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core/vm: make a 0 alloc stack

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This commit is contained in:
Marius van der Wijden 2024-11-05 14:48:54 +01:00
parent 187f3cba26
commit cf2eb01815
2 changed files with 15 additions and 8 deletions
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4
core/vm/gas_table.go
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@ -345,7 +345,7 @@ func gasCreate2Eip3860(evm *EVM, contract *Contract, stack *Stack, mem *Memory,
} }
func gasExpFrontier(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { func gasExpFrontier(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
expByteLen := uint64((stack.Back(2).BitLen() + 7) / 8) expByteLen := uint64((stack.Back(1).BitLen() + 7) / 8)
var ( var (
gas = expByteLen * params.ExpByteFrontier // no overflow check required. Max is 256 * ExpByte gas gas = expByteLen * params.ExpByteFrontier // no overflow check required. Max is 256 * ExpByte gas
@ -358,7 +358,7 @@ func gasExpFrontier(evm *EVM, contract *Contract, stack *Stack, mem *Memory, mem
} }
func gasExpEIP158(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { func gasExpEIP158(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
expByteLen := uint64((stack.Back(2).BitLen() + 7) / 8) expByteLen := uint64((stack.Back(1).BitLen() + 7) / 8)
var ( var (
gas = expByteLen * params.ExpByteEIP158 // no overflow check required. Max is 256 * ExpByte gas gas = expByteLen * params.ExpByteEIP158 // no overflow check required. Max is 256 * ExpByte gas

17
core/vm/stack.go
View file

@ -24,7 +24,7 @@ import (
var stackPool = sync.Pool{ var stackPool = sync.Pool{
New: func() interface{} { New: func() interface{} {
return &Stack{data: make([]uint256.Int, 0, 16)} return &Stack{data: make([]uint256.Int, 0, 16), size: 0}
}, },
} }
@ -33,6 +33,7 @@ var stackPool = sync.Pool{
// initialized objects. // initialized objects.
type Stack struct { type Stack struct {
data []uint256.Int data []uint256.Int
size int
} }
func newstack() *Stack { func newstack() *Stack {
@ -41,27 +42,33 @@ func newstack() *Stack {
func returnStack(s *Stack) { func returnStack(s *Stack) {
s.data = s.data[:0] s.data = s.data[:0]
s.size = 0
stackPool.Put(s) stackPool.Put(s)
} }
// Data returns the underlying uint256.Int array. // Data returns the underlying uint256.Int array.
func (st *Stack) Data() []uint256.Int { func (st *Stack) Data() []uint256.Int {
return st.data return st.data[0:st.size]
} }
func (st *Stack) push(d *uint256.Int) { func (st *Stack) push(d *uint256.Int) {
// NOTE push limit (1024) is checked in baseCheck // NOTE push limit (1024) is checked in baseCheck
if st.size == len(st.data) {
st.data = append(st.data, *d) st.data = append(st.data, *d)
} else {
st.data[st.size] = *d
}
st.size++
} }
func (st *Stack) pop() (ret uint256.Int) { func (st *Stack) pop() (ret uint256.Int) {
ret = st.data[len(st.data)-1] ret = st.data[st.size-1]
st.data = st.data[:len(st.data)-1] st.size--
return return
} }
func (st *Stack) len() int { func (st *Stack) len() int {
return len(st.data) return st.size
} }
func (st *Stack) swap1() { func (st *Stack) swap1() {