mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-08-19 18:32:23 +00:00
321 lines
8.5 KiB
Go
321 lines
8.5 KiB
Go
// Copyright 2018 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 vm
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import (
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"bytes"
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"fmt"
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"math/big"
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"os"
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"strings"
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"sync"
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"github.com/ethereum/evmc/bindings/go/evmc"
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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/log"
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"github.com/ethereum/go-ethereum/params"
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)
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type EVMC struct {
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instance *evmc.Instance
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env *EVM
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readOnly bool // TODO: The readOnly flag should not be here.
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}
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var (
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createMu sync.Mutex
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evmcInstance *evmc.Instance
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)
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func createVM(path string, options []string) *evmc.Instance {
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createMu.Lock()
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defer createMu.Unlock()
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if evmcInstance == nil {
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vmPath := os.Getenv("EVMC_PATH")
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if len(vmPath) == 0 {
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vmPath = path
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}
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if len(vmPath) == 0 {
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panic("EVMC VM path not provided, set EVMC_PATH environment variable or --vm.evm option")
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}
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var err error
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evmcInstance, err = evmc.Load(vmPath)
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if err != nil {
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panic(err.Error())
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}
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log.Info("EVMC VM loaded", "name", evmcInstance.Name(), "version", evmcInstance.Version(), "path", vmPath)
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opts := strings.Split(os.Getenv("EVMC_OPTIONS"), " ")
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opts = append(opts, options...)
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for _, option := range opts {
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if idx := strings.Index(option, "="); idx >= 0 {
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name := option[:idx]
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value := option[idx+1:]
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err := evmcInstance.SetOption(name, value)
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if err == nil {
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log.Info("EVMC VM option set", "name", name, "value", value)
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} else {
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log.Warn("EVMC VM option setting failed", "name", name, "error", err)
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}
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}
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}
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}
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return evmcInstance
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}
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func NewEVMC(path string, options []string, env *EVM) *EVMC {
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return &EVMC{createVM(path, options), env, false}
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}
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// Implements evmc.HostContext interface.
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type HostContext struct {
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env *EVM
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contract *Contract
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}
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func (host *HostContext) AccountExists(addr common.Address) bool {
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env := host.env
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eip158 := env.ChainConfig().IsEIP158(env.BlockNumber)
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if eip158 {
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if !env.StateDB.Empty(addr) {
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return true
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}
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} else if env.StateDB.Exist(addr) {
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return true
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}
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return false
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}
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func (host *HostContext) GetStorage(addr common.Address, key common.Hash) common.Hash {
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env := host.env
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return env.StateDB.GetState(addr, key)
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}
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func (host *HostContext) SetStorage(addr common.Address, key common.Hash, value common.Hash) (status evmc.StorageStatus) {
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env := host.env
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oldValue := env.StateDB.GetState(addr, key)
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if oldValue == value {
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return evmc.StorageUnchanged
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}
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env.StateDB.SetState(addr, key, value)
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zero := common.Hash{}
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status = evmc.StorageModified
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if oldValue == zero {
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return evmc.StorageAdded
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} else if value == zero {
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env.StateDB.AddRefund(params.SstoreRefundGas)
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return evmc.StorageDeleted
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}
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return evmc.StorageModified
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}
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func (host *HostContext) GetBalance(addr common.Address) common.Hash {
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env := host.env
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balance := env.StateDB.GetBalance(addr)
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return common.BigToHash(balance)
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}
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func (host *HostContext) GetCodeSize(addr common.Address) int {
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env := host.env
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return env.StateDB.GetCodeSize(addr)
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}
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func (host *HostContext) GetCodeHash(addr common.Address) common.Hash {
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env := host.env
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return env.StateDB.GetCodeHash(addr)
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}
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func (host *HostContext) GetCode(addr common.Address) []byte {
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env := host.env
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return env.StateDB.GetCode(addr)
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}
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func (host *HostContext) Selfdestruct(addr common.Address, beneficiary common.Address) {
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env := host.env
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db := env.StateDB
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if !db.HasSuicided(addr) {
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db.AddRefund(params.SuicideRefundGas)
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}
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balance := db.GetBalance(addr)
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db.AddBalance(beneficiary, balance)
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db.Suicide(addr)
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}
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func (host *HostContext) GetTxContext() (gasPrice common.Hash, origin common.Address, coinbase common.Address,
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number int64, timestamp int64, gasLimit int64, difficulty common.Hash) {
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env := host.env
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gasPrice = common.BigToHash(env.GasPrice)
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origin = env.Origin
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coinbase = env.Coinbase
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number = env.BlockNumber.Int64()
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timestamp = env.Time.Int64()
