1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
#[macro_use]
extern crate quote;
extern crate syn;
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
use syn::{Ident, IntTy, Lit};
fn main() {
let bits = if env::var_os("CARGO_FEATURE_P2").is_some() {
2
} else if env::var_os("CARGO_FEATURE_P3").is_some() {
3
} else if env::var_os("CARGO_FEATURE_P4").is_some() {
4
} else if env::var_os("CARGO_FEATURE_P5").is_some() {
5
} else {
panic!(
"Specify the number of priority bits through one of these Cargo \
features: P2, P3, P4 or P5"
);
};
let n = Lit::Int(bits, IntTy::Unsuffixed);
let mut tokens = vec![];
tokens.push(
quote! {
const PRIORITY_BITS: u8 = #n;
},
);
// Ceilings
for i in 1..(1 << bits) + 1 {
let c = Ident::new(format!("C{}", i));
let u = Ident::new(format!("U{}", i));
tokens.push(
quote! {
/// Ceiling
pub type #c = C<::typenum::#u>;
unsafe impl Ceiling for #c {}
},
);
}
// Priorities
for i in 1..(1 << bits) + 1 {
let p = Ident::new(format!("P{}", i));
let u = Ident::new(format!("U{}", i));
tokens.push(
quote! {
/// Priority
pub type #p = P<::typenum::#u>;
unsafe impl Priority for #p {}
unsafe impl Level for ::typenum::#u {
fn hw() -> u8 {
logical2hw(::typenum::#u::to_u8())
}
}
},
);
}
// GreaterThanOrEqual
for i in 1..(1 << bits) + 1 {
for j in 1..(i + 1) {
let i = Ident::new(format!("U{}", i));
let j = Ident::new(format!("U{}", j));
tokens.push(
quote! {
unsafe impl GreaterThanOrEqual<::typenum::#j> for
::typenum::#i {}
},
);
}
}
let u = Ident::new(format!("U{}", (1 << bits)));
tokens.push(quote! {
#[doc(hidden)]
pub type CMAX = C<::typenum::#u>;
/// Maximum priority level
pub type UMAX = ::typenum::#u;
});
let tokens = quote! {
#(#tokens)*
};
let out_dir = env::var("OUT_DIR").unwrap();
let mut out = File::create(PathBuf::from(out_dir).join("prio.rs")).unwrap();
out.write_all(tokens.as_str().as_bytes()).unwrap();
println!("cargo:rerun-if-changed=build.rs");
}
|
