github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/core/vm/stack_table.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 19:16:36</date>
    10  //</624450083424833536>
    11  
    12  
    13  package vm
    14  
    15  import (
    16  	"fmt"
    17  
    18  	"github.com/ethereum/go-ethereum/params"
    19  )
    20  
    21  func makeStackFunc(pop, push int) stackValidationFunc {
    22  	return func(stack *Stack) error {
    23  		if err := stack.require(pop); err != nil {
    24  			return err
    25  		}
    26  
    27  		if stack.len()+push-pop > int(params.StackLimit) {
    28  			return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
    29  		}
    30  		return nil
    31  	}
    32  }
    33  
    34  func makeDupStackFunc(n int) stackValidationFunc {
    35  	return makeStackFunc(n, n+1)
    36  }
    37  
    38  func makeSwapStackFunc(n int) stackValidationFunc {
    39  	return makeStackFunc(n, n)
    40  }
    41