3fc7c97827
Environment is now a struct (not an interface). This reduces a lot of tech-debt throughout the codebase where a virtual machine environment had to be implemented in order to test or run it. The new environment is suitable to be used en the json tests, core consensus and light client.
468 lines
14 KiB
Go
468 lines
14 KiB
Go
// Copyright 2014 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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"fmt"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/params"
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)
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// Config are the configuration options for the EVM
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type Config struct {
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// Debug enabled debugging EVM options
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Debug bool
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// EnableJit enabled the JIT VM
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EnableJit bool
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// ForceJit forces the JIT VM
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ForceJit bool
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// Tracer is the op code logger
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Tracer Tracer
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// NoRecursion disabled EVM call, callcode,
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// delegate call and create.
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NoRecursion bool
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}
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// EVM is used to run Ethereum based contracts and will utilise the
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// passed environment to query external sources for state information.
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// The EVM will run the byte code VM or JIT VM based on the passed
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// configuration.
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type EVM struct {
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env *Environment
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jumpTable vmJumpTable
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cfg Config
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gasTable params.GasTable
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}
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// New returns a new instance of the EVM.
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func New(env *Environment, cfg Config) *EVM {
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return &EVM{
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env: env,
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jumpTable: newJumpTable(env.ChainConfig(), env.BlockNumber),
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cfg: cfg,
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gasTable: env.ChainConfig().GasTable(env.BlockNumber),
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}
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}
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// Run loops and evaluates the contract's code with the given input data
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func (evm *EVM) Run(contract *Contract, input []byte) (ret []byte, err error) {
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evm.env.Depth++
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defer func() { evm.env.Depth-- }()
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if contract.CodeAddr != nil {
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if p := Precompiled[contract.CodeAddr.Str()]; p != nil {
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return evm.RunPrecompiled(p, input, contract)
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}
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}
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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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codehash := contract.CodeHash // codehash is used when doing jump dest caching
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if codehash == (common.Hash{}) {
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codehash = crypto.Keccak256Hash(contract.Code)
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}
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var program *Program
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if false {
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// JIT disabled due to JIT not being Homestead gas reprice ready.
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// If the JIT is enabled check the status of the JIT program,
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// if it doesn't exist compile a new program in a separate
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// goroutine or wait for compilation to finish if the JIT is
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// forced.
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switch GetProgramStatus(codehash) {
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case progReady:
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return RunProgram(GetProgram(codehash), evm.env, contract, input)
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case progUnknown:
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if evm.cfg.ForceJit {
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// Create and compile program
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program = NewProgram(contract.Code)
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perr := CompileProgram(program)
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if perr == nil {
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return RunProgram(program, evm.env, contract, input)
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}
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glog.V(logger.Info).Infoln("error compiling program", err)
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} else {
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// create and compile the program. Compilation
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// is done in a separate goroutine
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program = NewProgram(contract.Code)
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go func() {
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err := CompileProgram(program)
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if err != nil {
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glog.V(logger.Info).Infoln("error compiling program", err)
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return
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}
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}()
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}
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}
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}
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var (
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caller = contract.caller
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code = contract.Code
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instrCount = 0
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op OpCode // current opcode
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mem = NewMemory() // bound memory
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stack = newstack() // local stack
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// For optimisation reason we're using uint64 as the program counter.
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// It's theoretically possible to go above 2^64. The YP defines the PC to be uint256. Practically much less so feasible.
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pc = uint64(0) // program counter
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// jump evaluates and checks whether the given jump destination is a valid one
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// if valid move the `pc` otherwise return an error.
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jump = func(from uint64, to *big.Int) error {
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if !contract.jumpdests.has(codehash, code, to) {
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nop := contract.GetOp(to.Uint64())
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return fmt.Errorf("invalid jump destination (%v) %v", nop, to)
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}
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pc = to.Uint64()
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return nil
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}
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newMemSize *big.Int
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cost *big.Int
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)
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contract.Input = input
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// User defer pattern to check for an error and, based on the error being nil or not, use all gas and return.
