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-rw-r--r--core/vm/evm/gas_table.go536
1 files changed, 536 insertions, 0 deletions
diff --git a/core/vm/evm/gas_table.go b/core/vm/evm/gas_table.go
new file mode 100644
index 000000000..0087004cf
--- /dev/null
+++ b/core/vm/evm/gas_table.go
@@ -0,0 +1,536 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package evm
+
+import (
+ "github.com/dexon-foundation/dexon/common"
+ "github.com/dexon-foundation/dexon/common/math"
+ "github.com/dexon-foundation/dexon/core/vm"
+ "github.com/dexon-foundation/dexon/params"
+)
+
+// memoryGasCosts calculates the quadratic gas for memory expansion. It does so
+// only for the memory region that is expanded, not the total memory.
+func memoryGasCost(mem *vm.Memory, newMemSize uint64) (uint64, error) {
+
+ if newMemSize == 0 {
+ return 0, nil
+ }
+ // The maximum that will fit in a uint64 is max_word_count - 1
+ // anything above that will result in an overflow.
+ // Additionally, a newMemSize which results in a
+ // newMemSizeWords larger than 0x7ffffffff will cause the square operation
+ // to overflow.
+ // The constant 0xffffffffe0 is the highest number that can be used without
+ // overflowing the gas calculation
+ if newMemSize > 0xffffffffe0 {
+ return 0, errGasUintOverflow
+ }
+
+ newMemSizeWords := vm.ToWordSize(newMemSize)
+ newMemSize = newMemSizeWords * 32
+
+ if newMemSize > uint64(mem.Len()) {
+ square := newMemSizeWords * newMemSizeWords
+ linCoef := newMemSizeWords * params.MemoryGas
+ quadCoef := square / params.QuadCoeffDiv
+ newTotalFee := linCoef + quadCoef
+
+ fee := newTotalFee - mem.LastGasCost
+ mem.LastGasCost = newTotalFee
+
+ return fee, nil
+ }
+ return 0, nil
+}
+
+func constGasFunc(gas uint64) gasFunc {
+ return func(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return gas, nil
+ }
+}
+
+func gasCallDataCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ words, overflow := vm.BigUint64(stack.Back(2))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if words, overflow = math.SafeMul(vm.ToWordSize(words), params.CopyGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if gas, overflow = math.SafeAdd(gas, words); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasReturnDataCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ words, overflow := vm.BigUint64(stack.Back(2))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if words, overflow = math.SafeMul(vm.ToWordSize(words), params.CopyGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if gas, overflow = math.SafeAdd(gas, words); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasSStore(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var (
+ y, x = stack.Back(1), stack.Back(0)
+ current = evm.StateDB.GetState(contract.Address(), common.BigToHash(x))
+ )
+ // The legacy gas metering only takes into consideration the current state
+ // Legacy rules should be applied if we are in Petersburg (removal of EIP-1283)
+ // OR Constantinople is not active
+ if evm.chainRules.IsPetersburg || !evm.chainRules.IsConstantinople {
+ // This checks for 3 scenario's and calculates gas accordingly:
+ //
+ // 1. From a zero-value address to a non-zero value (NEW VALUE)
+ // 2. From a non-zero value address to a zero-value address (DELETE)
+ // 3. From a non-zero to a non-zero (CHANGE)
+ switch {
+ case current == (common.Hash{}) && y.Sign() != 0: // 0 => non 0
+ return params.SstoreSetGas, nil
+ case current != (common.Hash{}) && y.Sign() == 0: // non 0 => 0
+ evm.StateDB.AddRefund(params.SstoreRefundGas)
+ return params.SstoreClearGas, nil
+ default: // non 0 => non 0 (or 0 => 0)
+ return params.SstoreResetGas, nil
+ }
+ }
+ // The new gas metering is based on net gas costs (EIP-1283):
+ //
+ // 1. If current value equals new value (this is a no-op), 200 gas is deducted.
