diff options
Diffstat (limited to 'core/vm/gas.go')
| -rw-r--r-- | core/vm/gas.go | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/core/vm/gas.go b/core/vm/gas.go new file mode 100644 index 000000000..2d5d7ae18 --- /dev/null +++ b/core/vm/gas.go @@ -0,0 +1,159 @@ +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}, +} |