Introduce stateManager.copy() and use that in VM.copy()

Author: axic

lib/index.js

@@ -80,10 +80,7 @@ VM.prototype.runCall = require('./runCall.js')
 VM.prototype.runBlockchain = require('./runBlockchain.js')
 
 VM.prototype.copy = function () {
-  return new VM({
-    state: this.trie.copy(),
-    blockchain: this.blockchain
-  })
+  return new VM({ stateManager: this.stateManager.copy() })
 }
 
 /**

lib/stateManager.js

@@ -33,6 +33,10 @@ function StateManager (opts) {
 
 var proto = StateManager.prototype
 
+proto.copy = function () {
+  return new StateManager({ trie: this.trie.copy(), blockchain: this.blockchain })
+}
+
 // gets the account from the cache, or triggers a lookup and stores
 // the result in the cache
 proto.getAccount = function (address, cb) {