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Moved the vm code the block manager and added more opcodes

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pull/9/head
obscuren 11 years ago
parent 33004d704e
commit 8c4eca2490
3 changed files with 78 additions and 375 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 93
      block_manager.go
  2. 284
      vm.go
  3. 76
      vm_test.go

93
block_manager.go
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@ -6,14 +6,14 @@ import (
"github.com/ethereum/ethutil-go"
"log"
"math/big"
"strconv"
)
type BlockChain struct {
// Last block
LastBlock *ethutil.Block
// The famous, the fabulous Mister GENESIIIIIIS (block)
genesisBlock *ethutil.Block
// Last known total difficulty
TD *big.Int
}
@ -22,11 +22,10 @@ func NewBlockChain() *BlockChain {
bc.genesisBlock = ethutil.NewBlock(ethutil.Encode(ethutil.Genesis))
// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.TD = new(big.Int)
bc.TD.SetBytes(ethutil.Config.Db.LastKnownTD())
bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
// TODO get last block from the database
//bc.LastBlock = bc.genesisBlock
bc.LastBlock = bc.genesisBlock
return bc
}
@ -46,6 +45,9 @@ type BlockManager struct {
// Stack for processing contracts
stack *Stack
// Last known block number
LastBlockNumber *big.Int
}
func NewBlockManager() *BlockManager {
@ -54,6 +56,10 @@ func NewBlockManager() *BlockManager {
stack: NewStack(),
}
// Set the last known block number based on the blockchains last
// block
bm.LastBlockNumber = bm.BlockInfo(bm.bc.LastBlock).Number
return bm
}
@ -99,6 +105,20 @@ func (bm *BlockManager) ProcessBlock(block *ethutil.Block) error {
return nil
}
func (bm *BlockManager) writeBlockInfo(block *ethutil.Block) {
bi := ethutil.BlockInfo{Number: bm.LastBlockNumber.Add(bm.LastBlockNumber, big.NewInt(1))}
ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.MarshalRlp())
}
func (bm *BlockManager) BlockInfo(block *ethutil.Block) ethutil.BlockInfo {
bi := ethutil.BlockInfo{}
data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
bi.UnmarshalRlp(data)
return bi
}
func (bm *BlockManager) CalculateTD(block *ethutil.Block) bool {
uncleDiff := new(big.Int)
for _, uncle := range block.Uncles {
@ -204,10 +224,11 @@ func (bm *BlockManager) ProcessContract(tx *ethutil.Transaction, block *ethutil.
lockChan <- true
}
func (bm *BlockManager) ProcContract(tx *ethutil.Transaction,
block *ethutil.Block, cb TxCallback) {
// Contract evaluation is done here.
func (bm *BlockManager) ProcContract(tx *ethutil.Transaction, block *ethutil.Block, cb TxCallback) {
// Instruction pointer
pc := 0
blockInfo := bm.BlockInfo(block)
contract := block.GetContract(tx.Hash())
if contract == nil {
@ -238,6 +259,8 @@ out:
}
switch op {
case oSTOP:
break out
case oADD:
x, y := bm.stack.Popn()
// (x + y) % 2 ** 256
@ -378,7 +401,34 @@ out:
case oBLK_TIMESTAMP:
bm.stack.Push(big.NewInt(block.Time).String())
case oBLK_NUMBER:
bm.stack.Push(blockInfo.Number.String())
case oBLK_DIFFICULTY:
bm.stack.Push(block.Difficulty.String())
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(block.Difficulty)
