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|
use std::collections::HashSet;
use proc_macro2::Span;
use rtfm_syntax::{
analyze::Analysis,
ast::{App, CustomArg},
};
use syn::{parse, Path};
pub struct Extra<'a> {
pub device: &'a Path,
pub monotonic: Option<&'a Path>,
pub peripherals: Option<u8>,
}
impl<'a> Extra<'a> {
pub fn monotonic(&self) -> &'a Path {
self.monotonic.expect("UNREACHABLE")
}
}
pub fn app<'a>(app: &'a App, analysis: &Analysis) -> parse::Result<Extra<'a>> {
if cfg!(feature = "homogeneous") {
// this RTFM mode uses the same namespace for all cores so we need to check that the
// identifiers used for each core `#[init]` and `#[idle]` functions don't collide
let mut seen = HashSet::new();
for name in app
.inits
.values()
.map(|init| &init.name)
.chain(app.idles.values().map(|idle| &idle.name))
{
if seen.contains(name) {
return Err(parse::Error::new(
name.span(),
"this identifier is already being used by another core",
));
} else {
seen.insert(name);
}
}
}
// check that all exceptions are valid; only exceptions with configurable priorities are
// accepted
for (name, task) in &app.hardware_tasks {
let name_s = task.args.binds.to_string();
match &*name_s {
"SysTick" => {
if analysis.timer_queues.get(&task.args.core).is_some() {
return Err(parse::Error::new(
name.span(),
"this exception can't be used because it's being used by the runtime",
));
} else {
// OK
}
}
"NonMaskableInt" | "HardFault" => {
return Err(parse::Error::new(
name.span(),
"only exceptions with configurable priority can be used as hardware tasks",
));
}
_ => {}
}
}
// check that external (device-specific) interrupts are not named after known (Cortex-M)
// exceptions
for name in app
.extern_interrupts
.iter()
.flat_map(|(_, interrupts)| interrupts.keys())
{
let name_s = name.to_string();
match &*name_s {
"NonMaskableInt" | "HardFault" | "MemoryManagement" | "BusFault" | "UsageFault"
| "SecureFault" | "SVCall" | "DebugMonitor" | "PendSV" | "SysTick" => {
return Err(parse::Error::new(
name.span(),
"Cortex-M exceptions can't be used as `extern` interrupts",
));
}
_ => {}
}
}
// check that there are enough external interrupts to dispatch the software tasks and the timer
// queue handler
for core in 0..app.args.cores {
let mut first = None;
let priorities = app
.software_tasks
.iter()
.filter_map(|(name, task)| {
if task.args.core == core {
first = Some(name);
Some(task.args.priority)
} else {
None
}
})
.chain(analysis.timer_queues.get(&core).map(|tq| tq.priority))
.collect::<HashSet<_>>();
let need = priorities.len();
let given = app
.extern_interrupts
.get(&core)
.map(|ei| ei.len())
.unwrap_or(0);
if need > given {
let s = if app.args.cores == 1 {
format!(
"not enough `extern` interrupts to dispatch \
all software tasks (need: {}; given: {})",
need, given
)
} else {
format!(
"not enough `extern` interrupts to dispatch \
all software tasks on this core (need: {}; given: {})",
need, given
)
};
return Err(parse::Error::new(first.unwrap().span(), &s));
}
}
let mut device = None;
let mut monotonic = None;
let mut peripherals = None;
for (k, v) in &app.args.custom {
let ks = k.to_string();
match &*ks {
"device" => match v {
CustomArg::Path(p) => device = Some(p),
_ => {
return Err(parse::Error::new(
k.span(),
"unexpected argument value; this should be a path",
));
}
},
"monotonic" => match v {
CustomArg::Path(p) => monotonic = Some(p),
_ => {
return Err(parse::Error::new(
k.span(),
"unexpected argument value; this should be a path",
));
}
},
"peripherals" => match v {
CustomArg::Bool(x) if app.args.cores == 1 => {
peripherals = if *x { Some(0) } else { None }
}
CustomArg::UInt(s) if app.args.cores != 1 => {
let x = s.parse::<u8>().ok();
peripherals = if x.is_some() && x.unwrap() < app.args.cores {
Some(x.unwrap())
} else {
return Err(parse::Error::new(
k.span(),
&format!(
"unexpected argument value; \
this should be an integer in the range 0..={}",
app.args.cores
),
));
}
}
_ => {
return Err(parse::Error::new(
k.span(),
if app.args.cores == 1 {
"unexpected argument value; this should be a boolean"
} else {
"unexpected argument value; this should be an integer"
},
));
}
},
_ => {
return Err(parse::Error::new(k.span(), "unexpected argument"));
}
}
}
if !analysis.timer_queues.is_empty() && monotonic.is_none() {
return Err(parse::Error::new(
Span::call_site(),
"a `monotonic` timer must be specified to use the `schedule` API",
));
}
if let Some(device) = device {
Ok(Extra {
device,
monotonic,
peripherals,
})
} else {
Err(parse::Error::new(
Span::call_site(),
"a `device` argument must be specified in `#[rtfm::app]`",
))
}
}
|
