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
use std::collections::{hash_map, HashMap};
use std::convert::TryFrom;
use wasmtime_environ::wasm::WasmFuncType;
use wasmtime_runtime::{VMSharedSignatureIndex, VMTrampoline};
#[derive(Debug, Default)]
pub struct SignatureRegistry {
wasm2index: HashMap<WasmFuncType, VMSharedSignatureIndex>,
index_map: Vec<Entry>,
}
#[derive(Debug)]
struct Entry {
wasm: WasmFuncType,
trampoline: VMTrampoline,
}
impl SignatureRegistry {
pub fn register(
&mut self,
wasm: &WasmFuncType,
trampoline: VMTrampoline,
) -> VMSharedSignatureIndex {
let len = self.wasm2index.len();
match self.wasm2index.entry(wasm.clone()) {
hash_map::Entry::Occupied(entry) => *entry.get(),
hash_map::Entry::Vacant(entry) => {
assert!(
len < std::u32::MAX as usize,
"Invariant check: signature_hash.len() < std::u32::MAX"
);
debug_assert_eq!(len, self.index_map.len());
let index = VMSharedSignatureIndex::new(u32::try_from(len).unwrap());
self.index_map.push(Entry {
wasm: wasm.clone(),
trampoline,
});
entry.insert(index);
index
}
}
}
pub fn lookup(&self, wasm: &WasmFuncType) -> Option<VMSharedSignatureIndex> {
self.wasm2index.get(wasm).cloned()
}
pub fn lookup_shared(
&self,
idx: VMSharedSignatureIndex,
) -> Option<(&WasmFuncType, VMTrampoline)> {
self.index_map
.get(idx.bits() as usize)
.map(|e| (&e.wasm, e.trampoline))
}
}