725 lines
17 KiB
Go
725 lines
17 KiB
Go
package ethchain
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import (
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_ "bytes"
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_ "fmt"
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"github.com/ethereum/eth-go/ethutil"
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_ "github.com/obscuren/secp256k1-go"
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"log"
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_ "math"
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"math/big"
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)
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type Vm struct {
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txPool *TxPool
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// Stack for processing contracts
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stack *Stack
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// non-persistent key/value memory storage
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mem map[string]*big.Int
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vars RuntimeVars
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state *State
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}
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type RuntimeVars struct {
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origin []byte
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blockNumber uint64
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prevHash []byte
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coinbase []byte
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time int64
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diff *big.Int
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txData []string
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}
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func NewVm(state *State, vars RuntimeVars) *Vm {
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return &Vm{vars: vars, state: state}
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}
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var Pow256 = ethutil.BigPow(2, 256)
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func (vm *Vm) RunClosure(closure *Closure) []byte {
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// If the amount of gas supplied is less equal to 0
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if closure.Gas.Cmp(big.NewInt(0)) <= 0 {
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// TODO Do something
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}
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// Memory for the current closure
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mem := &Memory{}
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// New stack (should this be shared?)
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stack := NewStack()
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// Instruction pointer
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pc := big.NewInt(0)
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// Current step count
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step := 0
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// The base for all big integer arithmetic
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base := new(big.Int)
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if ethutil.Config.Debug {
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ethutil.Config.Log.Debugf("# op\n")
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}
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for {
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step++
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// Get the memory location of pc
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val := closure.GetMem(pc)
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// Get the opcode (it must be an opcode!)
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op := OpCode(val.Uint())
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if ethutil.Config.Debug {
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ethutil.Config.Log.Debugf("%-3d %-4s", pc, op.String())
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}
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// TODO Get each instruction cost properly
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fee := new(big.Int)
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fee.Add(fee, big.NewInt(1000))
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if closure.Gas.Cmp(fee) < 0 {
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return closure.Return(nil)
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}
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switch op {
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case oLOG:
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stack.Print()
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mem.Print()
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case oSTOP: // Stop the closure
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return closure.Return(nil)
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// 0x20 range
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case oADD:
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x, y := stack.Popn()
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// (x + y) % 2 ** 256
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base.Add(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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stack.Push(base)
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case oSUB:
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x, y := stack.Popn()
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// (x - y) % 2 ** 256
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base.Sub(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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stack.Push(base)
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case oMUL:
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x, y := stack.Popn()
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// (x * y) % 2 ** 256
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base.Mul(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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stack.Push(base)
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case oDIV:
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x, y := stack.Popn()
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// floor(x / y)
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base.Div(x, y)
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// Pop result back on the stack
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stack.Push(base)
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case oSDIV:
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x, y := stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Div(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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stack.Push(z)
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case oMOD:
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x, y := stack.Popn()
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base.Mod(x, y)
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stack.Push(base)
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case oSMOD:
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x, y := stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Mod(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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stack.Push(z)
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case oEXP:
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x, y := stack.Popn()
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base.Exp(x, y, Pow256)
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stack.Push(base)
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case oNEG:
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base.Sub(Pow256, stack.Pop())
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stack.Push(base)
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case oLT:
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x, y := stack.Popn()
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// x < y
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if x.Cmp(y) < 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case oGT:
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x, y := stack.Popn()
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// x > y
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if x.Cmp(y) > 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case oNOT:
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x, y := stack.Popn()
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// x != y
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if x.Cmp(y) != 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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// 0x10 range
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case oAND:
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case oOR:
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case oXOR:
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case oBYTE:
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// 0x20 range
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case oSHA3:
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// 0x30 range
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case oADDRESS:
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stack.Push(ethutil.BigD(closure.Object().Address()))
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case oBALANCE:
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stack.Push(closure.Value)
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case oORIGIN:
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stack.Push(ethutil.BigD(vm.vars.origin))
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case oCALLER:
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stack.Push(ethutil.BigD(closure.Callee().Address()))
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case oCALLVALUE:
