mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 07:14:28 +00:00
260 lines
8.4 KiB
Rust
260 lines
8.4 KiB
Rust
// run-pass
|
|
#![allow(non_upper_case_globals)]
|
|
|
|
// Issue 23611: this test is ensuring that, for an instance `X` of the
|
|
// enum `E`, if you swap in a different variant during the execution
|
|
// of the `<E as Drop>::drop`, then the appropriate substructure will
|
|
// be torn down after the `<E as Drop>::drop` method returns.
|
|
|
|
use std::cell::RefCell;
|
|
use std::mem;
|
|
|
|
use self::d::D;
|
|
|
|
pub fn main() {
|
|
let log = RefCell::new(vec![]);
|
|
d::println("created empty log");
|
|
test(&log);
|
|
|
|
// println!("log: {:?}", &log.borrow()[..]);
|
|
assert_eq!(
|
|
&log.borrow()[..],
|
|
[
|
|
// created empty log
|
|
// +-- Make D(test_1, 10000000)
|
|
// | +-- Make D(g_b_5, 50000001)
|
|
// | | in g_B(b2b0) from E::drop, b=b4b0
|
|
// | +-- Drop D(g_b_5, 50000001)
|
|
50000001,
|
|
// |
|
|
// | +-- Make D(drop_6, 60000002)
|
|
// | | +-- Make D(g_b_5, 50000003)
|
|
// | | | in g_B(b2b0) from E::drop, b=b4b1
|
|
// | | +-- Drop D(g_b_5, 50000003)
|
|
50000003,
|
|
// | |
|
|
// | | +-- Make D(GaspB::drop_3, 30000004)
|
|
// | | | +-- Make D(g_b_5, 50000005)
|
|
// | | | | in g_B(b4b2) from GaspB::drop
|
|
// | | | +-- Drop D(g_b_5, 50000005)
|
|
50000005,
|
|
// | | |
|
|
// | | +-- Drop D(GaspB::drop_3, 30000004)
|
|
30000004,
|
|
// | |
|
|
// +-- Drop D(test_1, 10000000)
|
|
10000000,
|
|
// |
|
|
// +-- Make D(GaspA::drop_2, 20000006)
|
|
// | | +-- Make D(f_a_4, 40000007)
|
|
// | | | in f_A(a3a0) from GaspA::drop
|
|
// | | +-- Drop D(f_a_4, 40000007)
|
|
40000007,
|
|
// | |
|
|
// +-- Drop D(GaspA::drop_2, 20000006)
|
|
20000006,
|
|
// |
|
|
// +-- Drop D(drop_6, 60000002)
|
|
60000002
|
|
//
|
|
]);
|
|
|
|
// For reference purposes, the old (incorrect) behavior would produce the following
|
|
// output, which you can compare to the above:
|
|
//
|
|
// created empty log
|
|
// +-- Make D(test_1, 10000000)
|
|
// | +-- Make D(g_b_5, 50000001)
|
|
// | | in g_B(b2b0) from E::drop, b=b4b0
|
|
// | +-- Drop D(g_b_5, 50000001)
|
|
// |
|
|
// | +-- Make D(drop_6, 60000002)
|
|
// | | +-- Make D(g_b_5, 50000003)
|
|
// | | | in g_B(b2b0) from E::drop, b=b4b1
|
|
// | | +-- Drop D(g_b_5, 50000003)
|
|
// | |
|
|
// | | +-- Make D(GaspB::drop_3, 30000004)
|
|
// | | | +-- Make D(g_b_5, 50000005)
|
|
// | | | | in g_B(b4b2) from GaspB::drop
|
|
// | | | +-- Drop D(g_b_5, 50000005)
|
|
// | | |
|
|
// | | +-- Drop D(GaspB::drop_3, 30000004)
|
|
// | |
|
|
// +-- Drop D(test_1, 10000000)
|
|
// |
|
|
// +-- Make D(GaspB::drop_3, 30000006)
|
|
// | | +-- Make D(f_a_4, 40000007)
|
|
// | | | in f_A(a3a0) from GaspB::drop
|
|
// | | +-- Drop D(f_a_4, 40000007)
|
|
// | |
|
|
// +-- Drop D(GaspB::drop_3, 30000006)
|
|
// |
|
|
// +-- Drop D(drop_6, 60000002)
|
|
|
|
// Note that this calls f_A from GaspB::drop (and thus creates a D
|
|
// with a uid incorporating the origin of GaspB's drop that
|
|
// surrounds the f_A invocation), but the code as written only
|
|
// ever hands f_A off to instances of GaspA, and thus one should
|
|
// be able to prove the invariant that f_A is *only* invoked from
|
|
// from an instance of GaspA (either via the GaspA drop
|
|
// implementation or the E drop implementation). Yet the old (bad)
|
|
// behavior allowed a call to f_A to leak in while we are tearing
|
|
// down a value of type GaspB.
