github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/core/vm/stack_table.go (about)

     1  // This file is part of the go-sberex library. The go-sberex library is 
     2  // free software: you can redistribute it and/or modify it under the terms 
     3  // of the GNU Lesser General Public License as published by the Free 
     4  // Software Foundation, either version 3 of the License, or (at your option)
     5  // any later version.
     6  //
     7  // The go-sberex library is distributed in the hope that it will be useful, 
     8  // but WITHOUT ANY WARRANTY; without even the implied warranty of
     9  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
    10  // General Public License <http://www.gnu.org/licenses/> for more details.
    11  
    12  package vm
    13  
    14  import (
    15  	"fmt"
    16  
    17  	"github.com/Sberex/go-sberex/params"
    18  )
    19  
    20  func makeStackFunc(pop, push int) stackValidationFunc {
    21  	return func(stack *Stack) error {
    22  		if err := stack.require(pop); err != nil {
    23  			return err
    24  		}
    25  
    26  		if stack.len()+push-pop > int(params.StackLimit) {
    27  			return fmt.Errorf("stack limit reached %d (%d)", stack.len(), params.StackLimit)
    28  		}
    29  		return nil
    30  	}
    31  }
    32  
    33  func makeDupStackFunc(n int) stackValidationFunc {
    34  	return makeStackFunc(n, n+1)
    35  }
    36  
    37  func makeSwapStackFunc(n int) stackValidationFunc {
    38  	return makeStackFunc(n, n)
    39  }