Read most protocol params from common/params.json

* Add params package with exported variables generated from
  github.com/ethereum/common/blob/master/params.json
* Use params package variables in applicable places
* Add check for minimum gas limit in validation of block's gas limit
* Remove common/params.json from go-ethereum to avoid
  outdated version of it

core/block_processor.go

@@ -11,6 +11,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/pow"
 	"github.com/ethereum/go-ethereum/rlp"
 	"gopkg.in/fatih/set.v0"
@@ -252,7 +253,7 @@ func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (td *big
 // an uncle or anything that isn't on the current block chain.
 // Validation validates easy over difficult (dagger takes longer time = difficult)
 func (sm *BlockProcessor) ValidateHeader(block, parent *types.Header) error {
-	if len(block.Extra) > 1024 {
+	if big.NewInt(int64(len(block.Extra))).Cmp(params.MaximumExtraDataSize) == 1 {
 		return fmt.Errorf("Block extra data too long (%d)", len(block.Extra))
 	}
 
@@ -261,13 +262,11 @@ func (sm *BlockProcessor) ValidateHeader(block, parent *types.Header) error {
 		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
 	}
 
-	// TODO: use use minGasLimit and gasLimitBoundDivisor from
-	// https://github.com/ethereum/common/blob/master/params.json
-	// block.gasLimit - parent.gasLimit <= parent.gasLimit / 1024
+	// block.gasLimit - parent.gasLimit <= parent.gasLimit / GasLimitBoundDivisor
 	a := new(big.Int).Sub(block.GasLimit, parent.GasLimit)
 	a.Abs(a)
-	b := new(big.Int).Div(parent.GasLimit, big.NewInt(1024))
-	if !(a.Cmp(b) < 0) {
+	b := new(big.Int).Div(parent.GasLimit, params.GasLimitBoundDivisor)
+	if !(a.Cmp(b) < 0) || (block.GasLimit.Cmp(params.MinGasLimit) == -1) {
 		return fmt.Errorf("GasLimit check failed for block %v (%v > %v)", block.GasLimit, a, b)
 	}
 

core/chain_manager.go

@@ -12,6 +12,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
@@ -32,18 +33,15 @@ type StateQuery interface {
 func CalcDifficulty(block, parent *types.Header) *big.Int {
 	diff := new(big.Int)
 
-	diffBoundDiv := big.NewInt(2048)
-	min := big.NewInt(131072)
-
-	adjust := new(big.Int).Div(parent.Difficulty, diffBoundDiv)
-	if (block.Time - parent.Time) < 8 {
+	adjust := new(big.Int).Div(parent.Difficulty, params.DifficultyBoundDivisor)
+	if big.NewInt(int64(block.Time)-int64(parent.Time)).Cmp(params.DurationLimit) < 0 {
 		diff.Add(parent.Difficulty, adjust)
 	} else {
 		diff.Sub(parent.Difficulty, adjust)
 	}
 
-	if diff.Cmp(min) < 0 {
-		return min
+	if diff.Cmp(params.MinimumDifficulty) < 0 {
+		return params.MinimumDifficulty
 	}
 
 	return diff
@@ -76,7 +74,7 @@ func CalcGasLimit(parent, block *types.Block) *big.Int {
 	result := new(big.Int).Add(previous, curInt)
 	result.Div(result, big.NewInt(1024))
 
-	return common.BigMax(GenesisGasLimit, result)
+	return common.BigMax(params.GenesisGasLimit, result)
 }
 
 type ChainManager struct {

core/execution.go

@@ -8,6 +8,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 type Execution struct {
@@ -43,7 +44,7 @@ func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.
 
 	env := self.env
 	evm := self.evm
-	if env.Depth() == vm.MaxCallDepth {
+	if env.Depth() > int(params.CallCreateDepth.Int64()) {
 		caller.ReturnGas(self.Gas, self.price)
 
 		return nil, vm.DepthError{}

core/genesis.go

@@ -3,12 +3,12 @@ package core
 import (
 	"encoding/json"
 	"fmt"
-	"math/big"
 	"os"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 /*
@@ -18,13 +18,11 @@ import (
 var ZeroHash256 = make([]byte, 32)
 var ZeroHash160 = make([]byte, 20)
 var ZeroHash512 = make([]byte, 64)
-var GenesisDiff = big.NewInt(131072)
-var GenesisGasLimit = big.NewInt(3141592)
 