+ // 2. If current value does not equal new value
+ // 2.1. If original value equals current value (this storage slot has not been changed by the current execution context)
+ // 2.1.1. If original value is 0, 20000 gas is deducted.
+ // 2.1.2. Otherwise, 5000 gas is deducted. If new value is 0, add 15000 gas to refund counter.
+ // 2.2. If original value does not equal current value (this storage slot is dirty), 200 gas is deducted. Apply both of the following clauses.
+ // 2.2.1. If original value is not 0
+ // 2.2.1.1. If current value is 0 (also means that new value is not 0), remove 15000 gas from refund counter. We can prove that refund counter will never go below 0.
+ // 2.2.1.2. If new value is 0 (also means that current value is not 0), add 15000 gas to refund counter.
+ // 2.2.2. If original value equals new value (this storage slot is reset)
+ // 2.2.2.1. If original value is 0, add 19800 gas to refund counter.
+ // 2.2.2.2. Otherwise, add 4800 gas to refund counter.
+ value := common.BigToHash(y)
+ if current == value { // noop (1)
+ return params.NetSstoreNoopGas, nil
+ }
+ original := evm.StateDB.GetCommittedState(contract.Address(), common.BigToHash(x))
+ if original == current {
+ if original == (common.Hash{}) { // create slot (2.1.1)
+ return params.NetSstoreInitGas, nil
+ }
+ if value == (common.Hash{}) { // delete slot (2.1.2b)
+ evm.StateDB.AddRefund(params.NetSstoreClearRefund)
+ }
+ return params.NetSstoreCleanGas, nil // write existing slot (2.1.2)
+ }
+ if original != (common.Hash{}) {
+ if current == (common.Hash{}) { // recreate slot (2.2.1.1)
+ evm.StateDB.SubRefund(params.NetSstoreClearRefund)
+ } else if value == (common.Hash{}) { // delete slot (2.2.1.2)
+ evm.StateDB.AddRefund(params.NetSstoreClearRefund)
+ }
+ }
+ if original == value {
+ if original == (common.Hash{}) { // reset to original inexistent slot (2.2.2.1)
+ evm.StateDB.AddRefund(params.NetSstoreResetClearRefund)
+ } else { // reset to original existing slot (2.2.2.2)
+ evm.StateDB.AddRefund(params.NetSstoreResetRefund)
+ }
+ }
+ return params.NetSstoreDirtyGas, nil
+}
+
+func makeGasLog(n uint64) gasFunc {
+ return func(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ requestedSize, overflow := vm.BigUint64(stack.Back(1))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ if gas, overflow = math.SafeAdd(gas, params.LogGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, n*params.LogTopicGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ var memorySizeGas uint64
+ if memorySizeGas, overflow = math.SafeMul(requestedSize, params.LogDataGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, memorySizeGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+ }
+}
+
+func gasSha3(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ if gas, overflow = math.SafeAdd(gas, params.Sha3Gas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ wordGas, overflow := vm.BigUint64(stack.Back(1))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+ if wordGas, overflow = math.SafeMul(vm.ToWordSize(wordGas), params.Sha3WordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasCodeCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ wordGas, overflow := vm.BigUint64(stack.Back(2))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+ if wordGas, overflow = math.SafeMul(vm.ToWordSize(wordGas), params.CopyGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasExtCodeCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, gt.ExtcodeCopy); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ wordGas, overflow := vm.BigUint64(stack.Back(3))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if wordGas, overflow = math.SafeMul(vm.ToWordSize(wordGas), params.CopyGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasExtCodeHash(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return gt.ExtcodeHash, nil
+}
+
+func gasMLoad(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasMStore8(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasMStore(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasCreate(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, params.CreateGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasCreate2(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var overflow bool
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, params.Create2Gas); overflow {
+ return 0, errGasUintOverflow
+ }
