Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

stat: Work around stack overflow in rustc #15

Merged
merged 1 commit into from
Nov 10, 2016
Merged

stat: Work around stack overflow in rustc #15

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
229 changes: 123 additions & 106 deletions src/pid/stat.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ use std::io::Result;
use std::str::{self, FromStr};

use libc::{clock_t, pid_t};
use nom::{self, line_ending, space};
use nom::{self, IResult, line_ending, space};
use pid::State;

use parsers::{
Expand Down Expand Up @@ -178,111 +178,128 @@ named!(parse_stat_state<State>,
| tag!("W") => { |_| State::Waking }
| tag!("P") => { |_| State::Parked }));

/// Parses the statm file format.
named!(parse_stat<Stat>,
chain!(pid: parse_i32 ~ space ~
command: parse_command ~ space ~
state: parse_stat_state ~ space ~
ppid: parse_i32 ~ space ~
pgrp: parse_i32 ~ space ~
session: parse_i32 ~ space ~
tty_nr: parse_i32 ~ space ~
tty_pgrp: parse_i32 ~ space ~
flags: parse_u32 ~ space ~
minflt: parse_usize ~ space ~
cminflt: parse_usize ~ space ~
majflt: parse_usize ~ space ~
cmajflt: parse_usize ~ space ~
utime: parse_clock ~ space ~
stime: parse_clock ~ space ~
cutime: parse_clock ~ space ~
cstime: parse_clock ~ space ~
priority: parse_i32 ~ space ~
nice: parse_i32 ~ space ~
num_threads: parse_i32 ~ space ~
/* itrealvalue */ parse_i32 ~ space ~
start_time: parse_u64 ~ space ~
vsize: parse_usize ~ space ~
rss: parse_usize ~ space ~
rsslim: parse_usize ~ space ~
start_code: parse_usize ~ space ~
end_code: parse_usize ~ space ~
startstack: parse_usize ~ space ~
kstkeep: parse_usize ~ space ~
kstkeip: parse_usize ~ space ~
signal: parse_usize ~ space ~
blocked: parse_usize ~ space ~
sigignore: parse_usize ~ space ~
sigcatch: parse_usize ~ space ~
wchan: parse_usize ~ space ~
/* nswap */ parse_usize ~ space ~
/* cnswap */ parse_usize ~ space ~
exit_signal: parse_i32 ~ space ~
processor: parse_u32 ~ space ~
rt_priority: parse_u32 ~ space ~
policy: parse_u32 ~ space ~
delayacct_blkio_ticks: parse_u64 ~ space ~
guest_time: parse_clock ~ space ~
cguest_time: parse_clock ~ space ~
start_data: parse_usize ~ space ~
end_data: parse_usize ~ space ~
start_brk: parse_usize ~ space ~
arg_start: parse_usize ~ space ~
arg_end: parse_usize ~ space ~
env_start: parse_usize ~ space ~
env_end: parse_usize ~ space ~
exit_code: parse_i32 ~ line_ending,
|| Stat {
pid: pid,
command: command,
state: state,
ppid: ppid,
pgrp: pgrp,
session: session,
tty_nr: tty_nr,
tty_pgrp: tty_pgrp,
flags: flags,
minflt: minflt,
cminflt: cminflt,
majflt: majflt,
cmajflt: cmajflt,
utime: utime,
stime: stime,
cutime: cutime,
cstime: cstime,
priority: priority,
nice: nice,
num_threads: num_threads,
start_time: start_time,
vsize: vsize,
rss: rss,
rsslim: rsslim,
start_code: start_code,
end_code: end_code,
startstack: startstack,
kstkeep: kstkeep,
kstkeip: kstkeip,
signal: signal,
blocked: blocked,
sigignore: sigignore,
sigcatch: sigcatch,
wchan: wchan,
exit_signal: exit_signal,
processor: processor,
rt_priority: rt_priority,
policy: policy,
delayacct_blkio_ticks: delayacct_blkio_ticks,
guest_time: guest_time,
cguest_time: cguest_time,
start_data: start_data,
end_data: end_data,
start_brk: start_brk,
arg_start: arg_start,
arg_end: arg_end,
env_start: env_start,
env_end: env_end,
exit_code: exit_code,
}));
// Note: this is implemented as a function insted of via `chain!` to reduce the
// stack depth in rustc by limiting the generated AST's depth. This is a work
// around for
// https://github.com/rust-lang/rust/issues/35408
// where rustc overflows its stack. The bug affects at least rustc 1.12.
fn parse_stat(input: &[u8]) -> IResult<&[u8], Stat> {
/// Helper macro for space terminated parser.
macro_rules! s {
($i:expr, $f:expr) => (terminated!($i, call!($f), space))
}
/// Helper macro for line-ending terminated parser.
macro_rules! l {
($i:expr, $f:expr) => (terminated!($i, call!($f), line_ending))
}

let rest = input;

