test, cmd/evm, core, core/vm: illegal code hash implementation

This implements a generic approach to enabling soft forks by allowing
anyone to put in hashes of contracts that should not be interacted from.
This will help "The DAO" in their endevour to stop any whithdrawals from
any DAO contract by convincing the mining community to accept their code
hash.

core/vm/environment.go

@@ -73,6 +73,8 @@ type Environment interface {
 	DelegateCall(me ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)
 	// Create a new contract
 	Create(me ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error)
+	// Mark the code hash that was executed
+	MarkCodeHash(hash common.Hash)
 }
 
 // Vm is the basic interface for an implementation of the EVM.
@@ -96,6 +98,7 @@ type Database interface {
 
 	GetCode(common.Address) []byte
 	SetCode(common.Address, []byte)
+	GetCodeHash(common.Address) common.Hash
 
 	AddRefund(*big.Int)
 	GetRefund() *big.Int

core/vm/jit_test.go

@@ -175,10 +175,11 @@ func NewEnv(noJit, forceJit bool) *Env {
 	return env
 }
 
-func (self *Env) RuleSet() RuleSet       { return ruleSet{new(big.Int)} }
-func (self *Env) Vm() Vm                 { return self.evm }
-func (self *Env) Origin() common.Address { return common.Address{} }
-func (self *Env) BlockNumber() *big.Int  { return big.NewInt(0) }
+func (self *Env) MarkCodeHash(common.Hash) {}
+func (self *Env) RuleSet() RuleSet         { return ruleSet{new(big.Int)} }
+func (self *Env) Vm() Vm                   { return self.evm }
+func (self *Env) Origin() common.Address   { return common.Address{} }
+func (self *Env) BlockNumber() *big.Int    { return big.NewInt(0) }
 func (self *Env) AddStructLog(log StructLog) {
 }
 func (self *Env) StructLogs() []StructLog {

core/vm/runtime/env.go

@@ -27,9 +27,10 @@ import (
 
 // Env is a basic runtime environment required for running the EVM.
 type Env struct {
-	ruleSet vm.RuleSet
-	depth   int
-	state   *state.StateDB
+	ruleSet       vm.RuleSet
+	depth         int
+	state         *state.StateDB
+	illegalHashes []common.Hash
 
 	origin   common.Address
 	coinbase common.Address
@@ -49,14 +50,15 @@ type Env struct {
 // NewEnv returns a new vm.Environment
 func NewEnv(cfg *Config, state *state.StateDB) vm.Environment {
 	env := &Env{
-		ruleSet:    cfg.RuleSet,
-		state:      state,
-		origin:     cfg.Origin,
-		coinbase:   cfg.Coinbase,
-		number:     cfg.BlockNumber,
-		time:       cfg.Time,
-		difficulty: cfg.Difficulty,
-		gasLimit:   cfg.GasLimit,
+		ruleSet:       cfg.RuleSet,
+		illegalHashes: cfg.illegalHashes,
+		state:         state,
+		origin:        cfg.Origin,
+		coinbase:      cfg.Coinbase,
+		number:        cfg.BlockNumber,
+		time:          cfg.Time,
+		difficulty:    cfg.Difficulty,
+		gasLimit:      cfg.GasLimit,
 	}
 	env.evm = vm.New(env, vm.Config{
 		Debug:     cfg.Debug,
@@ -79,6 +81,8 @@ func (self *Env) AddStructLog(log vm.StructLog) {
 	self.logs = append(self.logs, log)
 }
 
+func (self *Env) MarkCodeHash(hash common.Hash) {}
+
 func (self *Env) RuleSet() vm.RuleSet      { return self.ruleSet }
 func (self *Env) Vm() vm.Vm                { return self.evm }
 func (self *Env) Origin() common.Address   { return self.origin }

core/vm/runtime/runtime.go

@@ -35,17 +35,18 @@ func (ruleSet) IsHomestead(*big.Int) bool { return true }
 // Config is a basic type specifying certain configuration flags for running
 // the EVM.
 type Config struct {
-	RuleSet     vm.RuleSet
-	Difficulty  *big.Int
-	Origin      common.Address
-	Coinbase    common.Address
-	BlockNumber *big.Int
-	Time        *big.Int
-	GasLimit    *big.Int
-	GasPrice    *big.Int
-	Value       *big.Int
-	DisableJit  bool // "disable" so it's enabled by default
-	Debug       bool
+	RuleSet       vm.RuleSet
+	Difficulty    *big.Int
+	Origin        common.Address
+	Coinbase      common.Address
+	BlockNumber   *big.Int
+	Time          *big.Int
+	GasLimit      *big.Int
+	GasPrice      *big.Int
+	Value         *big.Int
+	DisableJit    bool // "disable" so it's enabled by default
+	Debug         bool
+	illegalHashes []common.Hash
 
 	State     *state.StateDB
 	GetHashFn func(n uint64) common.Hash