-
Notifications
You must be signed in to change notification settings - Fork 17.3k
/
main.go
1591 lines (1398 loc) · 44.8 KB
/
main.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
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright 2009 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.
//go:generate go run mkbuiltin.go
package gc
import (
"bufio"
"bytes"
"cmd/compile/internal/logopt"
"cmd/compile/internal/ssa"
"cmd/compile/internal/types"
"cmd/internal/bio"
"cmd/internal/dwarf"
"cmd/internal/goobj2"
"cmd/internal/obj"
"cmd/internal/objabi"
"cmd/internal/src"
"cmd/internal/sys"
"flag"
"fmt"
"internal/goversion"
"io"
"io/ioutil"
"log"
"os"
"path"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
)
var imported_unsafe bool
var (
buildid string
spectre string
spectreIndex bool
)
var (
Debug_append int
Debug_checkptr int
Debug_closure int
Debug_compilelater int
debug_dclstack int
Debug_libfuzzer int
Debug_panic int
Debug_slice int
Debug_vlog bool
Debug_wb int
Debug_pctab string
Debug_locationlist int
Debug_typecheckinl int
Debug_gendwarfinl int
Debug_softfloat int
Debug_defer int
)
// Debug arguments.
// These can be specified with the -d flag, as in "-d nil"
// to set the debug_checknil variable.
// Multiple options can be comma-separated.
// Each option accepts an optional argument, as in "gcprog=2"
var debugtab = []struct {
name string
help string
val interface{} // must be *int or *string
}{
{"append", "print information about append compilation", &Debug_append},
{"checkptr", "instrument unsafe pointer conversions", &Debug_checkptr},
{"closure", "print information about closure compilation", &Debug_closure},
{"compilelater", "compile functions as late as possible", &Debug_compilelater},
{"disablenil", "disable nil checks", &disable_checknil},
{"dclstack", "run internal dclstack check", &debug_dclstack},
{"gcprog", "print dump of GC programs", &Debug_gcprog},
{"libfuzzer", "coverage instrumentation for libfuzzer", &Debug_libfuzzer},
{"nil", "print information about nil checks", &Debug_checknil},
{"panic", "do not hide any compiler panic", &Debug_panic},
{"slice", "print information about slice compilation", &Debug_slice},
{"typeassert", "print information about type assertion inlining", &Debug_typeassert},
{"wb", "print information about write barriers", &Debug_wb},
{"export", "print export data", &Debug_export},
{"pctab", "print named pc-value table", &Debug_pctab},
{"locationlists", "print information about DWARF location list creation", &Debug_locationlist},
{"typecheckinl", "eager typechecking of inline function bodies", &Debug_typecheckinl},
{"dwarfinl", "print information about DWARF inlined function creation", &Debug_gendwarfinl},
{"softfloat", "force compiler to emit soft-float code", &Debug_softfloat},
{"defer", "print information about defer compilation", &Debug_defer},
}
const debugHelpHeader = `usage: -d arg[,arg]* and arg is <key>[=<value>]
<key> is one of:
`
const debugHelpFooter = `
<value> is key-specific.
Key "checkptr" supports values:
"0": instrumentation disabled
"1": conversions involving unsafe.Pointer are instrumented
"2": conversions to unsafe.Pointer force heap allocation
Key "pctab" supports values:
"pctospadj", "pctofile", "pctoline", "pctoinline", "pctopcdata"
`
func usage() {
fmt.Fprintf(os.Stderr, "usage: compile [options] file.go...\n")
objabi.Flagprint(os.Stderr)
Exit(2)
}
func hidePanic() {
if Debug_panic == 0 && nsavederrors+nerrors > 0 {
// If we've already complained about things
// in the program, don't bother complaining
// about a panic too; let the user clean up
// the code and try again.
if err := recover(); err != nil {
errorexit()
}
}
}
// supportsDynlink reports whether or not the code generator for the given
// architecture supports the -shared and -dynlink flags.
