core/state: get rid of field pointer in journal (#30361)

This pull request replaces the field pointer in journal entry with the
field itself, specifically the address of mutated account.

While it will introduce the extra allocation cost, but it's easier for
code reading. Let's measure the overhead overall to see if the change is
acceptable or not.

core/state/journal.go

@@ -153,7 +153,7 @@ func (j *journal) logChange(txHash common.Hash) {
 }
 
 func (j *journal) createObject(addr common.Address) {
-	j.append(createObjectChange{account: &addr})
+	j.append(createObjectChange{account: addr})
 }
 
 func (j *journal) createContract(addr common.Address) {
@@ -161,12 +161,12 @@ func (j *journal) createContract(addr common.Address) {
 }
 
 func (j *journal) destruct(addr common.Address) {
-	j.append(selfDestructChange{account: &addr})
+	j.append(selfDestructChange{account: addr})
 }
 
 func (j *journal) storageChange(addr common.Address, key, prev, origin common.Hash) {
 	j.append(storageChange{
-		account:   &addr,
+		account:   addr,
 		key:       key,
 		prevvalue: prev,
 		origvalue: origin,
@@ -175,7 +175,7 @@ func (j *journal) storageChange(addr common.Address, key, prev, origin common.Ha
 
 func (j *journal) transientStateChange(addr common.Address, key, prev common.Hash) {
 	j.append(transientStorageChange{
-		account:  &addr,
+		account:  addr,
 		key:      key,
 		prevalue: prev,
 	})
@@ -187,25 +187,25 @@ func (j *journal) refundChange(previous uint64) {
 
 func (j *journal) balanceChange(addr common.Address, previous *uint256.Int) {
 	j.append(balanceChange{
-		account: &addr,
+		account: addr,
 		prev:    previous.Clone(),
 	})
 }
 
 func (j *journal) setCode(address common.Address) {
-	j.append(codeChange{account: &address})
+	j.append(codeChange{account: address})
 }
 
 func (j *journal) nonceChange(address common.Address, prev uint64) {
 	j.append(nonceChange{
-		account: &address,
+		account: address,
 		prev:    prev,
 	})
 }
 
 func (j *journal) touchChange(address common.Address) {
 	j.append(touchChange{
-		account: &address,
+		account: address,
 	})
 	if address == ripemd {
 		// Explicitly put it in the dirty-cache, which is otherwise generated from
@@ -215,50 +215,48 @@ func (j *journal) touchChange(address common.Address) {
 }
 
 func (j *journal) accessListAddAccount(addr common.Address) {
-	j.append(accessListAddAccountChange{&addr})
+	j.append(accessListAddAccountChange{addr})
 }
 
 func (j *journal) accessListAddSlot(addr common.Address, slot common.Hash) {
 	j.append(accessListAddSlotChange{
-		address: &addr,
+		address: addr,
-		slot:    &slot,
+		slot:    slot,
 	})
 }
 
 type (
 	// Changes to the account trie.
 	createObjectChange struct {
-		account *common.Address
+		account common.Address
 	}
-
 	// createContractChange represents an account becoming a contract-account.
 	// This event happens prior to executing initcode. The journal-event simply
 	// manages the created-flag, in order to allow same-tx destruction.
 	createContractChange struct {
 		account common.Address
 	}
-
 	selfDestructChange struct {
-		account *common.Address
+		account common.Address
 	}
 
 	// Changes to individual accounts.
 	balanceChange struct {
-		account *common.Address
+		account common.Address
 		prev    *uint256.Int
 	}
 	nonceChange struct {
-		account *common.Address
+		account common.Address
 		prev    uint64
 	}
 	storageChange struct {
-		account   *common.Address
+		account   common.Address
 		key       common.Hash
 		prevvalue common.Hash
 		origvalue common.Hash
 	}
 	codeChange struct {
-		account *common.Address
+		account common.Address
 	}
 
 	// Changes to other state values.
@@ -269,31 +267,31 @@ type (
 		txhash common.Hash
 	}
 	touchChange struct {
-		account *common.Address
+		account common.Address
 	}
 
