wasmer/lib/emscripten/src/time.rs
2019-01-18 00:33:46 -06:00

285 lines
9.3 KiB
Rust

use super::utils::{copy_cstr_into_wasm, write_to_buf};
use libc::{c_char, c_int, time as libc_time, time_t};
use std::mem;
use std::time::SystemTime;
use time;
use super::env;
use wasmer_runtime::Instance;
#[cfg(target_os = "linux")]
use libc::{CLOCK_MONOTONIC, CLOCK_MONOTONIC_COARSE, CLOCK_REALTIME};
#[cfg(target_os = "macos")]
use libc::{CLOCK_MONOTONIC, CLOCK_REALTIME};
#[cfg(target_os = "macos")]
const CLOCK_MONOTONIC_COARSE: libc::clockid_t = 6;
// some assumptions about the constants when targeting windows
#[cfg(target_os = "windows")]
const CLOCK_REALTIME: libc::clockid_t = 0;
#[cfg(target_os = "windows")]
const CLOCK_MONOTONIC: libc::clockid_t = 1;
#[cfg(target_os = "windows")]
const CLOCK_MONOTONIC_COARSE: libc::clockid_t = 6;
/// emscripten: _gettimeofday
#[allow(clippy::cast_ptr_alignment)]
pub extern "C" fn _gettimeofday(tp: c_int, tz: c_int, instance: &mut Instance) -> c_int {
debug!("emscripten::_gettimeofday {} {}", tp, tz);
#[repr(C)]
struct GuestTimeVal {
tv_sec: i32,
tv_usec: i32,
}
assert!(
tz == 0,
"the timezone argument of `_gettimeofday` must be null"
);
unsafe {
let now = SystemTime::now();
let since_epoch = now.duration_since(SystemTime::UNIX_EPOCH).unwrap();
let timeval_struct_ptr = instance.memory_offset_addr(0, tp as _) as *mut GuestTimeVal;
(*timeval_struct_ptr).tv_sec = since_epoch.as_secs() as _;
(*timeval_struct_ptr).tv_usec = since_epoch.subsec_nanos() as _;
}
0
}
/// emscripten: _clock_gettime
#[allow(clippy::cast_ptr_alignment)]
pub extern "C" fn _clock_gettime(
clk_id: libc::clockid_t,
tp: c_int,
instance: &mut Instance,
) -> c_int {
debug!("emscripten::_clock_gettime {} {}", clk_id, tp);
#[repr(C)]
struct GuestTimeSpec {
tv_sec: i32,
tv_nsec: i32,
}
let timespec = match clk_id {
CLOCK_REALTIME => time::get_time(),
CLOCK_MONOTONIC | CLOCK_MONOTONIC_COARSE => {
let precise_ns = time::precise_time_ns();
time::Timespec::new(
(precise_ns / 1000000000) as i64,
(precise_ns % 1000000000) as i32,
)
}
_ => panic!("Clock with id \"{}\" is not supported.", clk_id),
};
unsafe {
let timespec_struct_ptr = instance.memory_offset_addr(0, tp as _) as *mut GuestTimeSpec;
(*timespec_struct_ptr).tv_sec = timespec.sec as _;
(*timespec_struct_ptr).tv_nsec = timespec.nsec as _;
}
0
}
/// emscripten: ___clock_gettime
pub extern "C" fn ___clock_gettime(
clk_id: libc::clockid_t,
tp: c_int,
instance: &mut Instance,
) -> c_int {
debug!("emscripten::___clock_gettime {} {}", clk_id, tp);
_clock_gettime(clk_id, tp, instance)
}
/// emscripten: _clock
pub extern "C" fn _clock() -> c_int {
debug!("emscripten::_clock");
0 // TODO: unimplemented
}
/// emscripten: _difftime
pub extern "C" fn _difftime(t0: u32, t1: u32) -> c_int {
debug!("emscripten::_difftime");
(t0 - t1) as _
}
#[repr(C)]
struct guest_tm {
pub tm_sec: c_int, // 0
pub tm_min: c_int, // 4
pub tm_hour: c_int, // 8
pub tm_mday: c_int, // 12
pub tm_mon: c_int, // 16
pub tm_year: c_int, // 20
pub tm_wday: c_int, // 24
pub tm_yday: c_int, // 28
pub tm_isdst: c_int, // 32
pub tm_gmtoff: c_int, // 36
pub tm_zone: c_int, // 40
}
/// emscripten: _tvset
pub extern "C" fn _tvset() {
debug!("emscripten::_tvset UNIMPLEMENTED");
}
/// formats time as a C string
#[allow(clippy::cast_ptr_alignment)]
unsafe extern "C" fn fmt_time(time: u32, instance: &Instance) -> *const c_char {
let date = &*(instance.memory_offset_addr(0, time as _) as *mut guest_tm);
let days = vec!["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
let months = vec![
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
];
let year = 1900 + date.tm_year;
let time_str = format!(
// NOTE: TODO: Hack! The 14 accompanying chars are needed for some reason
"{} {} {:2} {:02}:{:02}:{:02} {:4}\n\0\0\0\0\0\0\0\0\0\0\0\0\0",
days[date.tm_wday as usize],
months[date.tm_mon as usize],
date.tm_mday,
date.tm_hour,
date.tm_min,
date.tm_sec,
year
);
time_str[0..26].as_ptr() as _
}
/// emscripten: _asctime
pub extern "C" fn _asctime(time: u32, instance: &mut Instance) -> u32 {
debug!("emscripten::_asctime {}", time);
unsafe {
let time_str_ptr = fmt_time(time, instance);
copy_cstr_into_wasm(instance, time_str_ptr)
// let c_str = instance.memory_offset_addr(0, res as _) as *mut i8;
// use std::ffi::CStr;
// debug!("#### cstr = {:?}", CStr::from_ptr(c_str));
}
}
/// emscripten: _asctime_r
pub extern "C" fn _asctime_r(time: u32, buf: u32, instance: &mut Instance) -> u32 {
debug!("emscripten::_asctime_r {}, {}", time, buf);
unsafe {
// NOTE: asctime_r is specced to behave in an undefined manner if the algorithm would attempt
// to write out more than 26 bytes (including the null terminator).
