core/vm/stack_table.go


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package vm

import (
    "fmt"

    "github.com/ethereum/go-ethereum/params"
)

func makeStackFunc(pop, diff int) stackValidationFunc {
    return func(stack *Stack) error {
        if err := stack.require(pop); err != nil {
            return err
        }

        if int64(stack.len()+diff) > params.StackLimit.Int64() {
            return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
        }
        return nil
    }
}

func makeDupStackFunc(n int) stackValidationFunc {
    return makeStackFunc(n, 1)
}

func makeSwapStackFunc(n int) stackValidationFunc {
    return makeStackFunc(n, 0)
}