wip coroutines and scheduler

coroutines
Ondřej Hruška 3 years ago
parent d0d4f1c15e
commit 8659240d01
Signed by: MightyPork
GPG Key ID: 2C5FD5035250423D
  1. 3
      crsn/src/asm/instr/op.rs
  2. 8
      crsn/src/asm/mod.rs
  3. 2
      crsn/src/asm/parse/parse_data.rs
  4. 9
      crsn/src/builtin/defs.rs
  5. 61
      crsn/src/builtin/exec.rs
  6. 65
      crsn/src/builtin/parse.rs
  7. 22
      crsn/src/module/eval_res.rs
  8. 2
      crsn/src/module/mod.rs
  9. 4
      crsn/src/runtime/exec.rs
  10. 3
      crsn/src/runtime/fault.rs
  11. 6
      crsn/src/runtime/frame.rs
  12. 142
      crsn/src/runtime/run_thread.rs
  13. 2
      crsn/src/runtime/run_thread/info.rs
  14. 127
      crsn/src/runtime/run_thread/state.rs
  15. 4
      launcher/src/main.rs

@ -4,7 +4,7 @@ use sexp::{Atom, Sexp, SourcePosition};
use crate::asm::instr::Cond;
use crate::builtin::defs::BuiltinOp;
use crate::module::{EvalRes, OpTrait};
use crate::module::{EvalRes, OpTrait, SchedSignal};
use crate::runtime::fault::Fault;
use crate::runtime::run_thread::{info::ThreadInfo, state::RunState};
@ -30,6 +30,7 @@ impl OpTrait for Op {
return Ok(EvalRes {
cycles: 0,
advance: 1,
sched: SchedSignal::Normal
});
}
}

@ -42,6 +42,7 @@ pub fn assemble(source: &str, uniq : &CrsnUniq, mut parsers: Vec<Box<dyn CrsnExt
uniq: Default::default(),
program: Program::new(vec![], parsers_arc.clone()).unwrap(),
cycle_time: Default::default(),
scheduler_interval: Default::default(),
extensions: parsers_arc.clone(),
});
@ -57,10 +58,11 @@ pub fn assemble(source: &str, uniq : &CrsnUniq, mut parsers: Vec<Box<dyn CrsnExt
// This allows to evaluate nearly all instructions at compile time.
const_eval: RunState {
thread_info: ti.clone(),
frame: Default::default(),
call_stack: vec![],
cr: Default::default(),
parked: Default::default(),
global_regs: [0; REG_COUNT],
ext_data: Default::default()
ext_data: Default::default(),
cr_deadline: None
},
const_eval_ti: ti,
parsing_expr: false

@ -139,7 +139,7 @@ pub fn parse_data_disp(tok: Sexp, pcx: &ParserContext) -> Result<DataDisp, CrsnE
state_mut.parsing_expr = false;
}
return Ok(DataDisp::Immediate(state_mut.const_eval.frame.gen[0]));
return Ok(DataDisp::Immediate(state_mut.const_eval.cr.frame.gen[0]));
}
Err(CrsnError::Parse("List not expected here".into(), pos))

@ -136,7 +136,9 @@ pub enum BuiltinOp {
FarJump(Label),
/// Call a routine with arguments.
/// The arguments are passed as argX. Return values are stored in resX registers.
Call(RoutineName, Vec<Rd>),
Call { proc: RoutineName, args: Vec<Rd> },
/// Spawn a coroutine. The invocation is similar to (call).
Spawn { handle: Wr, proc: RoutineName, args: Vec<Rd> },
/// Exit the current routine with return values
Ret(Vec<Rd>),
/// Mark a routine entry point (call target).
@ -144,6 +146,11 @@ pub enum BuiltinOp {
Routine(RoutineName),
/// Skip backward or forward. The skip count can be defined by an argument.
Skip(Rd),
/// Join a coroutine
Join(RdObj),
/// Yield control, optionally yielding a value that must be consumed (by reading the task handle)
/// before execution can resume
Yield { value: Option<Rd> },
/// Deny jumps, skips and run across this address, producing a run-time fault.
Barrier {
kind: Barrier,

