204 lines
6.2 KiB
Go
204 lines
6.2 KiB
Go
// Copyright 2016 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 light
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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/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"golang.org/x/net/context"
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)
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// VMState is a wrapper for the light state that holds the actual context and
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// passes it to any state operation that requires it.
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type VMState struct {
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ctx context.Context
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state *LightState
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snapshots []*LightState
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err error
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}
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func NewVMState(ctx context.Context, state *LightState) *VMState {
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return &VMState{ctx: ctx, state: state}
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}
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func (s *VMState) Error() error {
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return s.err
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}
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func (s *VMState) AddLog(log *types.Log) {}
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func (s *VMState) AddPreimage(hash common.Hash, preimage []byte) {}
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// errHandler handles and stores any state error that happens during execution.
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func (s *VMState) errHandler(err error) {
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if err != nil && s.err == nil {
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s.err = err
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}
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}
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func (self *VMState) Snapshot() int {
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self.snapshots = append(self.snapshots, self.state.Copy())
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return len(self.snapshots) - 1
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}
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func (self *VMState) RevertToSnapshot(idx int) {
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self.state.Set(self.snapshots[idx])
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self.snapshots = self.snapshots[:idx]
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}
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// GetAccount returns the account object of the given account or nil if the
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// account does not exist
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func (s *VMState) GetAccount(addr common.Address) vm.Account {
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so, err := s.state.GetStateObject(s.ctx, addr)
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s.errHandler(err)
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if err != nil {
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// return a dummy state object to avoid panics
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so = s.state.newStateObject(addr)
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}
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return so
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}
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// CreateAccount creates creates a new account object and takes ownership.
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func (s *VMState) CreateAccount(addr common.Address) vm.Account {
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so, err := s.state.CreateStateObject(s.ctx, addr)
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s.errHandler(err)
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if err != nil {
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// return a dummy state object to avoid panics
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so = s.state.newStateObject(addr)
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}
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return so
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}
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// AddBalance adds the given amount to the balance of the specified account
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func (s *VMState) AddBalance(addr common.Address, amount *big.Int) {
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err := s.state.AddBalance(s.ctx, addr, amount)
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s.errHandler(err)
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}
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// SubBalance adds the given amount to the balance of the specified account
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func (s *VMState) SubBalance(addr common.Address, amount *big.Int) {
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err := s.state.SubBalance(s.ctx, addr, amount)
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s.errHandler(err)
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}
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// GetBalance retrieves the balance from the given address or 0 if the account does
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// not exist
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func (s *VMState) GetBalance(addr common.Address) *big.Int {
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res, err := s.state.GetBalance(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// GetNonce returns the nonce at the given address or 0 if the account does
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// not exist
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func (s *VMState) GetNonce(addr common.Address) uint64 {
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res, err := s.state.GetNonce(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// SetNonce sets the nonce of the specified account
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func (s *VMState) SetNonce(addr common.Address, nonce uint64) {
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err := s.state.SetNonce(s.ctx, addr, nonce)
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s.errHandler(err)
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}
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// GetCode returns the contract code at the given address or nil if the account
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// does not exist
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func (s *VMState) GetCode(addr common.Address) []byte {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// GetCodeHash returns the contract code hash at the given address
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func (s *VMState) GetCodeHash(addr common.Address) common.Hash {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return crypto.Keccak256Hash(res)
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}
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// GetCodeSize returns the contract code size at the given address
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func (s *VMState) GetCodeSize(addr common.Address) int {
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res, err := s.state.GetCode(s.ctx, addr)
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s.errHandler(err)
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return len(res)
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}
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// SetCode sets the contract code at the specified account
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func (s *VMState) SetCode(addr common.Address, code []byte) {
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err := s.state.SetCode(s.ctx, addr, code)
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s.errHandler(err)
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}
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// AddRefund adds an amount to the refund value collected during a vm execution
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func (s *VMState) AddRefund(gas *big.Int) {
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s.state.AddRefund(gas)
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}
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// GetRefund returns the refund value collected during a vm execution
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func (s *VMState) GetRefund() *big.Int {
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return s.state.GetRefund()
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}
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// GetState returns the contract storage value at storage address b from the
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// contract address a or common.Hash{} if the account does not exist
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func (s *VMState) GetState(a common.Address, b common.Hash) common.Hash {
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res, err := s.state.GetState(s.ctx, a, b)
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s.errHandler(err)
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return res
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}
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// SetState sets the storage value at storage address key of the account addr
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func (s *VMState) SetState(addr common.Address, key common.Hash, value common.Hash) {
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err := s.state.SetState(s.ctx, addr, key, value)
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s.errHandler(err)
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}
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// Suicide marks an account to be removed and clears its balance
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func (s *VMState) Suicide(addr common.Address) bool {
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res, err := s.state.Suicide(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// Exist returns true if an account exists at the given address
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func (s *VMState) Exist(addr common.Address) bool {
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res, err := s.state.HasAccount(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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// Empty returns true if the account at the given address is considered empty
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func (s *VMState) Empty(addr common.Address) bool {
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so, err := s.state.GetStateObject(s.ctx, addr)
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s.errHandler(err)
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return so == nil || so.empty()
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}
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// HasSuicided returns true if the given account has been marked for deletion
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// or false if the account does not exist
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func (s *VMState) HasSuicided(addr common.Address) bool {
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res, err := s.state.HasSuicided(s.ctx, addr)
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s.errHandler(err)
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return res
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}
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