|
|
}
|
|
|
|
fn test<'a>(log: d::Log<'a>) {
|
|
let _e = E::B(GaspB(g_b, 0xB4B0, log, D::new("test", 1, log)), true);
|
|
}
|
|
|
|
struct GaspA<'a>(for <'b> fn(u32, &'b str, d::Log<'a>), u32, d::Log<'a>, d::D<'a>);
|
|
struct GaspB<'a>(for <'b> fn(u32, &'b str, d::Log<'a>), u32, d::Log<'a>, d::D<'a>);
|
|
|
|
impl<'a> Drop for GaspA<'a> {
|
|
fn drop(&mut self) {
|
|
let _d = d::D::new("GaspA::drop", 2, self.2);
|
|
(self.0)(self.1, "GaspA::drop", self.2);
|
|
}
|
|
}
|
|
|
|
impl<'a> Drop for GaspB<'a> {
|
|
fn drop(&mut self) {
|
|
let _d = d::D::new("GaspB::drop", 3, self.2);
|
|
(self.0)(self.1, "GaspB::drop", self.2);
|
|
}
|
|
}
|
|
|
|
enum E<'a> {
|
|
A(GaspA<'a>, bool), B(GaspB<'a>, bool),
|
|
}
|
|
|
|
fn f_a(x: u32, ctxt: &str, log: d::Log) {
|
|
let _d = d::D::new("f_a", 4, log);
|
|
d::println(&format!("in f_A({:x}) from {}", x, ctxt));
|
|
}
|
|
fn g_b(y: u32, ctxt: &str, log: d::Log) {
|
|
let _d = d::D::new("g_b", 5, log);
|
|
d::println(&format!("in g_B({:x}) from {}", y, ctxt));
|
|
}
|
|
|
|
impl<'a> Drop for E<'a> {
|
|
fn drop(&mut self) {
|
|
let (do_drop, log) = match *self {
|
|
E::A(GaspA(ref f, ref mut val_a, log, ref _d_a), ref mut do_drop) => {
|
|
f(0xA1A0, &format!("E::drop, a={:x}", val_a), log);
|
|
*val_a += 1;
|
|
// swap in do_drop := false to avoid infinite dtor regress
|
|
(mem::replace(do_drop, false), log)
|
|
}
|
|
E::B(GaspB(ref g, ref mut val_b, log, ref _d_b), ref mut do_drop) => {
|
|
g(0xB2B0, &format!("E::drop, b={:x}", val_b), log);
|
|
*val_b += 1;
|
|
// swap in do_drop := false to avoid infinite dtor regress
|
|
(mem::replace(do_drop, false), log)
|
|
}
|
|
};
|
|
|
|
#[allow(unused_must_use)]
|
|
if do_drop {
|
|
mem::replace(self, E::A(GaspA(f_a, 0xA3A0, log, D::new("drop", 6, log)), true));
|
|
}
|
|
}
|
|
}
|
|
|
|
// This module provides simultaneous printouts of the dynamic extents
|
|
// of all of the D values, in addition to logging the order that each
|
|
// is dropped.
|
|
//
|
|
// This code is similar to a support code module embedded within
|
|
// test/run-pass/issue-123338-ensure-param-drop-order.rs; however,
|
|
// that (slightly simpler) code only identifies objects in the log via
|
|
// (creation) time-stamps; this incorporates both timestamping and the
|
|
// point of origin within the source code into the unique ID (uid).
|
|
|
|
const PREF_INDENT: u32 = 20;
|
|
|
|
pub mod d {
|
|
#![allow(unused_parens)]
|
|
use std::fmt;
|
|
use std::mem;
|
|
use std::cell::RefCell;
|
|
|
|
static mut counter: u16 = 0;
|
|
static mut trails: u64 = 0;
|
|
|
|
pub type Log<'a> = &'a RefCell<Vec<u32>>;
|
|
|
|
pub fn current_width() -> u32 {
|
|
unsafe { max_width() - trails.leading_zeros() }
|
|
}
|
|
|
|
pub fn max_width() -> u32 {
|
|
unsafe {
|
|
(mem::size_of_val(&trails)*8) as u32
|
|
}
|
|
}
|
|
|
|
pub fn indent_println(my_trails: u32, s: &str) {
|
|
let mut indent: String = String::new();
|
|
for i in 0..my_trails {
|
|
unsafe {
|
|
if trails & (1 << i) != 0 {
|
|
indent = indent + "| ";
|
|
} else {
|
|
indent = indent + " ";
|
|
}
|
|
}
|
|
}
|
|
println!("{}{}", indent, s);
|
|
}
|
|
|
|
pub fn println(s: &str) {
|
|
indent_println(super::PREF_INDENT, s);
|
|
}
|
|
|
|
fn first_avail() -> u32 {
|
|
unsafe {
|
|
for i in 0..64 {
|
|
if trails & (1 << i) == 0 {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
panic!("exhausted trails");
|
|
}
|
|
|
|
pub struct D<'a> {
|
|
name: &'static str, i: u8, uid: u32, trail: u32, log: Log<'a>
|
|
}
|
|
|
|
impl<'a> fmt::Display for D<'a> {
|
|
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
|
|
write!(w, "D({}_{}, {})", self.name, self.i, self.uid)
|
|
}
|
|
}
|
|
|
|
impl<'a> D<'a> {
|
|
pub fn new(name: &'static str, i: u8, log: Log<'a>) -> D<'a> {
|
|
unsafe {
|
|
let trail = first_avail();
|
|
let ctr = ((i as u32) * 10_000_000) + (counter as u32);
|
|
counter += 1;
|
|
trails |= (1 << trail);
|
|
let ret = D {
|
|
name: name, i: i, log: log, uid: ctr, trail: trail
|
|
};
|
|
indent_println(trail, &format!("+-- Make {}", ret));
|
|
ret
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Drop for D<'a> {
|
|
fn drop(&mut self) {
|
|
unsafe { trails &= !(1 << self.trail); };
|
|
self.log.borrow_mut().push(self.uid);
|
|
indent_println(self.trail, &format!("+-- Drop {}", self));
|
|
indent_println(::PREF_INDENT, "");
|
|
}
|
|
}
|
|
}
|