From caa2c23a38141911a570ba098a940b4fdbf0aa88 Mon Sep 17 00:00:00 2001
From: Martin Holst Swende <martin@swende.se>
Date: Sun, 12 Aug 2018 14:47:03 +0200
Subject: core,state: finish implementing Eip 1283

---
 core/state/state_object.go | 10 ++++++++++
 core/state/statedb.go      |  8 ++++++++
 2 files changed, 18 insertions(+)

(limited to 'core/state')

diff --git a/core/state/state_object.go b/core/state/state_object.go
index 0b72d0114..b05afec93 100644
--- a/core/state/state_object.go
+++ b/core/state/state_object.go
@@ -183,6 +183,16 @@ func (self *stateObject) GetState(db Database, key common.Hash) common.Hash {
 	return value
 }
 
+// GetOriginalStateValue returns the state value that is currently in the Trie, that is, ignoring any
+// changes that have been made but not yet written to trie.
+func (self *stateObject) GetOriginalStateValue(db Database, key common.Hash) common.Hash{
+	if original, exist:= self.originalValue[key]; exist {
+		// original value has been set, return it
+		return original
+	}
+	return self.GetState(db, key)
+}
+
 // SetState updates a value in account storage.
 func (self *stateObject) SetState(db Database, key, value common.Hash) {
 	prev := self.GetState(db, key)
diff --git a/core/state/statedb.go b/core/state/statedb.go
index d9300012d..515ff57bf 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -255,6 +255,14 @@ func (self *StateDB) GetState(addr common.Address, bhash common.Hash) common.Has
 	return common.Hash{}
 }
 
+func (self *StateDB) GetStateOriginal(addr common.Address, bhash common.Hash) common.Hash {
+	stateObject := self.getStateObject(addr)
+	if stateObject != nil {
+		return stateObject.GetOriginalStateValue(self.db, bhash)
+	}
+	return common.Hash{}
+}
+
 // Database retrieves the low level database supporting the lower level trie ops.
 func (self *StateDB) Database() Database {
 	return self.db
-- 
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