5f7826270c
* common/math: optimize PaddedBigBytes, use it more
name old time/op new time/op delta
PaddedBigBytes-8 71.1ns ± 5% 46.1ns ± 1% -35.15% (p=0.000 n=20+19)
name old alloc/op new alloc/op delta
PaddedBigBytes-8 48.0B ± 0% 32.0B ± 0% -33.33% (p=0.000 n=20+20)
* all: unify big.Int zero checks
Various checks were in use. This commit replaces them all with Int.Sign,
which is cheaper and less code.
eg templates:
func before(x *big.Int) bool { return x.BitLen() == 0 }
func after(x *big.Int) bool { return x.Sign() == 0 }
func before(x *big.Int) bool { return x.BitLen() > 0 }
func after(x *big.Int) bool { return x.Sign() != 0 }
func before(x *big.Int) int { return x.Cmp(common.Big0) }
func after(x *big.Int) int { return x.Sign() }
* common/math, crypto/secp256k1: make ReadBits public in package math
417 lines
12 KiB
Go
417 lines
12 KiB
Go
package vm
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import (
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gmath "math"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/params"
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)
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// memoryGasCosts calculates the quadratic gas for memory expansion. It does so
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// only for the memory region that is expanded, not the total memory.
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func memoryGasCost(mem *Memory, newMemSize uint64) (uint64, error) {
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// The maximum that will fit in a uint64 is max_word_count - 1
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// anything above that will result in an overflow.
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if newMemSize > gmath.MaxUint64-32 {
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return 0, errGasUintOverflow
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}
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if newMemSize == 0 {
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return 0, nil
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}
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newMemSizeWords := toWordSize(newMemSize)
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newMemSize = newMemSizeWords * 32
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if newMemSize > uint64(mem.Len()) {
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square := newMemSizeWords * newMemSizeWords
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linCoef := newMemSizeWords * params.MemoryGas
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quadCoef := square / params.QuadCoeffDiv
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newTotalFee := linCoef + quadCoef
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fee := newTotalFee - mem.lastGasCost
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mem.lastGasCost = newTotalFee
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return fee, nil
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}
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return 0, nil
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}
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func constGasFunc(gas uint64) gasFunc {
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return func(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return gas, nil
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}
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}
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func gasCalldataCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
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return 0, errGasUintOverflow
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}
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words, overflow := bigUint64(stack.Back(2))
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if overflow {
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return 0, errGasUintOverflow
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}
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if words, overflow = math.SafeMul(toWordSize(words), params.CopyGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, words); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasSStore(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var (
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y, x = stack.Back(1), stack.Back(0)
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val = evm.StateDB.GetState(contract.Address(), common.BigToHash(x))
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)
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// This checks for 3 scenario's and calculates gas accordingly
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// 1. From a zero-value address to a non-zero value (NEW VALUE)
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// 2. From a non-zero value address to a zero-value address (DELETE)
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// 3. From a non-zero to a non-zero (CHANGE)
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if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
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// 0 => non 0
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return params.SstoreSetGas, nil
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} else if !common.EmptyHash(val) && common.EmptyHash(common.BigToHash(y)) {
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evm.StateDB.AddRefund(new(big.Int).SetUint64(params.SstoreRefundGas))
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return params.SstoreClearGas, nil
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} else {
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// non 0 => non 0 (or 0 => 0)
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return params.SstoreResetGas, nil
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}
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}
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func makeGasLog(n uint64) gasFunc {
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return func(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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requestedSize, overflow := bigUint64(stack.Back(1))
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if overflow {
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return 0, errGasUintOverflow
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}
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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if gas, overflow = math.SafeAdd(gas, params.LogGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, n*params.LogTopicGas); overflow {
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return 0, errGasUintOverflow
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}
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var memorySizeGas uint64
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if memorySizeGas, overflow = math.SafeMul(requestedSize, params.LogDataGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, memorySizeGas); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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}
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func gasSha3(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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if gas, overflow = math.SafeAdd(gas, params.Sha3Gas); overflow {
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return 0, errGasUintOverflow
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}
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wordGas, overflow := bigUint64(stack.Back(1))
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if overflow {
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return 0, errGasUintOverflow
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}
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if wordGas, overflow = math.SafeMul(toWordSize(wordGas), params.Sha3WordGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasCodeCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
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return 0, errGasUintOverflow
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}
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wordGas, overflow := bigUint64(stack.Back(2))
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if overflow {
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return 0, errGasUintOverflow
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}
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if wordGas, overflow = math.SafeMul(toWordSize(wordGas), params.CopyGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasExtCodeCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, gt.ExtcodeCopy); overflow {
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return 0, errGasUintOverflow
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}
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wordGas, overflow := bigUint64(stack.Back(3))
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if overflow {
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return 0, errGasUintOverflow
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}
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if wordGas, overflow = math.SafeMul(toWordSize(wordGas), params.CopyGas); overflow {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, wordGas); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasMLoad(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasMStore8(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasMStore(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, errGasUintOverflow
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}
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if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasCreate(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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if gas, overflow = math.SafeAdd(gas, params.CreateGas); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasBalance(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return gt.Balance, nil
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}
