Implemented LOG. Closes #159

ethchain/state_transition.go

@@ -237,6 +237,12 @@ func (self *StateTransition) TransitionState() (err error) {
 			}
 
 			msg.Output = ret
+		} else {
+			// Add default LOG
+			// PUSH1 1 CALLER ADD LOG1
+			addr := ethutil.BigD(sender.Address())
+			addr.Add(addr, ethutil.Big1)
+			tx.addLog(vm.Log{sender.Address(), []*big.Int{addr}, nil})
 		}
 	}
 

ethchain/transaction.go

@@ -8,6 +8,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethcrypto"
 	"github.com/ethereum/go-ethereum/ethstate"
 	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/vm"
 	"github.com/obscuren/secp256k1-go"
 )
 
@@ -28,6 +29,8 @@ type Transaction struct {
 	v         byte
 	r, s      []byte
 
+	logs []vm.Log
+
 	// Indicates whether this tx is a contract creation transaction
 	contractCreation bool
 }
@@ -54,6 +57,10 @@ func NewTransactionFromValue(val *ethutil.Value) *Transaction {
 	return tx
 }
 
+func (self *Transaction) addLog(log vm.Log) {
+	self.logs = append(self.logs, log)
+}
+
 func (self *Transaction) GasValue() *big.Int {
 	return new(big.Int).Mul(self.Gas, self.GasPrice)
 }

ethchain/types.go

@@ -18,7 +18,7 @@ const (
 	MOD  = 0x06
 	SMOD = 0x07
 	EXP  = 0x08
-	NEG  = 0x09
+	BNOT = 0x09
 	LT   = 0x0a
 	GT   = 0x0b
 	SLT  = 0x0c
@@ -166,7 +166,7 @@ var opCodeToString = map[OpCode]string{
 	MOD:  "MOD",
 	SMOD: "SMOD",
 	EXP:  "EXP",
-	NEG:  "NEG",
+	BNOT: "BNOT",
 	LT:   "LT",
 	GT:   "GT",
 	SLT:  "SLT",

ethchain/vm_env.go

@@ -31,6 +31,9 @@ func (self *VMEnv) BlockHash() []byte      { return self.block.Hash() }
 func (self *VMEnv) Value() *big.Int        { return self.tx.Value }
 func (self *VMEnv) State() *ethstate.State { return self.state }
 func (self *VMEnv) GasLimit() *big.Int     { return self.block.GasLimit }
+func (self *VMEnv) AddLog(log vm.Log) {
+	self.tx.addLog(log)
+}
 func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }

ethpipe/vm_env.go

@@ -34,6 +34,7 @@ func (self *VMEnv) BlockHash() []byte      { return self.block.Hash() }
 func (self *VMEnv) Value() *big.Int        { return self.value }
 func (self *VMEnv) State() *ethstate.State { return self.state }
 func (self *VMEnv) GasLimit() *big.Int     { return self.block.GasLimit }
+func (self *VMEnv) AddLog(vm.Log)          {}
 func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }

ethutil/common.go

@@ -77,6 +77,7 @@ func CurrencyToString(num *big.Int) string {
 var (
 	Big1     = big.NewInt(1)
 	Big2     = big.NewInt(2)
+	Big3     = big.NewInt(3)
 	Big0     = big.NewInt(0)
 	BigTrue  = Big1
 	BigFalse = Big0

tests/helper/vm.go

@@ -50,6 +50,7 @@ func (self *Env) Difficulty() *big.Int   { return self.difficulty }
 func (self *Env) BlockHash() []byte      { return nil }
 func (self *Env) State() *ethstate.State { return self.state }
 func (self *Env) GasLimit() *big.Int     { return self.gasLimit }
+func (self *Env) AddLog(vm.Log)          {}
 func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }

utils/vm_env.go

@@ -35,6 +35,7 @@ func (self *VMEnv) BlockHash() []byte      { return self.block.Hash() }
 func (self *VMEnv) Value() *big.Int        { return self.value }
 func (self *VMEnv) State() *ethstate.State { return self.state }
 func (self *VMEnv) GasLimit() *big.Int     { return self.block.GasLimit }
+func (self *VMEnv) AddLog(vm.Log)          {}
 func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }

vm/common.go

@@ -29,6 +29,7 @@ var (
 	GasMemory  = big.NewInt(1)
 	GasData    = big.NewInt(5)
 	GasTx      = big.NewInt(500)
+	GasLog     = big.NewInt(32)
 
 	Pow256 = ethutil.BigPow(2, 256)
 

vm/environment.go

@@ -20,6 +20,7 @@ type Environment interface {
 	BlockHash() []byte
 	GasLimit() *big.Int
 	Transfer(from, to Account, amount *big.Int) error
+	AddLog(Log)
 }
 
 type Object interface {

vm/log.go

+package vm
+
+import "math/big"
+
+type Log struct {
+	Address []byte
+	Topics  []*big.Int
+	Data    []byte
+}

vm/stack.go

@@ -139,6 +139,18 @@ func (m *Memory) Get(offset, size int64) []byte {
 	return nil
 }
 
