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Rollup merge of #52223 - ljedrz:dyn_liballoc, r=cramertj

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Deny bare trait objects in in src/liballoc

Enforce #![deny(bare_trait_objects)] in src/liballoc.
This commit is contained in:
Mark Rousskov 2018-07-11 12:38:37 -06:00 committed by GitHub
commit d096f6ae85
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 39 additions and 38 deletions
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18
src/liballoc/boxed.rs
View File

@ -446,7 +446,7 @@ impl From<Box<str>> for Box<[u8]> {
}
}
impl Box<Any> {
impl Box<dyn Any> {
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
/// Attempt to downcast the box to a concrete type.
@ -468,10 +468,10 @@ impl Box<Any> {
/// print_if_string(Box::new(0i8));
/// }
/// ```
pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<dyn Any>> {
if self.is::<T>() {
unsafe {
let raw: *mut Any = Box::into_raw(self);
let raw: *mut dyn Any = Box::into_raw(self);
Ok(Box::from_raw(raw as *mut T))
}
} else {
@ -480,7 +480,7 @@ impl Box<Any> {
}
}
impl Box<Any + Send> {
impl Box<dyn Any + Send> {
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
/// Attempt to downcast the box to a concrete type.
@ -502,10 +502,10 @@ impl Box<Any + Send> {
/// print_if_string(Box::new(0i8));
/// }
/// ```
pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any + Send>> {
<Box<Any>>::downcast(self).map_err(|s| unsafe {
pub fn downcast<T: Any>(self) -> Result<Box<T>, Box<dyn Any + Send>> {
<Box<dyn Any>>::downcast(self).map_err(|s| unsafe {
// reapply the Send marker
Box::from_raw(Box::into_raw(s) as *mut (Any + Send))
Box::from_raw(Box::into_raw(s) as *mut (dyn Any + Send))
})
}
}
@ -643,7 +643,7 @@ impl<A, F> FnBox<A> for F
#[unstable(feature = "fnbox",
reason = "will be deprecated if and when `Box<FnOnce>` becomes usable", issue = "28796")]
impl<'a, A, R> FnOnce<A> for Box<FnBox<A, Output = R> + 'a> {
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + 'a> {
type Output = R;
extern "rust-call" fn call_once(self, args: A) -> R {
@ -653,7 +653,7 @@ impl<'a, A, R> FnOnce<A> for Box<FnBox<A, Output = R> + 'a> {
#[unstable(feature = "fnbox",
reason = "will be deprecated if and when `Box<FnOnce>` becomes usable", issue = "28796")]
impl<'a, A, R> FnOnce<A> for Box<FnBox<A, Output = R> + Send + 'a> {
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + Send + 'a> {
type Output = R;
extern "rust-call" fn call_once(self, args: A) -> R {

20
src/liballoc/boxed_test.rs
View File

@ -31,8 +31,8 @@ struct Test;
#[test]
fn any_move() {
let a = Box::new(8) as Box<Any>;
let b = Box::new(Test) as Box<Any>;
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
match a.downcast::<i32>() {
Ok(a) => {
@ -47,8 +47,8 @@ fn any_move() {
Err(..) => panic!(),
}
let a = Box::new(8) as Box<Any>;
let b = Box::new(Test) as Box<Any>;
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
assert!(a.downcast::<Box<Test>>().is_err());
assert!(b.downcast::<Box<i32>>().is_err());
@ -56,8 +56,8 @@ fn any_move() {
#[test]
fn test_show() {
let a = Box::new(8) as Box<Any>;
let b = Box::new(Test) as Box<Any>;
let a = Box::new(8) as Box<dyn Any>;
let b = Box::new(Test) as Box<dyn Any>;
let a_str = format!("{:?}", a);
let b_str = format!("{:?}", b);
assert_eq!(a_str, "Any");
@ -65,8 +65,8 @@ fn test_show() {
static EIGHT: usize = 8;
static TEST: Test = Test;
let a = &EIGHT as &Any;
let b = &TEST as &Any;
let a = &EIGHT as &dyn Any;
let b = &TEST as &dyn Any;
let s = format!("{:?}", a);
assert_eq!(s, "Any");
let s = format!("{:?}", b);
@ -110,12 +110,12 @@ fn raw_trait() {
}
}
let x: Box<Foo> = Box::new(Bar(17));
let x: Box<dyn Foo> = Box::new(Bar(17));
let p = Box::into_raw(x);
unsafe {
assert_eq!(17, (*p).get());
(*p).set(19);
let y: Box<Foo> = Box::from_raw(p);
let y: Box<dyn Foo> = Box::from_raw(p);
assert_eq!(19, y.get());
}
}

1
src/liballoc/lib.rs
View File

@ -72,6 +72,7 @@
test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
#![no_std]
#![needs_allocator]
#![deny(bare_trait_objects)]
#![deny(missing_debug_implementations)]
#![cfg_attr(test, allow(deprecated))] // rand

