forked from mirrors/linux
1fbde52bde
This crate contains all the procedural macros ("proc macros")
shared by all the kernel.
Procedural macros allow to create syntax extensions. They run at
compile-time and can consume as well as produce Rust syntax.
For instance, the `module!` macro that is used by Rust modules
is implemented here. It allows to easily declare the equivalent
information to the `MODULE_*` macros in C modules, e.g.:
module! {
type: RustMinimal,
name: b"rust_minimal",
author: b"Rust for Linux Contributors",
description: b"Rust minimal sample",
license: b"GPL",
}
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Finn Behrens <me@kloenk.de>
Signed-off-by: Finn Behrens <me@kloenk.de>
Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Co-developed-by: Matthew Bakhtiari <dev@mtbk.me>
Signed-off-by: Matthew Bakhtiari <dev@mtbk.me>
Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
use proc_macro::{token_stream, TokenTree};
|
|
|
|
pub(crate) fn try_ident(it: &mut token_stream::IntoIter) -> Option<String> {
|
|
if let Some(TokenTree::Ident(ident)) = it.next() {
|
|
Some(ident.to_string())
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
pub(crate) fn try_literal(it: &mut token_stream::IntoIter) -> Option<String> {
|
|
if let Some(TokenTree::Literal(literal)) = it.next() {
|
|
Some(literal.to_string())
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
pub(crate) fn try_byte_string(it: &mut token_stream::IntoIter) -> Option<String> {
|
|
try_literal(it).and_then(|byte_string| {
|
|
if byte_string.starts_with("b\"") && byte_string.ends_with('\"') {
|
|
Some(byte_string[2..byte_string.len() - 1].to_string())
|
|
} else {
|
|
None
|
|
}
|
|
})
|
|
}
|
|
|
|
pub(crate) fn expect_ident(it: &mut token_stream::IntoIter) -> String {
|
|
try_ident(it).expect("Expected Ident")
|
|
}
|
|
|
|
pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char {
|
|
if let TokenTree::Punct(punct) = it.next().expect("Reached end of token stream for Punct") {
|
|
punct.as_char()
|
|
} else {
|
|
panic!("Expected Punct");
|
|
}
|
|
}
|
|
|
|
pub(crate) fn expect_byte_string(it: &mut token_stream::IntoIter) -> String {
|
|
try_byte_string(it).expect("Expected byte string")
|
|
}
|
|
|
|
pub(crate) fn expect_end(it: &mut token_stream::IntoIter) {
|
|
if it.next().is_some() {
|
|
panic!("Expected end");
|
|
}
|
|
}
|