-
Notifications
You must be signed in to change notification settings - Fork 656
/
package.go
724 lines (637 loc) · 15.9 KB
/
package.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
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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
package main
import "debug/elf"
import "text/scanner"
import "bytes"
import "errors"
import "io"
import "fmt"
import "strconv"
import "go/ast"
import "go/token"
import "strings"
var builtin_type_names = []*ast.Ident{
nil,
ast.NewIdent("int8"),
ast.NewIdent("int16"),
ast.NewIdent("int32"),
ast.NewIdent("int64"),
ast.NewIdent("uint8"),
ast.NewIdent("uint16"),
ast.NewIdent("uint32"),
ast.NewIdent("uint64"),
ast.NewIdent("float32"),
ast.NewIdent("float64"),
ast.NewIdent("int"),
ast.NewIdent("uint"),
ast.NewIdent("uintptr"),
nil,
ast.NewIdent("bool"),
ast.NewIdent("string"),
ast.NewIdent("complex64"),
ast.NewIdent("complex128"),
ast.NewIdent("error"),
ast.NewIdent("byte"),
ast.NewIdent("rune"),
}
const (
smallest_builtin_code = -21
)
func read_import_data(import_path string) ([]byte, error) {
// TODO: find file location
filename := import_path + ".gox"
f, err := elf.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
sec := f.Section(".go_export")
if sec == nil {
return nil, errors.New("missing .go_export section in the file: " + filename)
}
return sec.Data()
}
func parse_import_data(data []byte) {
buf := bytes.NewBuffer(data)
var p import_data_parser
p.init(buf)
// magic
p.expect_ident("v1")
p.expect(';')
// package ident
p.expect_ident("package")
pkgid := p.expect(scanner.Ident)
p.expect(';')
println("package ident: " + pkgid)
// package path
p.expect_ident("pkgpath")
pkgpath := p.expect(scanner.Ident)
p.expect(';')
println("package path: " + pkgpath)
// package priority
p.expect_ident("priority")
priority := p.expect(scanner.Int)
p.expect(';')
println("package priority: " + priority)
// import init functions
for p.toktype == scanner.Ident && p.token() == "import" {
p.expect_ident("import")
pkgname := p.expect(scanner.Ident)
pkgpath := p.expect(scanner.Ident)
importpath := p.expect(scanner.String)
p.expect(';')
println("import " + pkgname + " " + pkgpath + " " + importpath)
}
if p.toktype == scanner.Ident && p.token() == "init" {
p.expect_ident("init")
for p.toktype != ';' {
pkgname := p.expect(scanner.Ident)
initname := p.expect(scanner.Ident)
prio := p.expect(scanner.Int)
println("init " + pkgname + " " + initname + " " + fmt.Sprint(prio))
}
p.expect(';')
}
loop:
for {
switch tok := p.expect(scanner.Ident); tok {
case "const":
p.read_const()
case "type":
p.read_type_decl()
case "var":
p.read_var()
case "func":
p.read_func()
case "checksum":
p.read_checksum()
break loop
default:
panic(errors.New("unexpected identifier token: '" + tok + "'"))
}
}
}
//----------------------------------------------------------------------------
// import data parser
//----------------------------------------------------------------------------
type import_data_type struct {
name string
type_ ast.Expr
}
type import_data_parser struct {
scanner scanner.Scanner
toktype rune
typetable []*import_data_type
}
func (this *import_data_parser) init(reader io.Reader) {
this.scanner.Mode = scanner.ScanIdents | scanner.ScanInts | scanner.ScanStrings | scanner.ScanFloats
this.scanner.Init(reader)
this.next()
// len == 1 here, because 0 is an invalid type index
this.typetable = make([]*import_data_type, 1, 50)
}
func (this *import_data_parser) next() {
this.toktype = this.scanner.Scan()
}
func (this *import_data_parser) token() string {
return this.scanner.TokenText()
}
// internal, use expect(scanner.Ident) instead
func (this *import_data_parser) read_ident() string {
id := ""
prev := rune(0)
loop:
for {
switch this.toktype {
case scanner.Ident:
if prev == scanner.Ident {
break loop
}
prev = this.toktype
id += this.token()
this.next()
case '.', '?', '$':
prev = this.toktype
id += string(this.toktype)
this.next()
default:
break loop
}
}
if id == "" {
this.errorf("identifier expected, got %s", scanner.TokenString(this.toktype))
}
return id
}
func (this *import_data_parser) read_int() string {
val := ""
if this.toktype == '-' {
this.next()
val += "-"
}
if this.toktype != scanner.Int {
this.errorf("expected: %s, got: %s", scanner.TokenString(scanner.Int), scanner.TokenString(this.toktype))
}
val += this.token()
this.next()
return val
}
func (this *import_data_parser) errorf(format string, args ...interface{}) {
panic(errors.New(fmt.Sprintf(format, args...)))
