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evm.go
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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"math/big"
"github.com/AlayaNetwork/Alaya-Go/x/xutil"
"github.com/AlayaNetwork/Alaya-Go/common"
"github.com/AlayaNetwork/Alaya-Go/consensus"
"github.com/AlayaNetwork/Alaya-Go/core/types"
"github.com/AlayaNetwork/Alaya-Go/core/vm"
)
// ChainContext supports retrieving headers and consensus parameters from the
// current blockchain to be used during transaction processing.
type ChainContext interface {
// Engine retrieves the chain's consensus engine.
Engine() consensus.Engine
// GetHeader returns the hash corresponding to their hash.
GetHeader(common.Hash, uint64) *types.Header
}
// NewEVMContext creates a new context for use in the EVM.
func NewEVMContext(msg Message, header *types.Header, chain ChainContext) vm.Context {
beneficiary := header.Coinbase // we're must using header validation
blockHash := common.ZeroHash
// store the sign in header.Extra[32:97]
if !xutil.IsWorker(header.Extra) {
blockHash = header.CacheHash()
}
return vm.Context{
CanTransfer: CanTransfer,
Transfer: Transfer,
GetHash: GetHashFn(header, chain),
GetNonce: GetNonceFn(header, chain),
Origin: msg.From(),
Coinbase: beneficiary,
BlockNumber: new(big.Int).Set(header.Number),
Time: new(big.Int).SetUint64(header.Time),
GasLimit: header.GasLimit,
GasPrice: new(big.Int).Set(msg.GasPrice()),
BlockHash: blockHash,
Difficulty: new(big.Int).SetUint64(0), // This one must not be deleted, otherwise the solidity contract will be failed
Nonce: header.Nonce,
ParentHash: header.ParentHash,
}
}
// GetHashFn returns a GetHashFunc which retrieves header hashes by number
func GetHashFn(ref *types.Header, chain ChainContext) func(n uint64) common.Hash {
// Cache will initially contain [refHash.parent],
// Then fill up with [refHash.p, refHash.pp, refHash.ppp, ...]
var cache []common.Hash
return func(n uint64) common.Hash {
// If there's no hash cache yet, make one
if len(cache) == 0 {
cache = append(cache, ref.ParentHash)
}
if idx := ref.Number.Uint64() - n - 1; idx < uint64(len(cache)) {
return cache[idx]
}
// No luck in the cache, but we can start iterating from the last element we already know
lastKnownHash := cache[len(cache)-1]
lastKnownNumber := ref.Number.Uint64() - uint64(len(cache))
for {
block := chain.Engine().GetBlockByHashAndNum(lastKnownHash, lastKnownNumber)
if block == nil {
break
}
header := block.Header()
cache = append(cache, header.ParentHash)
lastKnownHash = header.ParentHash
lastKnownNumber = header.Number.Uint64() - 1
if n == lastKnownNumber {
return lastKnownHash
}
}
return common.Hash{}
}
}
func GetNonceFn(ref *types.Header, chain ChainContext) func(n uint64) []byte {
var cache map[uint64][]byte
return func(n uint64) []byte {
// If there's no hash cache yet, make one
if cache == nil {
cache = map[uint64][]byte{
ref.Number.Uint64() - 1: ref.Nonce.Bytes(),
}
}
// Try to fulfill the request from the cache
if nonce, ok := cache[n]; ok {
return nonce
}
for block := chain.Engine().GetBlockByHashAndNum(ref.ParentHash, ref.Number.Uint64()-1); block != nil; block = chain.Engine().GetBlockByHashAndNum(block.Header().ParentHash, block.Header().Number.Uint64()-1) {
cache[block.Header().Number.Uint64()-1] = block.Header().Nonce.Bytes()
if n == block.Header().Number.Uint64()-1 {
return block.Header().Nonce.Bytes()
}
}
return nil
}
}
// CanTransfer checks whether there are enough funds in the address' account to make a transfer.
// This does not take the necessary gas in to account to make the transfer valid.
func CanTransfer(db vm.StateDB, addr common.Address, amount *big.Int) bool {
return db.GetBalance(addr).Cmp(amount) >= 0
}
// Transfer subtracts amount from sender and adds amount to recipient using the given Db
func Transfer(db vm.StateDB, sender, recipient common.Address, amount *big.Int) {
db.SubBalance(sender, amount)
db.AddBalance(recipient, amount)
}