// See http://pubs.opengroup.org/onlinepubs/9699919799/functions/asctime.html
// Our undefined behavior is to truncate the write to at most 26 bytes, including null terminator.
let time_str_ptr = fmt_time(time, instance);
write_to_buf(time_str_ptr, buf, 26, instance)
// let c_str = instance.memory_offset_addr(0, res as _) as *mut i8;
// use std::ffi::CStr;
// debug!("#### cstr = {:?}", CStr::from_ptr(c_str));
}
}
/// emscripten: _localtime
#[allow(clippy::cast_ptr_alignment)]
pub extern "C" fn _localtime(time_p: u32, instance: &mut Instance) -> c_int {
debug!("emscripten::_localtime {}", time_p);
// NOTE: emscripten seems to want tzset() called in this function
// https://stackoverflow.com/questions/19170721/real-time-awareness-of-timezone-change-in-localtime-vs-localtime-r
let timespec = unsafe {
let time_p_addr = instance.memory_offset_addr(0, time_p as _) as *mut i64;
let seconds = *time_p_addr.clone();
time::Timespec::new(seconds, 0)
};
let result_tm = time::at(timespec);
unsafe {
let tm_struct_offset = env::call_malloc(mem::size_of::<guest_tm>() as _, instance);
let tm_struct_ptr = instance.memory_offset_addr(0, tm_struct_offset as _) as *mut guest_tm;
// debug!(
// ">>>>>>> time = {}, {}, {}, {}, {}, {}, {}, {}",
// result_tm.tm_sec, result_tm.tm_min, result_tm.tm_hour, result_tm.tm_mday,
// result_tm.tm_mon, result_tm.tm_year, result_tm.tm_wday, result_tm.tm_yday,
// );
(*tm_struct_ptr).tm_sec = result_tm.tm_sec;
(*tm_struct_ptr).tm_min = result_tm.tm_min;
(*tm_struct_ptr).tm_hour = result_tm.tm_hour;
(*tm_struct_ptr).tm_mday = result_tm.tm_mday;
(*tm_struct_ptr).tm_mon = result_tm.tm_mon;
(*tm_struct_ptr).tm_year = result_tm.tm_year;
(*tm_struct_ptr).tm_wday = result_tm.tm_wday;
(*tm_struct_ptr).tm_yday = result_tm.tm_yday;
(*tm_struct_ptr).tm_isdst = result_tm.tm_isdst;
(*tm_struct_ptr).tm_gmtoff = 0;
(*tm_struct_ptr).tm_zone = 0;
tm_struct_offset as _
}
}
/// emscripten: _localtime_r
#[allow(clippy::cast_ptr_alignment)]
pub extern "C" fn _localtime_r(time_p: u32, result: u32, instance: &mut Instance) -> c_int {
debug!("emscripten::_localtime_r {}", time_p);
// NOTE: emscripten seems to want tzset() called in this function
// https://stackoverflow.com/questions/19170721/real-time-awareness-of-timezone-change-in-localtime-vs-localtime-r
unsafe {
let seconds = instance.memory_offset_addr(0, time_p as _) as *const i32;
let timespec = time::Timespec::new(*seconds as _, 0);
let result_tm = time::at(timespec);
// debug!(
// ">>>>>>> time = {}, {}, {}, {}, {}, {}, {}, {}",
// result_tm.tm_sec, result_tm.tm_min, result_tm.tm_hour, result_tm.tm_mday,
// result_tm.tm_mon, result_tm.tm_year, result_tm.tm_wday, result_tm.tm_yday,
// );
let result_addr = instance.memory_offset_addr(0, result as _) as *mut guest_tm;
(*result_addr).tm_sec = result_tm.tm_sec;
(*result_addr).tm_min = result_tm.tm_min;
(*result_addr).tm_hour = result_tm.tm_hour;
(*result_addr).tm_mday = result_tm.tm_mday;
(*result_addr).tm_mon = result_tm.tm_mon;
(*result_addr).tm_year = result_tm.tm_year;
(*result_addr).tm_wday = result_tm.tm_wday;
(*result_addr).tm_yday = result_tm.tm_yday;
(*result_addr).tm_isdst = result_tm.tm_isdst;
(*result_addr).tm_gmtoff = 0;
(*result_addr).tm_zone = 0;
result as _
}
}
/// emscripten: _time
#[allow(clippy::cast_ptr_alignment)]
pub extern "C" fn _time(time_p: u32, instance: &mut Instance) -> time_t {
debug!("emscripten::_time {}", time_p);
unsafe {
let time_p_addr = instance.memory_offset_addr(0, time_p as _) as *mut i64;
libc_time(time_p_addr)
}
}
/// emscripten: _strftime
pub extern "C" fn _strftime(
s_ptr: c_int,
maxsize: u32,
format_ptr: c_int,
tm_ptr: c_int,
_instance: &mut Instance,
) -> time_t {
debug!(
"emscripten::_strftime {} {} {} {}",
s_ptr, maxsize, format_ptr, tm_ptr
);
0
}