You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
1.9 KiB
118 lines
1.9 KiB
package vm
|
|
|
|
import (
|
|
"fmt"
|
|
. "github.com/tendermint/tendermint/common"
|
|
)
|
|
|
|
// Not goroutine safe
|
|
type Stack struct {
|
|
data []Word256
|
|
ptr int
|
|
|
|
gas *uint64
|
|
err *error
|
|
}
|
|
|
|
func NewStack(capacity int, gas *uint64, err *error) *Stack {
|
|
return &Stack{
|
|
data: make([]Word256, capacity),
|
|
ptr: 0,
|
|
gas: gas,
|
|
err: err,
|
|
}
|
|
}
|
|
|
|
func (st *Stack) useGas(gasToUse uint64) {
|
|
if *st.gas > gasToUse {
|
|
*st.gas -= gasToUse
|
|
} else {
|
|
st.setErr(ErrInsufficientGas)
|
|
}
|
|
}
|
|
|
|
func (st *Stack) setErr(err error) {
|
|
if *st.err == nil {
|
|
*st.err = err
|
|
}
|
|
}
|
|
|
|
func (st *Stack) Push(d Word256) {
|
|
st.useGas(GasStackOp)
|
|
if st.ptr == cap(st.data) {
|
|
st.setErr(ErrDataStackOverflow)
|
|
return
|
|
}
|
|
st.data[st.ptr] = d
|
|
st.ptr++
|
|
}
|
|
|
|
func (st *Stack) PushBytes(bz []byte) {
|
|
if len(bz) != 32 {
|
|
panic("Invalid bytes size: expected 32")
|
|
}
|
|
st.Push(RightPadWord256(bz))
|
|
}
|
|
|
|
func (st *Stack) Push64(i uint64) {
|
|
st.Push(Uint64ToWord256(i))
|
|
}
|
|
|
|
func (st *Stack) Pop() Word256 {
|
|
st.useGas(GasStackOp)
|
|
if st.ptr == 0 {
|
|
st.setErr(ErrDataStackUnderflow)
|
|
return Zero256
|
|
}
|
|
st.ptr--
|
|
return st.data[st.ptr]
|
|
}
|
|
|
|
func (st *Stack) PopBytes() []byte {
|
|
return st.Pop().Bytes()
|
|
}
|
|
|
|
func (st *Stack) Pop64() uint64 {
|
|
return GetUint64(st.Pop().Bytes())
|
|
}
|
|
|
|
func (st *Stack) Len() int {
|
|
return st.ptr
|
|
}
|
|
|
|
func (st *Stack) Swap(n int) {
|
|
st.useGas(GasStackOp)
|
|
if st.ptr < n {
|
|
st.setErr(ErrDataStackUnderflow)
|
|
return
|
|
}
|
|
st.data[st.ptr-n], st.data[st.ptr-1] = st.data[st.ptr-1], st.data[st.ptr-n]
|
|
return
|
|
}
|
|
|
|
func (st *Stack) Dup(n int) {
|
|
st.useGas(GasStackOp)
|
|
if st.ptr < n {
|
|
st.setErr(ErrDataStackUnderflow)
|
|
return
|
|
}
|
|
st.Push(st.data[st.ptr-n])
|
|
return
|
|
}
|
|
|
|
// Not an opcode, costs no gas.
|
|
func (st *Stack) Peek() Word256 {
|
|
return st.data[st.ptr-1]
|
|
}
|
|
|
|
func (st *Stack) Print() {
|
|
fmt.Println("### stack ###")
|
|
if st.ptr > 0 {
|
|
for i, val := range st.data {
|
|
fmt.Printf("%-3d %v\n", i, val)
|
|
}
|
|
} else {
|
|
fmt.Println("-- empty --")
|
|
}
|
|
fmt.Println("#############")
|
|
}
|