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use std::collections::{BTreeMap, HashSet};
use indexmap::map::Entry;
use proc_macro2::TokenStream as TokenStream2;
use syn::{
parse::{self, ParseStream, Parser},
spanned::Spanned,
ExprParen, Fields, ForeignItem, Ident, Item, LitBool, LitInt, Path, Token, Visibility,
};
use super::Input;
use crate::{
ast::{
App, AppArgs, CustomArg, ExternInterrupt, ExternInterrupts, HardwareTask, Idle, IdleArgs,
Init, InitArgs, LateResource, Resource, SoftwareTask,
},
parse::util,
Either, Map, Settings,
};
impl AppArgs {
pub(crate) fn parse(tokens: TokenStream2, settings: &Settings) -> parse::Result<Self> {
(|input: ParseStream<'_>| -> parse::Result<Self> {
let mut cores = None;
let mut custom = Map::new();
loop {
if input.is_empty() {
break;
}
// #ident = ..
let ident: Ident = input.parse()?;
let _eq_token: Token![=] = input.parse()?;
let ident_s = ident.to_string();
match &*ident_s {
"cores" if settings.parse_cores => {
if cores.is_some() {
return Err(parse::Error::new(
ident.span(),
"argument appears more than once",
));
}
let lit = input.parse::<LitInt>()?;
if !lit.suffix().is_empty() {
return Err(parse::Error::new(
lit.span(),
"this integer must be unsuffixed",
));
}
let val = lit.base10_parse::<u8>().ok();
if val.is_none() || val.unwrap() < 2 {
return Err(parse::Error::new(
lit.span(),
"number of cores must be in the range 2..=255",
));
}
cores = Some(val.unwrap());
}
_ => {
if custom.contains_key(&ident) {
return Err(parse::Error::new(
ident.span(),
"argument appears more than once",
));
}
if let Ok(lit) = input.parse::<LitBool>() {
custom.insert(ident, CustomArg::Bool(lit.value));
} else if let Ok(lit) = input.parse::<LitInt>() {
if lit.suffix().is_empty() {
custom.insert(
ident,
CustomArg::UInt(lit.base10_digits().to_string()),
);
} else {
return Err(parse::Error::new(
ident.span(),
"argument has unexpected value",
));
}
} else if let Ok(p) = input.parse::<Path>() {
custom.insert(ident, CustomArg::Path(p));
} else {
return Err(parse::Error::new(
ident.span(),
"argument has unexpected value",
));
}
}
}
if input.is_empty() {
break;
}
// ,
let _: Token![,] = input.parse()?;
}
Ok(AppArgs {
cores: cores.unwrap_or(1),
custom,
})
})
.parse2(tokens)
}
}
impl App {
pub(crate) fn parse(args: AppArgs, input: Input, settings: &Settings) -> parse::Result<Self> {
let cores = args.cores;
let mut inits = BTreeMap::new();
let mut idles = BTreeMap::new();
let mut late_resources = Map::new();
let mut resources = Map::new();
let mut hardware_tasks = Map::new();
let mut software_tasks = Map::new();
let mut extern_interrupts = ExternInterrupts::new();
let mut seen_idents = BTreeMap::<u8, HashSet<Ident>>::new();
let mut bindings = BTreeMap::<u8, HashSet<Ident>>::new();
let mut check_binding = |core: u8, ident: &Ident| {
let bindings = bindings.entry(core).or_default();
if bindings.contains(ident) {
return Err(parse::Error::new(
ident.span(),
if cores == 1 {
"a task has already been bound to this interrupt"
} else {
"a task has already been bound to this interrupt on this core"
},
));
} else {
bindings.insert(ident.clone());
}
Ok(())
};
let mut check_ident = |core: u8, ident: &Ident| {
let seen_idents = seen_idents.entry(core).or_default();
if seen_idents.contains(ident) {
return Err(parse::Error::new(
ident.span(),
if cores == 1 {
"this identifier has already been used"
} else {
"this identifier has already been used on this core"
},
));
} else {
seen_idents.insert(ident.clone());
}
Ok(())
};
for mut item in input.items {
match item {
Item::Fn(mut item) => {
let span = item.sig.ident.span();
if let Some(pos) = item
.attrs
.iter()
.position(|attr| util::attr_eq(attr, "init"))
{
let args =
InitArgs::parse(cores, item.attrs.remove(pos).tokens, settings, span)?;
if inits.contains_key(&args.core) {
return Err(parse::Error::new(
span,
if cores == 1 {
"`#[init]` function must appear at most once"
