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  outdated version of it

1 files changed, 54 insertions, 0 deletions

diff --git a/params/protocol_params.go b/params/protocol_params.go
new file mode 100755
index 000000000..d0bc2f4ad
--- /dev/null
+++ b/params/protocol_params.go
@@ -0,0 +1,54 @@
+// DO NOT EDIT!!!
+// AUTOGENERATED FROM generators/defaults.go
+
+package params
+
+import "math/big"
+
+var (
+	MaximumExtraDataSize   = big.NewInt(1024)    // Maximum size extra data may be after Genesis.
+	ExpByteGas             = big.NewInt(10)      // Times ceil(log256(exponent)) for the EXP instruction.
+	SloadGas               = big.NewInt(50)      // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
+	CallValueTransferGas   = big.NewInt(9000)    // Paid for CALL when the value transfor is non-zero.
+	CallNewAccountGas      = big.NewInt(25000)   // Paid for CALL when the destination address didn't exist prior.
+	TxGas                  = big.NewInt(21000)   // Per transaction. NOTE: Not payable on data of calls between transactions.
+	TxDataZeroGas          = big.NewInt(4)       // Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions.
+	GenesisGasLimit        = big.NewInt(3141592) // Gas limit of the Genesis block.
+	DifficultyBoundDivisor = big.NewInt(2048)    // The bound divisor of the difficulty, used in the update calculations.
+	QuadCoeffDiv           = big.NewInt(512)     // Divisor for the quadratic particle of the memory cost equation.
+	GenesisDifficulty      = big.NewInt(131072)  // Difficulty of the Genesis block.
+	DurationLimit          = big.NewInt(8)       // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
+	SstoreSetGas           = big.NewInt(20000)   // Once per SLOAD operation.
+	LogDataGas             = big.NewInt(8)       // Per byte in a LOG* operation's data.
+	CallStipend            = big.NewInt(2300)    // Free gas given at beginning of call.
+	EcrecoverGas           = big.NewInt(3000)    //
+	Sha256WordGas          = big.NewInt(12)      //
+	MinGasLimit            = big.NewInt(125000)  // Minimum the gas limit may ever be.
+	Sha3Gas                = big.NewInt(30)      // Once per SHA3 operation.
+	Sha256Gas              = big.NewInt(60)      //
+	IdentityWordGas        = big.NewInt(3)       //
+	Sha3WordGas            = big.NewInt(6)       // Once per word of the SHA3 operation's data.
+	SstoreResetGas         = big.NewInt(5000)    // Once per SSTORE operation if the zeroness changes from zero.
+	SstoreClearGas         = big.NewInt(5000)    // Once per SSTORE operation if the zeroness doesn't change.
+	SstoreRefundGas        = big.NewInt(15000)   // Once per SSTORE operation if the zeroness changes to zero.
+	JumpdestGas            = big.NewInt(1)       // Refunded gas, once per SSTORE operation if the zeroness changes to zero.
+	IdentityGas            = big.NewInt(15)      //
+	GasLimitBoundDivisor   = big.NewInt(1024)    // The bound divisor of the gas limit, used in update calculations.
+	EpochDuration          = big.NewInt(30000)   // Duration between proof-of-work epochs.
+	CallGas                = big.NewInt(40)      // Once per CALL operation & message call transaction.
+	CreateDataGas          = big.NewInt(200)     //
+	Ripemd160Gas           = big.NewInt(600)     //
+	Ripemd160WordGas       = big.NewInt(120)     //
+	MinimumDifficulty      = big.NewInt(131072)  // The minimum that the difficulty may ever be.
+	CallCreateDepth        = big.NewInt(1024)    // Maximum depth of call/create stack.
+	ExpGas                 = big.NewInt(10)      // Once per EXP instuction.
+	LogGas                 = big.NewInt(375)     // Per LOG* operation.
+	CopyGas                = big.NewInt(3)       //
+	StackLimit             = big.NewInt(1024)    // Maximum size of VM stack allowed.
+	TierStepGas            = big.NewInt(0)       // Once per operation, for a selection of them.
+	LogTopicGas            = big.NewInt(375)     // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
+	CreateGas              = big.NewInt(32000)   // Once per CREATE operation & contract-creation transaction.
+	SuicideRefundGas       = big.NewInt(24000)   // Refunded following a suicide operation.
+	MemoryGas              = big.NewInt(3)       // Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
+	TxDataNonZeroGas       = big.NewInt(68)      // Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions.
+)