func supportsDynlink(arch *sys.Arch) bool {
return arch.InFamily(sys.AMD64, sys.ARM, sys.ARM64, sys.I386, sys.PPC64, sys.S390X)
}
// timing data for compiler phases
var timings Timings
var benchfile string
var nowritebarrierrecCheck *nowritebarrierrecChecker
// Main parses flags and Go source files specified in the command-line
// arguments, type-checks the parsed Go package, compiles functions to machine
// code, and finally writes the compiled package definition to disk.
func Main(archInit func(*Arch)) {
timings.Start("fe", "init")
defer hidePanic()
archInit(&thearch)
Ctxt = obj.Linknew(thearch.LinkArch)
Ctxt.DiagFunc = yyerror
Ctxt.DiagFlush = flusherrors
Ctxt.Bso = bufio.NewWriter(os.Stdout)
// UseBASEntries is preferred because it shaves about 2% off build time, but LLDB, dsymutil, and dwarfdump
// on Darwin don't support it properly, especially since macOS 10.14 (Mojave). This is exposed as a flag
// to allow testing with LLVM tools on Linux, and to help with reporting this bug to the LLVM project.
// See bugs 31188 and 21945 (CLs 170638, 98075, 72371).
Ctxt.UseBASEntries = Ctxt.Headtype != objabi.Hdarwin
localpkg = types.NewPkg("", "")
localpkg.Prefix = "\"\""
// We won't know localpkg's height until after import
// processing. In the mean time, set to MaxPkgHeight to ensure
// height comparisons at least work until then.
localpkg.Height = types.MaxPkgHeight
// pseudo-package, for scoping
builtinpkg = types.NewPkg("go.builtin", "") // TODO(gri) name this package go.builtin?
builtinpkg.Prefix = "go.builtin" // not go%2ebuiltin
// pseudo-package, accessed by import "unsafe"
unsafepkg = types.NewPkg("unsafe", "unsafe")
// Pseudo-package that contains the compiler's builtin
// declarations for package runtime. These are declared in a
// separate package to avoid conflicts with package runtime's
// actual declarations, which may differ intentionally but
// insignificantly.
Runtimepkg = types.NewPkg("go.runtime", "runtime")
Runtimepkg.Prefix = "runtime"
// pseudo-packages used in symbol tables
itabpkg = types.NewPkg("go.itab", "go.itab")
itabpkg.Prefix = "go.itab" // not go%2eitab
itablinkpkg = types.NewPkg("go.itablink", "go.itablink")
itablinkpkg.Prefix = "go.itablink" // not go%2eitablink
trackpkg = types.NewPkg("go.track", "go.track")
trackpkg.Prefix = "go.track" // not go%2etrack
// pseudo-package used for map zero values
mappkg = types.NewPkg("go.map", "go.map")
mappkg.Prefix = "go.map"
// pseudo-package used for methods with anonymous receivers
gopkg = types.NewPkg("go", "")
Wasm := objabi.GOARCH == "wasm"
// Whether the limit for stack-allocated objects is much smaller than normal.
// This can be helpful for diagnosing certain causes of GC latency. See #27732.
