29 lines
555 B
Go
29 lines
555 B
Go
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)
|
|
}
|