let (rest, pid) = try_parse!(rest, s!(parse_i32 ));
let (rest, command) = try_parse!(rest, s!(parse_command ));
let (rest, state) = try_parse!(rest, s!(parse_stat_state ));
let (rest, ppid) = try_parse!(rest, s!(parse_i32 ));
let (rest, pgrp) = try_parse!(rest, s!(parse_i32 ));
let (rest, session) = try_parse!(rest, s!(parse_i32 ));
let (rest, tty_nr) = try_parse!(rest, s!(parse_i32 ));
let (rest, tty_pgrp) = try_parse!(rest, s!(parse_i32 ));
let (rest, flags) = try_parse!(rest, s!(parse_u32 ));
let (rest, minflt) = try_parse!(rest, s!(parse_usize ));
let (rest, cminflt) = try_parse!(rest, s!(parse_usize ));
let (rest, majflt) = try_parse!(rest, s!(parse_usize ));
let (rest, cmajflt) = try_parse!(rest, s!(parse_usize ));
let (rest, utime) = try_parse!(rest, s!(parse_clock ));
let (rest, stime) = try_parse!(rest, s!(parse_clock ));
let (rest, cutime) = try_parse!(rest, s!(parse_clock ));
let (rest, cstime) = try_parse!(rest, s!(parse_clock ));
let (rest, priority) = try_parse!(rest, s!(parse_i32 ));
let (rest, nice) = try_parse!(rest, s!(parse_i32 ));
let (rest, num_threads) = try_parse!(rest, s!(parse_i32 ));
let (rest, _itrealvalue) = try_parse!(rest, s!(parse_i32 ));
let (rest, start_time) = try_parse!(rest, s!(parse_u64 ));
let (rest, vsize) = try_parse!(rest, s!(parse_usize ));
let (rest, rss) = try_parse!(rest, s!(parse_usize ));
let (rest, rsslim) = try_parse!(rest, s!(parse_usize ));
let (rest, start_code) = try_parse!(rest, s!(parse_usize ));
let (rest, end_code) = try_parse!(rest, s!(parse_usize ));
let (rest, startstack) = try_parse!(rest, s!(parse_usize ));
let (rest, kstkeep) = try_parse!(rest, s!(parse_usize ));
let (rest, kstkeip) = try_parse!(rest, s!(parse_usize ));
let (rest, signal) = try_parse!(rest, s!(parse_usize ));
let (rest, blocked) = try_parse!(rest, s!(parse_usize ));
let (rest, sigignore) = try_parse!(rest, s!(parse_usize ));
let (rest, sigcatch) = try_parse!(rest, s!(parse_usize ));
let (rest, wchan) = try_parse!(rest, s!(parse_usize ));
let (rest, _nswap) = try_parse!(rest, s!(parse_usize ));
let (rest, _cnswap) = try_parse!(rest, s!(parse_usize ));
let (rest, exit_signal) = try_parse!(rest, s!(parse_i32 ));
let (rest, processor) = try_parse!(rest, s!(parse_u32 ));
let (rest, rt_priority) = try_parse!(rest, s!(parse_u32 ));
let (rest, policy) = try_parse!(rest, s!(parse_u32 ));
let (rest, delayacct_blkio_ticks) = try_parse!(rest, s!(parse_u64 ));
let (rest, guest_time) = try_parse!(rest, s!(parse_clock ));
let (rest, cguest_time) = try_parse!(rest, s!(parse_clock ));
let (rest, start_data) = try_parse!(rest, s!(parse_usize ));
let (rest, end_data) = try_parse!(rest, s!(parse_usize ));
let (rest, start_brk) = try_parse!(rest, s!(parse_usize ));
let (rest, arg_start) = try_parse!(rest, s!(parse_usize ));
let (rest, arg_end) = try_parse!(rest, s!(parse_usize ));
let (rest, env_start) = try_parse!(rest, s!(parse_usize ));
let (rest, env_end) = try_parse!(rest, s!(parse_usize ));
let (rest, exit_code) = try_parse!(rest, l!(parse_i32 ));

IResult::Done(rest, Stat {
pid : pid,
command : command,
state : state,
ppid : ppid,
pgrp : pgrp,
session : session,
tty_nr : tty_nr,
tty_pgrp : tty_pgrp,
flags : flags,
minflt : minflt,
cminflt : cminflt,
majflt : majflt,
cmajflt : cmajflt,
utime : utime,
stime : stime,
cutime : cutime,
cstime : cstime,
priority : priority,
nice : nice,
num_threads : num_threads,
start_time : start_time,
vsize : vsize,
rss : rss,
rsslim : rsslim,
start_code : start_code,
end_code : end_code,
startstack : startstack,
kstkeep : kstkeep,
kstkeip : kstkeip,
signal : signal,
blocked : blocked,
sigignore : sigignore,
sigcatch : sigcatch,
wchan : wchan,
exit_signal : exit_signal,
processor : processor,
rt_priority : rt_priority,
policy : policy,
delayacct_blkio_ticks : delayacct_blkio_ticks,
guest_time : guest_time,
cguest_time : cguest_time,
start_data : start_data,
end_data : end_data,
start_brk : start_brk,
arg_start : arg_start,
arg_end : arg_end,
env_start : env_start,
env_end : env_end,
exit_code : exit_code,
})
}

/// Parses the provided stat file.
fn stat_file(file: &mut File) -> Result<Stat> {
Expand Down