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
use std::borrow::Borrow;
use snarkvm_fields::Field;
use snarkvm_r1cs::{errors::SynthesisError, ConstraintSystem};
use crate::{
bits::boolean::{AllocatedBit, Boolean},
integers::{int::*, uint::*},
traits::{alloc::AllocGadget, integers::Integer},
};
macro_rules! alloc_gadget_fn_impl {
($gadget: ident, $fn_name: ident) => {
fn $fn_name<
Fn: FnOnce() -> Result<T, SynthesisError>,
T: Borrow<<$gadget as Integer>::IntegerType>,
CS: ConstraintSystem<F>,
>(
mut cs: CS,
value_gen: Fn,
) -> Result<Self, SynthesisError> {
let value = value_gen().map(|val| *val.borrow());
let values = match value {
Ok(mut val) => {
let mut v = Vec::with_capacity(<$gadget as Integer>::SIZE);
for _ in 0..<$gadget as Integer>::SIZE {
v.push(Some(val & 1 == 1));
val >>= 1;
}
v
}
_ => vec![None; <$gadget as Integer>::SIZE],
};
let bits = values
.into_iter()
.enumerate()
.map(|(i, v)| {
Ok(Boolean::from(AllocatedBit::$fn_name(
&mut cs.ns(|| format!("allocated bit_gadget {}", i)),
|| v.ok_or(SynthesisError::AssignmentMissing),
)?))
})
.collect::<Result<Vec<_>, SynthesisError>>()?;
Ok(Self::new(bits, value.ok()))
}
};
}
macro_rules! alloc_gadget_int_impl {
($($gadget: ident)*) => ($(
impl<F: Field> AllocGadget<<$gadget as Integer>::IntegerType, F> for $gadget {
alloc_gadget_fn_impl!($gadget, alloc);
alloc_gadget_fn_impl!($gadget, alloc_input);
}
)*)
}
alloc_gadget_int_impl!(Int8 Int16 Int32 Int64 Int128 UInt8 UInt16 UInt32 UInt64 UInt128);