}
// makes sure that the current token is 'x', returns it and reads the next one
func (this *import_data_parser) expect(x rune) string {
if x == scanner.Ident {
// special case, in gccgo import data identifier is not exactly a scanner.Ident
return this.read_ident()
}
if x == scanner.Int {
// another special case, handle negative ints as well
return this.read_int()
}
if this.toktype != x {
this.errorf("expected: %s, got: %s", scanner.TokenString(x), scanner.TokenString(this.toktype))
}
tok := this.token()
this.next()
return tok
}
// makes sure that the following set of tokens matches 'special', reads the next one
func (this *import_data_parser) expect_special(special string) {
i := 0
for i < len(special) {
if this.toktype != rune(special[i]) {
break
}
this.next()
i++
}
if i < len(special) {
this.errorf("expected: \"%s\", got something else", special)
}
}
// makes sure that the current token is scanner.Ident and is equals to 'ident', reads the next one
func (this *import_data_parser) expect_ident(ident string) {
tok := this.expect(scanner.Ident)
if tok != ident {
this.errorf("expected identifier: \"%s\", got: \"%s\"", ident, tok)
}
}
func (this *import_data_parser) read_type() ast.Expr {
type_, name := this.read_type_full()
if name != "" {
return ast.NewIdent(name)
}
return type_
}
func (this *import_data_parser) read_type_full() (ast.Expr, string) {
this.expect('<')
this.expect_ident("type")
numstr := this.expect(scanner.Int)
num, err := strconv.ParseInt(numstr, 10, 32)
if err != nil {
panic(err)
}
if this.toktype == '>' {
// was already declared previously
this.next()
if num < 0 {
if num < smallest_builtin_code {
this.errorf("out of range built-in type code")
}
return builtin_type_names[-num], ""
} else {
// lookup type table
type_ := this.typetable[num]
return type_.type_, type_.name
}
}
this.typetable = append(this.typetable, &import_data_type{})
var type_ = this.typetable[len(this.typetable)-1]
switch this.toktype {
case scanner.String:
// named type
s := this.expect(scanner.String)
type_.name = s[1 : len(s)-1] // remove ""
fallthrough
default:
// unnamed type
switch this.toktype {
case scanner.Ident:
switch tok := this.token(); tok {
case "struct":
type_.type_ = this.read_struct_type()
case "interface":
type_.type_ = this.read_interface_type()
case "map":
type_.type_ = this.read_map_type()
case "chan":
type_.type_ = this.read_chan_type()
default:
this.errorf("unknown type class token: \"%s\"", tok)
}
case '[':
type_.type_ = this.read_array_or_slice_type()
case '*':
this.next()
if this.token() == "any" {
this.next()
type_.type_ = &ast.StarExpr{X: ast.NewIdent("any")}
} else {
type_.type_ = &ast.StarExpr{X: this.read_type()}
}
case '(':
type_.type_ = this.read_func_type()
case '<':
type_.type_ = this.read_type()
}
}
for this.toktype != '>' {
// must be a method or many methods
this.expect_ident("func")
this.read_method()
}
this.expect('>')
return type_.type_, type_.name
}
func (this *import_data_parser) read_map_type() ast.Expr {
this.expect_ident("map")
this.expect('[')
key := this.read_type()
this.expect(']')
val := this.read_type()
return &ast.MapType{Key: key, Value: val}
}
func (this *import_data_parser) read_chan_type() ast.Expr {
dir := ast.SEND | ast.RECV
this.expect_ident("chan")
switch this.toktype {
case '-':
// chan -< <type>
this.expect_special("-<")
dir = ast.SEND
case '<':
// slight ambiguity here
if this.scanner.Peek() == '-' {
// chan <- <type>
this.expect_special("<-")
dir = ast.RECV
}
// chan <type>
default:
this.errorf("unexpected token: \"%s\"", this.token())
}
return &ast.ChanType{Dir: dir, Value: this.read_type()}
}
func (this *import_data_parser) read_field() *ast.Field {
var tag string
name := this.expect(scanner.Ident)
type_ := this.read_type()
if this.toktype == scanner.String {
tag = this.expect(scanner.String)
}
return &ast.Field{
Names: []*ast.Ident{ast.NewIdent(name)},
Type: type_,
Tag: &ast.BasicLit{Kind: token.STRING, Value: tag},
}
}
func (this *import_data_parser) read_struct_type() ast.Expr {
var fields []*ast.Field
read_field := func() {
field := this.read_field()
fields = append(fields, field)
}
this.expect_ident("struct")
this.expect('{')
for this.toktype != '}' {
read_field()
this.expect(';')
}
this.expect('}')
return &ast.StructType{Fields: &ast.FieldList{List: fields}}
}
func (this *import_data_parser) read_parameter() *ast.Field {
name := this.expect(scanner.Ident)
var type_ ast.Expr
if this.toktype == '.' {
this.expect_special("...")