} else {
"an `#[init]` function has already been assigned to this core"
},
));
}
check_ident(args.core, &item.sig.ident)?;
inits.insert(args.core, Init::parse(args, item, cores)?);
} else if let Some(pos) = item
.attrs
.iter()
.position(|attr| util::attr_eq(attr, "idle"))
{
let args =
IdleArgs::parse(cores, item.attrs.remove(pos).tokens, settings, span)?;
if idles.contains_key(&args.core) {
return Err(parse::Error::new(
span,
if cores == 1 {
"`#[idle]` function must appear at most once"
} else {
"an `#[idle]` function has already been assigned to this core"
},
));
}
check_ident(args.core, &item.sig.ident)?;
idles.insert(args.core, Idle::parse(args, item, cores)?);
} else if let Some(pos) = item
.attrs
.iter()
.position(|attr| util::attr_eq(attr, "task"))
{
if hardware_tasks.contains_key(&item.sig.ident)
|| software_tasks.contains_key(&item.sig.ident)
{
return Err(parse::Error::new(
span,
"this task is defined multiple times",
));
}
match crate::parse::task_args(
item.attrs.remove(pos).tokens,
cores,
settings,
span,
)? {
Either::Left(args) => {
check_binding(args.core, &args.binds)?;
check_ident(args.core, &item.sig.ident)?;
hardware_tasks.insert(
item.sig.ident.clone(),
HardwareTask::parse(args, item, cores)?,
);
}
Either::Right(args) => {
check_ident(args.core, &item.sig.ident)?;
software_tasks.insert(
item.sig.ident.clone(),
SoftwareTask::parse(args, item, cores)?,
);
}
}
} else {
return Err(parse::Error::new(
span,
"this item must live outside the `#[app]` module",
));
}
}
Item::Struct(ref mut item) if item.ident.to_string() == "Resources" => {
if item.vis != Visibility::Inherited {
return Err(parse::Error::new(
item.span(),
"this item must have inherited / private visibility",
));
}
if !item.attrs.is_empty() {
return Err(parse::Error::new(
item.span(),
"this item must have no attributes",
));
}
if let Fields::Named(fields) = &mut item.fields {
for field in &mut fields.named {
let ident = field.ident.as_ref().expect("UNREACHABLE");
if late_resources.contains_key(ident) || resources.contains_key(ident) {
return Err(parse::Error::new(
ident.span(),
"this resource is listed more than once",
));
}
if let Some(pos) = field
.attrs
.iter()
.position(|attr| util::attr_eq(attr, "init"))
{
let attr = field.attrs.remove(pos);
let late = LateResource::parse(field, ident.span(), cores)?;
resources.insert(
ident.clone(),
Resource {
late,
expr: syn::parse2::<ExprParen>(attr.tokens)?.expr,
},
);
} else {
let late = LateResource::parse(field, ident.span(), cores)?;
late_resources.insert(ident.clone(), late);
}
}
} else {
return Err(parse::Error::new(
item.span(),
"this `struct` must have named fields",
));
}
}
Item::ForeignMod(mod_) => {
if !util::abi_is_c(&mod_.abi) {
return Err(parse::Error::new(
mod_.abi.extern_token.span(),
"this `extern` block must use the \"C\" abi",
));
}
for item in mod_.items {
if let ForeignItem::Fn(item) = item {
if settings.parse_extern_interrupt {
let (core, ident, extern_interrupt) =
ExternInterrupt::parse(item, cores)?;
let extern_interrupts = extern_interrupts.entry(core).or_default();
let span = ident.span();
match extern_interrupts.entry(ident) {
Entry::Occupied(..) => {
return Err(parse::Error::new(
span,
if cores == 1 {
"this extern interrupt is listed more than once"
} else {
"this extern interrupt is listed more than once on \
this core"
},
));
}
Entry::Vacant(entry) => {
entry.insert(extern_interrupt);
}
}
} else {
return Err(parse::Error::new(
item.sig.ident.span(),
"this item must live outside the `#[app]` module",
));
}
} else {
return Err(parse::Error::new(
item.span(),
"this item must live outside the `#[app]` module",
));
}
}
}
_ => {
return Err(parse::Error::new(
item.span(),
"this item must live outside the `#[app]` module",
));
}
}
}
Ok(App {
args,
name: input.ident,
inits,
idles,
late_resources,
resources,
hardware_tasks,
software_tasks,
extern_interrupts,
_extensible: (),
})
}
}