@ -4,7 +4,7 @@ use sexp::Sexp;
use crate::asm::data::literal::{Addr, Value};
use crate::builtin::defs::{Barrier, BuiltinOp, LdsValue};
use crate::module::{EvalRes, OpTrait};
use crate::module::{EvalRes, OpTrait, SchedSignal};
use crate::runtime::fault::Fault;
use crate::runtime::frame::StackFrame;
use crate::runtime::run_thread::{state::RunState, ThreadInfo};
@ -63,7 +63,7 @@ impl OpTrait for BuiltinOp {
BuiltinOp::Jump(_name) => {
panic!("jump not translated to skip by assembler!");
}
BuiltinOp::Call(name, args) => {
BuiltinOp::Call { proc: name, args } => {
match program.find_routine(&name) {
Ok(pos) => {
let mut values = Vec::with_capacity(args.len());
@ -72,8 +72,8 @@ impl OpTrait for BuiltinOp {
}
let mut frame2 = StackFrame::new(pos, &values);
std::mem::swap(&mut state.frame, &mut frame2);
state.call_stack.push(frame2);
std::mem::swap(&mut state.cr.frame, &mut frame2);
state.cr.call_stack.push(frame2);
res.advance = 0;
}
Err(e) => {
@ -81,18 +81,40 @@ impl OpTrait for BuiltinOp {
}
}
}
BuiltinOp::Ret(retvals) => {
match state.call_stack.pop() {
Some(previous) => {
let mut values = Vec::with_capacity(retvals.len());
for arg in retvals {
BuiltinOp::Spawn { handle, proc, args } => {
match program.find_routine(&proc) {
Ok(pos) => {
let mut values = Vec::with_capacity(args.len());
for arg in args {
values.push(state.read(arg)?);
}
state.frame = previous;
state.frame.set_retvals(&values);
let mut frame2 = StackFrame::new(pos, &values);
let handle_val = state.add_coroutine(frame2);
state.write(handle, handle_val)?;
// Yield execution so the new thread can start running
res.sched = SchedSignal::Yield(None);
}
Err(e) => {
return Err(e);
}
}
}
BuiltinOp::Ret(retvals) => {
let mut values = Vec::with_capacity(retvals.len());
for arg in retvals {
values.push(state.read(arg)?);
}
match state.cr.call_stack.pop() {
Some(previous) => {
state.cr.frame = previous;
state.cr.frame.set_retvals(&values);
}
None => {
return Err(Fault::CallStackUnderflow);
// Stack underflow - if this is a coroutine, it's finished
res.sched = SchedSignal::Ret(values);
}
}
}
@ -196,15 +218,15 @@ impl OpTrait for BuiltinOp {
}
}
BuiltinOp::StoreFlags { dst } => {
let packed = state.frame.status.store();
let packed = state.cr.frame.status.store();
state.write(dst, packed)?;
}
BuiltinOp::LoadFlags { src } => {
let x = state.read(src)?;
state.frame.status.load(x);
state.cr.frame.status.load(x);
}
BuiltinOp::Sleep { count: micros, unit_us } => {
std::thread::sleep(Duration::from_micros(state.read(micros)? * unit_us.micros()))
res.sched = SchedSignal::Sleep(Duration::from_micros(state.read(micros)? * unit_us.micros()));
}
BuiltinOp::Delete(obj) => {
let hv = obj.read(state)?;
@ -221,6 +243,15 @@ impl OpTrait for BuiltinOp {
state.set_flag(Flag::Invalid, true);
}
}
BuiltinOp::Yield { value } => {
res.sched = SchedSignal::Yield(match value {
None => None,
Some(rd) => Some(state.read(rd)?)
});
}
BuiltinOp::Join(obj) => {
res.sched = SchedSignal::Join(obj.read(state)?);
}
}
Ok(res)

