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Get the proc macro working. It's time to release.

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This commit is contained in:
Bradlee Speice
2018-11-11 22:22:24 -05:00
parent 80f1d5c1f8
commit 8bc768e40b
3 changed files with 61 additions and 11 deletions
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56
qadapt-macro/src/lib.rs
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@ -7,8 +7,42 @@
// #![deny(missing_docs)]
extern crate proc_macro;
use proc_macro::TokenTree;
use proc_macro::TokenStream;
use proc_macro::TokenTree;
use proc_macro::Spacing;
use proc_macro::Span;
use proc_macro::Delimiter;
use std::iter::FromIterator;
type TT = proc_macro::TokenTree;
type TS = proc_macro::TokenStream;
type G = proc_macro::Group;
type I = proc_macro::Ident;
type P = proc_macro::Punct;
fn protected_group(fn_body: G) -> TokenTree {
let tt: Vec<TT> = vec![
P::new(':', Spacing::Joint).into(),
P::new(':', Spacing::Alone).into(),
I::new("qadapt", Span::call_site()).into(),
P::new(':', Spacing::Joint).into(),
P::new(':', Spacing::Alone).into(),
I::new("enter_protected", Span::call_site()).into(),
G::new(Delimiter::Parenthesis, TokenStream::new()).into(),
P::new(';', Spacing::Alone).into(),
fn_body.into(),
P::new(':', Spacing::Joint).into(),
P::new(':', Spacing::Alone).into(),
I::new("qadapt", Span::call_site()).into(),
P::new(':', Spacing::Joint).into(),
P::new(':', Spacing::Alone).into(),
I::new("exit_protected", Span::call_site()).into(),
G::new(Delimiter::Parenthesis, TokenStream::new()).into(),
P::new(';', Spacing::Alone).into(),
];
G::new(Delimiter::Brace, TS::from_iter(tt)).into()
}
/// Set up the QADAPT allocator to trigger a panic if any allocations happen during
/// calls to this function.
@ -18,13 +52,19 @@ use proc_macro::TokenStream;
/// separate thread, QADAPT will not trigger a panic.
#[proc_macro_attribute]
pub fn allocate_panic(_attr: TokenStream, item: TokenStream) -> TokenStream {
let ret = item.clone();
let mut ret: Vec<TokenTree> = Vec::new();
let mut token_iter = item.into_iter();
match token_iter.next() {
Some(TokenTree::Ident(ref i)) if i.to_string() == "fn" => (),
_ => panic!("#[allocate_panic] macro can only be applied to functions")
let mut fn_body = None;
let mut item_iter = item.into_iter();
while let Some(tt) = item_iter.next() {
match tt {
TokenTree::Group(ref g) if g.delimiter() == Delimiter::Brace => {
fn_body = Some(g.clone());
break;
},
tt => ret.push(tt)
}
}
ret
ret.push(protected_group(fn_body.unwrap()));
TokenStream::from_iter(ret.into_iter())
}