 func GenesisBlock(db common.Database) *types.Block {
-	genesis := types.NewBlock(common.Hash{}, common.Address{}, common.Hash{}, GenesisDiff, 42, "")
+	genesis := types.NewBlock(common.Hash{}, common.Address{}, common.Hash{}, params.GenesisDifficulty, 42, "")
 	genesis.Header().Number = common.Big0
-	genesis.Header().GasLimit = GenesisGasLimit
+	genesis.Header().GasLimit = params.GenesisGasLimit
 	genesis.Header().GasUsed = common.Big0
 	genesis.Header().Time = 0
 

core/state_transition.go

@@ -8,6 +8,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 const tryJit = false
@@ -178,17 +179,17 @@ func (self *StateTransition) transitionState() (ret []byte, usedGas *big.Int, er
 	)
 
 	// Transaction gas
-	if err = self.UseGas(vm.GasTx); err != nil {
+	if err = self.UseGas(params.TxGas); err != nil {
 		return nil, nil, InvalidTxError(err)
 	}
 
 	// Pay data gas
 	dgas := new(big.Int)
 	for _, byt := range self.data {
 		if byt != 0 {
-			dgas.Add(dgas, vm.GasTxDataNonzeroByte)
+			dgas.Add(dgas, params.TxDataNonZeroGas)
 		} else {
-			dgas.Add(dgas, vm.GasTxDataZeroByte)
+			dgas.Add(dgas, params.TxDataZeroGas)
 		}
 	}
 
@@ -202,7 +203,7 @@ func (self *StateTransition) transitionState() (ret []byte, usedGas *big.Int, er
 		ret, err, ref = vmenv.Create(sender, self.msg.Data(), self.gas, self.gasPrice, self.value)
 		if err == nil {
 			dataGas := big.NewInt(int64(len(ret)))
-			dataGas.Mul(dataGas, vm.GasCreateByte)
+			dataGas.Mul(dataGas, params.CreateDataGas)
 			if err := self.UseGas(dataGas); err == nil {
 				ref.SetCode(ret)
 			} else {

core/vm/address.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 type Address interface {
@@ -27,28 +28,28 @@ func PrecompiledContracts() map[string]*PrecompiledAccount {
 	return map[string]*PrecompiledAccount{
 		// ECRECOVER
 		string(common.LeftPadBytes([]byte{1}, 20)): &PrecompiledAccount{func(l int) *big.Int {
-			return GasEcrecover
+			return params.EcrecoverGas
 		}, ecrecoverFunc},
 
 		// SHA256
 		string(common.LeftPadBytes([]byte{2}, 20)): &PrecompiledAccount{func(l int) *big.Int {
 			n := big.NewInt(int64(l+31) / 32)
-			n.Mul(n, GasSha256Word)
-			return n.Add(n, GasSha256Base)
+			n.Mul(n, params.Sha256WordGas)
+			return n.Add(n, params.Sha256Gas)
 		}, sha256Func},
 
 		// RIPEMD160
 		string(common.LeftPadBytes([]byte{3}, 20)): &PrecompiledAccount{func(l int) *big.Int {
 			n := big.NewInt(int64(l+31) / 32)
-			n.Mul(n, GasRipemdWord)
-			return n.Add(n, GasRipemdBase)
+			n.Mul(n, params.Ripemd160WordGas)
+			return n.Add(n, params.Ripemd160Gas)
 		}, ripemd160Func},
 
 		string(common.LeftPadBytes([]byte{4}, 20)): &PrecompiledAccount{func(l int) *big.Int {
 			n := big.NewInt(int64(l+31) / 32)
-			n.Mul(n, GasIdentityWord)
+			n.Mul(n, params.IdentityWordGas)
 
-			return n.Add(n, GasIdentityBase)
+			return n.Add(n, params.IdentityGas)
 		}, memCpy},
 	}
 }

core/vm/common.go

@@ -20,8 +20,6 @@ const (
 	JitVmTy
 	MaxVmTy
 
-	MaxCallDepth = 1025
-
 	LogTyPretty byte = 0x1
 	LogTyDiff   byte = 0x2
 )

core/vm/errors.go

@@ -2,6 +2,7 @@ package vm
 
 import (
 	"fmt"
+	"github.com/ethereum/go-ethereum/params"
 	"math/big"
 )
 
@@ -42,7 +43,7 @@ func IsStack(err error) bool {
 type DepthError struct{}
 
 func (self DepthError) Error() string {
-	return fmt.Sprintf("Max call depth exceeded (%d)", MaxCallDepth)
+	return fmt.Sprintf("Max call depth exceeded (%d)", params.CallCreateDepth)
 }
 
 func IsDepthErr(err error) bool {

core/vm/gas.go

@@ -2,6 +2,7 @@ package vm
 
 import (
 	"fmt"
+	"github.com/ethereum/go-ethereum/params"
 	"math/big"
 )
 