@ -1,4 +1,4 @@
use sexp::{Atom, Sexp, SourcePosition, atom_qs};
use sexp::{Atom, Sexp, SourcePosition, atom_qs, atom_s};
use crate::asm::data::literal::{RoutineName};
use crate::asm::data::reg::parse_reg;
@ -25,21 +25,21 @@ pub(crate) fn parse_op<'a>(op_pos: &SourcePosition, keyword: &str, mut args: Tok
BuiltinOp::Halt
}
"uslp" => {
"uslp" | "usleep" => {
BuiltinOp::Sleep {
count: args.next_rd()?,
unit_us: SleepUnit::Usec,
}
}
"mslp" => {
"mslp" | "msleep" => {
BuiltinOp::Sleep {
count: args.next_rd()?,
unit_us: SleepUnit::Msec,
}
}
"sslp" => {
"sslp" | "ssleep" => {
BuiltinOp::Sleep {
count: args.next_rd()?,
unit_us: SleepUnit::Sec,
@ -132,7 +132,7 @@ pub(crate) fn parse_op<'a>(op_pos: &SourcePosition, keyword: &str, mut args: Tok
for t in args {
call_args.push(parse_rd(t, pcx)?);
}
BuiltinOp::Call(dest, call_args)
BuiltinOp::Call { proc: dest, args: call_args }
}
"ret" => {
@ -258,6 +258,38 @@ pub(crate) fn parse_op<'a>(op_pos: &SourcePosition, keyword: &str, mut args: Tok
}
}
"spawn" => {
let handle = args.next_wr()?;
let dest = RoutineName { name: args.next_string()?.0, arity: args.len() as u8 };
let mut call_args = vec![];
for t in args {
call_args.push(parse_rd(t, pcx)?);
}
BuiltinOp::Spawn {
handle,
proc: dest,
args: call_args
}
}
"join" => {
BuiltinOp::Join(args.next_rdobj()?)
}
"yield" => {
if args.have_more() {
BuiltinOp::Yield {
value: Some(args.next_rd()?),
}
} else {
BuiltinOp::Yield {
value: None,
}
}
}
"del" => {
BuiltinOp::Delete(args.next_rdobj()?)
}
@ -326,7 +358,7 @@ pub(crate) fn to_sexp(op: &BuiltinOp) -> Sexp {
BuiltinOp::Jump(label) => sexp::list(&[A("j"), A(label)]),
BuiltinOp::FarLabel(label) => sexp::list(&[A("far"), A(label)]),
BuiltinOp::FarJump(label) => sexp::list(&[A("fj"), A(label)]),
BuiltinOp::Call(name, args) => {
BuiltinOp::Call { proc: name, args } => {
if args.is_empty() {
sexp::list(&[A("call"), A(&name.name)])
} else {
@ -416,6 +448,22 @@ pub(crate) fn to_sexp(op: &BuiltinOp) -> Sexp {
}
}
}
BuiltinOp::Spawn { handle, proc, args } => {
if args.is_empty() {
sexp::list(&[A("spawn"), A(handle), A(proc)])
} else {
let mut v = vec![A("spawn"), A(handle), A(proc)];
v.extend(args.iter().map(|r| A(r)));
sexp::list(&v)
}
}
BuiltinOp::Join(handle) => sexp::list(&[A("join"), A(handle)]),
BuiltinOp::Yield { value } => {
match value {
None => sexp::list(&[A("yield")]),
Some(rd) => sexp::list(&[A("yield"), A(rd)]),
}
}
}
}
@ -505,6 +553,11 @@ mod test {
("(far :label)", "(far :label)"),
("(del @r5)", "(del @r5)"),
("(sym cat r0)(del @cat)", "(del @r0)"),
("(spawn r0 foo 1 2 3)", "(spawn r0 foo 1 2 3)"),
("(yield)", "(yield)"),
("(yield -1)", "(yield -1)"),
("(yield r5)", "(yield r5)"),
("(join @r5)", "(join @r5)"),
];
let parser = BuiltinOps::new();