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// FIXME: Original value of the call, not the current value
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stack.Push(closure.Value)
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case oCALLDATA:
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offset := stack.Pop()
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mem.Set(offset.Int64(), int64(len(closure.Args)), closure.Args)
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case oCALLDATASIZE:
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stack.Push(big.NewInt(int64(len(closure.Args))))
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case oGASPRICE:
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// TODO
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// 0x40 range
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case oPREVHASH:
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stack.Push(ethutil.BigD(vm.vars.prevHash))
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case oCOINBASE:
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stack.Push(ethutil.BigD(vm.vars.coinbase))
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case oTIMESTAMP:
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stack.Push(big.NewInt(vm.vars.time))
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case oNUMBER:
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stack.Push(big.NewInt(int64(vm.vars.blockNumber)))
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case oDIFFICULTY:
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stack.Push(vm.vars.diff)
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case oGASLIMIT:
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// TODO
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// 0x50 range
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case oPUSH: // Push PC+1 on to the stack
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pc.Add(pc, ethutil.Big1)
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val := closure.GetMem(pc).BigInt()
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stack.Push(val)
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case oPOP:
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stack.Pop()
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case oDUP:
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stack.Push(stack.Peek())
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case oSWAP:
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x, y := stack.Popn()
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stack.Push(y)
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stack.Push(x)
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case oMLOAD:
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offset := stack.Pop()
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stack.Push(ethutil.BigD(mem.Get(offset.Int64(), 32)))
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case oMSTORE: // Store the value at stack top-1 in to memory at location stack top
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// Pop value of the stack
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val, mStart := stack.Popn()
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mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(val, 256))
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case oMSTORE8:
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val, mStart := stack.Popn()
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base.And(val, new(big.Int).SetInt64(0xff))
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mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(base, 256))
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case oSLOAD:
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loc := stack.Pop()
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val := closure.GetMem(loc)
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stack.Push(val.BigInt())
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case oSSTORE:
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val, loc := stack.Popn()
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closure.SetMem(loc, ethutil.NewValue(val))
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case oJUMP:
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pc = stack.Pop()
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case oJUMPI:
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pos, cond := stack.Popn()
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if cond.Cmp(big.NewInt(0)) > 0 {
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pc = pos
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}
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case oPC:
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stack.Push(pc)
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case oMSIZE:
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stack.Push(big.NewInt(int64(mem.Len())))
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// 0x60 range
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case oCALL:
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// Pop return size and offset
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retSize, retOffset := stack.Popn()
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// Pop input size and offset
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inSize, inOffset := stack.Popn()
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// Get the arguments from the memory
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args := mem.Get(inOffset.Int64(), inSize.Int64())
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// Pop gas and value of the stack.
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gas, value := stack.Popn()
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// Closure addr
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addr := stack.Pop()
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// Fetch the contract which will serve as the closure body
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contract := vm.state.GetContract(addr.Bytes())
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// Create a new callable closure
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closure := NewClosure(closure, contract, vm.state, gas, value)
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// Executer the closure and get the return value (if any)
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ret := closure.Call(vm, args)
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mem.Set(retOffset.Int64(), retSize.Int64(), ret)
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case oRETURN:
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size, offset := stack.Popn()
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ret := mem.Get(offset.Int64(), size.Int64())
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return closure.Return(ret)
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case oSUICIDE:
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/*
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recAddr := stack.Pop().Bytes()
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// Purge all memory
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deletedMemory := contract.state.Purge()
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// Add refunds to the pop'ed address
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refund := new(big.Int).Mul(StoreFee, big.NewInt(int64(deletedMemory)))
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account := state.GetAccount(recAddr)
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account.Amount.Add(account.Amount, refund)
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// Update the refunding address
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state.UpdateAccount(recAddr, account)
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// Delete the contract
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state.trie.Update(string(addr), "")
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ethutil.Config.Log.Debugf("(%d) => %x\n", deletedMemory, recAddr)
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break out
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*/
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default:
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ethutil.Config.Log.Debugln("Invalid opcode", op)
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}
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pc.Add(pc, ethutil.Big1)
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}
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}
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/*
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// Old VM code
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func (vm *Vm) Process(contract *Contract, state *State, vars RuntimeVars) {
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vm.mem = make(map[string]*big.Int)
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vm.stack = NewStack()
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addr := vars.address // tx.Hash()[12:]
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// Instruction pointer
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pc := int64(0)
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if contract == nil {
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fmt.Println("Contract not found")
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return
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}
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Pow256 := ethutil.BigPow(2, 256)
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if ethutil.Config.Debug {
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ethutil.Config.Log.Debugf("# op\n")
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}
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stepcount := 0
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totalFee := new(big.Int)
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out:
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for {
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stepcount++
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// The base big int for all calculations. Use this for any results.