smallFrames := false
jsonLogOpt := ""
flag.BoolVar(&compiling_runtime, "+", false, "compiling runtime")
flag.BoolVar(&compiling_std, "std", false, "compiling standard library")
objabi.Flagcount("%", "debug non-static initializers", &Debug['%'])
objabi.Flagcount("B", "disable bounds checking", &Debug['B'])
objabi.Flagcount("C", "disable printing of columns in error messages", &Debug['C']) // TODO(gri) remove eventually
flag.StringVar(&localimport, "D", "", "set relative `path` for local imports")
objabi.Flagcount("E", "debug symbol export", &Debug['E'])
objabi.Flagfn1("I", "add `directory` to import search path", addidir)
objabi.Flagcount("K", "debug missing line numbers", &Debug['K'])
objabi.Flagcount("L", "show full file names in error messages", &Debug['L'])
objabi.Flagcount("N", "disable optimizations", &Debug['N'])
objabi.Flagcount("S", "print assembly listing", &Debug['S'])
objabi.AddVersionFlag() // -V
objabi.Flagcount("W", "debug parse tree after type checking", &Debug['W'])
flag.StringVar(&asmhdr, "asmhdr", "", "write assembly header to `file`")
flag.StringVar(&buildid, "buildid", "", "record `id` as the build id in the export metadata")
flag.IntVar(&nBackendWorkers, "c", 1, "concurrency during compilation, 1 means no concurrency")
flag.BoolVar(&pure_go, "complete", false, "compiling complete package (no C or assembly)")
flag.StringVar(&debugstr, "d", "", "print debug information about items in `list`; try -d help")
flag.BoolVar(&flagDWARF, "dwarf", !Wasm, "generate DWARF symbols")
flag.BoolVar(&Ctxt.Flag_locationlists, "dwarflocationlists", true, "add location lists to DWARF in optimized mode")
flag.IntVar(&genDwarfInline, "gendwarfinl", 2, "generate DWARF inline info records")
objabi.Flagcount("e", "no limit on number of errors reported", &Debug['e'])
objabi.Flagcount("h", "halt on error", &Debug['h'])
objabi.Flagfn1("importmap", "add `definition` of the form source=actual to import map", addImportMap)
objabi.Flagfn1("importcfg", "read import configuration from `file`", readImportCfg)
flag.StringVar(&flag_installsuffix, "installsuffix", "", "set pkg directory `suffix`")
objabi.Flagcount("j", "debug runtime-initialized variables", &Debug['j'])
objabi.Flagcount("l", "disable inlining", &Debug['l'])
flag.StringVar(&flag_lang, "lang", "", "release to compile for")
flag.StringVar(&linkobj, "linkobj", "", "write linker-specific object to `file`")
objabi.Flagcount("live", "debug liveness analysis", &debuglive)
objabi.Flagcount("m", "print optimization decisions", &Debug['m'])
if sys.MSanSupported(objabi.GOOS, objabi.GOARCH) {
flag.BoolVar(&flag_msan, "msan", false, "build code compatible with C/C++ memory sanitizer")
}
flag.BoolVar(&nolocalimports, "nolocalimports", false, "reject local (relative) imports")
flag.StringVar(&outfile, "o", "", "write output to `file`")
flag.StringVar(&myimportpath, "p", "", "set expected package import `path`")
flag.BoolVar(&writearchive, "pack", false, "write to file.a instead of file.o")
objabi.Flagcount("r", "debug generated wrappers", &Debug['r'])
if sys.RaceDetectorSupported(objabi.GOOS, objabi.GOARCH) {
flag.BoolVar(&flag_race, "race", false, "enable race detector")
}
flag.StringVar(&spectre, "spectre", spectre, "enable spectre mitigations in `list` (all, index, ret)")
if enableTrace {
flag.BoolVar(&trace, "t", false, "trace type-checking")
}
flag.StringVar(&pathPrefix, "trimpath", "", "remove `prefix` from recorded source file paths")
flag.BoolVar(&Debug_vlog, "v", false, "increase debug verbosity")
objabi.Flagcount("w", "debug type checking", &Debug['w'])
flag.BoolVar(&use_writebarrier, "wb", true, "enable write barrier")
var flag_shared bool
