runtime

Documentation

Overview

Package runtime provides a basic execution model for executing EVM code.

Index

• func Call(address common.Address, input []byte, cfg *Config) ([]byte, error)
• func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error)
• func NewEnv(cfg *Config, state *state.StateDB) vm.Environment
• type Config
• type Env
  • func (self *Env) AddLog(log *vm.Log)
  • func (self *Env) BlockNumber() *big.Int
  • func (self *Env) Call(caller vm.ContractRef, addr common.Address, data []byte, ...) ([]byte, error)
  • func (self *Env) CallCode(caller vm.ContractRef, addr common.Address, data []byte, ...) ([]byte, error)
  • func (self *Env) CanTransfer(from common.Address, balance *big.Int) bool
  • func (self *Env) Coinbase() common.Address
  • func (self *Env) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error)
  • func (self *Env) Db() vm.Database
  • func (self *Env) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)
  • func (self *Env) Depth() int
  • func (self *Env) Difficulty() *big.Int
  • func (self *Env) GasLimit() *big.Int
  • func (self *Env) GetHash(n uint64) common.Hash
  • func (self *Env) Origin() common.Address
  • func (self *Env) ReturnData() []byte
  • func (self *Env) RevertToSnapshot(snapshot int)
  • func (self *Env) RuleSet() vm.RuleSet
  • func (self *Env) SetDepth(i int)
  • func (self *Env) SetReturnData(data []byte)
  • func (self *Env) SnapshotDatabase() int
  • func (self *Env) StaticCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)
  • func (self *Env) Time() *big.Int
  • func (self *Env) Transfer(from, to vm.Account, amount *big.Int)
  • func (self *Env) Vm() vm.Vm
  • func (self *Env) VmType() vm.Type

Examples

• Execute

Functions

func Call

func Call(address common.Address, input []byte, cfg *Config) ([]byte, error)

Call executes the code given by the contract's address. It will return the EVM's return value or an error if it failed.

Call, unlike Execute, requires a config and also requires the State field to be set.

func Execute

func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error)

Execute executes the code using the input as call data during the execution. It returns the EVM's return value, the new state and an error if it failed.

Executes sets up a in memory, temporarily, environment for the execution of the given code. It enabled the JIT by default and make sure that it's restored to it's original state afterwards.

Example

package main

import (
	"fmt"

	"github.com/webchain-network/webchaind/common"
	"github.com/webchain-network/webchaind/core/vm/runtime"
)

func main() {
	ret, _, err := runtime.Execute(common.Hex2Bytes("6060604052600a8060106000396000f360606040526008565b00"), nil, nil)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(ret)
}

Output:

[96 96 96 64 82 96 8 86 91 0]

func NewEnv

func NewEnv(cfg *Config, state *state.StateDB) vm.Environment

NewEnv returns a new vm.Environment

Types

type Config

type Config struct {
	RuleSet     vm.RuleSet
	Difficulty  *big.Int
	Origin      common.Address
	Coinbase    common.Address
	BlockNumber *big.Int
	Time        *big.Int
	GasLimit    *big.Int
	GasPrice    *big.Int
	Value       *big.Int
	DisableJit  bool // "disable" so it's enabled by default
	Debug       bool

	State     *state.StateDB
	GetHashFn func(n uint64) common.Hash
}

Config is a basic type specifying certain configuration flags for running the EVM.

type Env

type Env struct {
	// contains filtered or unexported fields
}

Env is a basic runtime environment required for running the EVM.

func (*Env) AddLog

func (self *Env) AddLog(log *vm.Log)

func (*Env) BlockNumber

func (self *Env) BlockNumber() *big.Int

func (*Env) Call

func (self *Env) Call(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)

func (*Env) CallCode

func (self *Env) CallCode(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)

func (*Env) CanTransfer

func (self *Env) CanTransfer(from common.Address, balance *big.Int) bool

func (*Env) Coinbase

func (self *Env) Coinbase() common.Address

func (*Env) Create

func (self *Env) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error)

func (*Env) Db

func (self *Env) Db() vm.Database

func (*Env) DelegateCall

func (self *Env) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)

func (*Env) Depth

func (self *Env) Depth() int

func (*Env) Difficulty

func (self *Env) Difficulty() *big.Int

func (*Env) GasLimit

func (self *Env) GasLimit() *big.Int

func (*Env) GetHash

func (self *Env) GetHash(n uint64) common.Hash

func (*Env) Origin

func (self *Env) Origin() common.Address

func (*Env) ReturnData

func (self *Env) ReturnData() []byte

func (*Env) RevertToSnapshot

func (self *Env) RevertToSnapshot(snapshot int)

func (*Env) RuleSet

func (self *Env) RuleSet() vm.RuleSet

func (*Env) SetDepth

func (self *Env) SetDepth(i int)

func (*Env) SetReturnData

func (self *Env) SetReturnData(data []byte)

func (*Env) SnapshotDatabase

func (self *Env) SnapshotDatabase() int

func (*Env) StaticCall

func (self *Env) StaticCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)

func (*Env) Time

func (self *Env) Time() *big.Int

func (*Env) Transfer

func (self *Env) Transfer(from, to vm.Account, amount *big.Int)

func (*Env) Vm

func (self *Env) Vm() vm.Vm

func (*Env) VmType

func (self *Env) VmType() vm.Type