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base := new(big.Int)
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val := contract.GetMem(pc)
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//fmt.Printf("%x = %d, %v %x\n", r, len(r), v, nb)
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op := OpCode(val.Uint())
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var fee *big.Int = new(big.Int)
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var fee2 *big.Int = new(big.Int)
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if stepcount > 16 {
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fee.Add(fee, StepFee)
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}
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// Calculate the fees
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switch op {
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case oSSTORE:
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y, x := vm.stack.Peekn()
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val := contract.Addr(ethutil.BigToBytes(x, 256))
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if val.IsEmpty() && len(y.Bytes()) > 0 {
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fee2.Add(DataFee, StoreFee)
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} else {
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fee2.Sub(DataFee, StoreFee)
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}
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case oSLOAD:
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fee.Add(fee, StoreFee)
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case oEXTRO, oBALANCE:
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fee.Add(fee, ExtroFee)
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case oSHA256, oRIPEMD160, oECMUL, oECADD, oECSIGN, oECRECOVER, oECVALID:
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fee.Add(fee, CryptoFee)
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case oMKTX:
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fee.Add(fee, ContractFee)
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}
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tf := new(big.Int).Add(fee, fee2)
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if contract.Amount.Cmp(tf) < 0 {
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fmt.Println("Insufficient fees to continue running the contract", tf, contract.Amount)
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break
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}
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// Add the fee to the total fee. It's subtracted when we're done looping
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totalFee.Add(totalFee, tf)
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if ethutil.Config.Debug {
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ethutil.Config.Log.Debugf("%-3d %-4s", pc, op.String())
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}
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switch op {
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case oSTOP:
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fmt.Println("")
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break out
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case oADD:
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x, y := vm.stack.Popn()
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// (x + y) % 2 ** 256
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base.Add(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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vm.stack.Push(base)
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case oSUB:
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x, y := vm.stack.Popn()
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// (x - y) % 2 ** 256
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base.Sub(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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vm.stack.Push(base)
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case oMUL:
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x, y := vm.stack.Popn()
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// (x * y) % 2 ** 256
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base.Mul(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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vm.stack.Push(base)
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case oDIV:
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x, y := vm.stack.Popn()
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// floor(x / y)
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base.Div(x, y)
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// Pop result back on the stack
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vm.stack.Push(base)
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case oSDIV:
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x, y := vm.stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Div(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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vm.stack.Push(z)
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case oMOD:
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x, y := vm.stack.Popn()
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base.Mod(x, y)
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vm.stack.Push(base)
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case oSMOD:
