plugeth/core/vm/stack_table.go

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package vm
import (
"fmt"
"github.com/ethereum/go-ethereum/params"
)
func makeStackFunc(pop, push int) stackValidationFunc {
return func(stack *Stack) error {
if err := stack.require(pop); err != nil {
return err
}
if stack.len()+push-pop > int(params.StackLimit) {
return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
}
return nil
}
}
func makeDupStackFunc(n int) stackValidationFunc {
return makeStackFunc(n, n+1)
}
func makeSwapStackFunc(n int) stackValidationFunc {
return makeStackFunc(n, n)
}