diff options
Diffstat (limited to 'core/vm/vm.go')
-rw-r--r-- | core/vm/vm.go | 897 |
1 files changed, 897 insertions, 0 deletions
diff --git a/core/vm/vm.go b/core/vm/vm.go new file mode 100644 index 000000000..f4bf1ca72 --- /dev/null +++ b/core/vm/vm.go @@ -0,0 +1,897 @@ +package vm + +import ( + "fmt" + "math/big" + + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/crypto" + "github.com/ethereum/go-ethereum/core/state" +) + +type Vm struct { + env Environment + + logTy byte + logStr string + + err error + // For logging + debug bool + + BreakPoints []int64 + Stepping bool + Fn string + + Recoverable bool +} + +func New(env Environment) *Vm { + lt := LogTyPretty + + return &Vm{debug: Debug, env: env, logTy: lt, Recoverable: true} +} + +func (self *Vm) Run(context *Context, callData []byte) (ret []byte, err error) { + self.env.SetDepth(self.env.Depth() + 1) + var ( + caller = context.caller + code = context.Code + value = context.value + price = context.Price + ) + + self.Printf("(%d) (%x) %x (code=%d) gas: %v (d) %x", self.env.Depth(), caller.Address().Bytes()[:4], context.Address(), len(code), context.Gas, callData).Endl() + + if self.Recoverable { + // Recover from any require exception + defer func() { + if r := recover(); r != nil { + self.Printf(" %v", r).Endl() + + context.UseGas(context.Gas) + + ret = context.Return(nil) + + err = fmt.Errorf("%v", r) + } + }() + } + + if context.CodeAddr != nil { + if p := Precompiled[context.CodeAddr.Str()]; p != nil { + return self.RunPrecompiled(p, callData, context) + } + } + + var ( + op OpCode + + destinations = analyseJumpDests(context.Code) + mem = NewMemory() + stack = newStack() + pc uint64 = 0 + step = 0 + statedb = self.env.State() + + jump = func(from uint64, to *big.Int) { + p := to.Uint64() + + nop := context.GetOp(p) + if !destinations.Has(p) { + panic(fmt.Sprintf("invalid jump destination (%v) %v", nop, p)) + } + + self.Printf(" ~> %v", to) + pc = to.Uint64() + + self.Endl() + } + ) + + // Don't bother with the execution if there's no code. + if len(code) == 0 { + return context.Return(nil), nil + } + + for { + // The base for all big integer arithmetic + base := new(big.Int) + + step++ + // Get the memory location of pc + op = context.GetOp(pc) + + self.Printf("(pc) %-3d -o- %-14s (m) %-4d (s) %-4d ", pc, op.String(), mem.Len(), stack.len()) + newMemSize, gas := self.calculateGasAndSize(context, caller, op, statedb, mem, stack) + + self.Printf("(g) %-3v (%v)", gas, context.Gas) + + if !context.UseGas(gas) { + self.Endl() + + tmp := new(big.Int).Set(context.Gas) + + context.UseGas(context.Gas) + + return context.Return(nil), OOG(gas, tmp) + } + + mem.Resize(newMemSize.Uint64()) + + switch op { + // 0x20 range + case ADD: + x, y := stack.pop(), stack.pop() + self.Printf(" %v + %v", y, x) + + base.Add(x, y) + + U256(base) + + self.Printf(" = %v", base) + // pop result back on the stack + stack.push(base) + case SUB: + x, y := stack.pop(), stack.pop() + self.Printf(" %v - %v", y, x) + + base.Sub(x, y) + + U256(base) + + self.Printf(" = %v", base) + // pop result back on the stack + stack.push(base) + case MUL: + x, y := stack.pop(), stack.pop() + self.Printf(" %v * %v", y, x) + + base.Mul(x, y) + + U256(base) + + self.Printf(" = %v", base) + // pop result back on the stack + stack.push(base) + case DIV: + x, y := stack.pop(), stack.pop() + self.Printf(" %v / %v", x, y) + + if