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44 lines
1.3 KiB
44 lines
1.3 KiB
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/params"
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)
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func makeStackFunc(pop, push int) stackValidationFunc {
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return func(stack *Stack) error {
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if err := stack.require(pop); err != nil {
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return err
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}
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if stack.len()+push-pop > int(params.StackLimit) {
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return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
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}
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return nil
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}
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}
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func makeDupStackFunc(n int) stackValidationFunc {
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return makeStackFunc(n, n+1)
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}
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func makeSwapStackFunc(n int) stackValidationFunc {
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return makeStackFunc(n, n)
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}
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