@ -1,3 +1,6 @@
use crate::asm::data::literal::Value;
use std::time::Duration;
/// Cycles spent executing an instruction
pub type CyclesSpent = usize;
@ -6,6 +9,7 @@ pub type CyclesSpent = usize;
pub struct EvalRes {
pub cycles: CyclesSpent,
pub advance: i64,
pub sched: SchedSignal,
}
impl Default for EvalRes {
@ -13,6 +17,24 @@ impl Default for EvalRes {
Self {
cycles: 1,
advance: 1,
sched: SchedSignal::Normal,
}
}
}
/// Signal to the scheduler
#[derive(Debug)]
pub enum SchedSignal {
/// No signal, execution went normally.
Normal,
/// Yield control, optionally with a value.
/// If a value is yielded, it must be consumed through the handle before execution can resume.
Yield(Option<Value>),
/// The routine requests a delay in execution. The actual sleep time can be longer due to task
/// switching overhead.
Sleep(Duration),
/// Return from a coroutine - the thread ends and should be joined.
Ret(Vec<Value>),
/// Request to join a coroutine/thread
Join(Value),
}

@ -2,7 +2,7 @@
use std::fmt::Debug;
pub use eval_res::EvalRes;
pub use eval_res::*;
use sexp::{Sexp, SourcePosition};
use crate::asm::data::literal::Value;

@ -8,9 +8,9 @@ impl RunThread {
let state = &mut self.state;
let info = &self.info;
let op = info.program.fetch_instr(state.frame.pc);
let op = info.program.fetch_instr(state.cr.frame.pc);
trace!("### {:04} : {:?}", state.frame.pc.0, op);
trace!("### {:04} : {:?}", state.cr.frame.pc.0, op);
op.execute(info, state)
}

@ -26,6 +26,9 @@ pub enum Fault {
#[error("Program ended.")]
Halt,
#[error("Instruction did not finish in time for context switch, retry later")]
Blocked,
#[error("Operation not allowed: {0}")]
NotAllowed(Cow<'static, str>),

@ -33,10 +33,14 @@ impl StackFrame {
sf
}
#[inline(always)]
pub fn set_retvals(&mut self, vals: &[Value]) {
for n in 0..(vals.len().min(REG_COUNT)) {
self.res[n] = vals[n];
}
// Zero the rest
for n in vals.len()..REG_COUNT {
self.res[n] = 0;
}
}
}

