Uew new helper

Author: axic

lib/opFns.js

@@ -162,7 +162,7 @@ module.exports = {
     return new BN(word.shrn((31 - pos.toNumber()) * 8).andln(0xff))
   },
   SHL: function (a, b, runState) {
-    if (!runState._common.hardforkIsActiveOnBlock("constantinople", runState.block.header.number)) {
+    if (!isHardforkActive(runState, 'constantinople')) {
       trap(ERROR.INVALID_OPCODE)
     }
     if (a.gten(256)) {
@@ -171,7 +171,7 @@ module.exports = {
     return b.shln(a.toNumber())
   },
   SHR: function (a, b, runState) {
-    if (!runState._common.hardforkIsActiveOnBlock("constantinople", runState.block.header.number)) {
+    if (!isHardforkActive(runState, 'constantinople')) {
       trap(ERROR.INVALID_OPCODE)
     }
     if (a.gten(256)) {
@@ -180,7 +180,7 @@ module.exports = {
     return b.shrn(a.toNumber())
   },
   SAR: function (a, b, runState) {
-    if (!runState._common.hardforkIsActiveOnBlock("constantinople", runState.block.header.number)) {
+    if (!isHardforkActive(runState, 'constantinople')) {
       trap(ERROR.INVALID_OPCODE)
     }
     b = b.fromTwos(256)