1 files changed, 200 insertions, 0 deletions
diff --git a/tests/helper/vm.go b/tests/helper/vm.go
new file mode 100644
index 000000000..8811936fa
--- /dev/null
+++ b/tests/helper/vm.go
@@ -0,0 +1,200 @@
+package helper
+
+import (
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/state"
+	"github.com/ethereum/go-ethereum/vm"
+)
+
+type Env struct {
+	depth        int
+	state        *state.StateDB
+	skipTransfer bool
+	initial      bool
+	Gas          *big.Int
+
+	origin   []byte
+	parent   []byte
+	coinbase []byte
+
+	number     *big.Int
+	time       int64
+	difficulty *big.Int
+	gasLimit   *big.Int
+
+	logs state.Logs
+
+	vmTest bool
+}
+
+func NewEnv(state *state.StateDB) *Env {
+	return &Env{
+		state: state,
+	}
+}
+
+func NewEnvFromMap(state *state.StateDB, envValues map[string]string, exeValues map[string]string) *Env {
+	env := NewEnv(state)
+
+	env.origin = ethutil.Hex2Bytes(exeValues["caller"])
+	env.parent = ethutil.Hex2Bytes(envValues["previousHash"])
+	env.coinbase = ethutil.Hex2Bytes(envValues["currentCoinbase"])
+	env.number = ethutil.Big(envValues["currentNumber"])
+	env.time = ethutil.Big(envValues["currentTimestamp"]).Int64()
+	env.difficulty = ethutil.Big(envValues["currentDifficulty"])
+	env.gasLimit = ethutil.Big(envValues["currentGasLimit"])
+	env.Gas = new(big.Int)
+
+	return env
+}
+
+func (self *Env) Origin() []byte        { return self.origin }
+func (self *Env) BlockNumber() *big.Int { return self.number }
+func (self *Env) PrevHash() []byte      { return self.parent }
+func (self *Env) Coinbase() []byte      { return self.coinbase }
+func (self *Env) Time() int64           { return self.time }
+func (self *Env) Difficulty() *big.Int  { return self.difficulty }
+func (self *Env) State() *state.StateDB { return self.state }
+func (self *Env) GasLimit() *big.Int    { return self.gasLimit }
+func (self *Env) VmType() vm.Type       { return vm.StdVmTy }
+func (self *Env) GetHash(n uint64) []byte {
+	return crypto.Sha3([]byte(big.NewInt(int64(n)).String()))
+}
+func (self *Env) AddLog(log state.Log) {
+	self.logs = append(self.logs, log)
+}
+func (self *Env) Depth() int     { return self.depth }
+func (self *Env) SetDepth(i int) { self.depth = i }
+func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
+	if self.skipTransfer {
+		// ugly hack
+		if self.initial {
+			self.initial = false
+			return nil
+		}
+
+		if from.Balance().Cmp(amount) < 0 {
+			return errors.New("Insufficient balance in account")
+		}
+
+		return nil
+	}
+	return vm.Transfer(from, to, amount)
+}
+
+func (self *Env) vm(addr, data []byte, gas, price, value *big.Int) *core.Execution {
+	exec := core.NewExecution(self, addr, data, gas, price, value)
+
+	return exec
+}
+
+func (self *Env) Call(caller vm.ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error) {
+	if self.vmTest && self.depth > 0 {
+		caller.ReturnGas(gas, price)
+
+		return nil, nil
+	}
+	exe := self.vm(addr, data, gas, price, value)
+	ret, err := exe.Call(addr, caller)
+	self.Gas = exe.Gas
+
+	return ret, err
+
+}
+func (self *Env) CallCode(caller vm.ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error) {
+	if self.vmTest && self.depth > 0 {
+		caller.ReturnGas(gas, price)
+
+		return nil, nil
+	}
+	exe := self.vm(caller.Address(), data, gas, price, value)
+	return exe.Call(addr, caller)
+}
+
+func (self *Env) Create(caller vm.ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error, vm.ContextRef) {
+	exe := self.vm(addr, data, gas, price, value)
+	if self.vmTest {
+		caller.ReturnGas(gas, price)
+
+		nonce := self.state.GetNonce(caller.Address())
+		obj := self.state.GetOrNewStateObject(crypto.CreateAddress(caller.Address(), nonce))
+
+		return nil, nil, obj
+	} else {
+		return exe.Create(caller)
+	}
+}
+
+func RunVm(state *state.StateDB, env, exec map[string]string) ([]byte, state.Logs, *big.Int, error) {
+	var (
+		to    = FromHex(exec["address"])
+		from  = FromHex(exec["caller"])
+		data  = FromHex(exec["data"])
+		gas   = ethutil.Big(exec["gas"])
+		price = ethutil.Big(exec["gasPrice"])
+		value = ethutil.Big(exec["value"])
+	)
+	// Reset the pre-compiled contracts for VM tests.
+	vm.Precompiled = make(map[string]*vm.PrecompiledAccount)
+
+	caller := state.GetOrNewStateObject(from)
+
+	vmenv := NewEnvFromMap(state, env, exec)
+	vmenv.vmTest = true
+	vmenv.skipTransfer = true
+	vmenv.initial = true
+	ret, err := vmenv.Call(caller, to, data, gas, price, value)
+
+	return ret, vmenv.logs, vmenv.Gas, err
+}
+
+func RunState(statedb *state.StateDB, env, tx map[string]string) ([]byte, state.Logs, *big.Int, error) {
+	var (
+		keyPair, _ = crypto.NewKeyPairFromSec([]byte(ethutil.Hex2Bytes(tx["secretKey"])))
+		to         = FromHex(tx["to"])
+		data       = FromHex(tx["data"])
+		gas        = ethutil.Big(tx["gasLimit"])
+		price      = ethutil.Big(tx["gasPrice"])
+		value      = ethutil.Big(tx["value"])
+		caddr      = FromHex(env["currentCoinbase"])
+	)
+
+	// Set pre compiled contracts
+	vm.Precompiled = vm.PrecompiledContracts()
+
+	coinbase := statedb.GetOrNewStateObject(caddr)
+	coinbase.SetGasPool(ethutil.Big(env["currentGasLimit"]))
+
+	message := NewMessage(keyPair.Address(), to, data, value, gas, price)
+	vmenv := NewEnvFromMap(statedb, env, tx)
+	st := core.NewStateTransition(vmenv, message, coinbase)
+	vmenv.origin = keyPair.Address()
+	ret, err := st.TransitionState()
+	statedb.Update(vmenv.Gas)
+
+	return ret, vmenv.logs, vmenv.Gas, err
+}
+
+type Message struct {
+	from, to          []byte
+	value, gas, price *big.Int
+	data              []byte
+}
+
+func NewMessage(from, to, data []byte, value, gas, price *big.Int) Message {
+	return Message{from, to, value, gas, price, data}
+}
+
+func (self Message) Hash() []byte       { return nil }
+func (self Message) From() []byte       { return self.from }
+func (self Message) To() []byte         { return self.to }
+func (self Message) GasPrice() *big.Int { return self.price }
+func (self Message) Gas() *big.Int      { return self.gas }
+func (self Message) Value() *big.Int    { return self.value }
+func (self Message) Nonce() uint64      { return 0 }
+func (self Message) Data() []byte       { return self.data }