@ -1,16 +1,19 @@
use std::sync::Arc;
use std::thread::JoinHandle;
use std::time::{Duration};
use std::time::{Duration, Instant};
pub use info::ThreadInfo;
pub use state::RunState;
use crate::asm::data::literal::Addr;
use crate::module::{EvalRes, CrsnUniq};
use crate::module::{EvalRes, CrsnUniq, SchedSignal};
use crate::runtime::fault::Fault;
use crate::runtime::frame::{StackFrame, REG_COUNT};
use crate::runtime::program::Program;
use crate::runtime::run_thread::state::{CoroutineContext, CoroutineState};
use std::{mem, thread};
use crate::asm::instr::cond::Flag;
#[derive(Clone, Copy, Eq, PartialEq, Debug, Ord, PartialOrd)]
pub struct ThreadToken(pub u32);
@ -29,6 +32,7 @@ pub struct ThreadParams<'a> {
pub program: Arc<Program>,
pub pc: Addr,
pub cycle_time: Duration,
pub scheduler_interval: Duration,
pub args: &'a [u64],
}
@ -41,15 +45,22 @@ impl RunThread {
uniq: params.uniq,
program: params.program,
cycle_time: params.cycle_time,
scheduler_interval: params.scheduler_interval,
extensions,
});
let rs = RunState {
thread_info: ti.clone(),
frame: StackFrame::new(params.pc, params.args),
call_stack: vec![],
cr: CoroutineContext {
handle: 0, // this is the root
frame: StackFrame::new(params.pc, params.args),
call_stack: vec![],
cr_state: Default::default(),
},
parked: Default::default(),
global_regs: [0; REG_COUNT],
ext_data: Default::default(),
cr_deadline: None
};
Self {
@ -72,14 +83,69 @@ impl RunThread {
loop_helper.loop_start();
'run: loop {
let mut want_switch = false;
match self.eval_op() {
Ok(EvalRes { cycles, advance }) => {
Ok(EvalRes { cycles, advance, sched }) => {
for _ in 0..cycles {
loop_helper.loop_sleep();
loop_helper.loop_start();
}
trace!("Step {}; Status = {}", advance, self.state.frame.status);
self.state.frame.pc.advance(advance);
trace!("Step {}; Status = {}", advance, self.state.cr.frame.status);
self.state.cr.frame.pc.advance(advance);
if let Some(dl) = self.state.cr_deadline {
want_switch = dl <= Instant::now();
}
match sched {
SchedSignal::Normal => {}
SchedSignal::Yield(None) => {
self.state.cr.cr_state = CoroutineState::Ready;
want_switch = true;
}
SchedSignal::Yield(Some(value)) => {
self.state.cr.cr_state = CoroutineState::YieldedValue(value);
want_switch = true;
}
SchedSignal::Sleep(time) => {
self.state.cr.cr_state = CoroutineState::Sleep { due: Instant::now() + time };
want_switch = true;
}
SchedSignal::Ret(results) => {
self.state.cr.cr_state = CoroutineState::Finished(results);
want_switch = true;
// TODO prioritize a thread that is waiting for this return value
}
SchedSignal::Join(handle) => {
let mut found = false;
'find: for (n, th) in self.state.parked.iter_mut().enumerate() {
if th.handle == handle {
if let CoroutineState::Finished(_) = &th.cr_state {
let mut crs = mem::replace(&mut th.cr_state, CoroutineState::Ready);
self.state.parked.remove(n); // delete it
if let CoroutineState::Finished(vals) = crs {
self.state.cr.frame.set_retvals(&vals);
found = true;
break 'find;
} else {
unreachable!();
}
}
}
}
if !found {
self.state.set_flag(Flag::Invalid, true);
warn!("Join with invalid thread handle!");
self.state.cr.frame.set_retvals(&[]);
}
}
}
}
Err(Fault::Blocked) => {
// Do not advance, the last instruction will be re-tried
want_switch = true;
}
Err(Fault::Halt) => {
// TODO implement coordinated shutdown when more threads are running!
@ -91,6 +157,68 @@ impl RunThread {
break 'run;
}
}
if want_switch {
trace!("Switch requested");
let now = Instant::now();
let mut candidate = None;
let mut closest_due = None;
for _ in 0..self.state.parked.len() {
if let Some(mut rt) = self.state.parked.pop_front() {
match rt.cr_state {
CoroutineState::Ready => {
candidate = Some(rt);
break;
}
CoroutineState::Sleep { due } => {
if due <= now {
rt.cr_state = CoroutineState::Ready;
candidate = Some(rt);
break;
} else {
match closest_due {
Some(d) => {
if d > due {
closest_due = Some(due);
}
},
None => {
closest_due = Some(due);
}
}
self.state.parked.push_back(rt);
}
}
_ => {
self.state.parked.push_back(rt);
}
}
}
}
if let Some(cr) = candidate {
trace!("Context switch to {:?}", cr);
// Do switch
let old = mem::replace(&mut self.state.cr, cr);
self.state.parked.push_back(old);
self.state.cr_deadline = Some(now + self.info.scheduler_interval);
} else if let Some(due) = closest_due {
let time = due.saturating_duration_since(now);
trace!("No thread to switch to, sleep {:?}", time);
thread::sleep(time);
}
let n_alive = self.state.parked.iter()
.filter(|p| p.cr_state.is_alive()).count();
if n_alive <= 1 {
trace!("Stop task switching, no parked threads are alive");
self.state.cr_deadline = None;
}
}
}
debug!("Thread ended.");

@ -17,6 +17,8 @@ pub struct ThreadInfo {
pub program: Arc<Program>,
/// Program to run
pub(crate) cycle_time: Duration,
/// Interval one thread/coroutine is let to run before the context switches
pub(crate) scheduler_interval: Duration,
/// Extensions
pub extensions: Arc<Vec<Box<dyn CrsnExtension>>>,
}

