core/state: use maps.Clone (#29365)

core: using maps.Clone

Author: cuiweixie

core/state/access_list.go

@@ -17,6 +17,8 @@
 package state
 
 import (
+	"maps"
+
 	"github.com/ethereum/go-ethereum/common"
 )
 
@@ -57,16 +59,10 @@ func newAccessList() *accessList {
 // Copy creates an independent copy of an accessList.
 func (a *accessList) Copy() *accessList {
 	cp := newAccessList()
-	for k, v := range a.addresses {
-		cp.addresses[k] = v
-	}
+	cp.addresses = maps.Clone(a.addresses)
 	cp.slots = make([]map[common.Hash]struct{}, len(a.slots))
 	for i, slotMap := range a.slots {
-		newSlotmap := make(map[common.Hash]struct{}, len(slotMap))
-		for k := range slotMap {
-			newSlotmap[k] = struct{}{}
-		}
-		cp.slots[i] = newSlotmap
+		cp.slots[i] = maps.Clone(slotMap)
 	}
 	return cp
 }

core/state/state_object.go

@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"maps"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -47,11 +48,7 @@ func (s Storage) String() (str string) {
 }
 
 func (s Storage) Copy() Storage {
-	cpy := make(Storage, len(s))
-	for key, value := range s {
-		cpy[key] = value
-	}
-	return cpy
+	return maps.Clone(s)
 }
 
 // stateObject represents an Ethereum account which is being modified.

core/state/statedb.go

@@ -19,6 +19,7 @@ package state
 
 import (
 	"fmt"
+	"maps"
 	"math/big"
 	"slices"
 	"sort"
@@ -750,9 +751,8 @@ func (s *StateDB) Copy() *StateDB {
 		state.stateObjectsDirty[addr] = struct{}{}
 	}
 	// Deep copy the destruction markers.
-	for addr, value := range s.stateObjectsDestruct {
-		state.stateObjectsDestruct[addr] = value
-	}
+	state.stateObjectsDestruct = maps.Clone(s.stateObjectsDestruct)
+
 	// Deep copy the state changes made in the scope of block
 	// along with their original values.
 	state.accounts = copySet(s.accounts)
@@ -770,9 +770,7 @@ func (s *StateDB) Copy() *StateDB {
 		state.logs[hash] = cpy
 	}
 	// Deep copy the preimages occurred in the scope of block
-	for hash, preimage := range s.preimages {
-		state.preimages[hash] = preimage
-	}
+	state.preimages = maps.Clone(s.preimages)
 	// Do we need to copy the access list and transient storage?
 	// In practice: No. At the start of a transaction, these two lists are empty.
 	// In practice, we only ever copy state _between_ transactions/blocks, never