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defer func() {
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if err != nil && evm.cfg.Debug {
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evm.cfg.Tracer.CaptureState(evm.env, pc, op, contract.Gas, cost, mem, stack, contract, evm.env.Depth, err)
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}
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}()
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if glog.V(logger.Debug) {
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glog.Infof("running byte VM %x\n", codehash[:4])
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tstart := time.Now()
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defer func() {
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glog.Infof("byte VM %x done. time: %v instrc: %v\n", codehash[:4], time.Since(tstart), instrCount)
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}()
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}
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for ; ; instrCount++ {
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/*
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if EnableJit && it%100 == 0 {
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if program != nil && progStatus(atomic.LoadInt32(&program.status)) == progReady {
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// move execution
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fmt.Println("moved", it)
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glog.V(logger.Info).Infoln("Moved execution to JIT")
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return runProgram(program, pc, mem, stack, evm.env, contract, input)
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}
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}
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*/
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// Get the memory location of pc
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op = contract.GetOp(pc)
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//fmt.Printf("OP %d %v\n", op, op)
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// calculate the new memory size and gas price for the current executing opcode
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newMemSize, cost, err = calculateGasAndSize(evm.gasTable, evm.env, contract, caller, op, mem, stack)
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if err != nil {
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return nil, err
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}
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// Use the calculated gas. When insufficient gas is present, use all gas and return an
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// Out Of Gas error
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if !contract.UseGas(cost) {
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return nil, OutOfGasError
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}
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// Resize the memory calculated previously
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mem.Resize(newMemSize.Uint64())
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// Add a log message
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if evm.cfg.Debug {
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err = evm.cfg.Tracer.CaptureState(evm.env, pc, op, contract.Gas, cost, mem, stack, contract, evm.env.Depth, nil)
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if err != nil {
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return nil, err
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}
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}
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if opPtr := evm.jumpTable[op]; opPtr.valid {
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if opPtr.fn != nil {
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opPtr.fn(instruction{}, &pc, evm.env, contract, mem, stack)
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} else {
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switch op {
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case PC:
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opPc(instruction{data: new(big.Int).SetUint64(pc)}, &pc, evm.env, contract, mem, stack)
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case JUMP:
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if err := jump(pc, stack.pop()); err != nil {
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return nil, err
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}
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continue
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case JUMPI:
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pos, cond := stack.pop(), stack.pop()
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if cond.Cmp(common.BigTrue) >= 0 {
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if err := jump(pc, pos); err != nil {
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return nil, err
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}
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continue
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}
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case RETURN:
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offset, size := stack.pop(), stack.pop()
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ret := mem.GetPtr(offset.Int64(), size.Int64())
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return ret, nil
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case SUICIDE:
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opSuicide(instruction{}, nil, evm.env, contract, mem, stack)
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fallthrough
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case STOP: // Stop the contract
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return nil, nil
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}
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}
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} else {
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return nil, fmt.Errorf("Invalid opcode %x", op)
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}
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pc++
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}
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}
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// calculateGasAndSize calculates the required given the opcode and stack items calculates the new memorysize for
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// the operation. This does not reduce gas or resizes the memory.
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func calculateGasAndSize(gasTable params.GasTable, env *Environment, contract *Contract, caller ContractRef, op OpCode, mem *Memory, stack *Stack) (*big.Int, *big.Int, error) {
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var (
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gas = new(big.Int)
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newMemSize *big.Int = new(big.Int)
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)
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err := baseCheck(op, stack, gas)
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if err != nil {
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return nil, nil, err
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}
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// stack Check, memory resize & gas phase
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switch op {
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case SUICIDE:
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// EIP150 homestead gas reprice fork:
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if gasTable.CreateBySuicide != nil {
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gas.Set(gasTable.Suicide)
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var (
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address = common.BigToAddress(stack.data[len(stack.data)-1])
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eip158 = env.ChainConfig().IsEIP158(env.BlockNumber)
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)
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if eip158 {
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// if empty and transfers value
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if env.StateDB.Empty(address) && env.StateDB.GetBalance(contract.Address()).BitLen() > 0 {
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gas.Add(gas, gasTable.CreateBySuicide)
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}
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} else if !env.StateDB.Exist(address) {
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gas.Add(gas, gasTable.CreateBySuicide)
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}
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}
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if !env.StateDB.HasSuicided(contract.Address()) {
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env.StateDB.AddRefund(params.SuicideRefundGas)
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}
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case EXTCODESIZE:
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gas.Set(gasTable.ExtcodeSize)
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case BALANCE:
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gas.Set(gasTable.Balance)
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case SLOAD:
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gas.Set(gasTable.SLoad)
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case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
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n := int(op - SWAP1 + 2)
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err := stack.require(n)
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if err != nil {
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return nil, nil, err
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}
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gas.Set(GasFastestStep)
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case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
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n := int(op - DUP1 + 1)
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err := stack.require(n)
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if err != nil {
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return nil, nil, err
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}
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gas.Set(GasFastestStep)
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case LOG0, LOG1, LOG2, LOG3, LOG4:
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n := int(op - LOG0)
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err := stack.require(n + 2)
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if err != nil {
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return nil, nil, err
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}
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mSize, mStart := stack.data[stack.len()-2], stack.data[stack.len()-1]
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gas.Add(gas, params.LogGas)
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gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(n)), params.LogTopicGas))
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gas.Add(gas, new(big.Int).Mul(mSize, params.LogDataGas))
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newMemSize = calcMemSize(mStart, mSize)
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quadMemGas(mem, newMemSize, gas)
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case EXP:
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expByteLen := int64((stack.data[stack.len()-2].BitLen() + 7) / 8)
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gas.Add(gas, new(big.Int).Mul(big.NewInt(expByteLen), gasTable.ExpByte))
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case SSTORE:
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err := stack.require(2)
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if err != nil {
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return nil, nil, err
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}
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var g *big.Int
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y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
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val := env.StateDB.GetState(contract.Address(), common.BigToHash(x))
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// This checks for 3 scenario's and calculates gas accordingly
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// 1. From a zero-value address to a non-zero value (NEW VALUE)
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// 2. From a non-zero value address to a zero-value address (DELETE)
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// 3. From a non-zero to a non-zero (CHANGE)
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if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
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// 0 => non 0
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g = params.SstoreSetGas
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} else if !common.EmptyHash(val) && common.EmptyHash(common.BigToHash(y)) {
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env.StateDB.AddRefund(params.SstoreRefundGas)
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g = params.SstoreClearGas
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} else {
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// non 0 => non 0 (or 0 => 0)
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g = params.SstoreResetGas
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}
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gas.Set(g)
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case MLOAD:
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newMemSize = calcMemSize(stack.peek(), u256(32))
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quadMemGas(mem, newMemSize, gas)
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case MSTORE8:
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newMemSize = calcMemSize(stack.peek(), u256(1))
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quadMemGas(mem, newMemSize, gas)
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case MSTORE:
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newMemSize = calcMemSize(stack.peek(), u256(32))
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quadMemGas(mem, newMemSize, gas)
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case RETURN:
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newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
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quadMemGas(mem, newMemSize, gas)
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case SHA3:
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newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
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words := toWordSize(stack.data[stack.len()-2])
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gas.Add(gas, words.Mul(words, params.Sha3WordGas))
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quadMemGas(mem, newMemSize, gas)
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case CALLDATACOPY:
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newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
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words := toWordSize(stack.data[stack.len()-3])
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gas.Add(gas, words.Mul(words, params.CopyGas))
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quadMemGas(mem, newMemSize, gas)
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case CODECOPY:
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newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
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words := toWordSize(stack.data[stack.len()-3])
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gas.Add(gas, words.Mul(words, params.CopyGas))
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quadMemGas(mem, newMemSize, gas)
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case EXTCODECOPY:
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gas.Set(gasTable.ExtcodeCopy)
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newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-4])
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words := toWordSize(stack.data[stack.len()-4])
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gas.Add(gas, words.Mul(words, params.CopyGas))
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quadMemGas(mem, newMemSize, gas)
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case CREATE:
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newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-3])
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quadMemGas(mem, newMemSize, gas)
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case CALL, CALLCODE:
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gas.Set(gasTable.Calls)
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transfersValue := stack.data[len(stack.data)-3].BitLen() > 0
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if op == CALL {
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var (
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address = common.BigToAddress(stack.data[len(stack.data)-2])
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eip158 = env.ChainConfig().IsEIP158(env.BlockNumber)
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)
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if eip158 {
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if env.StateDB.Empty(address) && transfersValue {
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gas.Add(gas, params.CallNewAccountGas)
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}
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} else if !env.StateDB.Exist(address) {
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gas.Add(gas, params.CallNewAccountGas)
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}
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}
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if transfersValue {
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gas.Add(gas, params.CallValueTransferGas)
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}
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x := calcMemSize(stack.data[stack.len()-6], stack.data[stack.len()-7])
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y := calcMemSize(stack.data[stack.len()-4], stack.data[stack.len()-5])
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newMemSize = common.BigMax(x, y)
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quadMemGas(mem, newMemSize, gas)
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cg := callGas(gasTable, contract.Gas, gas, stack.data[stack.len()-1])
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// Replace the stack item with the new gas calculation. This means that
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// either the original item is left on the stack or the item is replaced by:
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// (availableGas - gas) * 63 / 64
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// We replace the stack item so that it's available when the opCall instruction is
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// called. This information is otherwise lost due to the dependency on *current*
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// available gas.
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stack.data[stack.len()-1] = cg
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gas.Add(gas, cg)
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case DELEGATECALL:
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gas.Set(gasTable.Calls)
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x := calcMemSize(stack.data[stack.len()-5], stack.data[stack.len()-6])
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y := calcMemSize(stack.data[stack.len()-3], stack.data[stack.len()-4])
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newMemSize = common.BigMax(x, y)
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quadMemGas(mem, newMemSize, gas)
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cg := callGas(gasTable, contract.Gas, gas, stack.data[stack.len()-1])
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// Replace the stack item with the new gas calculation. This means that
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// either the original item is left on the stack or the item is replaced by:
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// (availableGas - gas) * 63 / 64
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// We replace the stack item so that it's available when the opCall instruction is
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// called.
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stack.data[stack.len()-1] = cg
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gas.Add(gas, cg)
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}
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return newMemSize, gas, nil
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}
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// RunPrecompile runs and evaluate the output of a precompiled contract defined in contracts.go
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func (evm *EVM) RunPrecompiled(p *PrecompiledAccount, input []byte, contract *Contract) (ret []byte, err error) {
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gas := p.Gas(len(input))
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if contract.UseGas(gas) {
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ret = p.Call(input)
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return ret, nil
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} else {
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return nil, OutOfGasError
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}
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}
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