@ -1,5 +1,5 @@
use std::any::{Any, TypeId};
use std::collections::HashMap;
use std::collections::{HashMap, VecDeque};
use crate::asm::data::{Rd, RdData, RdObj, Register, Wr, WrData};
use crate::asm::data::literal::{Addr, Value};
@ -12,34 +12,95 @@ use nudge::{likely};
use crate::asm::instr::cond::Flag;
use std::fmt::{Debug, Formatter};
use std::fmt;
use std::time::Instant;
pub struct RunState {
pub thread_info: Arc<ThreadInfo>,
/// Active stack frame
pub frame: StackFrame,
/// Call stack
pub call_stack: CallStack,
/// The active coroutine
pub cr: CoroutineContext,
/// Parked coroutines
pub parked: VecDeque<CoroutineContext>,
/// General purpose registers that stay valid for the entire run-time of the thread
pub global_regs: [Value; REG_COUNT],
/// Extension data
pub ext_data: ExtensionDataStore,
/// Execution deadline, if multi-tasked
pub cr_deadline: Option<Instant>,
}
#[derive(Debug,Default)]
pub struct CoroutineContext {
pub handle: Value,
/// Active stack frame
pub frame: StackFrame,
/// Call stack
pub call_stack: CallStack,
/// Coroutine run state
pub cr_state: CoroutineState,
}
/// Execution state of an inactive coroutine
#[derive(Debug, Eq, PartialEq)]
pub enum CoroutineState {
/// Ready to run, just started, or interrupted by the scheduler
Ready,
/// Delay in progress
Sleep { due: Instant },
/// The task finished
Finished(Vec<Value>),
/// The task yielded a value that must be consumed before it can resume.
/// State switches to Ready when the value is read.
YieldedValue(Value),
}
impl CoroutineState {
pub fn is_alive(&self) -> bool {
match self {
CoroutineState::Ready => true,
CoroutineState::Sleep { .. } => true,
CoroutineState::Finished(_) => false,
CoroutineState::YieldedValue(_) => true,
}
}
}
impl Default for CoroutineState {
fn default() -> Self {
Self::Ready
}
}
impl RunState {
/// Clear everything. Caution: when done at runtime, this effectively reboots the thread
pub fn clear_all(&mut self) {
self.frame = Default::default();
self.call_stack = Default::default();
self.cr = Default::default();
self.parked = Default::default();
self.global_regs = Default::default();
self.ext_data = Default::default();
}
/// Add a coroutine, marked as Ready, to run next
pub fn add_coroutine(&mut self, frame : StackFrame) -> Value {
let handle = self.thread_info.unique_handle();
self.parked.push_back(CoroutineContext {
handle,
frame,
call_stack: vec![],
cr_state: Default::default()
});
if self.cr_deadline.is_none() {
// start context switching
self.cr_deadline = Some(Instant::now() + self.thread_info.scheduler_interval);
}
handle
}
}
impl Debug for RunState {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("RunState")
.field("frame", &self.frame)
.field("call_stack", &self.call_stack)
.field("cr", &self.cr)
.field("parked", &self.parked)
.field("global_regs", &self.global_regs)
//.field("ext_data", &self.ext_data)
.finish()
@ -79,44 +140,44 @@ impl RunState {
#[inline(always)]
pub fn set_flag(&mut self, flag: Flag, set: bool) {
trace!("Flag {} = {:?}", flag, set);
self.frame.status.set(flag, set);
self.cr.frame.status.set(flag, set);
}
/// Check status flags for a condition
#[inline(always)]
pub fn test_cond(&self, cond: Cond) -> bool {
self.frame.status.test(cond)
self.cr.frame.status.test(cond)
}
/// Set program counter - address of the next instruction to run
pub fn set_pc(&mut self, pc: Addr) {
trace!("PC := {}", pc);
self.frame.pc = pc;
self.cr.frame.pc = pc;
}
/// Get program counter - address of the next instruction to run
pub fn get_pc(&self) -> Addr {
self.frame.pc
self.cr.frame.pc
}
