1 files changed, 42 insertions, 0 deletions
diff --git a/core/vm/stack_table.go b/core/vm/stack_table.go
new file mode 100644
index 0000000..192d024
--- /dev/null
+++ b/core/vm/stack_table.go
@@ -0,0 +1,42 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package vm
+
+import (
+	"github.com/ava-labs/coreth/params"
+)
+
+func minSwapStack(n int) int {
+	return minStack(n, n)
+}
+func maxSwapStack(n int) int {
+	return maxStack(n, n)
+}
+
+func minDupStack(n int) int {
+	return minStack(n, n+1)
+}
+func maxDupStack(n int) int {
+	return maxStack(n, n+1)
+}
+
+func maxStack(pop, push int) int {
+	return int(params.StackLimit) + pop - push
+}
+func minStack(pops, push int) int {
+	return pops
+}