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))
bm.stack.Push(x.String())
case oSHA256:
case oRIPEMD160:
case oECMUL:
case oECADD:
case oECSIGN:
case oECRECOVER:
case oECVALID:
case oSHA3:
case oPUSH:
// Get the next entry and pushes the value on the stack
pc++
@ -386,12 +436,25 @@ out:
case oPOP:
// Pop current value of the stack
bm.stack.Pop()
case oLOAD:
// Load instruction X on the stack
i, _ := strconv.Atoi(bm.stack.Pop())
bm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(i), 32))))
case oSTOP:
break out
case oDUP:
case oSWAP:
case oMLOAD:
case oMSTORE:
case oSLOAD:
case oSSTORE:
case oJMP:
case oJMPI:
case oIND:
case oEXTRO:
case oBALANCE:
case oMKTX:
case oSUICIDE:
/*
case oLOAD:
// Load instruction X on the stack
i, _ := strconv.Atoi(bm.stack.Pop())
bm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(i), 32))))
*/
}
pc++
}

284
vm.go
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@ -1,284 +0,0 @@
package main
import (
"fmt"
"github.com/ethereum/ethutil-go"
"math/big"
"strconv"
)
// Op codes
const (
oSTOP int = 0x00
oADD int = 0x01
oMUL int = 0x02
oSUB int = 0x03
oDIV int = 0x04
oSDIV int = 0x05
oMOD int = 0x06
oSMOD int = 0x07
oEXP int = 0x08
oNEG int = 0x09
oLT int = 0x0a
oLE int = 0x0b
oGT int = 0x0c
oGE int = 0x0d
oEQ int = 0x0e
oNOT int = 0x0f
oMYADDRESS int = 0x10
oTXSENDER int = 0x11
oTXVALUE int = 0x12
oTXFEE int = 0x13
oTXDATAN int = 0x14
oTXDATA int = 0x15
oBLK_PREVHASH int = 0x16
oBLK_COINBASE int = 0x17
oBLK_TIMESTAMP int = 0x18
oBLK_NUMBER int = 0x19
oBLK_DIFFICULTY int = 0x1a
oSHA256 int = 0x20
oRIPEMD160 int = 0x21
oECMUL int = 0x22
oECADD int = 0x23
oECSIGN int = 0x24
oECRECOVER int = 0x25
oECVALID int = 0x26
oPUSH int = 0x30
oPOP int = 0x31
oDUP int = 0x32
oDUPN int = 0x33
oSWAP int = 0x34
oSWAPN int = 0x35
oLOAD int = 0x36
oSTORE int = 0x37
oJMP int = 0x40
oJMPI int = 0x41
oIND int = 0x42
oEXTRO int = 0x50
oBALANCE int = 0x51
oMKTX int = 0x60
oSUICIDE int = 0xff
)
type OpType int
const (
tNorm = iota
tData
tExtro
tCrypto
)
type TxCallback func(opType OpType) bool
// Simple push/pop stack mechanism
type Stack struct {
data []string
}
func NewStack() *Stack {
return &Stack{}
}
func (st *Stack) Pop() string {
s := len(st.data)
str := st.data[s-1]
st.data = st.data[:s-1]
return str
}
func (st *Stack) Popn() (*big.Int, *big.Int) {
s := len(st.data)
strs := st.data[s-2:]
st.data = st.data[:s-2]
return ethutil.Big(strs[0]), ethutil.Big(strs[1])
}
func (st *Stack) Push(d string) {
st.data = append(st.data, d)
}
func (st *Stack) Print() {
fmt.Println(st.data)
}
type Vm struct {
// Stack
stack *Stack
}
func NewVm() *Vm {
return &Vm{
stack: NewStack(),
}
}
func (vm *Vm) ProcContract(tx *ethutil.Transaction,
block *ethutil.Block, cb TxCallback) {
// Instruction pointer
pc := 0
contract := block.GetContract(tx.Hash())
if contract == nil {
fmt.Println("Contract not found")
return
}
Pow256 := ethutil.BigPow(2, 256)
//fmt.Printf("# op arg\n")
out:
for {
// The base big int for all calculations. Use this for any results.
base := new(big.Int)
// XXX Should Instr return big int slice instead of string slice?
