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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 >= DUP1 && op <= DUP16 {
op = DUP1
}
if r, ok := _baseCheck[op]; ok {
err := stack.require(r.stackPop)
if err != nil {
return err
}
if r.stackPush && len(stack.data)-r.stackPop+1 > 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, GasFastestStep, true},
DUP1: {0, Zero, true},
}
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