18
src/liballoc/rc.rs
View File

@ -618,7 +618,7 @@ impl<T: Clone> Rc<T> {
}
}
impl Rc<Any> {
impl Rc<dyn Any> {
#[inline]
#[stable(feature = "rc_downcast", since = "1.29.0")]
/// Attempt to downcast the `Rc<Any>` to a concrete type.
@ -641,7 +641,7 @@ impl Rc<Any> {
/// print_if_string(Rc::new(0i8));
/// }
/// ```
pub fn downcast<T: Any>(self) -> Result<Rc<T>, Rc<Any>> {
pub fn downcast<T: Any>(self) -> Result<Rc<T>, Rc<dyn Any>> {
if (*self).is::<T>() {
let ptr = self.ptr.cast::<RcBox<T>>();
forget(self);
@ -1554,7 +1554,7 @@ mod tests {
assert_eq!(unsafe { &*ptr }, "foo");
assert_eq!(rc, rc2);
let rc: Rc<Display> = Rc::new(123);
let rc: Rc<dyn Display> = Rc::new(123);
let ptr = Rc::into_raw(rc.clone());
let rc2 = unsafe { Rc::from_raw(ptr) };
@ -1755,8 +1755,8 @@ mod tests {
use std::fmt::Display;
use std::string::ToString;
let b: Box<Display> = box 123;
let r: Rc<Display> = Rc::from(b);
let b: Box<dyn Display> = box 123;
let r: Rc<dyn Display> = Rc::from(b);
assert_eq!(r.to_string(), "123");
}
@ -1765,8 +1765,8 @@ mod tests {
fn test_from_box_trait_zero_sized() {
use std::fmt::Debug;
let b: Box<Debug> = box ();
let r: Rc<Debug> = Rc::from(b);
let b: Box<dyn Debug> = box ();
let r: Rc<dyn Debug> = Rc::from(b);
assert_eq!(format!("{:?}", r), "()");
}
@ -1783,8 +1783,8 @@ mod tests {
fn test_downcast() {
use std::any::Any;
let r1: Rc<Any> = Rc::new(i32::max_value());
let r2: Rc<Any> = Rc::new("abc");
let r1: Rc<dyn Any> = Rc::new(i32::max_value());
let r2: Rc<dyn Any> = Rc::new("abc");
assert!(r1.clone().downcast::<u32>().is_err());

20
src/liballoc/sync.rs
View File

@ -978,10 +978,10 @@ unsafe impl<#[may_dangle] T: ?Sized> Drop for Arc<T> {
}
}
impl Arc<Any + Send + Sync> {
impl Arc<dyn Any + Send + Sync> {
#[inline]
#[stable(feature = "rc_downcast", since = "1.29.0")]
/// Attempt to downcast the `Arc<Any + Send + Sync>` to a concrete type.
/// Attempt to downcast the `Arc<dyn Any + Send + Sync>` to a concrete type.
///
/// # Examples
///
@ -989,7 +989,7 @@ impl Arc<Any + Send + Sync> {
/// use std::any::Any;
/// use std::sync::Arc;
///
/// fn print_if_string(value: Arc<Any + Send + Sync>) {
/// fn print_if_string(value: Arc<dyn Any + Send + Sync>) {
/// if let Ok(string) = value.downcast::<String>() {
/// println!("String ({}): {}", string.len(), string);
/// }
@ -1574,7 +1574,7 @@ mod tests {
assert_eq!(unsafe { &*ptr }, "foo");
assert_eq!(arc, arc2);
let arc: Arc<Display> = Arc::new(123);
let arc: Arc<dyn Display> = Arc::new(123);
let ptr = Arc::into_raw(arc.clone());
let arc2 = unsafe { Arc::from_raw(ptr) };
@ -1879,8 +1879,8 @@ mod tests {
use std::fmt::Display;
use std::string::ToString;
let b: Box<Display> = box 123;
let r: Arc<Display> = Arc::from(b);
let b: Box<dyn Display> = box 123;
let r: Arc<dyn Display> = Arc::from(b);
assert_eq!(r.to_string(), "123");
}
@ -1889,8 +1889,8 @@ mod tests {
fn test_from_box_trait_zero_sized() {
use std::fmt::Debug;
let b: Box<Debug> = box ();
let r: Arc<Debug> = Arc::from(b);
let b: Box<dyn Debug> = box ();
let r: Arc<dyn Debug> = Arc::from(b);
assert_eq!(format!("{:?}", r), "()");
}
@ -1907,8 +1907,8 @@ mod tests {
fn test_downcast() {
use std::any::Any;
let r1: Arc<Any + Send + Sync> = Arc::new(i32::max_value());
let r2: Arc<Any + Send + Sync> = Arc::new("abc");
let r1: Arc<dyn Any + Send + Sync> = Arc::new(i32::max_value());
let r2: Arc<dyn Any + Send + Sync> = Arc::new("abc");
assert!(r1.clone().downcast::<u32>().is_err());