mirror of https://github.com/ethereum/go-ethereum
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.
64 lines
1014 B
64 lines
1014 B
package vm
|
|
|
|
import (
|
|
"fmt"
|
|
"math/big"
|
|
)
|
|
|
|
func newStack() *stack {
|
|
return &stack{}
|
|
}
|
|
|
|
type stack struct {
|
|
data []*big.Int
|
|
ptr int
|
|
}
|
|
|
|
func (st *stack) push(d *big.Int) {
|
|
if len(st.data) > st.ptr {
|
|
st.data[st.ptr] = d
|
|
} else {
|
|
st.data = append(st.data, d)
|
|
}
|
|
st.ptr++
|
|
}
|
|
|
|
func (st *stack) pop() (ret *big.Int) {
|
|
st.ptr--
|
|
ret = st.data[st.ptr]
|
|
return
|
|
}
|
|
|
|
func (st *stack) len() int {
|
|
return st.ptr
|
|
}
|
|
|
|
func (st *stack) swap(n int) {
|
|
st.data[st.len()-n], st.data[st.len()-1] = st.data[st.len()-1], st.data[st.len()-n]
|
|
}
|
|
|
|
func (st *stack) dup(n int) {
|
|
st.push(st.data[st.len()-n])
|
|
}
|
|
|
|
func (st *stack) peek() *big.Int {
|
|
return st.data[st.len()-1]
|
|
}
|
|
|
|
func (st *stack) require(n int) {
|
|
if st.len() < n {
|
|
panic(fmt.Sprintf("stack underflow (%d <=> %d)", len(st.data), n))
|
|
}
|
|
}
|
|
|
|
func (st *stack) Print() {
|
|
fmt.Println("### stack ###")
|
|
if len(st.data) > 0 {
|
|
for i, val := range st.data {
|
|
fmt.Printf("%-3d %v\n", i, val)
|
|
}
|
|
} else {
|
|
fmt.Println("-- empty --")
|
|
}
|
|
fmt.Println("#############")
|
|
}
|
|
|