq!(*self.0.borrow(), self.1); }
|
||||
}
|
||||
|
||||
let c_long;
|
||||
let (c, dt, dr, pt, pr, st, sr)
|
||||
: (CheckOnDrop, Dt<_>, Dr<_>, Pt<_, _>, Pr<_>, St<_>, Sr<_>);
|
||||
c_long = CheckOnDrop(RefCell::new("c_long".to_string()),
|
||||
"c_long|pr|pt|dr|dt");
|
||||
c = CheckOnDrop(RefCell::new("c".to_string()),
|
||||
"c");
|
||||
|
||||
// No error: sufficiently long-lived state can be referenced in dtors
|
||||
dt = Dt("dt", &c_long.0);
|
||||
dr = Dr("dr", &c_long.0);
|
||||
|
||||
// No error: Drop impl asserts .1 (A and &'a _) are not accessed
|
||||
pt = Pt("pt", &c.0, &c_long.0);
|
||||
pr = Pr("pr", &c.0, &c_long.0);
|
||||
|
||||
// No error: St and Sr have no destructor.
|
||||
st = St("st", &c.0);
|
||||
sr = Sr("sr", &c.0);
|
||||
|
||||
println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0));
|
||||
assert_eq!(*c_long.0.borrow(), "c_long");
|
||||
assert_eq!(*c.0.borrow(), "c");
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue