865 lines
22 KiB
Go
865 lines
22 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 implements the Ethereum Virtual Machine.
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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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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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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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// Vm implements VirtualMachine
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type Vm struct {
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env Environment
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}
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// New returns a new Virtual Machine
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func New(env Environment) *Vm {
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return &Vm{env: env}
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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 (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
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self.env.SetDepth(self.env.Depth() + 1)
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defer self.env.SetDepth(self.env.Depth() - 1)
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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 {
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// In case of a VM exception (known exceptions) all gas consumed (panics NOT included).
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context.UseGas(context.Gas)
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ret = context.Return(nil)
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}
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}()
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if context.CodeAddr != nil {
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if p := Precompiled[context.CodeAddr.Str()]; p != nil {
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return self.RunPrecompiled(p, input, context)
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}
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}
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var (
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codehash = crypto.Sha3Hash(context.Code) // codehash is used when doing jump dest caching
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program *Program
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)
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if !DisableJit {
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// Fetch program status.
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// * If ready run using JIT
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// * If unknown, compile in a seperate goroutine
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// * If forced wait for compilation and run once done
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if status := GetProgramStatus(codehash); status == progReady {
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return RunProgram(GetProgram(codehash), self.env, context, input)
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} else if status == progUnknown {
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if ForceJit {
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// Create and compile program
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program = NewProgram(context.Code)
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perr := CompileProgram(program)
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if perr == nil {
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return RunProgram(program, self.env, context, 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 seperate goroutine
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program = NewProgram(context.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 = context.caller
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code = context.Code
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value = context.value
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price = context.Price
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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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statedb = self.env.State() // current state
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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. Pratically 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 !context.jumpdests.has(codehash, code, to) {
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nop := context.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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// 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 {
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self.log(pc, op, context.Gas, cost, mem, stack, context, err)
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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(code) == 0 {
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return context.Return(nil), nil
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}
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for {
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// Overhead of the atomic read might not be worth it
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/* TODO this still causes a few issues in the tests
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if program != nil && progStatus(atomic.LoadInt32(&program.status)) == progReady {
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// move execution
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glog.V(logger.Info).Infoln("Moved execution to JIT")
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return runProgram(program, pc, mem, stack, self.env, context, input)
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}
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*/
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// The base for all big integer arithmetic
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base := new(big.Int)
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// Get the memory location of pc
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op = context.GetOp(pc)
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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(self.env, context, caller, op, statedb, 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 !context.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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self.log(pc, op, context.Gas, cost, mem, stack, context, nil)
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switch op {
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case ADD:
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x, y := stack.pop(), stack.pop()
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base.Add(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case SUB:
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x, y := stack.pop(), stack.pop()
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base.Sub(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case MUL:
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x, y := stack.pop(), stack.pop()
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base.Mul(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case DIV:
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) != 0 {
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base.Div(x, y)
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}
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case SDIV:
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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n := new(big.Int)
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if new(big.Int).Mul(x, y).Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Div(x.Abs(x), y.Abs(y)).Mul(base, n)
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U256(base)
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}
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stack.push(base)
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case MOD:
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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base.Mod(x, y)
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}
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U256(base)
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stack.push(base)
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case SMOD:
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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n := new(big.Int)
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if x.Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Mod(x.Abs(x), y.Abs(y)).Mul(base, n)
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U256(base)
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}
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stack.push(base)
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case EXP:
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x, y := stack.pop(), stack.pop()
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base.Exp(x, y, Pow256)
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U256(base)
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stack.push(base)
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case SIGNEXTEND:
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back := stack.pop()
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if back.Cmp(big.NewInt(31)) < 0 {
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bit := uint(back.Uint64()*8 + 7)
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num := stack.pop()
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mask := new(big.Int).Lsh(common.Big1, bit)
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mask.Sub(mask, common.Big1)
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if common.BitTest(num, int(bit)) {
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num.Or(num, mask.Not(mask))
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} else {
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num.And(num, mask)
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}
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num = U256(num)
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stack.push(num)
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}
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case NOT:
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stack.push(U256(new(big.Int).Not(stack.pop())))
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case LT:
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x, y := stack.pop(), stack.pop()
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// x < y
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if x.Cmp(y) < 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case GT:
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x, y := stack.pop(), stack.pop()
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// x > y
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if x.Cmp(y) > 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case SLT:
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x, y := S256(stack.pop()), S256(stack.pop())
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// x < y
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if x.Cmp(S256(y)) < 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case SGT:
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x, y := S256(stack.pop()), S256(stack.pop())
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// x > y
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if x.Cmp(y) > 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case EQ:
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x, y := stack.pop(), stack.pop()
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// x == y
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if x.Cmp(y) == 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case ISZERO:
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x := stack.pop()
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if x.Cmp(common.BigFalse) > 0 {
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stack.push(common.BigFalse)
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} else {
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stack.push(common.BigTrue)
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}
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case AND:
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x, y := stack.pop(), stack.pop()
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stack.push(base.And(x, y))
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case OR:
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x, y := stack.pop(), stack.pop()
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stack.push(base.Or(x, y))
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case XOR:
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x, y := stack.pop(), stack.pop()
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stack.push(base.Xor(x, y))
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case BYTE:
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th, val := stack.pop(), stack.pop()
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if th.Cmp(big.NewInt(32)) < 0 {
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byt := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
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base.Set(byt)
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} else {
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base.Set(common.BigFalse)
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}
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stack.push(base)
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case ADDMOD:
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x := stack.pop()
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y := stack.pop()
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z := stack.pop()
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if z.Cmp(Zero) > 0 {
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add := new(big.Int).Add(x, y)
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base.Mod(add, z)
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base = U256(base)
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}
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stack.push(base)
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case MULMOD:
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x := stack.pop()
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y := stack.pop()
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z := stack.pop()
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if z.Cmp(Zero) > 0 {
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mul := new(big.Int).Mul(x, y)
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base.Mod(mul, z)
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U256(base)
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}
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stack.push(base)
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case SHA3:
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offset, size := stack.pop(), stack.pop()
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data := crypto.Sha3(mem.Get(offset.Int64(), size.Int64()))
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stack.push(common.BigD(data))
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case ADDRESS:
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stack.push(common.Bytes2Big(context.Address().Bytes()))
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case BALANCE:
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addr := common.BigToAddress(stack.pop())
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balance := statedb.GetBalance(addr)
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stack.push(new(big.Int).Set(balance))
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case ORIGIN:
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origin := self.env.Origin()
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stack.push(origin.Big())
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case CALLER:
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caller := context.caller.Address()
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stack.push(common.Bytes2Big(caller.Bytes()))
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case CALLVALUE:
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stack.push(new(big.Int).Set(value))
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case CALLDATALOAD:
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data := getData(input, stack.pop(), common.Big32)
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stack.push(common.Bytes2Big(data))
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case CALLDATASIZE:
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l := int64(len(input))
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stack.push(big.NewInt(l))
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case CALLDATACOPY:
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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data := getData(input, cOff, l)
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mem.Set(mOff.Uint64(), l.Uint64(), data)
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case CODESIZE, EXTCODESIZE:
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var code []byte
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if op == EXTCODESIZE {
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addr := common.BigToAddress(stack.pop())
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code = statedb.GetCode(addr)
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} else {
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code = context.Code
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}
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l := big.NewInt(int64(len(code)))
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stack.push(l)
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case CODECOPY, EXTCODECOPY:
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var code []byte
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if op == EXTCODECOPY {
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addr := common.BigToAddress(stack.pop())
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code = statedb.GetCode(addr)
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} else {
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code = context.Code
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}
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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codeCopy := getData(code, cOff, l)
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mem.Set(mOff.Uint64(), l.Uint64(), codeCopy)
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case GASPRICE:
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stack.push(new(big.Int).Set(context.Price))
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case BLOCKHASH:
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num := stack.pop()
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n := new(big.Int).Sub(self.env.BlockNumber(), common.Big257)
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if num.Cmp(n) > 0 && num.Cmp(self.env.BlockNumber()) < 0 {
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stack.push(self.env.GetHash(num.Uint64()).Big())
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} else {
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stack.push(common.Big0)
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}
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case COINBASE:
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coinbase := self.env.Coinbase()
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stack.push(coinbase.Big())
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case TIMESTAMP:
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time := self.env.Time()
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stack.push(new(big.Int).SetUint64(time))
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case NUMBER:
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number := self.env.BlockNumber()
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stack.push(U256(number))
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case DIFFICULTY:
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difficulty := self.env.Difficulty()
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stack.push(new(big.Int).Set(difficulty))
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case GASLIMIT:
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stack.push(new(big.Int).Set(self.env.GasLimit()))
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case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
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size := uint64(op - PUSH1 + 1)
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byts := getData(code, new(big.Int).SetUint64(pc+1), new(big.Int).SetUint64(size))
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// push value to stack
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stack.push(common.Bytes2Big(byts))
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pc += size
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case POP:
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stack.pop()
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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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stack.dup(n)
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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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stack.swap(n)
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case LOG0, LOG1, LOG2, LOG3, LOG4:
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n := int(op - LOG0)
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topics := make([]common.Hash, n)
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mStart, mSize := stack.pop(), stack.pop()
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for i := 0; i < n; i++ {
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topics[i] = common.BigToHash(stack.pop())
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}
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data := mem.Get(mStart.Int64(), mSize.Int64())
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log := state.NewLog(context.Address(), topics, data, self.env.BlockNumber().Uint64())
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self.env.AddLog(log)
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case MLOAD:
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offset := stack.pop()
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val := common.BigD(mem.Get(offset.Int64(), 32))
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stack.push(val)
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case MSTORE:
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// pop value of the stack
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mStart, val := stack.pop(), stack.pop()
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mem.Set(mStart.Uint64(), 32, common.BigToBytes(val, 256))
|
|
|
|
case MSTORE8:
|
|
off, val := stack.pop().Int64(), stack.pop().Int64()
|
|
|
|
mem.store[off] = byte(val & 0xff)
|
|
|
|
case SLOAD:
|
|
loc := common.BigToHash(stack.pop())
|
|
val := statedb.GetState(context.Address(), loc).Big()
|
|
stack.push(val)
|
|
|
|
case SSTORE:
|
|
loc := common.BigToHash(stack.pop())
|
|
val := stack.pop()
|
|
|
|
statedb.SetState(context.Address(), loc, common.BigToHash(val))
|
|
|
|
case JUMP:
|
|
if err := jump(pc, stack.pop()); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
continue
|
|
case JUMPI:
|
|
pos, cond := stack.pop(), stack.pop()
|
|
|
|
if cond.Cmp(common.BigTrue) >= 0 {
|
|
if err := jump(pc, pos); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
continue
|
|
}
|
|
|
|
case JUMPDEST:
|
|
case PC:
|
|
stack.push(new(big.Int).SetUint64(pc))
|
|
case MSIZE:
|
|
stack.push(big.NewInt(int64(mem.Len())))
|
|
case GAS:
|
|
stack.push(new(big.Int).Set(context.Gas))
|
|
case CREATE:
|
|
|
|
var (
|
|
value = stack.pop()
|
|
offset, size = stack.pop(), stack.pop()
|
|
input = mem.Get(offset.Int64(), size.Int64())
|
|
gas = new(big.Int).Set(context.Gas)
|
|
addr common.Address
|
|
)
|
|
|
|
context.UseGas(context.Gas)
|
|
ret, suberr, ref := self.env.Create(context, input, gas, price, value)
|
|
if suberr != nil {
|
|
stack.push(common.BigFalse)
|
|
|
|
} else {
|
|
// gas < len(ret) * CreateDataGas == NO_CODE
|
|
dataGas := big.NewInt(int64(len(ret)))
|
|
dataGas.Mul(dataGas, params.CreateDataGas)
|
|
if context.UseGas(dataGas) {
|
|
ref.SetCode(ret)
|
|
}
|
|
addr = ref.Address()
|
|
|
|
stack.push(addr.Big())
|
|
|
|
}
|
|
|
|
case CALL, CALLCODE:
|
|
gas := stack.pop()
|
|
// pop gas and value of the stack.
