calculate cost of SSTORE & store empty storage if creation

src/web3Provider/web3VmProvider.js

 var util = require('../helpers/util')
+var uiutil = require('../helpers/ui')
 var traceHelper = require('../helpers/traceHelper')
 var Web3 = require('web3')
+var fees = require('ethereum-common')
+var ethutil = require('ethereumjs-util')
 
 function web3VmProvider () {
   var self = this
@@ -9,6 +12,8 @@ function web3VmProvider () {
   this.vmTraces = {}
   this.txs = {}
   this.processingHash
+  this.processingAddress
+  this.processingIndex
   this.incr = 0
   this.eth = {}
   this.debug = {}
@@ -43,7 +48,7 @@ web3VmProvider.prototype.releaseCurrentHash = function () {
   return ret
 }
 
-web3VmProvider.prototype.txWillProcess = function (self, data) {
+web3VmProvider.prototype.txWillProcess = function (self, data) {  
   self.incr++
   self.processingHash = util.hexConvert(data.hash())
   self.vmTraces[self.processingHash] = {
@@ -57,6 +62,7 @@ web3VmProvider.prototype.txWillProcess = function (self, data) {
   if (data.to && data.to.length) {
     tx.to = util.hexConvert(data.to)
   }
+  this.processingAddress = tx.to
   tx.data = util.hexConvert(data.data)
   tx.input = util.hexConvert(data.input)
   tx.gas = util.hexConvert(data.gas)
@@ -70,6 +76,7 @@ web3VmProvider.prototype.txWillProcess = function (self, data) {
       self.storageCache[self.processingHash][tx.to] = storage
     })
   }
+  this.processingIndex = 0
 }
 
 web3VmProvider.prototype.txProcessed = function (self, data) {
@@ -79,6 +86,8 @@ web3VmProvider.prototype.txProcessed = function (self, data) {
   } else {
     self.vmTraces[self.processingHash].return = util.hexConvert(data.vm.return)
   }
+  this.processingIndex = null
+  this.processingAddress = null
 }
 
 web3VmProvider.prototype.pushTrace = function (self, data) {
@@ -95,15 +104,36 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
     gasCost: data.opcode.fee.toString(),
     gas: data.gasLeft.toString()
   }
+  if (data.opcode.name === 'SSTORE') {
+    var currentStorage = this.storageCache[this.processingHash][this.processingAddress]
+    var key = step.stack[step.stack.length - 1]
+    var value = step.stack[step.stack.length - 2]
+    value = util.hexToIntArray(value)
+    value = ethutil.unpad(value)
+    if (value.length === 0) {
+      data.opcode.fee = fees.sstoreResetGas.v
+    } else if (currentStorage[key] === undefined) {
+      data.opcode.fee = fees.sstoreSetGas.v
+    } else {
+      data.opcode.fee = fees.sstoreResetGas.v
+    }
+    step.gasCost = data.opcode.fee
+  }
   self.vmTraces[self.processingHash].structLogs.push(step)
   if (traceHelper.newContextStorage(step)) {
-    if (!self.storageCache[self.processingHash][address]) {
-      var address = step.stack[step.stack.length - 2]
-      self.vm.stateManager.dumpStorage(address, function (storage) {
-        self.storageCache[self.processingHash][address] = storage
-      })
+    if (step.op === 'CREATE') {
+      this.processingAddress = traceHelper.contractCreationToken(this.processingIndex)
+      this.storageCache[this.processingHash][this.processingAddress] = {}
+    } else {
+      this.processingAddress = uiutil.normalizeHex(step.stack[step.stack.length - 2])
+      if (!self.storageCache[self.processingHash][this.processingAddress]) {
+        self.vm.stateManager.dumpStorage(this.processingAddress, function (storage) {
+          self.storageCache[self.processingHash][this.processingAddress] = storage
+        })
+      }
     }
   }
+  this.processingIndex++
 }
 
 web3VmProvider.prototype.getCode = function (address, cb) {