var flag_dynlink bool
if supportsDynlink(thearch.LinkArch.Arch) {
flag.BoolVar(&flag_shared, "shared", false, "generate code that can be linked into a shared library")
flag.BoolVar(&flag_dynlink, "dynlink", false, "support references to Go symbols defined in other shared libraries")
flag.BoolVar(&Ctxt.Flag_linkshared, "linkshared", false, "generate code that will be linked against Go shared libraries")
}
flag.StringVar(&cpuprofile, "cpuprofile", "", "write cpu profile to `file`")
flag.StringVar(&memprofile, "memprofile", "", "write memory profile to `file`")
flag.Int64Var(&memprofilerate, "memprofilerate", 0, "set runtime.MemProfileRate to `rate`")
var goversion string
flag.StringVar(&goversion, "goversion", "", "required version of the runtime")
var symabisPath string
flag.StringVar(&symabisPath, "symabis", "", "read symbol ABIs from `file`")
flag.StringVar(&traceprofile, "traceprofile", "", "write an execution trace to `file`")
flag.StringVar(&blockprofile, "blockprofile", "", "write block profile to `file`")
flag.StringVar(&mutexprofile, "mutexprofile", "", "write mutex profile to `file`")
flag.StringVar(&benchfile, "bench", "", "append benchmark times to `file`")
flag.BoolVar(&smallFrames, "smallframes", false, "reduce the size limit for stack allocated objects")
flag.BoolVar(&Ctxt.UseBASEntries, "dwarfbasentries", Ctxt.UseBASEntries, "use base address selection entries in DWARF")
flag.BoolVar(&Ctxt.Flag_go115newobj, "go115newobj", true, "use new object file format")
flag.StringVar(&jsonLogOpt, "json", "", "version,destination for JSON compiler/optimizer logging")
objabi.Flagparse(usage)
for _, f := range strings.Split(spectre, ",") {
f = strings.TrimSpace(f)
switch f {
default:
log.Fatalf("unknown setting -spectre=%s", f)
case "":
// nothing
case "all":
spectreIndex = true
Ctxt.Retpoline = true
case "index":
spectreIndex = true
case "ret":
Ctxt.Retpoline = true
}
}
if spectreIndex {
switch objabi.GOARCH {
case "amd64":
// ok
default:
log.Fatalf("GOARCH=%s does not support -spectre=index", objabi.GOARCH)
}
}
// Record flags that affect the build result. (And don't
// record flags that don't, since that would cause spurious
// changes in the binary.)
recordFlags("B", "N", "l", "msan", "race", "shared", "dynlink", "dwarflocationlists", "dwarfbasentries", "smallframes", "spectre", "go115newobj")
if smallFrames {
maxStackVarSize = 128 * 1024
maxImplicitStackVarSize = 16 * 1024
}
Ctxt.Flag_shared = flag_dynlink || flag_shared
Ctxt.Flag_dynlink = flag_dynlink
Ctxt.Flag_optimize = Debug['N'] == 0
Ctxt.Debugasm = Debug['S']
Ctxt.Debugvlog = Debug_vlog
if flagDWARF {
Ctxt.DebugInfo = debuginfo
Ctxt.GenAbstractFunc = genAbstractFunc
Ctxt.DwFixups = obj.NewDwarfFixupTable(Ctxt)
} else {
// turn off inline generation if no dwarf at all
genDwarfInline = 0
Ctxt.Flag_locationlists = false
}
if flag.NArg() < 1 && debugstr != "help" && debugstr != "ssa/help" {
usage()
}
if goversion != "" && goversion != runtime.Version() {
fmt.Printf("compile: version %q does not match go tool version %q\n", runtime.Version(), goversion)
Exit(2)
}
checkLang()
if symabisPath != "" {
readSymABIs(symabisPath, myimportpath)
}
thearch.LinkArch.Init(Ctxt)
if outfile == "" {
p := flag.Arg(0)
if i := strings.LastIndex(p, "/"); i >= 0 {
p = p[i+1:]
}
if runtime.GOOS == "windows" {
if i := strings.LastIndex(p, `\`); i >= 0 {
p = p[i+1:]
}
}
if i := strings.LastIndex(p, "."); i >= 0 {
p = p[:i]
}
suffix := ".o"
if writearchive {
suffix = ".a"
}
outfile = p + suffix
}
startProfile()
if flag_race && flag_msan {
log.Fatal("cannot use both -race and -msan")
}
if flag_race || flag_msan {
// -race and -msan imply -d=checkptr for now.