|
|
addr, value := stack.pop(), stack.pop()
|
|
value = U256(value)
|
|
// pop input size and offset
|
|
inOffset, inSize := stack.pop(), stack.pop()
|
|
// pop return size and offset
|
|
retOffset, retSize := stack.pop(), stack.pop()
|
|
|
|
address := common.BigToAddress(addr)
|
|
|
|
// Get the arguments from the memory
|
|
args := mem.Get(inOffset.Int64(), inSize.Int64())
|
|
|
|
if len(value.Bytes()) > 0 {
|
|
gas.Add(gas, params.CallStipend)
|
|
}
|
|
|
|
var (
|
|
ret []byte
|
|
err error
|
|
)
|
|
if op == CALLCODE {
|
|
ret, err = self.env.CallCode(context, address, args, gas, price, value)
|
|
} else {
|
|
ret, err = self.env.Call(context, address, args, gas, price, value)
|
|
}
|
|
|
|
if err != nil {
|
|
stack.push(common.BigFalse)
|
|
|
|
} else {
|
|
stack.push(common.BigTrue)
|
|
|
|
mem.Set(retOffset.Uint64(), retSize.Uint64(), ret)
|
|
}
|
|
|
|
case RETURN:
|
|
offset, size := stack.pop(), stack.pop()
|
|
ret := mem.GetPtr(offset.Int64(), size.Int64())
|
|
|
|
return context.Return(ret), nil
|
|
case SUICIDE:
|
|
receiver := statedb.GetOrNewStateObject(common.BigToAddress(stack.pop()))
|
|
balance := statedb.GetBalance(context.Address())
|
|
|
|
receiver.AddBalance(balance)
|
|
|
|
statedb.Delete(context.Address())
|
|
|
|
fallthrough
|
|
case STOP: // Stop the context
|
|
|
|
return context.Return(nil), nil
|
|
default:
|
|
|
|
return nil, fmt.Errorf("Invalid opcode %x", op)
|
|
}
|
|
|
|
pc++
|
|
|
|
}
|
|
}
|
|
|
|
// calculateGasAndSize calculates the required given the opcode and stack items calculates the new memorysize for
|
|
// the operation. This does not reduce gas or resizes the memory.
|
|
func calculateGasAndSize(env Environment, context *Context, caller ContextRef, op OpCode, statedb *state.StateDB, mem *Memory, stack *stack) (*big.Int, *big.Int, error) {
|
|
var (
|
|
gas = new(big.Int)
|
|
newMemSize *big.Int = new(big.Int)
|
|
)
|
|
err := baseCheck(op, stack, gas)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// stack Check, memory resize & gas phase
|
|
switch op {
|
|
case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
|
|
n := int(op - SWAP1 + 2)
|
|
err := stack.require(n)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
gas.Set(GasFastestStep)
|
|
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
|
|
n := int(op - DUP1 + 1)
|
|
err := stack.require(n)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
gas.Set(GasFastestStep)
|
|
case LOG0, LOG1, LOG2, LOG3, LOG4:
|
|
n := int(op - LOG0)
|
|
err := stack.require(n + 2)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
mSize, mStart := stack.data[stack.len()-2], stack.data[stack.len()-1]
|
|
|
|
gas.Add(gas, params.LogGas)
|
|
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(n)), params.LogTopicGas))
|
|
gas.Add(gas, new(big.Int).Mul(mSize, params.LogDataGas))
|
|
|
|
newMemSize = calcMemSize(mStart, mSize)
|
|
case EXP:
|
|
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(len(stack.data[stack.len()-2].Bytes()))), params.ExpByteGas))
|
|
case SSTORE:
|
|
err := stack.require(2)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
var g *big.Int
|
|
y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
|
|
val := statedb.GetState(context.Address(), common.BigToHash(x))
|
|
|
|
// This checks for 3 scenario's and calculates gas accordingly
|
|
// 1. From a zero-value address to a non-zero value (NEW VALUE)
|
|
// 2. From a non-zero value address to a zero-value address (DELETE)
|
|
// 3. From a nen-zero to a non-zero (CHANGE)
|
|
if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
|
|
// 0 => non 0
|
|
g = params.SstoreSetGas
|
|
} else if !common.EmptyHash(val) && common.EmptyHash(common.BigToHash(y)) {
|
|
statedb.Refund(params.SstoreRefundGas)
|
|
|
|
g = params.SstoreClearGas
|
|
} else {
|
|
// non 0 => non 0 (or 0 => 0)
|
|
g = params.SstoreClearGas
