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|
use std::collections::HashSet;
use proc_macro2::Span;
use rtic_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: bool,
}
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>> {
// Check that external (device-specific) interrupts are not named after known (Cortex-M)
// exceptions
for name in app.extern_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
let mut first = None;
let priorities = app
.software_tasks
.iter()
.map(|(name, task)| {
first = Some(name);
task.args.priority
})
.collect::<HashSet<_>>();
let need = priorities.len();
let given = app.extern_interrupts.len();
if need > given {
let s = {
format!(
"not enough `extern` interrupts to dispatch \
all software tasks (need: {}; given: {})",
need, given
)
};
// If not enough tasks and first still is None, may cause
// "custom attribute panicked" due to unwrap on None
return Err(parse::Error::new(first.unwrap().span(), &s));
}
let mut device = None;
let mut monotonic = None;
let mut peripherals = false;
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) => peripherals = *x,
_ => {
return Err(parse::Error::new(
k.span(),
"unexpected argument value; this should be a boolean",
));
}
},
_ => {
return Err(parse::Error::new(k.span(), "unexpected argument"));
}
}
}
// 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 the timer queue is used, then SysTick is unavailable
if monotonic.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",
));
}
_ => {}
}
}
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 `#[rtic::app]`",
))
}
}
|
