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path: root/core/vm/gas.go
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package vm

import (
    "fmt"
    "math/big"
)

var (
    GasQuickStep   = big.NewInt(2)
    GasFastestStep = big.NewInt(3)
    GasFastStep    = big.NewInt(5)
    GasMidStep     = big.NewInt(8)
    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)

    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)
)

func baseCheck(op OpCode, stack *stack, gas *big.Int) error {
    // PUSH and DUP are a bit special. They all cost the same but we do want to have checking on stack push limit
    // PUSH is also allowed to calculate the same price for all PUSHes
    // DUP requirements are handled elsewhere (except for the stack limit check)
    if op >= PUSH1 && op <= PUSH32 {
        op = PUSH1
    }
    if op >= SWAP1 && op <= SWAP16 {
        op = SWAP1
    }

    if r, ok := _baseCheck[op]; ok {
        err := stack.require(r.stackPop)
        if err != nil {
            return err
        }

        if r.stackPush && len(stack.data)-r.stackPop == 1024 {
            return fmt.Errorf("stack limit reached (%d)", maxStack)
        }

        gas.Add(gas, r.gas)
    }
    return nil
}

func toWordSize(size *big.Int) *big.Int {
    tmp := new(big.Int)
    tmp.Add(size, u256(31))
    tmp.Div(tmp, u256(32))
    return tmp
}

type req struct {
    stackPop  int
    gas       *big.Int
    stackPush bool
}

var _baseCheck = map[OpCode]req{
    // opcode  |  stack pop | gas price | stack push
    ADD:          {2, GasFastestStep, true},
    LT:           {2, GasFastestStep, true},
    GT:           {2, GasFastestStep, true},
    SLT:          {2, GasFastestStep, true},
    SGT:          {2, GasFastestStep, true},
    EQ:           {2, GasFastestStep, true},
    ISZERO:       {1, GasFastestStep, true},
    SUB:          {2, GasFastestStep, true},
    AND:          {2, GasFastestStep, true},
    OR:           {2, GasFastestStep, true},
    XOR:          {2, GasFastestStep, true},
    NOT:          {1, GasFastestStep, true},
    BYTE:         {2, GasFastestStep, true},
    CALLDATALOAD: {1, GasFastestStep, true},
    CALLDATACOPY: {3, GasFastestStep, true},
    MLOAD:        {1, GasFastestStep, true},
    MSTORE:       {2, GasFastestStep, false},
    MSTORE8:      {2, GasFastestStep, false},
    CODECOPY:     {3, GasFastestStep, false},
    MUL:          {2, GasFastStep, true},
    DIV:          {2, GasFastStep, true},
    SDIV:         {2, GasFastStep, true},
    MOD:          {2, GasFastStep, true},
    SMOD:         {2, GasFastStep, true},
    SIGNEXTEND:   {2, GasFastStep, true},
    ADDMOD:       {3, GasMidStep, true},
    MULMOD:       {3, GasMidStep, true},
    JUMP:         {1, GasMidStep, false},
    JUMPI:        {2, GasSlowStep, false},
    EXP:          {2, GasSlowStep, true},
    ADDRESS:      {0, GasQuickStep, true},
    ORIGIN:       {0, GasQuickStep, true},
    CALLER:       {0, GasQuickStep, true},
    CALLVALUE:    {0, GasQuickStep, true},
    CODESIZE:     {0, GasQuickStep, true},
    GASPRICE:     {0, GasQuickStep, true},
    COINBASE:     {0, GasQuickStep, true},
    TIMESTAMP:    {0, GasQuickStep, true},
    NUMBER:       {0, GasQuickStep, true},
    CALLDATASIZE: {0, GasQuickStep, true},
    DIFFICULTY:   {0, GasQuickStep, true},
    GASLIMIT:     {0, GasQuickStep, true},
    POP:          {1, GasQuickStep, false},
    PC:           {0, GasQuickStep, true},
    MSIZE:        {0, GasQuickStep, true},
    GAS:          {0, GasQuickStep, true},
    BLOCKHASH:    {1, GasExtStep, true},
    BALANCE:      {0, GasExtStep, true},
    EXTCODESIZE:  {1, GasExtStep, true},
    EXTCODECOPY:  {4, GasExtStep, false},
    SLOAD:        {1, GasStorageGet, true},
    SSTORE:       {2, Zero, false},
    SHA3:         {1, GasSha3Base, true},
    CREATE:       {3, GasCreate, true},
    CALL:         {7, GasCall, true},
    CALLCODE:     {7, GasCall, true},
    JUMPDEST:     {0, GasJumpDest, false},
    SUICIDE:      {1, Zero, false},
    RETURN:       {2, Zero, false},
    PUSH1:        {0, GasFastStep, true},
    DUP1:         {0, Zero, true},
}