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func gasExtCodeSize(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return gt.ExtcodeSize, nil
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}
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func gasSLoad(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return gt.SLoad, nil
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}
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func gasExp(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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expByteLen := uint64((stack.data[stack.len()-2].BitLen() + 7) / 8)
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var (
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gas = expByteLen * gt.ExpByte // no overflow check required. Max is 256 * ExpByte gas
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overflow bool
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)
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if gas, overflow = math.SafeAdd(gas, GasSlowStep); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasCall(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var (
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gas = gt.Calls
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transfersValue = stack.Back(2).Sign() != 0
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address = common.BigToAddress(stack.Back(1))
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eip158 = evm.ChainConfig().IsEIP158(evm.BlockNumber)
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)
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if eip158 {
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if evm.StateDB.Empty(address) && transfersValue {
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gas += params.CallNewAccountGas
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}
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} else if !evm.StateDB.Exist(address) {
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gas += params.CallNewAccountGas
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}
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if transfersValue {
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gas += params.CallValueTransferGas
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}
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memoryGas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, memoryGas); overflow {
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return 0, errGasUintOverflow
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}
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cg, err := callGas(gt, contract.Gas, gas, stack.Back(0))
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if err != nil {
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return 0, err
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}
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// Replace the stack item with the new gas calculation. This means that
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// either the original item is left on the stack or the item is replaced by:
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// (availableGas - gas) * 63 / 64
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// We replace the stack item so that it's available when the opCall instruction is
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// called. This information is otherwise lost due to the dependency on *current*
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// available gas.
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stack.data[stack.len()-1] = new(big.Int).SetUint64(cg)
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if gas, overflow = math.SafeAdd(gas, cg); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasCallCode(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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gas := gt.Calls
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if stack.Back(2).Sign() != 0 {
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gas += params.CallValueTransferGas
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}
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memoryGas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, memoryGas); overflow {
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return 0, errGasUintOverflow
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}
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cg, err := callGas(gt, contract.Gas, gas, stack.Back(0))
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if err != nil {
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return 0, err
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}
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// Replace the stack item with the new gas calculation. This means that
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// either the original item is left on the stack or the item is replaced by:
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// (availableGas - gas) * 63 / 64
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// We replace the stack item so that it's available when the opCall instruction is
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// called. This information is otherwise lost due to the dependency on *current*
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// available gas.
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stack.data[stack.len()-1] = new(big.Int).SetUint64(cg)
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if gas, overflow = math.SafeAdd(gas, cg); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasReturn(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return memoryGasCost(mem, memorySize)
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}
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func gasSuicide(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var gas uint64
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// EIP150 homestead gas reprice fork:
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if evm.ChainConfig().IsEIP150(evm.BlockNumber) {
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gas = gt.Suicide
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var (
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address = common.BigToAddress(stack.Back(0))
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eip158 = evm.ChainConfig().IsEIP158(evm.BlockNumber)
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)
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if eip158 {
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// if empty and transfers value
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if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).Sign() != 0 {
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gas += gt.CreateBySuicide
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}
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} else if !evm.StateDB.Exist(address) {
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gas += gt.CreateBySuicide
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}
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}
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if !evm.StateDB.HasSuicided(contract.Address()) {
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evm.StateDB.AddRefund(new(big.Int).SetUint64(params.SuicideRefundGas))
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}
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return gas, nil
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}
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func gasDelegateCall(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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gas, err := memoryGasCost(mem, memorySize)
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if err != nil {
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return 0, err
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}
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var overflow bool
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if gas, overflow = math.SafeAdd(gas, gt.Calls); overflow {
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return 0, errGasUintOverflow
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}
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cg, err := callGas(gt, contract.Gas, gas, stack.Back(0))
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if err != nil {
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return 0, err
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}
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// Replace the stack item with the new gas calculation. This means that
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// either the original item is left on the stack or the item is replaced by:
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// (availableGas - gas) * 63 / 64
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// We replace the stack item so that it's available when the opCall instruction is
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// called.
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stack.data[stack.len()-1] = new(big.Int).SetUint64(cg)
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if gas, overflow = math.SafeAdd(gas, cg); overflow {
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return 0, errGasUintOverflow
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}
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return gas, nil
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}
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func gasPush(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return GasFastestStep, nil
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}
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func gasSwap(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return GasFastestStep, nil
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}
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func gasDup(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return GasFastestStep, nil
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}
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