+func (self *Memory) Geti(offset, size int64) (cpy []byte) {
+	if len(self.store) > int(offset) {
+		s := int64(math.Min(float64(len(self.store)), float64(offset+size)))
+		cpy = make([]byte, size)
+		copy(cpy, self.store[offset:offset+s])
+
+		return
+	}
+
+	return
+}
+
 func (m *Memory) Len() int {
 	return len(m.store)
 }

vm/types.go

@@ -18,7 +18,7 @@ const (
 	MOD  = 0x06
 	SMOD = 0x07
 	EXP  = 0x08
-	NEG  = 0x09
+	BNOT = 0x09
 	LT   = 0x0a
 	GT   = 0x0b
 	SLT  = 0x0c
@@ -144,6 +144,12 @@ const (
 	SWAP15 = 0x9e
 	SWAP16 = 0x9f
 
+	LOG0 = 0xa0
+	LOG1 = 0xa1
+	LOG2 = 0xa2
+	LOG3 = 0xa3
+	LOG4 = 0xa4
+
 	// 0xf0 range - closures
 	CREATE   = 0xf0
 	CALL     = 0xf1
@@ -166,7 +172,7 @@ var opCodeToString = map[OpCode]string{
 	MOD:  "MOD",
 	SMOD: "SMOD",
 	EXP:  "EXP",
-	NEG:  "NEG",
+	BNOT: "BNOT",
 	LT:   "LT",
 	GT:   "GT",
 	SLT:  "SLT",

vm/vm.go

@@ -268,7 +268,7 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 			U256(base)
 
 			stack.Push(base)
-		case NEG:
+		case BNOT:
 			require(1)
 			base.Sub(Pow256, stack.Pop())
 

vm/vm_debug.go

@@ -141,7 +141,7 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 		// Stack Check, memory resize & gas phase
 		switch op {
 		// Stack checks only
-		case NOT, CALLDATALOAD, POP, JUMP, NEG: // 1
+		case NOT, CALLDATALOAD, POP, JUMP, BNOT: // 1
 			require(1)
 		case ADD, SUB, DIV, SDIV, MOD, SMOD, EXP, LT, GT, SLT, SGT, EQ, AND, OR, XOR, BYTE: // 2
 			require(2)
@@ -153,6 +153,14 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 		case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
 			n := int(op - DUP1 + 1)
 			require(n)
+		case LOG0, LOG1, LOG2, LOG3, LOG4:
+			n := int(op - LOG0)
+			require(n + 2)
+
+			mSize, mStart := stack.Peekn()
+			gas.Set(GasLog)
+			addStepGasUsage(new(big.Int).Mul(big.NewInt(int64(n)), GasLog))
+			addStepGasUsage(new(big.Int).Add(mSize, mStart))
 		// Gas only
 		case STOP:
 			gas.Set(ethutil.Big0)
@@ -168,13 +176,16 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 			y, x := stack.Peekn()
 			val := closure.GetStorage(x)
 			if val.BigInt().Cmp(ethutil.Big0) == 0 && len(y.Bytes()) > 0 {
-				mult = ethutil.Big2
+				// 0 => non 0
+				mult = ethutil.Big3
 			} else if val.BigInt().Cmp(ethutil.Big0) != 0 && len(y.Bytes()) == 0 {
+				//state.AddBalance(closure.caller.Address(), new(big.Int).Mul(big.NewInt(100), closure.Price))
 				mult = ethutil.Big0
 			} else {
+				// non 0 => non 0
 				mult = ethutil.Big1
 			}
-			gas = new(big.Int).Mul(mult, GasSStore)
+			gas.Set(new(big.Int).Mul(mult, GasSStore))
 		case BALANCE:
 			require(1)
 			gas.Set(GasBalance)
@@ -375,10 +386,11 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 			self.Printf(" = %v", base)
 
 			stack.Push(base)
-		case NEG:
-			base.Sub(Pow256, stack.Pop())
+		case BNOT:
+			base.Sub(Pow256, stack.Pop()).Sub(base, ethutil.Big1)
 
-			base = U256(base)
+			// Not needed
+			//base = U256(base)
 
 			stack.Push(base)
 		case LT:
@@ -685,6 +697,15 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 			x, y := stack.Swapn(n)
 
 			self.Printf(" => [%d] %x [0] %x", n, x.Bytes(), y.Bytes())
+		case LOG0, LOG1, LOG2, LOG3, LOG4:
+			n := int(op - LOG0)
+			topics := make([]*big.Int, n)
+			mSize, mStart := stack.Pop().Int64(), stack.Pop().Int64()
+			data := mem.Geti(mStart, mSize)
+			for i := 0; i < n; i++ {
+				topics[i] = stack.Pop()
+			}
+			self.env.AddLog(Log{closure.Address(), topics, data})
 		case MLOAD:
 			offset := stack.Pop()
 			val := ethutil.BigD(mem.Get(offset.Int64(), 32))