From af53767e162e59e45e18aad61fa79b85d74f0aeb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Thu, 19 May 2016 13:24:14 +0300
Subject: [release/1.4.6] core, core/state, trie: enterprise hand-tuned
 multi-level caching

(cherry picked from commit 748d1c171d74fbf6b6051fd629d3c2204dd930e3)
---
 core/state/statedb.go | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'core/state')

diff --git a/core/state/statedb.go b/core/state/statedb.go
index 27bc38373..70673799e 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -68,6 +68,28 @@ func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
 	}, nil
 }
 
+// Reset clears out all emphemeral state objects from the state db, but keeps
+// the underlying state trie to avoid reloading data for the next operations.
+func (self *StateDB) Reset(root common.Hash) error {
+	var (
+		err error
+		tr  = self.trie
+	)
+	if self.trie.Hash() != root {
+		if tr, err = trie.NewSecure(root, self.db); err != nil {
+			return err
+		}
+	}
+	*self = StateDB{
+		db:           self.db,
+		trie:         tr,
+		stateObjects: make(map[string]*StateObject),
+		refund:       new(big.Int),
+		logs:         make(map[common.Hash]vm.Logs),
+	}
+	return nil
+}
+
 func (self *StateDB) StartRecord(thash, bhash common.Hash, ti int) {
 	self.thash = thash
 	self.bhash = bhash
-- 
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