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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
|
// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// Package ast parses and formats sys files.
package ast
// Pos represents source info for AST nodes.
type Pos struct {
File string
Off int // byte offset, starting at 0
Line int // line number, starting at 1
Col int // column number, starting at 1 (byte count)
}
// Description contains top-level nodes of a parsed sys description.
type Description struct {
Nodes []Node
}
// Node is AST node interface.
type Node interface {
Info() (pos Pos, typ, name string)
// Clone makes a deep copy of the node.
Clone() Node
// walk calls callback cb for all child nodes of this node.
// Note: it's not recursive. Use Recursive helper for recursive walk.
walk(cb func(Node))
}
type Flags[T FlagValue] interface {
SetValues(values []T)
GetValues() []T
GetPos() Pos
}
type FlagValue interface {
GetName() string
}
// Top-level AST nodes.
type NewLine struct {
Pos Pos
}
func (n *NewLine) Info() (Pos, string, string) {
return n.Pos, tok2str[tokNewLine], ""
}
type Comment struct {
Pos Pos
Text string
}
func (n *Comment) Info() (Pos, string, string) {
return n.Pos, tok2str[tokComment], ""
}
type Meta struct {
Pos Pos
Value *Type
}
func (n *Meta) Info() (Pos, string, string) {
return n.Pos, "meta", n.Value.Ident
}
type Include struct {
Pos Pos
File *String
}
func (n *Include) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInclude], n.File.Value
}
type Incdir struct {
Pos Pos
Dir *String
}
func (n *Incdir) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInclude], ""
}
type Define struct {
Pos Pos
Name *Ident
Value *Int
}
func (n *Define) Info() (Pos, string, string) {
return n.Pos, tok2str[tokDefine], n.Name.Name
}
type Resource struct {
Pos Pos
Name *Ident
Base *Type
Values []*Int
}
func (n *Resource) Info() (Pos, string, string) {
return n.Pos, tok2str[tokResource], n.Name.Name
}
type Call struct {
Pos Pos
Name *Ident
CallName string
NR uint64
Args []*Field
Ret *Type
Attrs []*Type
}
func (n *Call) Info() (Pos, string, string) {
return n.Pos, "syscall", n.Name.Name
}
type Struct struct {
Pos Pos
Name *Ident
Fields []*Field
Attrs []*Type
Comments []*Comment
IsUnion bool
}
func (n *Struct) Info() (Pos, string, string) {
typ := "struct"
if n.IsUnion {
typ = "union"
}
return n.Pos, typ, n.Name.Name
}
type IntFlags struct {
Pos Pos
Name *Ident
Values []*Int
}
func (n *IntFlags) Info() (Pos, string, string) {
return n.Pos, "flags", n.Name.Name
}
func (n *IntFlags) SetValues(values []*Int) {
n.Values = values
}
func (n *IntFlags) GetValues() []*Int {
return n.Values
}
func (n *IntFlags) GetPos() Pos {
return n.Pos
}
type StrFlags struct {
Pos Pos
Name *Ident
Values []*String
}
func (n *StrFlags) Info() (Pos, string, string) {
return n.Pos, "string flags", n.Name.Name
}
func (n *StrFlags) SetValues(values []*String) {
n.Values = values
}
func (n *StrFlags) GetValues() []*String {
return n.Values
}
func (n *StrFlags) GetPos() Pos {
return n.Pos
}
type TypeDef struct {
Pos Pos
Name *Ident
// Non-template type aliases have only Type filled.
// Templates have Args and either Type or Struct filled.
Args []*Ident
Type *Type
Struct *Struct
}
func (n *TypeDef) Info() (Pos, string, string) {
return n.Pos, "type", n.Name.Name
}
// Not top-level AST nodes.
type Ident struct {
Pos Pos
Name string
}
func (n *Ident) Info() (Pos, string, string) {
return n.Pos, tok2str[tokIdent], n.Name
}
type String struct {
Pos Pos
Value string
Fmt StrFmt
}
func (n *String) Info() (Pos, string, string) {
return n.Pos, tok2str[tokString], ""
}
func (n *String) GetName() string {
return n.Value
}
type IntFmt int
const (
IntFmtDec IntFmt = iota
IntFmtNeg
IntFmtHex
IntFmtChar
)
type StrFmt int
const (
StrFmtRaw StrFmt = iota
StrFmtHex
StrFmtIdent
)
type Int struct {
Pos Pos
// Only one of Value, Ident, CExpr is filled.
Value uint64
ValueFmt IntFmt
Ident string
CExpr string
}
func (n *Int) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInt], ""
}
func (n *Int) GetName() string {
return n.Ident
}
type Operator int
const (
OperatorCompareEq = iota + 1
OperatorCompareNeq
OperatorBinaryAnd
OperatorOr
)
type BinaryExpression struct {
Pos Pos
Operator Operator
Left *Type
Right *Type
}
func (n *BinaryExpression) Info() (Pos, string, string) {
return n.Pos, "binary-expression", ""
}
type Type struct {
Pos Pos
// Only one of Value, Ident, String, Expression is filled.
Value uint64
ValueFmt IntFmt
Ident string
String string
StringFmt StrFmt
HasString bool
Expression *BinaryExpression
// Parts after COLON (for ranges and bitfields).
Colon []*Type
// Sub-types in [].
Args []*Type
}
func (n *Type) Info() (Pos, string, string) {
return n.Pos, "type-opt", n.Ident
}
type Field struct {
Pos Pos
Name *Ident
Type *Type
Attrs []*Type
NewBlock bool // separated from previous fields by a new line
Comments []*Comment
}
func (n *Field) Info() (Pos, string, string) {
return n.Pos, "arg/field", n.Name.Name
}
|
