From 4547a05a689e6a0f29dd2d90e840e84de7f564f4 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Wed, 31 Dec 2014 11:12:40 +0100
Subject: Minor improvements

* Moved gas and mem size to its own function
---
 vm/stack.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'vm/stack.go')

diff --git a/vm/stack.go b/vm/stack.go
index 6091479cb..b9eaa10cd 100644
--- a/vm/stack.go
+++ b/vm/stack.go
@@ -91,6 +91,12 @@ func (st *Stack) Get(amount *big.Int) []*big.Int {
 	return nil
 }
 
+func (st *Stack) require(n int) {
+	if st.Len() < n {
+		panic(fmt.Sprintf("stack underflow (%d <=> %d)", st.Len(), n))
+	}
+}
+
 func (st *Stack) Print() {
 	fmt.Println("### stack ###")
 	if len(st.data) > 0 {
-- 
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