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x, y := vm.stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Mod(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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vm.stack.Push(z)
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case oEXP:
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x, y := vm.stack.Popn()
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base.Exp(x, y, Pow256)
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vm.stack.Push(base)
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case oNEG:
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base.Sub(Pow256, vm.stack.Pop())
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vm.stack.Push(base)
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case oLT:
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x, y := vm.stack.Popn()
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// x < y
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if x.Cmp(y) < 0 {
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vm.stack.Push(ethutil.BigTrue)
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} else {
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vm.stack.Push(ethutil.BigFalse)
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}
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case oLE:
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x, y := vm.stack.Popn()
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// x <= y
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if x.Cmp(y) < 1 {
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vm.stack.Push(ethutil.BigTrue)
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} else {
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vm.stack.Push(ethutil.BigFalse)
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}
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case oGT:
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x, y := vm.stack.Popn()
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// x > y
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if x.Cmp(y) > 0 {
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vm.stack.Push(ethutil.BigTrue)
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} else {
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vm.stack.Push(ethutil.BigFalse)
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}
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case oGE:
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x, y := vm.stack.Popn()
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// x >= y
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if x.Cmp(y) > -1 {
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vm.stack.Push(ethutil.BigTrue)
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} else {
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vm.stack.Push(ethutil.BigFalse)
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}
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case oNOT:
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x, y := vm.stack.Popn()
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// x != y
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if x.Cmp(y) != 0 {
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vm.stack.Push(ethutil.BigTrue)
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} else {
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vm.stack.Push(ethutil.BigFalse)
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}
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case oMYADDRESS:
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vm.stack.Push(ethutil.BigD(addr))
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case oTXSENDER:
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vm.stack.Push(ethutil.BigD(vars.sender))
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case oTXVALUE:
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vm.stack.Push(vars.txValue)
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case oTXDATAN:
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vm.stack.Push(big.NewInt(int64(len(vars.txData))))
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case oTXDATA:
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v := vm.stack.Pop()
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// v >= len(data)
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if v.Cmp(big.NewInt(int64(len(vars.txData)))) >= 0 {
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vm.stack.Push(ethutil.Big("0"))
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} else {
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vm.stack.Push(ethutil.Big(vars.txData[v.Uint64()]))
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}
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case oBLK_PREVHASH:
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vm.stack.Push(ethutil.BigD(vars.prevHash))
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case oBLK_COINBASE:
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vm.stack.Push(ethutil.BigD(vars.coinbase))
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case oBLK_TIMESTAMP:
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vm.stack.Push(big.NewInt(vars.time))
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case oBLK_NUMBER:
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vm.stack.Push(big.NewInt(int64(vars.blockNumber)))
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case oBLK_DIFFICULTY:
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vm.stack.Push(vars.diff)
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case oBASEFEE:
|
|
// e = 10^21
|
|
e := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(21), big.NewInt(0))
|
|
d := new(big.Rat)
|
|
d.SetInt(vars.diff)
|
|
c := new(big.Rat)
|
|
c.SetFloat64(0.5)
|
|
// d = diff / 0.5
|
|
d.Quo(d, c)
|
|
// base = floor(d)
|
|
base.Div(d.Num(), d.Denom())
|
|
|
|
x := new(big.Int)
|
|
x.Div(e, base)
|
|
|
|
// x = floor(10^21 / floor(diff^0.5))
|
|
vm.stack.Push(x)
|
|
case oSHA256, oSHA3, oRIPEMD160:
|
|
// This is probably save
|
|
// ceil(pop / 32)
|
|
length := int(math.Ceil(float64(vm.stack.Pop().Uint64()) / 32.0))
|
|
// New buffer which will contain the concatenated popped items
|
|
data := new(bytes.Buffer)
|
|
for i := 0; i < length; i++ {
|
|
// Encode the number to bytes and have it 32bytes long
|
|
num := ethutil.NumberToBytes(vm.stack.Pop().Bytes(), 256)
|
|
data.WriteString(string(num))
|
|
}
|
|
|
|
if op == oSHA256 {
|
|
vm.stack.Push(base.SetBytes(ethutil.Sha256Bin(data.Bytes())))
|
|
} else if op == oSHA3 {
|
|
vm.stack.Push(base.SetBytes(ethutil.Sha3Bin(data.Bytes())))
|
|
} else {
|
|
vm.stack.Push(base.SetBytes(ethutil.Ripemd160(data.Bytes())))
|
|
}
|
|
case oECMUL:
|
|
y := vm.stack.Pop()
|
|
x := vm.stack.Pop()
|
|
//n := vm.stack.Pop()
|
|
|
|
//if ethutil.Big(x).Cmp(ethutil.Big(y)) {
|
|
data := new(bytes.Buffer)
|
|
data.WriteString(x.String())
|
|
data.WriteString(y.String())
|
|
if secp256k1.VerifyPubkeyValidity(data.Bytes()) == 1 {
|
|
// TODO
|
|
} else {
|
|
// Invalid, push infinity
|
|
vm.stack.Push(ethutil.Big("0"))
|
|
vm.stack.Push(ethutil.Big("0"))
|
|
}
|
|
//} else {
|
|
// // Invalid, push infinity
|
|
// vm.stack.Push("0")
|
|
// vm.stack.Push("0")
|
|
//}
|
|
|
|
case oECADD:
|
|
case oECSIGN:
|
|
case oECRECOVER:
|
|
case oECVALID:
|
|
case oPUSH:
|
|
pc++
|
|
vm.stack.Push(contract.GetMem(pc).BigInt())
|
|
case oPOP:
|
|
// Pop current value of the stack
|
|
vm.stack.Pop()
|
|
case oDUP:
|
|
// Dup top stack
|
|
x := vm.stack.Pop()
|
|
vm.stack.Push(x)
|
|
vm.stack.Push(x)
|
|
case oSWAP:
|
|
// Swap two top most values
|
|
x, y := vm.stack.Popn()
|
|
vm.stack.Push(y)
|
|
vm.stack.Push(x)
|
|
case oMLOAD:
|
|
x := vm.stack.Pop()
|
|
vm.stack.Push(vm.mem[x.String()])
|
|
case oMSTORE:
|
|
x, y := vm.stack.Popn()
|
|
vm.mem[x.String()] = y
|
|
case oSLOAD:
|
|
// Load the value in storage and push it on the stack
|
|
x := vm.stack.Pop()
|
|
// decode the object as a big integer
|
|
decoder := contract.Addr(x.Bytes())
|
|
if !decoder.IsNil() {
|
|
vm.stack.Push(decoder.BigInt())
|
|
} else {
|
|
vm.stack.Push(ethutil.BigFalse)
|
|
}
|
|
case oSSTORE:
|
|
// Store Y at index X
|
|
y, x := vm.stack.Popn()
|
|
addr := ethutil.BigToBytes(x, 256)
|
|
fmt.Printf(" => %x (%v) @ %v", y.Bytes(), y, ethutil.BigD(addr))
|
|
contract.SetAddr(addr, y)
|
|
//contract.State().Update(string(idx), string(y))
|
|
case oJMP:
|
|
x := vm.stack.Pop().Int64()
|
|
// Set pc to x - 1 (minus one so the incrementing at the end won't effect it)
|
|
pc = x
|
|
pc--
|
|
case oJMPI:
|
|
x := vm.stack.Pop()
|
|
// Set pc to x if it's non zero
|
|
if x.Cmp(ethutil.BigFalse) != 0 {
|
|
pc = x.Int64()
|
|
pc--
|
|
}
|
|
case oIND:
|
|
vm.stack.Push(big.NewInt(int64(pc)))
|
|
case oEXTRO:
|
|
memAddr := vm.stack.Pop()
|
|
contractAddr := vm.stack.Pop().Bytes()
|
|
|
|
// Push the contract's memory on to the stack
|
|
vm.stack.Push(contractMemory(state, contractAddr, memAddr))
|
|
case oBALANCE:
|
|
// Pushes the balance of the popped value on to the stack
|
|
account := state.GetAccount(vm.stack.Pop().Bytes())
|
|
vm.stack.Push(account.Amount)
|
|
case oMKTX:
|
|
addr, value := vm.stack.Popn()
|
|
from, length := vm.stack.Popn()
|
|
|
|
makeInlineTx(addr.Bytes(), value, from, length, contract, state)
|
|
case oSUICIDE:
|
|
recAddr := vm.stack.Pop().Bytes()
|
|
// Purge all memory
|
|
deletedMemory := contract.state.Purge()
|
|
// Add refunds to the pop'ed address
|
|
refund := new(big.Int).Mul(StoreFee, big.NewInt(int64(deletedMemory)))
|
|
account := state.GetAccount(recAddr)
|
|
account.Amount.Add(account.Amount, refund)
|
|
// Update the refunding address
|
|
state.UpdateAccount(recAddr, account)
|
|
// Delete the contract
|
|
state.trie.Update(string(addr), "")
|
|
|
|
ethutil.Config.Log.Debugf("(%d) => %x\n", deletedMemory, recAddr)
|
|
break out
|
|
default:
|
|
fmt.Printf("Invalid OPCODE: %x\n", op)
|
|
}
|
|
ethutil.Config.Log.Debugln("")
|
|
//vm.stack.Print()
|
|
pc++
|
|
}
|
|
|
|
state.UpdateContract(addr, contract)
|
|
}
|
|
*/
|
|
|
|
func makeInlineTx(addr []byte, value, from, length *big.Int, contract *Contract, state *State) {
|
|
ethutil.Config.Log.Debugf(" => creating inline tx %x %v %v %v", addr, value, from, length)
|
|
j := int64(0)
|
|
dataItems := make([]string, int(length.Uint64()))
|
|
for i := from.Int64(); i < length.Int64(); i++ {
|
|
dataItems[j] = contract.GetMem(big.NewInt(j)).Str()
|
|
j++
|
|
}
|
|
|
|
tx := NewTransaction(addr, value, dataItems)
|
|
if tx.IsContract() {
|
|
contract := MakeContract(tx, state)
|
|
state.UpdateContract(contract)
|
|
} else {
|
|
account := state.GetAccount(tx.Recipient)
|
|
account.Amount.Add(account.Amount, tx.Value)
|
|
state.UpdateAccount(tx.Recipient, account)
|
|
}
|
|
}
|
|
|
|
// Returns an address from the specified contract's address
|
|
func contractMemory(state *State, contractAddr []byte, memAddr *big.Int) *big.Int {
|
|
contract := state.GetContract(contractAddr)
|
|
if contract == nil {
|
|
log.Panicf("invalid contract addr %x", contractAddr)
|
|
}
|
|
val := state.trie.Get(memAddr.String())
|
|
|
|
// decode the object as a big integer
|
|
decoder := ethutil.NewValueFromBytes([]byte(val))
|
|
if decoder.IsNil() {
|
|
return ethutil.BigFalse
|
|
}
|
|
|
|
return decoder.BigInt()
|
|
}
|