1 files changed, 86 insertions, 0 deletions
diff --git a/vm/gas.go b/vm/gas.go
new file mode 100644
index 000000000..a19afeb67
--- /dev/null
+++ b/vm/gas.go
@@ -0,0 +1,86 @@
+package vm
+
+import "math/big"
+
+type req struct {
+	stack int
+	gas   *big.Int
+}
+
+var _baseCheck = map[OpCode]req{
+	//       Req stack  Gas price
+	ADD:          {2, GasFastestStep},
+	LT:           {2, GasFastestStep},
+	GT:           {2, GasFastestStep},
+	SLT:          {2, GasFastestStep},
+	SGT:          {2, GasFastestStep},
+	EQ:           {2, GasFastestStep},
+	ISZERO:       {1, GasFastestStep},
+	SUB:          {2, GasFastestStep},
+	AND:          {2, GasFastestStep},
+	OR:           {2, GasFastestStep},
+	XOR:          {2, GasFastestStep},
+	NOT:          {1, GasFastestStep},
+	BYTE:         {2, GasFastestStep},
+	CALLDATALOAD: {1, GasFastestStep},
+	CALLDATACOPY: {3, GasFastestStep},
+	MLOAD:        {1, GasFastestStep},
+	MSTORE:       {2, GasFastestStep},
+	MSTORE8:      {2, GasFastestStep},
+	CODECOPY:     {3, GasFastestStep},
+	MUL:          {2, GasFastStep},
+	DIV:          {2, GasFastStep},
+	SDIV:         {2, GasFastStep},
+	MOD:          {2, GasFastStep},
+	SMOD:         {2, GasFastStep},
+	SIGNEXTEND:   {2, GasFastStep},
+	ADDMOD:       {3, GasMidStep},
+	MULMOD:       {3, GasMidStep},
+	JUMP:         {1, GasMidStep},
+	JUMPI:        {2, GasSlowStep},
+	EXP:          {2, GasSlowStep},
+	ADDRESS:      {0, GasQuickStep},
+	ORIGIN:       {0, GasQuickStep},
+	CALLER:       {0, GasQuickStep},
+	CALLVALUE:    {0, GasQuickStep},
+	CODESIZE:     {0, GasQuickStep},
+	GASPRICE:     {0, GasQuickStep},
+	COINBASE:     {0, GasQuickStep},
+	TIMESTAMP:    {0, GasQuickStep},
+	NUMBER:       {0, GasQuickStep},
+	CALLDATASIZE: {0, GasQuickStep},
+	DIFFICULTY:   {0, GasQuickStep},
+	GASLIMIT:     {0, GasQuickStep},
+	POP:          {0, GasQuickStep},
+	PC:           {0, GasQuickStep},
+	MSIZE:        {0, GasQuickStep},
+	GAS:          {0, GasQuickStep},
+	BLOCKHASH:    {1, GasExtStep},
+	BALANCE:      {0, GasExtStep},
+	EXTCODESIZE:  {1, GasExtStep},
+	EXTCODECOPY:  {4, GasExtStep},
+	SLOAD:        {1, GasStorageGet},
+	SSTORE:       {2, Zero},
+	SHA3:         {1, GasSha3Base},
+	CREATE:       {3, GasCreate},
+	CALL:         {7, GasCall},
+	CALLCODE:     {7, GasCall},
+	JUMPDEST:     {0, GasJumpDest},
+	SUICIDE:      {1, Zero},
+	RETURN:       {2, Zero},
+}
+
+func baseCheck(op OpCode, stack *stack, gas *big.Int) {
+	if r, ok := _baseCheck[op]; ok {
+		stack.require(r.stack)
+
+		gas.Add(gas, r.gas)
+	}
+}
+
+func toWordSize(size *big.Int) *big.Int {
+	tmp := new(big.Int)
+	tmp.Add(size, u256(31))
+	tmp.Div(tmp, u256(32))
+	return tmp
+}