7c7692933c
* Renamed ChainManager to BlockChain * Checkpointing is no longer required and never really properly worked when the state was corrupted.
127 lines
3.5 KiB
Go
127 lines
3.5 KiB
Go
// Copyright 2014 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 vm
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
)
|
|
|
|
// ContractRef is a reference to the contract's backing object
|
|
type ContractRef interface {
|
|
ReturnGas(*big.Int, *big.Int)
|
|
Address() common.Address
|
|
SetCode([]byte)
|
|
}
|
|
|
|
// Contract represents an ethereum contract in the state database. It contains
|
|
// the the contract code, calling arguments. Contract implements ContractReg
|
|
type Contract struct {
|
|
caller ContractRef
|
|
self ContractRef
|
|
|
|
jumpdests destinations // result of JUMPDEST analysis.
|
|
|
|
Code []byte
|
|
Input []byte
|
|
CodeAddr *common.Address
|
|
|
|
value, Gas, UsedGas, Price *big.Int
|
|
|
|
Args []byte
|
|
}
|
|
|
|
// Create a new context for the given data items.
|
|
func NewContract(caller ContractRef, object ContractRef, value, gas, price *big.Int) *Contract {
|
|
c := &Contract{caller: caller, self: object, Args: nil}
|
|
|
|
if parent, ok := caller.(*Contract); ok {
|
|
// Reuse JUMPDEST analysis from parent context if available.
|
|
c.jumpdests = parent.jumpdests
|
|
} else {
|
|
c.jumpdests = make(destinations)
|
|
}
|
|
|
|
// Gas should be a pointer so it can safely be reduced through the run
|
|
// This pointer will be off the state transition
|
|
c.Gas = gas //new(big.Int).Set(gas)
|
|
c.value = new(big.Int).Set(value)
|
|
// In most cases price and value are pointers to transaction objects
|
|
// and we don't want the transaction's values to change.
|
|
c.Price = new(big.Int).Set(price)
|
|
c.UsedGas = new(big.Int)
|
|
|
|
return c
|
|
}
|
|
|
|
// GetOp returns the n'th element in the contract's byte array
|
|
func (c *Contract) GetOp(n uint64) OpCode {
|
|
return OpCode(c.GetByte(n))
|
|
}
|
|
|
|
// GetByte returns the n'th byte in the contract's byte array
|
|
func (c *Contract) GetByte(n uint64) byte {
|
|
if n < uint64(len(c.Code)) {
|
|
return c.Code[n]
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// Return returns the given ret argument and returns any remaining gas to the
|
|
// caller
|
|
func (c *Contract) Return(ret []byte) []byte {
|
|
// Return the remaining gas to the caller
|
|
c.caller.ReturnGas(c.Gas, c.Price)
|
|
|
|
return ret
|
|
}
|
|
|
|
// UseGas attempts the use gas and subtracts it and returns true on success
|
|
func (c *Contract) UseGas(gas *big.Int) (ok bool) {
|
|
ok = useGas(c.Gas, gas)
|
|
if ok {
|
|
c.UsedGas.Add(c.UsedGas, gas)
|
|
}
|
|
return
|
|
}
|
|
|
|
// ReturnGas adds the given gas back to itself.
|
|
func (c *Contract) ReturnGas(gas, price *big.Int) {
|
|
// Return the gas to the context
|
|
c.Gas.Add(c.Gas, gas)
|
|
c.UsedGas.Sub(c.UsedGas, gas)
|
|
}
|
|
|
|
// Address returns the contracts address
|
|
func (c *Contract) Address() common.Address {
|
|
return c.self.Address()
|
|
}
|
|
|
|
// SetCode sets the code to the contract
|
|
func (self *Contract) SetCode(code []byte) {
|
|
self.Code = code
|
|
}
|
|
|
|
// SetCallCode sets the code of the contract and address of the backing data
|
|
// object
|
|
func (self *Contract) SetCallCode(addr *common.Address, code []byte) {
|
|
self.Code = code
|
|
self.CodeAddr = addr
|
|
}
|