From 412c99880c587aba13ec66f7fe7a7a2c18e98302 Mon Sep 17 00:00:00 2001
From: Daniel Liu <139250065@qq.com>
Date: Fri, 17 Apr 2026 14:55:56 +0800
Subject: [PATCH] feat(core): create global hasher pool #31769

Replace pooled and embedded Keccak state with stateless crypto helpers.
This simplifies trie node hashing and EVM keccak handling while keeping focused package tests green.
---
 core/rawdb/accessors_trie.go | 30 +++---------------------------
 core/vm/evm.go               |  7 ++-----
 core/vm/instructions.go      |  9 ++++-----
 3 files changed, 9 insertions(+), 37 deletions(-)

diff --git a/core/rawdb/accessors_trie.go b/core/rawdb/accessors_trie.go
index 42493c59fb22..f41d31b94f43 100644
--- a/core/rawdb/accessors_trie.go
+++ b/core/rawdb/accessors_trie.go
@@ -18,7 +18,6 @@ package rawdb
 
 import (
 	"fmt"
-	"sync"
 
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/crypto"
@@ -45,25 +44,6 @@ const HashScheme = "hashScheme"
 // on extra state diffs to survive deep reorg.
 const PathScheme = "pathScheme"
 
-// hasher is used to compute the sha256 hash of the provided data.
-type hasher struct{ sha crypto.KeccakState }
-
-var hasherPool = sync.Pool{
-	New: func() interface{} { return &hasher{sha: crypto.NewKeccakState()} },
-}
-
-func newHasher() *hasher {
-	return hasherPool.Get().(*hasher)
-}
-
-func (h *hasher) hash(data []byte) common.Hash {
-	return crypto.HashData(h.sha, data)
-}
-
-func (h *hasher) release() {
-	hasherPool.Put(h)
-}
-
 // ReadAccountTrieNode retrieves the account trie node with the specified node path.
 func ReadAccountTrieNode(db ethdb.KeyValueReader, path []byte) []byte {
 	data, _ := db.Get(accountTrieNodeKey(path))
@@ -170,9 +150,7 @@ func HasTrieNode(db ethdb.KeyValueReader, owner common.Hash, path []byte, hash c
 		if len(blob) == 0 {
 			return false
 		}
-		h := newHasher()
-		defer h.release()
-		return h.hash(blob) == hash // exists but not match
+		return crypto.Keccak256Hash(blob) == hash // exist and match
 	default:
 		panic(fmt.Sprintf("Unknown scheme %v", scheme))
 	}
@@ -194,10 +172,8 @@ func ReadTrieNode(db ethdb.KeyValueReader, owner common.Hash, path []byte, hash
 		if len(blob) == 0 {
 			return nil
 		}
-		h := newHasher()
-		defer h.release()
-		if h.hash(blob) != hash {
-			return nil // exists but not match
+		if crypto.Keccak256Hash(blob) != hash {
+			return nil // exist but not match
 		}
 		return blob
 	default:
diff --git a/core/vm/evm.go b/core/vm/evm.go
index 181ebbad43a3..548cf2d8765c 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -124,9 +124,6 @@ type EVM struct {
 	// jumpDests stores results of JUMPDEST analysis.
 	jumpDests JumpDestCache
 
-	hasher    crypto.KeccakState // Keccak256 hasher instance shared across opcodes
-	hasherBuf common.Hash        // Keccak256 hasher result array shared across opcodes
-
 	readOnly   bool   // Whether to throw on stateful modifications
 	returnData []byte // Last CALL's return data for subsequent reuse
 }
@@ -144,7 +141,6 @@ func NewEVM(blockCtx BlockContext, statedb StateDB, tradingStateDB *tradingstate
 		chainConfig:    chainConfig,
 		chainRules:     chainConfig.Rules(blockCtx.BlockNumber),
 		jumpDests:      newMapJumpDests(),
-		hasher:         crypto.NewKeccakState(),
 	}
 	evm.precompiles = activePrecompiledContracts(evm.chainRules)
 
@@ -566,7 +562,8 @@ func (evm *EVM) Create(caller common.Address, code []byte, gas uint64, value *ui
 // The different between Create2 with Create is Create2 uses keccak256(0xff ++ msg.sender ++ salt ++ keccak256(init_code))[12:]
 // instead of the usual sender-and-nonce-hash as the address where the contract is initialized at.
 func (evm *EVM) Create2(caller common.Address, code []byte, gas uint64, endowment *uint256.Int, salt *uint256.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
-	contractAddr = crypto.CreateAddress2(caller, salt.Bytes32(), crypto.Keccak256(code))
+	inithash := crypto.Keccak256Hash(code)
+	contractAddr = crypto.CreateAddress2(caller, salt.Bytes32(), inithash[:])
 	return evm.create(caller, code, gas, endowment, contractAddr, CREATE2)
 }
 
diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 8773d619658b..b9a31e310722 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -22,6 +22,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/core/tracing"
 	"github.com/XinFinOrg/XDPoSChain/core/types"
+	"github.com/XinFinOrg/XDPoSChain/crypto"
 	"github.com/XinFinOrg/XDPoSChain/params"
 	"github.com/holiman/uint256"
 )
@@ -233,14 +234,12 @@ func opKeccak256(pc *uint64, evm *EVM, scope *ScopeContext) ([]byte, error) {
 	offset, size := scope.Stack.pop(), scope.Stack.peek()
 	data := scope.Memory.GetPtr(offset.Uint64(), size.Uint64())
 
-	evm.hasher.Reset()
-	evm.hasher.Write(data)
-	evm.hasher.Read(evm.hasherBuf[:])
+	hash := crypto.Keccak256Hash(data)
 
 	if evm.Config.EnablePreimageRecording {
-		evm.StateDB.AddPreimage(evm.hasherBuf, data)
+		evm.StateDB.AddPreimage(hash, data)
 	}
-	size.SetBytes(evm.hasherBuf[:])
+	size.SetBytes(hash[:])
 	return nil, nil
 }