+ wordGas, overflow := vm.BigUint64(stack.Back(2))
+ if overflow {
+ return 0, errGasUintOverflow
+ }
+ if wordGas, overflow = math.SafeMul(vm.ToWordSize(wordGas), params.Sha3WordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+ if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ return gas, nil
+}
+
+func gasBalance(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return gt.Balance, nil
+}
+
+func gasExtCodeSize(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return gt.ExtcodeSize, nil
+}
+
+func gasSLoad(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return gt.SLoad, nil
+}
+
+func gasExp(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ expByteLen := uint64((stack.Data[stack.Len()-2].BitLen() + 7) / 8)
+
+ var (
+ gas = expByteLen * gt.ExpByte // no overflow check required. Max is 256 * ExpByte gas
+ overflow bool
+ )
+ if gas, overflow = math.SafeAdd(gas, GasSlowStep); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasCall(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var (
+ gas = gt.Calls
+ transfersValue = stack.Back(2).Sign() != 0
+ address = common.BigToAddress(stack.Back(1))
+ eip158 = evm.ChainConfig().IsEIP158(evm.BlockNumber)
+ )
+ if eip158 {
+ if transfersValue && evm.StateDB.Empty(address) {
+ gas += params.CallNewAccountGas
+ }
+ } else if !evm.StateDB.Exist(address) {
+ gas += params.CallNewAccountGas
+ }
+ if transfersValue {
+ gas += params.CallValueTransferGas
+ }
+ memoryGas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, memoryGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ evm.callGasTemp, err = callGas(gt, contract.Gas, gas, stack.Back(0))
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, evm.callGasTemp); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasCallCode(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas := gt.Calls
+ if stack.Back(2).Sign() != 0 {
+ gas += params.CallValueTransferGas
+ }
+ memoryGas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, memoryGas); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ evm.callGasTemp, err = callGas(gt, contract.Gas, gas, stack.Back(0))
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, evm.callGasTemp); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasReturn(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return memoryGasCost(mem, memorySize)
+}
+
+func gasRevert(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return memoryGasCost(mem, memorySize)
+}
+
+func gasSuicide(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ var gas uint64
+ // EIP150 homestead gas reprice fork:
+ if evm.ChainConfig().IsEIP150(evm.BlockNumber) {
+ gas = gt.Suicide
+ var (
+ address = common.BigToAddress(stack.Back(0))
+ eip158 = evm.ChainConfig().IsEIP158(evm.BlockNumber)
+ )
+
+ if eip158 {
+ // if empty and transfers value
+ if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).Sign() != 0 {
+ gas += gt.CreateBySuicide
+ }
+ } else if !evm.StateDB.Exist(address) {
+ gas += gt.CreateBySuicide
+ }
+ }
+
+ if !evm.StateDB.HasSuicided(contract.Address()) {
+ evm.StateDB.AddRefund(params.SuicideRefundGas)
+ }
+ return gas, nil
+}
+
+func gasDelegateCall(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, gt.Calls); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ evm.callGasTemp, err = callGas(gt, contract.Gas, gas, stack.Back(0))
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, evm.callGasTemp); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasStaticCall(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ gas, err := memoryGasCost(mem, memorySize)
+ if err != nil {
+ return 0, err
+ }
+ var overflow bool
+ if gas, overflow = math.SafeAdd(gas, gt.Calls); overflow {
+ return 0, errGasUintOverflow
+ }
+
+ evm.callGasTemp, err = callGas(gt, contract.Gas, gas, stack.Back(0))
+ if err != nil {
+ return 0, err
+ }
+ if gas, overflow = math.SafeAdd(gas, evm.callGasTemp); overflow {
+ return 0, errGasUintOverflow
+ }
+ return gas, nil
+}
+
+func gasPush(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return GasFastestStep, nil
+}
+
+func gasSwap(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return GasFastestStep, nil
+}
+
+func gasDup(gt params.GasTable, evm *EVM, contract *Contract, stack *vm.Stack, mem *vm.Memory, memorySize uint64) (uint64, error) {
+ return GasFastestStep, nil
+}
generated by cgit (git 2.34.1) at 2024-11-12 14:01:12 +0800