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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/**
* Copyright 2023 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package rt
import (
`fmt`
`strings`
`unsafe`
)
type Bitmap struct {
N int
B []byte
}
func (self *Bitmap) grow() {
if self.N >= len(self.B) * 8 {
self.B = append(self.B, 0)
}
}
func (self *Bitmap) mark(i int, bv int) {
if bv != 0 {
self.B[i / 8] |= 1 << (i % 8)
} else {
self.B[i / 8] &^= 1 << (i % 8)
}
}
func (self *Bitmap) Set(i int, bv int) {
if i >= self.N {
panic("bitmap: invalid bit position")
} else {
self.mark(i, bv)
}
}
func (self *Bitmap) Append(bv int) {
self.grow()
self.mark(self.N, bv)
self.N++
}
func (self *Bitmap) AppendMany(n int, bv int) {
for i := 0; i < n; i++ {
self.Append(bv)
}
}
func (b *Bitmap) String() string {
var buf strings.Builder
for _, byteVal := range b.B {
fmt.Fprintf(&buf, "%08b ", byteVal)
}
return fmt.Sprintf("Bits: %s(total %d bits, %d bytes)", buf.String(), b.N, len(b.B))
}
type BitVec struct {
N uintptr
B unsafe.Pointer
}
func (self BitVec) Bit(i uintptr) byte {
return (*(*byte)(unsafe.Pointer(uintptr(self.B) + i / 8)) >> (i % 8)) & 1
}
func (self BitVec) String() string {
var i uintptr
var v []string
/* add each bit */
for i = 0; i < self.N; i++ {
v = append(v, fmt.Sprintf("%d", self.Bit(i)))
}
/* join them together */
return fmt.Sprintf(
"BitVec { %s }",
strings.Join(v, ", "),
)
}
/*
reference Golang 1.22.0 code:
```
args := bitvec.New(int32(maxArgs / int64(types.PtrSize)))
aoff := objw.Uint32(&argsSymTmp, 0, uint32(len(lv.stackMaps))) // number of bitmaps
aoff = objw.Uint32(&argsSymTmp, aoff, uint32(args.N)) // number of bits in each bitmap
locals := bitvec.New(int32(maxLocals / int64(types.PtrSize)))
loff := objw.Uint32(&liveSymTmp, 0, uint32(len(lv.stackMaps))) // number of bitmaps
loff = objw.Uint32(&liveSymTmp, loff, uint32(locals.N)) // number of bits in each bitmap
for _, live := range lv.stackMaps {
args.Clear()
locals.Clear()
lv.pointerMap(live, lv.vars, args, locals)
aoff = objw.BitVec(&argsSymTmp, aoff, args)
loff = objw.BitVec(&liveSymTmp, loff, locals)
}
```
*/
type StackMap struct {
// number of bitmaps
N int32
// number of bits of each bitmap
L int32
// bitmap1, bitmap2, ... bitmapN
B [1]byte
}
func (self *StackMap) Get(i int) BitVec {
return BitVec {
N: uintptr(self.L),
B: unsafe.Pointer(uintptr(unsafe.Pointer(&self.B)) + uintptr(i * self.BitmapBytes())),
}
}
func (self *StackMap) String() string {
sb := strings.Builder{}
sb.WriteString("StackMap {")
/* dump every stack map */
for i := 0; i < int(self.N); i++ {
sb.WriteRune('\n')
sb.WriteString(" " + self.Get(i).String())
}
/* close the stackmap */
sb.WriteString("\n}")
return sb.String()
}
func (self *StackMap) BitmapLen() int {
return int(self.L)
}
func (self *StackMap) BitmapBytes() int {
return int(self.L + 7) >> 3
}
func (self *StackMap) BitmapNums() int {
return int(self.N)
}
func (self *StackMap) StackMapHeaderSize() int {
return int(unsafe.Sizeof(self.L)) + int(unsafe.Sizeof(self.N))
}
func (self *StackMap) MarshalBinary() ([]byte, error) {
size := self.BinaryLen()
return BytesFrom(unsafe.Pointer(self), size, size), nil
}
func (self *StackMap) BinaryLen() int {
return self.StackMapHeaderSize() + self.BitmapBytes() * self.BitmapNums()
}
var (
byteType = UnpackEface(byte(0)).Type
)
const (
_StackMapSize = unsafe.Sizeof(StackMap{})
)
//go:linkname mallocgc runtime.mallocgc
//goland:noinspection GoUnusedParameter
func mallocgc(nb uintptr, vt *GoType, zero bool) unsafe.Pointer
type StackMapBuilder struct {
b Bitmap
}
//go:nocheckptr
func (self *StackMapBuilder) Build() (p *StackMap) {
nb := len(self.b.B)
allocatedSize := _StackMapSize + uintptr(nb) - 1
bm := mallocgc(allocatedSize, byteType, false)
/* initialize as 1 bitmap of N bits */
p = (*StackMap)(bm)
p.N, p.L = 1, int32(self.b.N)
copy(BytesFrom(unsafe.Pointer(&p.B), nb, nb), self.b.B)
/* assert length */
if allocatedSize < uintptr(p.BinaryLen()) {
panic(fmt.Sprintf("stackmap allocation too small: allocated %d, required %d", allocatedSize, p.BinaryLen()))
}
return
}
func (self *StackMapBuilder) AddField(ptr bool) {
if ptr {
self.b.Append(1)
} else {
self.b.Append(0)
}
}
func (self *StackMapBuilder) AddFields(n int, ptr bool) {
if ptr {
self.b.AppendMany(n, 1)
} else {
self.b.AppendMany(n, 0)
}
}
|