|
|
}
|
|
gas.Set(g)
|
|
case SUICIDE:
|
|
if !statedb.IsDeleted(context.Address()) {
|
|
statedb.Refund(params.SuicideRefundGas)
|
|
}
|
|
case MLOAD:
|
|
newMemSize = calcMemSize(stack.peek(), u256(32))
|
|
case MSTORE8:
|
|
newMemSize = calcMemSize(stack.peek(), u256(1))
|
|
case MSTORE:
|
|
newMemSize = calcMemSize(stack.peek(), u256(32))
|
|
case RETURN:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
|
|
case SHA3:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
|
|
|
|
words := toWordSize(stack.data[stack.len()-2])
|
|
gas.Add(gas, words.Mul(words, params.Sha3WordGas))
|
|
case CALLDATACOPY:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
|
|
|
|
words := toWordSize(stack.data[stack.len()-3])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
case CODECOPY:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
|
|
|
|
words := toWordSize(stack.data[stack.len()-3])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
case EXTCODECOPY:
|
|
newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-4])
|
|
|
|
words := toWordSize(stack.data[stack.len()-4])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
|
|
case CREATE:
|
|
newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-3])
|
|
case CALL, CALLCODE:
|
|
gas.Add(gas, stack.data[stack.len()-1])
|
|
|
|
if op == CALL {
|
|
if env.State().GetStateObject(common.BigToAddress(stack.data[stack.len()-2])) == nil {
|
|
gas.Add(gas, params.CallNewAccountGas)
|
|
}
|
|
}
|
|
|
|
if len(stack.data[stack.len()-3].Bytes()) > 0 {
|
|
gas.Add(gas, params.CallValueTransferGas)
|
|
}
|
|
|
|
x := calcMemSize(stack.data[stack.len()-6], stack.data[stack.len()-7])
|
|
y := calcMemSize(stack.data[stack.len()-4], stack.data[stack.len()-5])
|
|
|
|
newMemSize = common.BigMax(x, y)
|
|
}
|
|
|
|
if newMemSize.Cmp(common.Big0) > 0 {
|
|
newMemSizeWords := toWordSize(newMemSize)
|
|
newMemSize.Mul(newMemSizeWords, u256(32))
|
|
|
|
if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
|
|
oldSize := toWordSize(big.NewInt(int64(mem.Len())))
|
|
pow := new(big.Int).Exp(oldSize, common.Big2, Zero)
|
|
linCoef := new(big.Int).Mul(oldSize, params.MemoryGas)
|
|
quadCoef := new(big.Int).Div(pow, params.QuadCoeffDiv)
|
|
oldTotalFee := new(big.Int).Add(linCoef, quadCoef)
|
|
|
|
pow.Exp(newMemSizeWords, common.Big2, Zero)
|
|
linCoef = new(big.Int).Mul(newMemSizeWords, params.MemoryGas)
|
|
quadCoef = new(big.Int).Div(pow, params.QuadCoeffDiv)
|
|
newTotalFee := new(big.Int).Add(linCoef, quadCoef)
|
|
|
|
fee := new(big.Int).Sub(newTotalFee, oldTotalFee)
|
|
gas.Add(gas, fee)
|
|
}
|
|
}
|
|
|
|
return newMemSize, gas, nil
|
|
}
|
|
|
|
// RunPrecompile runs and evaluate the output of a precompiled contract defined in contracts.go
|
|
func (self *Vm) RunPrecompiled(p *PrecompiledAccount, input []byte, context *Context) (ret []byte, err error) {
|
|
gas := p.Gas(len(input))
|
|
if context.UseGas(gas) {
|
|
ret = p.Call(input)
|
|
|
|
return context.Return(ret), nil
|
|
} else {
|
|
return nil, OutOfGasError
|
|
}
|
|
}
|
|
|
|
// log emits a log event to the environment for each opcode encountered. This is not to be confused with the
|
|
// LOG* opcode.
|
|
func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *stack, context *Context, err error) {
|
|
if Debug {
|
|
mem := make([]byte, len(memory.Data()))
|
|
copy(mem, memory.Data())
|
|
stck := make([]*big.Int, len(stack.Data()))
|
|
copy(stck, stack.Data())
|
|
|
|
object := context.self.(*state.StateObject)
|
|
storage := make(map[common.Hash][]byte)
|
|
object.EachStorage(func(k, v []byte) {
|
|
storage[common.BytesToHash(k)] = v
|
|
})
|
|
|
|
self.env.AddStructLog(StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage, err})
|
|
}
|
|
}
|
|
|
|
// Environment returns the current workable state of the VM
|
|
func (self *Vm) Env() Environment {
|
|
return self.env
|
|
}
|