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use crate::vmcontext::VMSharedSignatureIndex;
use crate::{hash_map, HashMap};
use core::convert::TryFrom;
use cranelift_codegen::ir;
use more_asserts::{assert_lt, debug_assert_lt};
#[derive(Debug)]
pub struct SignatureRegistry {
signature_hash: HashMap<ir::Signature, VMSharedSignatureIndex>,
}
impl SignatureRegistry {
pub fn new() -> Self {
Self {
signature_hash: HashMap::new(),
}
}
pub fn register(&mut self, sig: &ir::Signature) -> VMSharedSignatureIndex {
let len = self.signature_hash.len();
match self.signature_hash.entry(sig.clone()) {
hash_map::Entry::Occupied(entry) => *entry.get(),
hash_map::Entry::Vacant(entry) => {
debug_assert_lt!(
len,
core::u32::MAX as usize,
"Invariant check: signature_hash.len() < core::u32::MAX"
);
let sig_id = VMSharedSignatureIndex::new(u32::try_from(len).unwrap());
entry.insert(sig_id);
sig_id
}
}
}
}