type_ = &ast.Ellipsis{Elt: this.read_type()}
} else {
type_ = this.read_type()
}
var tag string
if this.toktype == scanner.String {
tag = this.expect(scanner.String)
}
return &ast.Field{
Names: []*ast.Ident{ast.NewIdent(name)},
Type: type_,
Tag: &ast.BasicLit{Kind: token.STRING, Value: tag},
}
}
func (this *import_data_parser) read_parameters() *ast.FieldList {
var fields []*ast.Field
read_parameter := func() {
parameter := this.read_parameter()
fields = append(fields, parameter)
}
this.expect('(')
if this.toktype != ')' {
read_parameter()
for this.toktype == ',' {
this.next() // skip ','
read_parameter()
}
}
this.expect(')')
if fields == nil {
return nil
}
return &ast.FieldList{List: fields}
}
func (this *import_data_parser) read_func_type() *ast.FuncType {
var params, results *ast.FieldList
params = this.read_parameters()
switch this.toktype {
case '<':
field := &ast.Field{Type: this.read_type()}
results = &ast.FieldList{List: []*ast.Field{field}}
case '(':
results = this.read_parameters()
}
return &ast.FuncType{Params: params, Results: results}
}
func (this *import_data_parser) read_method_or_embed_spec() *ast.Field {
var type_ ast.Expr
name := this.expect(scanner.Ident)
if name == "?" {
// TODO: ast.SelectorExpr conversion here possibly
type_ = this.read_type()
} else {
type_ = this.read_func_type()
}
return &ast.Field{
Names: []*ast.Ident{ast.NewIdent(name)},
Type: type_,
}
}
func (this *import_data_parser) read_interface_type() ast.Expr {
var methods []*ast.Field
read_method := func() {
method := this.read_method_or_embed_spec()
methods = append(methods, method)
}
this.expect_ident("interface")
this.expect('{')
for this.toktype != '}' {
read_method()
this.expect(';')
}
this.expect('}')
return &ast.InterfaceType{Methods: &ast.FieldList{List: methods}}
}
func (this *import_data_parser) read_method() {
var buf1, buf2 bytes.Buffer
recv := this.read_parameters()
name := this.expect(scanner.Ident)
type_ := this.read_func_type()
this.expect(';')
pretty_print_type_expr(&buf1, recv.List[0].Type)
pretty_print_type_expr(&buf2, type_)
println("func (" + buf1.String() + ") " + name + buf2.String()[4:])
}
func (this *import_data_parser) read_array_or_slice_type() ast.Expr {
var length ast.Expr
this.expect('[')
if this.toktype == scanner.Int {
// array type
length = &ast.BasicLit{Kind: token.INT, Value: this.expect(scanner.Int)}
}
this.expect(']')
return &ast.ArrayType{
Len: length,
Elt: this.read_type(),
}
}
func (this *import_data_parser) read_const() {
var buf bytes.Buffer
// const keyword was already consumed
c := "const " + this.expect(scanner.Ident)
if this.toktype != '=' {
// parse type
type_ := this.read_type()
pretty_print_type_expr(&buf, type_)
c += " " + buf.String()
}
this.expect('=')
// parse expr
this.next()
this.expect(';')
println(c)
}
func (this *import_data_parser) read_checksum() {
// checksum keyword was already consumed
for this.toktype != ';' {
this.next()
}
this.expect(';')
}
func (this *import_data_parser) read_type_decl() {
var buf bytes.Buffer
// type keyword was already consumed
type_, name := this.read_type_full()
this.expect(';')
pretty_print_type_expr(&buf, type_)
println("type " + name + " " + buf.String())
}
func (this *import_data_parser) read_var() {
var buf bytes.Buffer
// var keyword was already consumed
name := this.expect(scanner.Ident)
type_ := this.read_type()
this.expect(';')
pretty_print_type_expr(&buf, type_)
println("var " + name + " " + buf.String())
}
func (this *import_data_parser) read_func() {
var buf bytes.Buffer
// func keyword was already consumed
name := this.expect(scanner.Ident)
type_ := this.read_func_type()
this.expect(';')
pretty_print_type_expr(&buf, type_)
println("func " + name + buf.String()[4:])
}
//-------------------------------------------------------------------------
// Pretty printing
//-------------------------------------------------------------------------
func get_array_len(e ast.Expr) string {
switch t := e.(type) {
case *ast.BasicLit:
return string(t.Value)
case *ast.Ellipsis:
return "..."
