mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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7a5b571c67
This implements a generic approach to enabling soft forks by allowing anyone to put in hashes of contracts that should not be interacted from. This will help "The DAO" in their endevour to stop any whithdrawals from any DAO contract by convincing the mining community to accept their code hash.
138 lines
5.0 KiB
Go
138 lines
5.0 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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)
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var IllegalCodeHashes map[common.Hash]struct{}
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// GetHashFn returns a function for which the VM env can query block hashes through
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// up to the limit defined by the Yellow Paper and uses the given block chain
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// to query for information.
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func GetHashFn(ref common.Hash, chain *BlockChain) func(n uint64) common.Hash {
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return func(n uint64) common.Hash {
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for block := chain.GetBlockByHash(ref); block != nil; block = chain.GetBlock(block.ParentHash(), block.NumberU64()-1) {
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if block.NumberU64() == n {
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return block.Hash()
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}
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}
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return common.Hash{}
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}
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}
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type VMEnv struct {
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chainConfig *ChainConfig // Chain configuration
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state *state.StateDB // State to use for executing
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evm *vm.EVM // The Ethereum Virtual Machine
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depth int // Current execution depth
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msg Message // Message appliod
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CodeHashes []common.Hash // code hashes collected during execution
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header *types.Header // Header information
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chain *BlockChain // Blockchain handle
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logs []vm.StructLog // Logs for the custom structured logger
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getHashFn func(uint64) common.Hash // getHashFn callback is used to retrieve block hashes
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}
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func NewEnv(state *state.StateDB, chainConfig *ChainConfig, chain *BlockChain, msg Message, header *types.Header, cfg vm.Config) *VMEnv {
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env := &VMEnv{
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chainConfig: chainConfig,
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chain: chain,
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state: state,
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header: header,
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msg: msg,
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getHashFn: GetHashFn(header.ParentHash, chain),
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}
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// if no log collector is present set self as the collector
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if cfg.Logger.Collector == nil {
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cfg.Logger.Collector = env
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}
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env.evm = vm.New(env, cfg)
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return env
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}
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func (self *VMEnv) MarkCodeHash(hash common.Hash) { self.CodeHashes = append(self.CodeHashes, hash) }
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func (self *VMEnv) RuleSet() vm.RuleSet { return self.chainConfig }
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func (self *VMEnv) Vm() vm.Vm { return self.evm }
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func (self *VMEnv) Origin() common.Address { f, _ := self.msg.From(); return f }
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func (self *VMEnv) BlockNumber() *big.Int { return self.header.Number }
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func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase }
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func (self *VMEnv) Time() *big.Int { return self.header.Time }
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func (self *VMEnv) Difficulty() *big.Int { return self.header.Difficulty }
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func (self *VMEnv) GasLimit() *big.Int { return self.header.GasLimit }
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func (self *VMEnv) Value() *big.Int { return self.msg.Value() }
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func (self *VMEnv) Db() vm.Database { return self.state }
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func (self *VMEnv) Depth() int { return self.depth }
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func (self *VMEnv) SetDepth(i int) { self.depth = i }
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func (self *VMEnv) GetHash(n uint64) common.Hash {
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return self.getHashFn(n)
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}
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func (self *VMEnv) AddLog(log *vm.Log) {
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self.state.AddLog(log)
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}
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func (self *VMEnv) CanTransfer(from common.Address, balance *big.Int) bool {
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return self.state.GetBalance(from).Cmp(balance) >= 0
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}
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func (self *VMEnv) MakeSnapshot() vm.Database {
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return self.state.Copy()
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}
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func (self *VMEnv) SetSnapshot(copy vm.Database) {
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self.state.Set(copy.(*state.StateDB))
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}
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func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) {
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Transfer(from, to, amount)
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}
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func (self *VMEnv) Call(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return Call(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) CallCode(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return CallCode(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
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return DelegateCall(self, me, addr, data, gas, price)
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}
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func (self *VMEnv) Create(me vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
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return Create(self, me, data, gas, price, value)
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}
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func (self *VMEnv) StructLogs() []vm.StructLog {
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return self.logs
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}
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func (self *VMEnv) AddStructLog(log vm.StructLog) {
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self.logs = append(self.logs, log)
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}
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