aboutsummaryrefslogtreecommitdiffstats
path: root/vm/stack.go
blob: f20470db36d14ed884dc0d317a38e2e3f4ac8c70 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
package vm

import (
    "fmt"
    "math"
    "math/big"
)

type OpType int

const (
    tNorm = iota
    tData
    tExtro
    tCrypto
)

type TxCallback func(opType OpType) bool

// Simple push/pop stack mechanism
type Stack struct {
    data []*big.Int
}

func NewStack() *Stack {
    return &Stack{}
}

func (st *Stack) Data() []*big.Int {
    return st.data
}

func (st *Stack) Len() int {
    return len(st.data)
}

func (st *Stack) Pop() *big.Int {
    str := st.data[len(st.data)-1]

    copy(st.data[:len(st.data)-1], st.data[:len(st.data)-1])
    st.data = st.data[:len(st.data)-1]

    return str
}

func (st *Stack) Popn() (*big.Int, *big.Int) {
    ints := st.data[len(st.data)-2:]

    copy(st.data[:len(st.data)-2], st.data[:len(st.data)-2])
    st.data = st.data[:len(st.data)-2]

    return ints[0], ints[1]
}

func (st *Stack) Peek() *big.Int {
    str := st.data[len(st.data)-1]

    return str
}

func (st *Stack) Peekn() (*big.Int, *big.Int) {
    ints := st.data[len(st.data)-2:]

    return ints[0], ints[1]
}

func (st *Stack) Swapn(n int) (*big.Int, *big.Int) {
    st.data[len(st.data)-n], st.data[len(st.data)-1] = st.data[len(st.data)-1], st.data[len(st.data)-n]

    return st.data[len(st.data)-n], st.data[len(st.data)-1]
}

func (st *Stack) Dupn(n int) *big.Int {
    st.Push(st.data[len(st.data)-n])

    return st.Peek()
}

func (st *Stack) Push(d *big.Int) {
    st.data = append(st.data, new(big.Int).Set(d))
}

func (st *Stack) Get(amount *big.Int) []*big.Int {
    // offset + size <= len(data)
    length := big.NewInt(int64(len(st.data)))
    if amount.Cmp(length) <= 0 {
        start := new(big.Int).Sub(length, amount)
        return st.data[start.Int64():length.Int64()]
    }

    return nil
}

func (st *Stack) require(n int) {
    if st.Len() < n {
        panic(fmt.Sprintf("stack underflow (%d <=> %d)", st.Len(), 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("#############")
}

type Memory struct {
    store []byte
}

func NewMemory() *Memory {
    return &Memory{nil}
}

func (m *Memory) Set(offset, size uint64, value []byte) {
    if len(value) > 0 {
        totSize := offset + size
        lenSize := uint64(len(m.store) - 1)
        if totSize > lenSize {
            // Calculate the diff between the sizes
            diff := totSize - lenSize
            if diff > 0 {
                // Create a new empty slice and append it
                newSlice := make([]byte, diff-1)
                // Resize slice
                m.store = append(m.store, newSlice...)
            }
        }
        copy(m.store[offset:offset+size], value)
    }
}

func (m *Memory) Resize(size uint64) {
    if uint64(m.Len()) < size {
        m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
    }
}

func (m *Memory) Get(offset, size int64) []byte {
    if len(m.store) > int(offset) {
        end := int(math.Min(float64(len(m.store)), float64(offset+size)))

        return m.store[offset:end]
    }

    return nil
}

func (self *Memory) Geti(offset, size int64) (cpy []byte) {
    if size == 0 {
        return nil
    }

    if len(self.store) > int(offset) {
        cpy = make([]byte, size)
        copy(cpy, self.store[offset:offset+size])

        return
    }

    return
}

func (m *Memory) Len() int {
    return len(m.store)
}

func (m *Memory) Data() []byte {
    return m.store
}

func (m *Memory) Print() {
    fmt.Printf("### mem %d bytes ###\n", len(m.store))
    if len(m.store) > 0 {
        addr := 0
        for i := 0; i+32 <= len(m.store); i += 32 {
            fmt.Printf("%03d: % x\n", addr, m.store[i:i+32])
            addr++
        }
    } else {
        fmt.Println("-- empty --")
    }
    fmt.Println("####################")
}