y.Cmp(common.Big0) != 0 { + base.Div(x, y) + } + + U256(base) + + self.Printf(" = %v", base) + // pop result back on the stack + stack.push(base) + case SDIV: + x, y := S256(stack.pop()), S256(stack.pop()) + + self.Printf(" %v / %v", x, y) + + if y.Cmp(common.Big0) == 0 { + base.Set(common.Big0) + } else { + n := new(big.Int) + if new(big.Int).Mul(x, y).Cmp(common.Big0) < 0 { + n.SetInt64(-1) + } else { + n.SetInt64(1) + } + + base.Div(x.Abs(x), y.Abs(y)).Mul(base, n) + + U256(base) + } + + self.Printf(" = %v", base) + stack.push(base) + case MOD: + x, y := stack.pop(), stack.pop() + + self.Printf(" %v %% %v", x, y) + + if y.Cmp(common.Big0) == 0 { + base.Set(common.Big0) + } else { + base.Mod(x, y) + } + + U256(base) + + self.Printf(" = %v", base) + stack.push(base) + case SMOD: + x, y := S256(stack.pop()), S256(stack.pop()) + + self.Printf(" %v %% %v", x, y) + + if y.Cmp(common.Big0) == 0 { + base.Set(common.Big0) + } else { + n := new(big.Int) + if x.Cmp(common.Big0) < 0 { + n.SetInt64(-1) + } else { + n.SetInt64(1) + } + + base.Mod(x.Abs(x), y.Abs(y)).Mul(base, n) + + U256(base) + } + + self.Printf(" = %v", base) + stack.push(base) + + case EXP: + x, y := stack.pop(), stack.pop() + + self.Printf(" %v ** %v", x, y) + + base.Exp(x, y, Pow256) + + U256(base) + + self.Printf(" = %v", base) + + stack.push(base) + case SIGNEXTEND: + back := stack.pop() + if back.Cmp(big.NewInt(31)) < 0 { + bit := uint(back.Uint64()*8 + 7) + num := stack.pop() + mask := new(big.Int).Lsh(common.Big1, bit) + mask.Sub(mask, common.Big1) + if common.BitTest(num, int(bit)) { + num.Or(num, mask.Not(mask)) + } else { + num.And(num, mask) + } + + num = U256(num) + + self.Printf(" = %v", num) + + stack.push(num) + } + case NOT: + stack.push(U256(new(big.Int).Not(stack.pop()))) + //base.Sub(Pow256, stack.pop()).Sub(base, common.Big1) + //base = U256(base) + //stack.push(base) + case LT: + x, y := stack.pop(), stack.pop() + self.Printf(" %v < %v", x, y) + // x < y + if x.Cmp(y) < 0 { + stack.push(common.BigTrue) + } else { + stack.push(common.BigFalse) + } + case GT: + x, y := stack.pop(), stack.pop() + self.Printf(" %v > %v", x, y) + + // x > y + if x.Cmp(y) > 0 { + stack.push(common.BigTrue) + } else { + stack.push(common.BigFalse) + } + + case SLT: + x, y := S256(stack.pop()), S256(stack.pop()) + self.Printf(" %v < %v", x, y) + // x < y + if x.Cmp(S256(y)) < 0 { + stack.push(common.BigTrue) + } else { + stack.push(common.BigFalse) + } + case SGT: + x, y := S256(stack.pop()), S256(stack.pop()) + self.Printf(" %v > %v", x, y) + + // x > y + if x.Cmp(y) > 0 { + stack.push(common.BigTrue) + } else { + stack.push(common.BigFalse) + } + + case EQ: + x, y := stack.pop(), stack.pop() + self.Printf(" %v == %v", y, x) + + // x == y + if x.Cmp(y) == 0 { + stack.push(common.BigTrue) + } else { + stack.push(common.BigFalse) + } + case ISZERO: + x := stack.pop() + if x.Cmp(common.BigFalse) > 0 { + stack.push(common.BigFalse) + } else { + stack.push(common.BigTrue) + } + + // 0x10 range + case AND: + x, y := stack.pop(), stack.pop() + self.Printf(" %v & %v", y, x) + + stack.push(base.And(x, y)) + case OR: + x, y := stack.pop(), stack.pop() + self.Printf(" %v | %v", x, y) + + stack.push(base.Or(x, y)) + case XOR: + x, y := stack.pop(), stack.pop() + self.Printf(" %v ^ %v", x, y) + + stack.push(base.Xor(x, y)) + case BYTE: + th, val := stack.pop(), stack.pop() + + if th.Cmp(big.NewInt(32)) < 0 { + byt := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()])) + + base.Set(byt) + } else { + base.Set(common.BigFalse) + } + + self.Printf(" => 0x%x", base.Bytes()) + + stack.push(base) + case ADDMOD: + x := stack.pop() + y := stack.pop() + z := stack.pop() + + if z.Cmp(Zero) > 0 { + add := new(big.Int).Add(x, y) + base.Mod(add, z) + + base = U256(base) + } + + self.Printf(" %v + %v %% %v = %v", x, y, z, base) + + stack.push(base) + case MULMOD: + x := stack.pop() + y := stack.pop() + z := stack.pop() + + if z.Cmp(Zero) > 0 { + mul := new(big.Int).Mul(x, y) + base.Mod(mul, z) + + U256(base) + } + + self.Printf(" %v + %v %% %v = %v", x, y, z, base) + + stack.push(base) + + // 0x20 range + case SHA3: + offset, size := stack.pop(), stack.pop() + data := crypto.Sha3(mem.Get(offset.Int64(), size.Int64())) + + stack.push(common.BigD(data)) + + self.Printf(" => (%v) %x", size, data) + // 0x30 range + case ADDRESS: + stack.push(common.Bytes2Big(context.Address().Bytes())) + + self.Printf(" => %x", context.Address()) + case BALANCE: + addr := common.BigToAddress(stack.pop()) + balance := statedb.GetBalance(addr) + + stack.push(balance) + + self.Printf(" => %v (%x)", balance, addr) + case ORIGIN: + origin := self.env.Origin() + + stack.push(origin.Big()) + + self.Printf(" => %x", origin) + case CALLER: + caller := context.caller.Address() + stack.push(common.Bytes2Big(caller.Bytes())) + + self.Printf(" => %x", caller) + case CALLVALUE: + stack.push(value) + + self.Printf(" => %v", value) + case CALLDATALOAD: + var ( + offset = stack.pop() + data = make([]byte, 32) + lenData = big.NewInt(int64(len(callData))) + ) + + if lenData.Cmp(offset) >= 0 { + length := new(big.Int).Add(offset, common.Big32) + length = common.BigMin(length, lenData) + + copy(data, callData[offset.Int64():length.Int64()]) + } + + self.Printf(" => 0x%x", data) + + stack.push(common.BigD(data)) + case CALLDATASIZE: + l := int64(len(callData)) + stack.push(big.NewInt(l)) + + self.Printf(" => %d", l) + case CALLDATACOPY: + var ( + mOff = stack.pop() + cOff = stack.pop() + l = stack.pop() + ) + data := getData(callData, cOff, l) + + mem.Set(mOff.Uint64(), l.Uint64(), data) + + self.Printf(" => [%v, %v, %v]", mOff, cOff, l) + case CODESIZE, EXTCODESIZE: + var code []byte + if op == EXTCODESIZE { + addr := common.BigToAddress(stack.pop()) + + code = statedb.GetCode(addr) + } else { + code = context.Code + } + + l := big.NewInt(int64(len(code))) + stack.push(l) + + self.Printf(" => %d", l) + case CODECOPY, EXTCODECOPY: + var code []byte + if op == EXTCODECOPY { + addr := common.BigToAddress(stack.pop()) + code = statedb.GetCode(addr) + } else { + code = context.Code + } + + var ( + mOff = stack.pop() + cOff = stack.pop() + l = stack.pop() + ) + + codeCopy := getData(code, cOff, l) + + mem.Set(mOff.Uint64(), l.Uint64(), codeCopy) + + self.Printf(" => [%v, %v, %v] %x", mOff, cOff, l, codeCopy) + case GASPRICE: + stack.push(context.Price) + + self.Printf(" => %x", context.Price) + + // 0x40 range + case BLOCKHASH: + num := stack.pop() + + n := new(big.Int).Sub(self.env.BlockNumber(), common.Big257) + if num.Cmp(n) > 0 && num.Cmp(self.env.BlockNumber()) < 0 { + stack.push(self.env.GetHash(num.Uint64()).Big()) + } else { + stack.push(common.Big0) + } + + self.Printf(" => 0x%x", stack.peek().Bytes()) + case COINBASE: + coinbase := self.env.Coinbase() + + stack.push(coinbase.Big()) + + self.Printf(" => 