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evm.go
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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 evm
import (
"math/big"
"github.com/hpb-project/go-hpb/blockchain/types"
"github.com/hpb-project/go-hpb/common"
"github.com/hpb-project/go-hpb/evm/vm"
. "github.com/hpb-project/go-hpb/vmcore"
)
// NewEVMBlockContext creates a new context for use in the EVM.
func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common.Address) vm.BlockContext {
var (
beneficiary common.Address
)
// If we don't have an explicit author (i.e. not mining), extract from the header
if author == nil {
beneficiary, _ = chain.Engine().Author(header) // Ignore error, we're past header validation
} else {
beneficiary = *author
}
extra, _ := types.BytesToExtraDetail(header.Extra)
return vm.BlockContext{
CanTransfer: CanTransfer,
Transfer: Transfer,
GetHash: GetHashFn(header, chain),
Coinbase: beneficiary,
BlockNumber: new(big.Int).Set(header.Number),
Time: new(big.Int).Set(header.Time),
Difficulty: new(big.Int).Set(header.Difficulty),
GasLimit: header.GasLimit.Uint64(),
Random: extra.GetSignedLastRND()[:32],
}
}
// NewEVMTxContext creates a new transaction context for a single transaction.
func NewEVMTxContext(msg Message) vm.TxContext {
return vm.TxContext{
Origin: msg.From(),
GasPrice: new(big.Int).Set(msg.GasPrice()),
}
}