// Get the next instruction from the contract
//op, _, _ := Instr(contract.state.Get(string(Encode(uint32(pc)))))
nb := ethutil.NumberToBytes(uint64(pc), 32)
op, _, _ := ethutil.Instr(contract.State().Get(string(nb)))
if !cb(0) {
break
}
if Debug {
//fmt.Printf("%-3d %-4d\n", pc, op)
}
switch op {
case oADD:
x, y := vm.stack.Popn()
// (x + y) % 2 ** 256
base.Add(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
vm.stack.Push(base.String())
case oSUB:
x, y := vm.stack.Popn()
// (x - y) % 2 ** 256
base.Sub(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
vm.stack.Push(base.String())
case oMUL:
x, y := vm.stack.Popn()
// (x * y) % 2 ** 256
base.Mul(x, y)
base.Mod(base, Pow256)
// Pop result back on the stack
vm.stack.Push(base.String())
case oDIV:
x, y := vm.stack.Popn()
// floor(x / y)
base.Div(x, y)
// Pop result back on the stack
vm.stack.Push(base.String())
case oSDIV:
x, y := vm.stack.Popn()
// n > 2**255
if x.Cmp(Pow256) > 0 {
x.Sub(Pow256, x)
}
if y.Cmp(Pow256) > 0 {
y.Sub(Pow256, y)
}
z := new(big.Int)
z.Div(x, y)
if z.Cmp(Pow256) > 0 {
z.Sub(Pow256, z)
}
// Push result on to the stack
vm.stack.Push(z.String())
case oMOD:
x, y := vm.stack.Popn()
base.Mod(x, y)
vm.stack.Push(base.String())
case oSMOD:
x, y := vm.stack.Popn()
// n > 2**255
if x.Cmp(Pow256) > 0 {
x.Sub(Pow256, x)
}
if y.Cmp(Pow256) > 0 {
y.Sub(Pow256, y)
}
z := new(big.Int)
z.Mod(x, y)
if z.Cmp(Pow256) > 0 {
z.Sub(Pow256, z)
}
// Push result on to the stack
vm.stack.Push(z.String())
case oEXP:
x, y := vm.stack.Popn()
base.Exp(x, y, Pow256)
vm.stack.Push(base.String())
case oNEG:
base.Sub(Pow256, ethutil.Big(vm.stack.Pop()))
vm.stack.Push(base.String())
case oLT:
x, y := vm.stack.Popn()
// x < y
if x.Cmp(y) < 0 {
vm.stack.Push("1")
} else {
vm.stack.Push("0")
}
case oLE:
x, y := vm.stack.Popn()
// x <= y
if x.Cmp(y) < 1 {
vm.stack.Push("1")
} else {
vm.stack.Push("0")
}
case oGT:
x, y := vm.stack.Popn()
// x > y
if x.Cmp(y) > 0 {
vm.stack.Push("1")
} else {
vm.stack.Push("0")
}
case oGE:
x, y := vm.stack.Popn()
// x >= y
if x.Cmp(y) > -1 {
vm.stack.Push("1")
} else {
vm.stack.Push("0")
}
case oNOT:
x, y := vm.stack.Popn()
// x != y
if x.Cmp(y) != 0 {
vm.stack.Push("1")
} else {
vm.stack.Push("0")
}
case oMYADDRESS:
vm.stack.Push(string(tx.Hash()))
case oTXSENDER:
vm.stack.Push(string(tx.Sender()))
case oPUSH:
// Get the next entry and pushes the value on the stack
pc++
vm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(pc), 32))))
case oPOP:
// Pop current value of the stack
vm.stack.Pop()
case oLOAD:
// Load instruction X on the stack
i, _ := strconv.Atoi(vm.stack.Pop())
vm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(i), 32))))
case oSTOP:
break out
}
pc++
}
vm.stack.Print()
}

76
vm_test.go
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@ -1,76 +0,0 @@
package main
/*
import (
_"fmt"
"testing"
)
func TestVm(t *testing.T) {
InitFees()
db, _ := NewMemDatabase()
Db = db
ctrct := NewTransaction("", 200000000, []string{
"PUSH", "1a2f2e",
"PUSH", "hallo",
"POP", // POP hallo
"PUSH", "3",
"LOAD", // Load hallo back on the stack
"PUSH", "1",
"PUSH", "2",
"ADD",
"PUSH", "2",
"PUSH", "1",
"SUB",
"PUSH", "100000000000000000000000",
"PUSH", "10000000000000",
"SDIV",
"PUSH", "105",
"PUSH", "200",
"MOD",
"PUSH", "100000000000000000000000",
"PUSH", "10000000000000",
"SMOD",
"PUSH", "5",
"PUSH", "10",
"LT",
"PUSH", "5",
"PUSH", "5",
"LE",
"PUSH", "50",
"PUSH", "5",
"GT",
"PUSH", "5",
"PUSH", "5",
"GE",
"PUSH", "10",
"PUSH", "10",
"NOT",
"MYADDRESS",
"TXSENDER",
"STOP",
})
tx := NewTransaction("1e8a42ea8cce13", 100, []string{})
block := CreateBlock("", 0, "", "c014ba53", 0, 0, "", []*Transaction{ctrct, tx})
db.Put(block.Hash(), block.MarshalRlp())
bm := NewBlockManager()
bm.ProcessBlock( block )
}
*/
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