github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/core/vm/interface.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  	"math/big"
    16  
    17  	"github.com/Sberex/go-sberex/common"
    18  	"github.com/Sberex/go-sberex/core/types"
    19  )
    20  
    21  // StateDB is an EVM database for full state querying.
    22  type StateDB interface {
    23  	CreateAccount(common.Address)
    24  
    25  	SubBalance(common.Address, *big.Int)
    26  	AddBalance(common.Address, *big.Int)
    27  	GetBalance(common.Address) *big.Int
    28  
    29  	GetNonce(common.Address) uint64
    30  	SetNonce(common.Address, uint64)
    31  
    32  	GetCodeHash(common.Address) common.Hash
    33  	GetCode(common.Address) []byte
    34  	SetCode(common.Address, []byte)
    35  	GetCodeSize(common.Address) int
    36  
    37  	AddRefund(uint64)
    38  	GetRefund() uint64
    39  
    40  	GetState(common.Address, common.Hash) common.Hash
    41  	SetState(common.Address, common.Hash, common.Hash)
    42  
    43  	Suicide(common.Address) bool
    44  	HasSuicided(common.Address) bool
    45  
    46  	// Exist reports whether the given account exists in state.
    47  	// Notably this should also return true for suicided accounts.
    48  	Exist(common.Address) bool
    49  	// Empty returns whether the given account is empty. Empty
    50  	// is defined according to EIP161 (balance = nonce = code = 0).
    51  	Empty(common.Address) bool
    52  
    53  	RevertToSnapshot(int)
    54  	Snapshot() int
    55  
    56  	AddLog(*types.Log)
    57  	AddPreimage(common.Hash, []byte)
    58  
    59  	ForEachStorage(common.Address, func(common.Hash, common.Hash) bool)
    60  }
    61  
    62  // CallContext provides a basic interface for the EVM calling conventions. The EVM
    63  // depends on this context being implemented for doing subcalls and initialising new EVM contracts.
    64  type CallContext interface {
    65  	// Call another contract
    66  	Call(env *EVM, me ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
    67  	// Take another's contract code and execute within our own context
    68  	CallCode(env *EVM, me ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
    69  	// Same as CallCode except sender and value is propagated from parent to child scope
    70  	DelegateCall(env *EVM, me ContractRef, addr common.Address, data []byte, gas *big.Int) ([]byte, error)
    71  	// Create a new contract
    72  	Create(env *EVM, me ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)
    73  }