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gasLimit = int64(env.GasLimit)
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difficulty = common.BigToHash(env.Difficulty)
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return gasPrice, origin, coinbase, number, timestamp, gasLimit, difficulty
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}
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func (host *HostContext) GetBlockHash(number int64) common.Hash {
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env := host.env
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b := env.BlockNumber.Int64()
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if number >= (b-256) && number < b {
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return env.GetHash(uint64(number))
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}
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return common.Hash{}
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}
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func (host *HostContext) EmitLog(addr common.Address, topics []common.Hash, data []byte) {
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env := host.env
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env.StateDB.AddLog(&types.Log{
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Address: addr,
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Topics: topics,
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Data: data,
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BlockNumber: env.BlockNumber.Uint64(),
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})
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}
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func (host *HostContext) Call(kind evmc.CallKind,
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destination common.Address, sender common.Address, value *big.Int, input []byte, gas int64, depth int,
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static bool) (output []byte, gasLeft int64, createAddr common.Address, err error) {
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env := host.env
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gasU := uint64(gas)
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var gasLeftU uint64
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switch kind {
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case evmc.Call:
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if static {
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output, gasLeftU, err = env.StaticCall(host.contract, destination, input, gasU)
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} else {
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output, gasLeftU, err = env.Call(host.contract, destination, input, gasU, value)
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}
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case evmc.DelegateCall:
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output, gasLeftU, err = env.DelegateCall(host.contract, destination, input, gasU)
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case evmc.CallCode:
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output, gasLeftU, err = env.CallCode(host.contract, destination, input, gasU, value)
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case evmc.Create:
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var createOutput []byte
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createOutput, createAddr, gasLeftU, err = env.Create(host.contract, input, gasU, value)
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isHomestead := env.ChainConfig().IsHomestead(env.BlockNumber)
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if !isHomestead && err == ErrCodeStoreOutOfGas {
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err = nil
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}
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if err == errExecutionReverted {
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// Assign return buffer from REVERT.
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// TODO: Bad API design: return data buffer and the code is returned in the same place. In worst case
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// the code is returned also when there is not enough funds to deploy the code.
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output = createOutput
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}
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}
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// Map errors.
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if err == errExecutionReverted {
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err = evmc.Revert
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} else if err != nil {
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err = evmc.Failure
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}
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gasLeft = int64(gasLeftU)
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return output, gasLeft, createAddr, err
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}
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func getRevision(env *EVM) evmc.Revision {
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n := env.BlockNumber
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conf := env.ChainConfig()
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if conf.IsConstantinople(n) {
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return evmc.Constantinople
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}
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if conf.IsByzantium(n) {
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return evmc.Byzantium
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}
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if conf.IsEIP158(n) {
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return evmc.SpuriousDragon
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}
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if conf.IsEIP150(n) {
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return evmc.TangerineWhistle
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}
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if conf.IsHomestead(n) {
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return evmc.Homestead
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}
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return evmc.Frontier
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}
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func (evm *EVMC) Run(contract *Contract, input []byte, readOnly bool) (ret []byte, err error) {
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evm.env.depth++
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defer func() { evm.env.depth-- }()
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// Don't bother with the execution if there's no code.
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if len(contract.Code) == 0 {
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return nil, nil
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}
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kind := evmc.Call
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if evm.env.StateDB.GetCodeSize(contract.Address()) == 0 {
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// Guess if this is a CREATE.
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kind = evmc.Create
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}
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// Make sure the readOnly is only set if we aren't in readOnly yet.
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// This makes also sure that the readOnly flag isn't removed for child calls.
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if readOnly && !evm.readOnly {
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evm.readOnly = true
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defer func() { evm.readOnly = false }()
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}
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output, gasLeft, err := evm.instance.Execute(
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&HostContext{evm.env, contract},
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getRevision(evm.env),
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kind,
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evm.readOnly,
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evm.env.depth-1,
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int64(contract.Gas),
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contract.Address(),
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contract.Caller(),
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input,
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common.BigToHash(contract.value),
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contract.Code,
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common.Hash{})
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contract.Gas = uint64(gasLeft)
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if err == evmc.Revert {
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err = errExecutionReverted
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} else if evmcError, ok := err.(evmc.Error); ok && evmcError.IsInternalError() {
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panic(fmt.Sprintf("EVMC VM internal error: %s", evmcError.Error()))
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}
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return output, err
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}
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func (evm *EVMC) CanRun(code []byte) bool {
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cap := evmc.CapabilityEVM1
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wasmPreamble := []byte("\x00asm\x01\x00\x00\x00")
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if (bytes.HasPrefix(code, wasmPreamble)) {
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cap = evmc.CapabilityEWASM
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}
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// FIXME: Optimize. Access capabilities once.
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return evm.instance.HasCapability(cap)
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}
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