core/vm: add precompile cache

core/vm/contracts_cache.go

@@ -0,0 +1,30 @@
+package vm
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/lru"
+)
+
+var caches map[common.Address]*lru.Cache[string, []byte]
+
+func init() {
+	caches = make(map[common.Address]*lru.Cache[string, []byte])
+}
+
+func addCache(precompile common.Address, input, output []byte) {
+	cache, ok := caches[precompile]
+	if !ok {
+		cache = lru.NewCache[string, []byte](128)
+		caches[precompile] = cache
+	}
+	cache.Add(string(input), output)
+}
+
+func getCache(precompile common.Address, input []byte) ([]byte, bool) {
+	cache, ok := caches[precompile]
+	if !ok {
+		caches[precompile] = lru.NewCache[string, []byte](128)
+		return nil, false
+	}
+	return cache.Get(string(input))
+}