}
return ""
}
func pretty_print_type_expr(out io.Writer, e ast.Expr) {
switch t := e.(type) {
case *ast.StarExpr:
fmt.Fprintf(out, "*")
pretty_print_type_expr(out, t.X)
case *ast.Ident:
if strings.HasPrefix(t.Name, "$") {
// beautify anonymous types
switch t.Name[1] {
case 's':
fmt.Fprintf(out, "struct")
case 'i':
fmt.Fprintf(out, "interface")
}
} else {
fmt.Fprintf(out, t.Name)
}
case *ast.ArrayType:
al := ""
if t.Len != nil {
println(t.Len)
al = get_array_len(t.Len)
}
if al != "" {
fmt.Fprintf(out, "[%s]", al)
} else {
fmt.Fprintf(out, "[]")
}
pretty_print_type_expr(out, t.Elt)
case *ast.SelectorExpr:
pretty_print_type_expr(out, t.X)
fmt.Fprintf(out, ".%s", t.Sel.Name)
case *ast.FuncType:
fmt.Fprintf(out, "func(")
pretty_print_func_field_list(out, t.Params)
fmt.Fprintf(out, ")")
buf := bytes.NewBuffer(make([]byte, 0, 256))
nresults := pretty_print_func_field_list(buf, t.Results)
if nresults > 0 {
results := buf.String()
if strings.Index(results, ",") != -1 {
results = "(" + results + ")"
}
fmt.Fprintf(out, " %s", results)
}
case *ast.MapType:
fmt.Fprintf(out, "map[")
pretty_print_type_expr(out, t.Key)
fmt.Fprintf(out, "]")
pretty_print_type_expr(out, t.Value)
case *ast.InterfaceType:
fmt.Fprintf(out, "interface{}")
case *ast.Ellipsis:
fmt.Fprintf(out, "...")
pretty_print_type_expr(out, t.Elt)
case *ast.StructType:
fmt.Fprintf(out, "struct")
case *ast.ChanType:
switch t.Dir {
case ast.RECV:
fmt.Fprintf(out, "<-chan ")
case ast.SEND:
fmt.Fprintf(out, "chan<- ")
case ast.SEND | ast.RECV:
fmt.Fprintf(out, "chan ")
}
pretty_print_type_expr(out, t.Value)
case *ast.ParenExpr:
fmt.Fprintf(out, "(")
pretty_print_type_expr(out, t.X)
fmt.Fprintf(out, ")")
case *ast.BadExpr:
// TODO: probably I should check that in a separate function
// and simply discard declarations with BadExpr as a part of their
// type
default:
// should never happen
panic("unknown type")
}
}
func pretty_print_func_field_list(out io.Writer, f *ast.FieldList) int {
count := 0
if f == nil {
return count
}
for i, field := range f.List {
// names
if field.Names != nil {
hasNonblank := false
for j, name := range field.Names {
if name.Name != "?" {
hasNonblank = true
fmt.Fprintf(out, "%s", name.Name)
if j != len(field.Names)-1 {
fmt.Fprintf(out, ", ")
}
}
count++
}
if hasNonblank {
fmt.Fprintf(out, " ")
}
} else {
count++
}
// type
pretty_print_type_expr(out, field.Type)
// ,
if i != len(f.List)-1 {
fmt.Fprintf(out, ", ")
}
}
return count
}
func main() {
data, err := read_import_data("io")
if err != nil {
panic(err)
}
parse_import_data(data)
}