 	// Changes to the access list
 	accessListAddAccountChange struct {
-		address *common.Address
+		address common.Address
 	}
 	accessListAddSlotChange struct {
-		address *common.Address
+		address common.Address
-		slot    *common.Hash
+		slot    common.Hash
 	}
 
 	// Changes to transient storage
 	transientStorageChange struct {
-		account       *common.Address
+		account       common.Address
 		key, prevalue common.Hash
 	}
 )
 
 func (ch createObjectChange) revert(s *StateDB) {
-	delete(s.stateObjects, *ch.account)
+	delete(s.stateObjects, ch.account)
 }
 
 func (ch createObjectChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch createObjectChange) copy() journalEntry {
@@ -317,14 +315,14 @@ func (ch createContractChange) copy() journalEntry {
 }
 
 func (ch selfDestructChange) revert(s *StateDB) {
-	obj := s.getStateObject(*ch.account)
+	obj := s.getStateObject(ch.account)
 	if obj != nil {
 		obj.selfDestructed = false
 	}
 }
 
 func (ch selfDestructChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch selfDestructChange) copy() journalEntry {
@@ -339,7 +337,7 @@ func (ch touchChange) revert(s *StateDB) {
 }
 
 func (ch touchChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch touchChange) copy() journalEntry {
@@ -349,11 +347,11 @@ func (ch touchChange) copy() journalEntry {
 }
 
 func (ch balanceChange) revert(s *StateDB) {
-	s.getStateObject(*ch.account).setBalance(ch.prev)
+	s.getStateObject(ch.account).setBalance(ch.prev)
 }
 
 func (ch balanceChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch balanceChange) copy() journalEntry {
@@ -364,11 +362,11 @@ func (ch balanceChange) copy() journalEntry {
 }
 
 func (ch nonceChange) revert(s *StateDB) {
-	s.getStateObject(*ch.account).setNonce(ch.prev)
+	s.getStateObject(ch.account).setNonce(ch.prev)
 }
 
 func (ch nonceChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch nonceChange) copy() journalEntry {
@@ -379,11 +377,11 @@ func (ch nonceChange) copy() journalEntry {
 }
 
 func (ch codeChange) revert(s *StateDB) {
-	s.getStateObject(*ch.account).setCode(types.EmptyCodeHash, nil)
+	s.getStateObject(ch.account).setCode(types.EmptyCodeHash, nil)
 }
 
 func (ch codeChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch codeChange) copy() journalEntry {
@@ -391,11 +389,11 @@ func (ch codeChange) copy() journalEntry {
 }
 
 func (ch storageChange) revert(s *StateDB) {
-	s.getStateObject(*ch.account).setState(ch.key, ch.prevvalue, ch.origvalue)
+	s.getStateObject(ch.account).setState(ch.key, ch.prevvalue, ch.origvalue)
 }
 
 func (ch storageChange) dirtied() *common.Address {
-	return ch.account
+	return &ch.account
 }
 
 func (ch storageChange) copy() journalEntry {
@@ -407,7 +405,7 @@ func (ch storageChange) copy() journalEntry {
 }
 
 func (ch transientStorageChange) revert(s *StateDB) {
-	s.setTransientState(*ch.account, ch.key, ch.prevalue)
+	s.setTransientState(ch.account, ch.key, ch.prevalue)
 }
 
 func (ch transientStorageChange) dirtied() *common.Address {
@@ -466,7 +464,7 @@ func (ch accessListAddAccountChange) revert(s *StateDB) {
 		(addr) at this point, since no storage adds can remain when come upon
 		a single (addr) change.
 	*/
-	s.accessList.DeleteAddress(*ch.address)
+	s.accessList.DeleteAddress(ch.address)
 }
 
 func (ch accessListAddAccountChange) dirtied() *common.Address {
@@ -480,7 +478,7 @@ func (ch accessListAddAccountChange) copy() journalEntry {
 }
 
 func (ch accessListAddSlotChange) revert(s *StateDB) {
-	s.accessList.DeleteSlot(*ch.address, *ch.slot)
+	s.accessList.DeleteSlot(ch.address, ch.slot)
 }
 
 func (ch accessListAddSlotChange) dirtied() *common.Address {