169 lines
4.7 KiB
Rust
169 lines
4.7 KiB
Rust
//@ run-pass
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#![allow(non_upper_case_globals)]
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// This test is ensuring that parameters are indeed dropped after
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// temporaries in a fn body.
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use std::cell::RefCell;
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use self::d::D;
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pub fn main() {
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let log = RefCell::new(vec![]);
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d::println("created empty log");
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test(&log);
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assert_eq!(
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&log.borrow()[..],
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[
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// created empty log
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// +-- Make D(da_0, 0)
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// | +-- Make D(de_1, 1)
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// | | calling foo
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// | | entered foo
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// | | +-- Make D(de_2, 2)
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// | | | +-- Make D(da_1, 3)
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// | | | | +-- Make D(de_3, 4)
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// | | | | | +-- Make D(de_4, 5)
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3, // | | | +-- Drop D(da_1, 3)
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// | | | | |
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4, // | | | +-- Drop D(de_3, 4)
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// | | | |
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// | | | | eval tail of foo
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// | | | +-- Make D(de_5, 6)
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// | | | | +-- Make D(de_6, 7)
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5, // | | | | | +-- Drop D(de_4, 5)
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// | | | | |
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2, // | | +-- Drop D(de_2, 2)
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// | | | |
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6, // | | +-- Drop D(de_5, 6)
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// | | |
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1, // | +-- Drop D(de_1, 1)
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// | |
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0, // +-- Drop D(da_0, 0)
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// |
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// | result D(de_6, 7)
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7 // +-- Drop D(de_6, 7)
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]
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);
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}
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fn test<'a>(log: d::Log<'a>) {
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let da = D::new("da", 0, log);
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let de = D::new("de", 1, log);
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d::println("calling foo");
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let result = foo(da, de);
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d::println(&format!("result {}", result));
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}
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fn foo<'a>(da0: D<'a>, de1: D<'a>) -> D<'a> {
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d::println("entered foo");
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let de2 = de1.incr(); // creates D(de_2, 2)
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let de4 = {
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let _da1 = da0.incr(); // creates D(da_1, 3)
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de2.incr().incr() // creates D(de_3, 4) and D(de_4, 5)
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};
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d::println("eval tail of foo");
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de4.incr().incr() // creates D(de_5, 6) and D(de_6, 7)
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}
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// This module provides simultaneous printouts of the dynamic extents
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// of all of the D values, in addition to logging the order that each
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// is dropped.
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const PREF_INDENT: u32 = 16;
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pub mod d {
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#![allow(unused_parens)]
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use std::cell::RefCell;
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use std::fmt;
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use std::mem;
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static mut counter: u32 = 0;
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static mut trails: u64 = 0;
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pub type Log<'a> = &'a RefCell<Vec<u32>>;
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pub fn current_width() -> u32 {
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unsafe { max_width() - trails.leading_zeros() }
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}
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pub fn max_width() -> u32 {
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unsafe {
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(mem::size_of_val(&trails) * 8) as u32
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//~^ WARN shared reference to mutable static is discouraged [static_mut_refs]
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}
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}
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pub fn indent_println(my_trails: u32, s: &str) {
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let mut indent: String = String::new();
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for i in 0..my_trails {
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unsafe {
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if trails & (1 << i) != 0 {
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indent = indent + "| ";
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} else {
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indent = indent + " ";
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}
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}
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}
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println!("{}{}", indent, s);
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}
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pub fn println(s: &str) {
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indent_println(super::PREF_INDENT, s);
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}
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fn first_avail() -> u32 {
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unsafe {
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for i in 0..64 {
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if trails & (1 << i) == 0 {
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return i;
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}
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}
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}
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panic!("exhausted trails");
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}
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pub struct D<'a> {
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name: &'static str,
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i: u32,
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uid: u32,
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trail: u32,
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log: Log<'a>,
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}
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impl<'a> fmt::Display for D<'a> {
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fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
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write!(w, "D({}_{}, {})", self.name, self.i, self.uid)
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}
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}
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impl<'a> D<'a> {
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pub fn new(name: &'static str, i: u32, log: Log<'a>) -> D<'a> {
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unsafe {
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let trail = first_avail();
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let ctr = counter;
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counter += 1;
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trails |= (1 << trail);
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let ret = D { name: name, i: i, log: log, uid: ctr, trail: trail };
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indent_println(trail, &format!("+-- Make {}", ret));
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ret
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}
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}
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pub fn incr(&self) -> D<'a> {
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D::new(self.name, self.i + 1, self.log)
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}
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}
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impl<'a> Drop for D<'a> {
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fn drop(&mut self) {
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unsafe {
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trails &= !(1 << self.trail);
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};
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self.log.borrow_mut().push(self.uid);
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indent_println(self.trail, &format!("+-- Drop {}", self));
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indent_println(::PREF_INDENT, "");
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}
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}
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}
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