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// Copyright 2012 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.
// This test attempts to force the dynamic linker to resolve
// external symbols as close to the red zone as possible.
use std::rand;
use std::task;
mod rustrt {
use std::libc;
pub extern {
pub fn debug_get_stk_seg() -> *u8;
pub fn rust_get_sched_id() -> libc::intptr_t;
pub fn rust_get_argc() -> libc::c_int;
pub fn get_task_id() -> libc::intptr_t;
pub fn rust_sched_threads();
pub fn rust_get_task();
}
}
fn calllink01() { unsafe { rustrt::rust_get_sched_id(); } }
fn calllink02() { unsafe { rustrt::rust_get_argc(); } }
fn calllink08() { unsafe { rustrt::get_task_id(); } }
fn calllink09() { unsafe { rustrt::rust_sched_threads(); } }
fn calllink10() { unsafe { rustrt::rust_get_task(); } }
fn runtest(f: extern fn(), frame_backoff: u32) {
runtest2(f, frame_backoff, 0 as *u8);
}
fn runtest2(f: extern fn(), frame_backoff: u32, last_stk: *u8) -> u32 {
unsafe {
let curr_stk = rustrt::debug_get_stk_seg();
if (last_stk != curr_stk && last_stk != 0 as *u8) {
// We switched stacks, go back and try to hit the dynamic linker
frame_backoff
} else {
let frame_backoff = runtest2(copy f, frame_backoff, curr_stk);
if frame_backoff > 1u32 {
frame_backoff - 1u32
} else if frame_backoff == 1u32 {
f();
0u32
} else {
0u32
}
}
}
}
pub fn main() {
use std::rand::Rng;
let fns = ~[
calllink01,
calllink02,
calllink08,
calllink09,
calllink10
];
let mut rng = rand::rng();
for fns.iter().advance |f| {
let f = *f;
let sz = rng.next() % 256u32 + 256u32;
let frame_backoff = rng.next() % 10u32 + 1u32;
task::try(|| runtest(f, frame_backoff) );
}
}
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