-
Notifications
You must be signed in to change notification settings - Fork 0
/
iexport.go
260 lines (254 loc) · 6.8 KB
/
iexport.go
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
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Indexed package export.
//
// The indexed export data format is an evolution of the previous
// binary export data format. Its chief contribution is introducing an
// index table, which allows efficient random access of individual
// declarations and inline function bodies. In turn, this allows
// avoiding unnecessary work for compilation units that import large
// packages.
//
//
// The top-level data format is structured as:
//
// Header struct {
// Tag byte // 'i'
// Version uvarint
// StringSize uvarint
// DataSize uvarint
// }
//
// Strings [StringSize]byte
// Data [DataSize]byte
//
// MainIndex []struct{
// PkgPath stringOff
// PkgName stringOff
// PkgHeight uvarint
//
// Decls []struct{
// Name stringOff
// Offset declOff
// }
// }
//
// Fingerprint [8]byte
//
// uvarint means a uint64 written out using uvarint encoding.
//
// []T means a uvarint followed by that many T objects. In other
// words:
//
// Len uvarint
// Elems [Len]T
//
// stringOff means a uvarint that indicates an offset within the
// Strings section. At that offset is another uvarint, followed by
// that many bytes, which form the string value.
//
// declOff means a uvarint that indicates an offset within the Data
// section where the associated declaration can be found.
//
//
// There are five kinds of declarations, distinguished by their first
// byte:
//
// type Var struct {
// Tag byte // 'V'
// Pos Pos
// Type typeOff
// }
//
// type Func struct {
// Tag byte // 'F' or 'G'
// Pos Pos
// TypeParams []typeOff // only present if Tag == 'G'
// Signature Signature
// }
//
// type Const struct {
// Tag byte // 'C'
// Pos Pos
// Value Value
// }
//
// type Type struct {
// Tag byte // 'T' or 'U'
// Pos Pos
// TypeParams []typeOff // only present if Tag == 'U'
// Underlying typeOff
//
// Methods []struct{ // omitted if Underlying is an interface type
// Pos Pos
// Name stringOff
// Recv Param
// Signature Signature
// }
// }
//
// type Alias struct {
// Tag byte // 'A'
// Pos Pos
// Type typeOff
// }
//
// // "Automatic" declaration of each typeparam
// type TypeParam struct {
// Tag byte // 'P'
// Pos Pos
// Implicit bool
// Constraint typeOff
// }
//
// typeOff means a uvarint that either indicates a predeclared type,
// or an offset into the Data section. If the uvarint is less than
// predeclReserved, then it indicates the index into the predeclared
// types list (see predeclared in bexport.go for order). Otherwise,
// subtracting predeclReserved yields the offset of a type descriptor.
//
// Value means a type, kind, and type-specific value. See
// (*exportWriter).value for details.
//
//
// There are twelve kinds of type descriptors, distinguished by an itag:
//
// type DefinedType struct {
// Tag itag // definedType
// Name stringOff
// PkgPath stringOff
// }
//
// type PointerType struct {
// Tag itag // pointerType
// Elem typeOff
// }
//
// type SliceType struct {
// Tag itag // sliceType
// Elem typeOff
// }
//
// type ArrayType struct {
// Tag itag // arrayType
// Len uint64
// Elem typeOff
// }
//
// type ChanType struct {
// Tag itag // chanType
// Dir uint64 // 1 RecvOnly; 2 SendOnly; 3 SendRecv
// Elem typeOff
// }
//
// type MapType struct {
// Tag itag // mapType
// Key typeOff
// Elem typeOff
// }
//
// type FuncType struct {
// Tag itag // signatureType
// PkgPath stringOff
// Signature Signature
// }
//
// type StructType struct {
// Tag itag // structType
// PkgPath stringOff
// Fields []struct {
// Pos Pos
// Name stringOff
// Type typeOff
// Embedded bool
// Note stringOff
// }
// }
//
// type InterfaceType struct {
// Tag itag // interfaceType
// PkgPath stringOff
// Embeddeds []struct {
// Pos Pos
// Type typeOff
// }
// Methods []struct {
// Pos Pos
// Name stringOff
// Signature Signature
// }
// }
//
// // Reference to a type param declaration
// type TypeParamType struct {
// Tag itag // typeParamType
// Name stringOff
// PkgPath stringOff
// }
//
// // Instantiation of a generic type (like List[T2] or List[int])
// type InstanceType struct {
// Tag itag // instanceType
// Pos pos
// TypeArgs []typeOff
// BaseType typeOff
// }
//
// type UnionType struct {
// Tag itag // interfaceType
// Terms []struct {
// tilde bool
// Type typeOff
// }
// }
//
//
//
// type Signature struct {
// Params []Param
// Results []Param
// Variadic bool // omitted if Results is empty
// }
//
// type Param struct {
// Pos Pos
// Name stringOff
// Type typOff
// }
//
//
// Pos encodes a file:line:column triple, incorporating a simple delta
// encoding scheme within a data object. See exportWriter.pos for
// details.
//
//
// Compiler-specific details.
//
// cmd/compile writes out a second index for inline bodies and also
// appends additional compiler-specific details after declarations.
// Third-party tools are not expected to depend on these details and
// they're expected to change much more rapidly, so they're omitted
// here. See exportWriter's varExt/funcExt/etc methods for details.
package typecheck
import (
"strings"
)
const blankMarker = "$"
// TparamName returns the real name of a type parameter, after stripping its
// qualifying prefix and reverting blank-name encoding. See TparamExportName
// for details.
func TparamName(exportName string) string {
// Remove the "path" from the type param name that makes it unique.
ix := strings.LastIndex(exportName, ".")
if ix < 0 {
return ""
}
name := exportName[ix+1:]
if strings.HasPrefix(name, blankMarker) {
return "_"
}
return name
}
// The name used for dictionary parameters or local variables.
const LocalDictName = ".dict"