@@ -13,45 +14,10 @@ var (
 	GasSlowStep    = big.NewInt(10)
 	GasExtStep     = big.NewInt(20)
 
-	GasStorageGet        = big.NewInt(50)
-	GasStorageAdd        = big.NewInt(20000)
-	GasStorageMod        = big.NewInt(5000)
-	GasLogBase           = big.NewInt(375)
-	GasLogTopic          = big.NewInt(375)
-	GasLogByte           = big.NewInt(8)
-	GasCreate            = big.NewInt(32000)
-	GasCreateByte        = big.NewInt(200)
-	GasCall              = big.NewInt(40)
-	GasCallValueTransfer = big.NewInt(9000)
-	GasStipend           = big.NewInt(2300)
-	GasCallNewAccount    = big.NewInt(25000)
-	GasReturn            = big.NewInt(0)
-	GasStop              = big.NewInt(0)
-	GasJumpDest          = big.NewInt(1)
+	GasReturn = big.NewInt(0)
+	GasStop   = big.NewInt(0)
 
-	RefundStorage = big.NewInt(15000)
-	RefundSuicide = big.NewInt(24000)
-
-	GasMemWord           = big.NewInt(3)
-	GasQuadCoeffDenom    = big.NewInt(512)
-	GasContractByte      = big.NewInt(200)
-	GasTransaction       = big.NewInt(21000)
-	GasTxDataNonzeroByte = big.NewInt(68)
-	GasTxDataZeroByte    = big.NewInt(4)
-	GasTx                = big.NewInt(21000)
-	GasExp               = big.NewInt(10)
-	GasExpByte           = big.NewInt(10)
-
-	GasSha3Base     = big.NewInt(30)
-	GasSha3Word     = big.NewInt(6)
-	GasSha256Base   = big.NewInt(60)
-	GasSha256Word   = big.NewInt(12)
-	GasRipemdBase   = big.NewInt(600)
-	GasRipemdWord   = big.NewInt(12)
-	GasEcrecover    = big.NewInt(3000)
-	GasIdentityBase = big.NewInt(15)
-	GasIdentityWord = big.NewInt(3)
-	GasCopyWord     = big.NewInt(3)
+	GasContractByte = big.NewInt(200)
 )
 
 func baseCheck(op OpCode, stack *stack, gas *big.Int) error {
@@ -71,8 +37,8 @@ func baseCheck(op OpCode, stack *stack, gas *big.Int) error {
 			return err
 		}
 
-		if r.stackPush && len(stack.data)-r.stackPop+1 > 1024 {
-			return fmt.Errorf("stack limit reached (%d)", maxStack)
+		if r.stackPush && len(stack.data)-r.stackPop+1 > int(params.StackLimit.Int64()) {
+			return fmt.Errorf("stack limit reached (%d)", params.StackLimit.Int64())
 		}
 
 		gas.Add(gas, r.gas)
@@ -145,13 +111,13 @@ var _baseCheck = map[OpCode]req{
 	BALANCE:      {1, GasExtStep, true},
 	EXTCODESIZE:  {1, GasExtStep, true},
 	EXTCODECOPY:  {4, GasExtStep, false},
-	SLOAD:        {1, GasStorageGet, true},
+	SLOAD:        {1, params.SloadGas, true},
 	SSTORE:       {2, Zero, false},
-	SHA3:         {2, GasSha3Base, true},
-	CREATE:       {3, GasCreate, true},
-	CALL:         {7, GasCall, true},
-	CALLCODE:     {7, GasCall, true},
-	JUMPDEST:     {0, GasJumpDest, false},
+	SHA3:         {2, params.Sha3Gas, true},
+	CREATE:       {3, params.CreateGas, true},
+	CALL:         {7, params.CallGas, true},
+	CALLCODE:     {7, params.CallGas, true},
+	JUMPDEST:     {0, params.JumpdestGas, false},
 	SUICIDE:      {1, Zero, false},
 	RETURN:       {2, Zero, false},
 	PUSH1:        {0, GasFastestStep, true},

core/vm/stack.go

@@ -5,8 +5,6 @@ import (
 	"math/big"
 )
 
-const maxStack = 1024
-
 func newStack() *stack {
 	return &stack{}
 }