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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#![feature(macro_rules, plugin_registrar, quote, phase)]
#![deny(unused_imports, unused_variable)]
//! Exports macros for use in other Servo crates.
extern crate syntax;
#[phase(plugin, link)]
extern crate rustc;
#[cfg(test)]
extern crate sync;
use syntax::ast;
use rustc::lint::{Context, LintPass, LintPassObject, LintArray};
use rustc::plugin::Registry;
use rustc::middle::ty::expr_ty;
use rustc::middle::typeck::astconv::AstConv;
use rustc::util::ppaux::Repr;
declare_lint!(TRANSMUTE_TYPE_LINT, Allow,
"Warn and report types being transmuted")
struct Pass;
impl LintPass for Pass {
fn get_lints(&self) -> LintArray {
lint_array!(TRANSMUTE_TYPE_LINT)
}
fn check_expr(&mut self, cx: &Context, ex: &ast::Expr) {
match ex.node {
ast::ExprCall(ref expr, ref args) => {
match expr.node {
ast::ExprPath(ref path) => {
if path.segments.last()
.map_or(false, |ref segment| segment.identifier.name.as_str() == "transmute")
&& args.len() == 1 {
let tcx = cx.tcx();
cx.span_lint(TRANSMUTE_TYPE_LINT, ex.span,
format!("Transmute from {} to {} detected",
expr_ty(tcx, ex).repr(tcx),
expr_ty(tcx, &**args.get(0)).repr(tcx)
).as_slice());
}
}
_ => {}
}
}
_ => {}
}
}
}
#[plugin_registrar]
pub fn plugin_registrar(reg: &mut Registry) {
reg.register_lint_pass(box Pass as LintPassObject);
}
#[macro_export]
macro_rules! bitfield(
($bitfieldname:ident, $getter:ident, $setter:ident, $value:expr) => (
impl $bitfieldname {
#[inline]
pub fn $getter(self) -> bool {
let $bitfieldname(this) = self;
(this & $value) != 0
}
#[inline]
pub fn $setter(&mut self, value: bool) {
let $bitfieldname(this) = *self;
*self = $bitfieldname((this & !$value) | (if value { $value } else { 0 }))
}
}
)
)
#[macro_export]
macro_rules! lazy_init(
($(static ref $N:ident : $T:ty = $e:expr;)*) => (
$(
#[allow(non_camel_case_types)]
struct $N {__unit__: ()}
static $N: $N = $N {__unit__: ()};
impl Deref<$T> for $N {
fn deref<'a>(&'a self) -> &'a $T {
unsafe {
static mut s: *const $T = 0 as *const $T;
static mut ONCE: ::sync::one::Once = ::sync::one::ONCE_INIT;
ONCE.doit(|| {
s = ::std::mem::transmute::<Box<$T>, *const $T>(box () ($e));
});
&*s
}
}
}
)*
)
)
#[cfg(test)]
mod tests {
use std::collections::hashmap::HashMap;
lazy_init! {
static ref NUMBER: uint = times_two(3);
static ref VEC: [Box<uint>, ..3] = [box 1, box 2, box 3];
static ref OWNED_STRING: String = "hello".to_string();
static ref HASHMAP: HashMap<uint, &'static str> = {
let mut m = HashMap::new();
m.insert(0u, "abc");
m.insert(1, "def");
m.insert(2, "ghi");
m
};
}
fn times_two(n: uint) -> uint {
n * 2
}
#[test]
fn test_basic() {
assert_eq!(*OWNED_STRING, "hello".to_string());
assert_eq!(*NUMBER, 6);
assert!(HASHMAP.find(&1).is_some());
assert!(HASHMAP.find(&3).is_none());
assert_eq!(VEC.as_slice(), &[box 1, box 2, box 3]);
}
#[test]
fn test_repeat() {
assert_eq!(*NUMBER, 6);
assert_eq!(*NUMBER, 6);
assert_eq!(*NUMBER, 6);
}
}
|
