package vm import ( "fmt" "math/big" "github.com/ethereum/go-ethereum/params" ) 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) GasReturn = big.NewInt(0) GasStop = big.NewInt(0) GasContractByte = big.NewInt(200) ) 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 > int(params.StackLimit.Int64()) { return fmt.Errorf("stack limit reached %d (%d)", len(stack.data), params.StackLimit.Int64()) } 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: {1, GasExtStep, true}, EXTCODESIZE: {1, GasExtStep, true}, EXTCODECOPY: {4, GasExtStep, false}, SLOAD: {1, params.SloadGas, true}, SSTORE: {2, Zero, 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}, DUP1: {0, Zero, true}, }