0x%x", coinbase) + case TIMESTAMP: + time := self.env.Time() + + stack.push(big.NewInt(time)) + + self.Printf(" => 0x%x", time) + case NUMBER: + number := self.env.BlockNumber() + + stack.push(U256(number)) + + self.Printf(" => 0x%x", number.Bytes()) + case DIFFICULTY: + difficulty := self.env.Difficulty() + + stack.push(difficulty) + + self.Printf(" => 0x%x", difficulty.Bytes()) + case GASLIMIT: + self.Printf(" => %v", self.env.GasLimit()) + + stack.push(self.env.GasLimit()) + + // 0x50 range + case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32: + a := uint64(op - PUSH1 + 1) + byts := context.GetRangeValue(pc+1, a) + // push value to stack + stack.push(common.BigD(byts)) + pc += a + + step += int(op) - int(PUSH1) + 1 + + self.Printf(" => 0x%x", byts) + case POP: + stack.pop() + case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16: + n := int(op - DUP1 + 1) + stack.dup(n) + + self.Printf(" => [%d] 0x%x", n, stack.peek().Bytes()) + case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16: + n := int(op - SWAP1 + 2) + stack.swap(n) + + self.Printf(" => [%d]", n) + case LOG0, LOG1, LOG2, LOG3, LOG4: + n := int(op - LOG0) + topics := make([]common.Hash, n) + mStart, mSize := stack.pop(), stack.pop() + for i := 0; i < n; i++ { + topics[i] = common.BigToHash(stack.pop()) //common.LeftPadBytes(stack.pop().Bytes(), 32) + } + + data := mem.Get(mStart.Int64(), mSize.Int64()) + log := &Log{context.Address(), topics, data, self.env.BlockNumber().Uint64()} + self.env.AddLog(log) + + self.Printf(" => %v", log) + case MLOAD: + offset := stack.pop() + val := common.BigD(mem.Get(offset.Int64(), 32)) + stack.push(val) + + self.Printf(" => 0x%x", val.Bytes()) + case MSTORE: // Store the value at stack top-1 in to memory at location stack top + // pop value of the stack + mStart, val := stack.pop(), stack.pop() + mem.Set(mStart.Uint64(), 32, common.BigToBytes(val, 256)) + + self.Printf(" => 0x%x", val) + case MSTORE8: + off, val := stack.pop().Int64(), stack.pop().Int64() + + mem.store[off] = byte(val & 0xff) + + self.Printf(" => [%v] 0x%x", off, mem.store[off]) + case SLOAD: + loc := common.BigToHash(stack.pop()) + val := common.Bytes2Big(statedb.GetState(context.Address(), loc)) + stack.push(val) + + self.Printf(" {0x%x : 0x%x}", loc, val.Bytes()) + case SSTORE: + loc := common.BigToHash(stack.pop()) + val := stack.pop() + + statedb.SetState(context.Address(), loc, val) + + self.Printf(" {0x%x : 0x%x}", loc, val.Bytes()) + case JUMP: + jump(pc, stack.pop()) + + continue + case JUMPI: + pos, cond := stack.pop(), stack.pop() + + if cond.Cmp(common.BigTrue) >= 0 { + jump(pc, pos) + + continue + } + + self.Printf(" ~> false") + + case JUMPDEST: + case PC: + stack.push(big.NewInt(int64(pc))) + case MSIZE: + stack.push(big.NewInt(int64(mem.Len()))) + case GAS: + stack.push(context.Gas) + + self.Printf(" => %x", context.Gas) + // 0x60 range + case CREATE: + + var ( + value = stack.pop() + offset, size = stack.pop(), stack.pop() + input = mem.Get(offset.Int64(), size.Int64()) + gas = new(big.Int).Set(context.Gas) + addr common.Address + ) + self.Endl() + + context.UseGas(context.Gas) + ret, suberr, ref := self.env.Create(context, nil, input, gas, price, value) + if suberr != nil { + stack.push(common.BigFalse) + + self.Printf(" (*) 0x0 %v", suberr) + } else { + + // gas < len(ret) * CreateDataGas == NO_CODE + dataGas := big.NewInt(int64(len(ret))) + dataGas.Mul(dataGas, GasCreateByte) + if context.UseGas(dataGas) { + ref.SetCode(ret) + } + addr = ref.Address() + + stack.push(addr.Big()) + + } + + case CALL, CALLCODE: + gas := stack.pop() + // pop gas and value of the stack. + addr, value := stack.pop(), stack.pop() + value = U256(value) + // pop input size and offset + inOffset, inSize := stack.pop(), stack.pop() + // pop return size and offset + retOffset, retSize := stack.pop(), stack.pop() + + address := common.BigToAddress(addr) + self.Printf(" => %x", address).Endl() + + // Get the arguments from the memory + args := mem.Get(inOffset.Int64(), inSize.Int64()) + + if len(value.Bytes()) > 0 { + gas.Add(gas, GasStipend) + } + + var ( + ret []byte + err error + ) + if op == CALLCODE { + ret, err = self.env.CallCode(context, address, args, gas, price, value) + } else { + ret, err = self.env.Call(context, address, args, gas, price, value) + } + + if err != nil { + stack.push(common.BigFalse) + + self.Printf("%v").Endl() + } else { + stack.push(common.BigTrue) + + mem.Set(retOffset.Uint64(), retSize.Uint64(), ret) + } + self.Printf("resume %x (%v)", context.Address(), context.Gas) + case RETURN: + offset, size := stack.pop(), stack.pop() + ret := mem.Get(offset.Int64(), size.Int64()) + + self.Printf(" => [%v, %v] (%d) 0x%x", offset, size, len(ret), ret).Endl() + + return context.Return(ret), nil + case SUICIDE: + receiver := statedb.GetOrNewStateObject(common.BigToAddress(stack.pop())) + balance := statedb.GetBalance(context.Address()) + + self.Printf(" => (%x) %v", receiver.Address().Bytes()[:4], balance) + + receiver.AddBalance(balance) + + statedb.Delete(context.Address()) + + fallthrough + case STOP: // Stop the context + self.Endl() + + return context.Return(nil), nil + default: + self.Printf("(pc) %-3v Invalid opcode %x\n", pc, op).Endl() + + panic(fmt.Errorf("Invalid opcode %x", op)) + } + + pc++ + + self.Endl() + } +} + +func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCode, statedb *state.StateDB, mem *Memory, stack *stack) (*big.Int, *big.Int) { + var ( + gas = new(big.Int) + newMemSize *big.Int = new(big.Int) + ) + baseCheck(op, stack, gas) + + // stack Check, memory resize & gas phase + switch op { + case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32: + gas.Set(GasFastestStep) + case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16: + n := int(op - SWAP1 + 2) + stack.require(n) + gas.Set(GasFastestStep) + case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16: + n := int(op - DUP1 + 1) + stack.require(n) + gas.Set(GasFastestStep) + case LOG0, LOG1, LOG2, LOG3, LOG4: + n := int(op - LOG0) + stack.require(n + 2) + + mSize, mStart := stack.data[stack.len()-2], stack.data[stack.len()-1] + + gas.Add(gas, GasLogBase) + gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(n)), GasLogTopic)) + gas.Add(gas, new(big.Int).Mul(mSize, GasLogByte)) + + newMemSize = calcMemSize(mStart, mSize) + case EXP: + gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(len(stack.data[stack.len()-2].Bytes()))), GasExpByte)) + case SSTORE: + stack.require(2) + + var g *big.Int + y, x := stack.data[stack.len()-2], stack.data[stack.len()-1] + val := statedb.GetState(context.Address(), common.BigToHash(x)) + if len(val) == 0 && len(y.Bytes()) > 0 { + // 0 => non 0 + g = GasStorageAdd + } else if len(val) > 0 && len(y.Bytes()) == 0 { + statedb.Refund(self.env.Origin(), RefundStorage) + + g = GasStorageMod + } else { + // non 0 => non 0 (or 0 => 0) + g = GasStorageMod + } + gas.Set(g) + case SUICIDE: + if !statedb.IsDeleted(context.Address()) { + statedb.Refund(self.env.Origin(), RefundSuicide) + } + case MLOAD: + newMemSize = calcMemSize(stack.peek(), u256(32)) + case MSTORE8: + newMemSize = calcMemSize(stack.peek(), u256(1)) + case MSTORE: + newMemSize = calcMemSize(stack.peek(), u256(32)) + case RETURN: + newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2]) + case SHA3: + newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2]) + + words := toWordSize(stack.data[stack.len()-2]) + gas.Add(gas, words.Mul(words, GasSha3Word)) + case CALLDATACOPY: + newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3]) + + words := toWordSize(stack.data[stack.len()-3]) + gas.Add(gas, words.Mul(words, GasCopyWord)) + case CODECOPY: + newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3]) + + words := toWordSize(stack.data[stack.len()-3]) + gas.Add(gas, words.Mul(words, GasCopyWord)) + case EXTCODECOPY: + newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-4]) + + words := toWordSize(stack.data[stack.len()-4]) + gas.Add(gas, words.Mul(words, GasCopyWord)) + + case CREATE: + newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-3]) + case CALL, CALLCODE: + gas.Add(gas, stack.data[stack.len()-1]) + + if op == CALL { + if self.env.State().GetStateObject(common.BigToAddress(stack.data[stack.len()-2])) == nil { + gas.Add(gas, GasCallNewAccount) + } + } + + if len(stack.data[stack.len()-3].Bytes()) > 0 { + gas.Add(gas, GasCallValueTransfer) + } + + x := calcMemSize(stack.data[stack.len()-6], stack.data[stack.len()-7]) + y := calcMemSize(stack.data[stack.len()-4], stack.data[stack.len()-5]) + + newMemSize = common.BigMax(x, y) + } + + if newMemSize.Cmp(common.Big0) > 0 { + newMemSizeWords := toWordSize(newMemSize) + newMemSize.Mul(newMemSizeWords, u256(32)) + + if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 { + oldSize := toWordSize(big.NewInt(int64(mem.Len()))) + pow := new(big.Int).Exp(oldSize, common.Big2, Zero) + linCoef := new(big.Int).Mul(oldSize, GasMemWord) + quadCoef := new(big.Int).Div(pow, GasQuadCoeffDenom) + oldTotalFee := new(big.Int).Add(linCoef, quadCoef) + + pow.Exp(newMemSizeWords, common.Big2, Zero) + linCoef = new(big.Int).Mul(newMemSizeWords, GasMemWord) + quadCoef = new(big.Int).Div(pow, GasQuadCoeffDenom) + newTotalFee := new(big.Int).Add(linCoef, quadCoef) + + gas.Add(gas, new(big.Int).Sub(newTotalFee, oldTotalFee)) + } + } + + return newMemSize, gas +} + +func (self *Vm) RunPrecompiled(p *PrecompiledAccount, callData []byte, context *Context) (ret []byte, err error) { + gas := p.Gas(len(callData)) + if context.UseGas(gas) { + ret = p.Call(callData) + self.Printf("NATIVE_FUNC => %x", ret) + self.Endl() + + return context.Return(ret), nil + } else { + self.Printf("NATIVE_FUNC => failed").Endl() + + tmp := new(big.Int).Set(context.Gas) + + panic(OOG(gas, tmp).Error()) + } +} + +func (self *Vm) Printf(format string, v ...interface{}) VirtualMachine { + if self.debug { + if self.logTy == LogTyPretty { + self.logStr += fmt.Sprintf(format, v...) + } + } + + return self +} + +func (self *Vm) Endl() VirtualMachine { + if self.debug { + if self.logTy == LogTyPretty { + vmlogger.Infoln(self.logStr) + self.logStr = "" + } + } + + return self +} + +func (self *Vm) Env() Environment { + return self.env +} |