/// Clear status flags
#[inline(always)]
pub fn clear_status(&mut self) {
self.frame.status.clear();
self.cr.frame.status.clear();
}
/// Update status flags using a variable.
/// The update is additive - call `clear_status()` first if desired!
#[inline(always)]
pub fn update_status(&mut self, val: Value) {
self.frame.status.update(val);
self.cr.frame.status.update(val);
}
/// Update status flags using a variable.
/// The update is additive - call `clear_status()` first if desired!
#[inline(always)]
pub fn update_status_float(&mut self, val: f64) {
self.frame.status.update_float(val);
self.cr.frame.status.update_float(val);
}
/// Read object handle value
@ -133,8 +194,8 @@ impl RunState {
RdData::Immediate(v) => Ok(v),
RdData::Register(Register::Gen(rn)) => {
if likely(rn < REG_COUNT as u8) {
trace!("Rd {:?} = {}", rd, self.frame.gen[rn as usize]);
Ok(self.frame.gen[rn as usize])
trace!("Rd {:?} = {}", rd, self.cr.frame.gen[rn as usize]);
Ok(self.cr.frame.gen[rn as usize])
} else {
Err(Fault::RegisterNotExist { reg: Register::Gen(rn) })
}
@ -149,16 +210,16 @@ impl RunState {
}
RdData::Register(Register::Arg(rn)) => {
if likely(rn < REG_COUNT as u8) {
trace!("Rd {:?} = {}", rd, self.frame.arg[rn as usize]);
Ok(self.frame.arg[rn as usize])
trace!("Rd {:?} = {}", rd, self.cr.frame.arg[rn as usize]);
Ok(self.cr.frame.arg[rn as usize])
} else {
Err(Fault::RegisterNotExist { reg: Register::Arg(rn) })
}
}
RdData::Register(Register::Res(rn)) => {
if likely(rn < REG_COUNT as u8) {
trace!("Rd {:?} = {}", rd, self.frame.res[rn as usize]);
Ok(self.frame.res[rn as usize])
trace!("Rd {:?} = {}", rd, self.cr.frame.res[rn as usize]);
Ok(self.cr.frame.res[rn as usize])
} else {
Err(Fault::RegisterNotExist { reg: Register::Res(rn) }) // TODO use match after @ when stabilized https://github.com/rust-lang/rust/issues/65490
}
@ -174,6 +235,26 @@ impl RunState {
}
fn read_object(&mut self, reference: Value) -> Result<Value, Fault> {
// values yielded from coroutines
for cr in &mut self.parked {
if cr.handle == reference {
match cr.cr_state {
CoroutineState::Ready | CoroutineState::Sleep { .. } => {
return Err(Fault::Blocked);
}
CoroutineState::Finished(_) => {
self.set_flag(Flag::Eof, true);
warn!("Attempt to read yielded value of a finished coroutine");
return Ok(0);
}
CoroutineState::YieldedValue(v) => {
cr.cr_state = CoroutineState::Ready;
return Ok(v);
}
}
}
}
// This is a shitty dirty hack to allow iterating over the extensions while passing a mutable reference
// to self to the reading methods. Since the extensions array is in an Arc, it can't be mutated internally
// anyway, and we know it will still live after the method returns - unless someone does something incredibly stupid.
@ -213,7 +294,7 @@ impl RunState {
match wr.0 {
WrData::Register(Register::Gen(rn)) => {
if likely(rn < REG_COUNT as u8) {
self.frame.gen[rn as usize] = val;
self.cr.frame.gen[rn as usize] = val;
Ok(())
} else {
Err(Fault::RegisterNotExist { reg: Register::Gen(rn) })

@ -38,6 +38,8 @@ struct Config {
assemble_debug: bool,
#[serde(with = "serde_duration_millis")]
cycle_time: Duration,
#[serde(with = "serde_duration_millis")]
switch_time: Duration,
}
impl Default for Config {
@ -51,6 +53,7 @@ impl Default for Config {
assemble_only: false,
assemble_debug: false,
cycle_time: Duration::default(),
switch_time: Duration::from_millis(10),
}
}
}
@ -177,6 +180,7 @@ fn main() -> anyhow::Result<()> {
program: parsed,
pc: Addr(0),
cycle_time: config.cycle_time,
scheduler_interval: config.switch_time,
args
});

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