Debug_checkptr = 1
}
if ispkgin(omit_pkgs) {
flag_race = false
flag_msan = false
}
if flag_race {
racepkg = types.NewPkg("runtime/race", "")
}
if flag_msan {
msanpkg = types.NewPkg("runtime/msan", "")
}
if flag_race || flag_msan {
instrumenting = true
}
if compiling_runtime && Debug['N'] != 0 {
log.Fatal("cannot disable optimizations while compiling runtime")
}
if nBackendWorkers < 1 {
log.Fatalf("-c must be at least 1, got %d", nBackendWorkers)
}
if nBackendWorkers > 1 && !concurrentBackendAllowed() {
log.Fatalf("cannot use concurrent backend compilation with provided flags; invoked as %v", os.Args)
}
if Ctxt.Flag_locationlists && len(Ctxt.Arch.DWARFRegisters) == 0 {
log.Fatalf("location lists requested but register mapping not available on %v", Ctxt.Arch.Name)
}
// parse -d argument
if debugstr != "" {
Split:
for _, name := range strings.Split(debugstr, ",") {
if name == "" {
continue
}
// display help about the -d option itself and quit
if name == "help" {
fmt.Print(debugHelpHeader)
maxLen := len("ssa/help")
for _, t := range debugtab {
if len(t.name) > maxLen {
maxLen = len(t.name)
}
}
for _, t := range debugtab {
fmt.Printf("\t%-*s\t%s\n", maxLen, t.name, t.help)
}
// ssa options have their own help
fmt.Printf("\t%-*s\t%s\n", maxLen, "ssa/help", "print help about SSA debugging")
fmt.Print(debugHelpFooter)
os.Exit(0)
}
val, valstring, haveInt := 1, "", true
if i := strings.IndexAny(name, "=:"); i >= 0 {
var err error
name, valstring = name[:i], name[i+1:]
val, err = strconv.Atoi(valstring)
if err != nil {
val, haveInt = 1, false
}
}
for _, t := range debugtab {
if t.name != name {
continue
}
switch vp := t.val.(type) {
case nil:
// Ignore
case *string:
*vp = valstring
case *int:
if !haveInt {
log.Fatalf("invalid debug value %v", name)
}
*vp = val
default:
panic("bad debugtab type")
}
continue Split
}
// special case for ssa for now
if strings.HasPrefix(name, "ssa/") {
// expect form ssa/phase/flag
// e.g. -d=ssa/generic_cse/time
// _ in phase name also matches space
phase := name[4:]
flag := "debug" // default flag is debug
if i := strings.Index(phase, "/"); i >= 0 {
flag = phase[i+1:]
phase = phase[:i]
}
err := ssa.PhaseOption(phase, flag, val, valstring)
if err != "" {
log.Fatalf(err)
}
continue Split
}
log.Fatalf("unknown debug key -d %s\n", name)
}
}
if compiling_runtime {
// Runtime can't use -d=checkptr, at least not yet.
Debug_checkptr = 0
// Fuzzing the runtime isn't interesting either.
Debug_libfuzzer = 0
}
// set via a -d flag
Ctxt.Debugpcln = Debug_pctab
if flagDWARF {
dwarf.EnableLogging(Debug_gendwarfinl != 0)
}
if Debug_softfloat != 0 {
thearch.SoftFloat = true
}
// enable inlining. for now:
// default: inlining on. (debug['l'] == 1)
// -l: inlining off (debug['l'] == 0)
// -l=2, -l=3: inlining on again, with extra debugging (debug['l'] > 1)
if Debug['l'] <= 1 {
Debug['l'] = 1 - Debug['l']
}
if jsonLogOpt != "" { // parse version,destination from json logging optimization.
logopt.LogJsonOption(jsonLogOpt)
}
ssaDump = os.Getenv("GOSSAFUNC")
if ssaDump != "" {
if strings.HasSuffix(ssaDump, "+") {
ssaDump = ssaDump[:len(ssaDump)-1]
ssaDumpStdout = true
}
spl := strings.Split(ssaDump, ":")
if len(spl) > 1 {
ssaDump = spl[0]
ssaDumpCFG = spl[1]
}
}
trackScopes = flagDWARF
Widthptr = thearch.LinkArch.PtrSize
Widthreg = thearch.LinkArch.RegSize
// initialize types package
// (we need to do this to break dependencies that otherwise
// would lead to import cycles)
types.Widthptr = Widthptr
types.Dowidth = dowidth
types.Fatalf = Fatalf
types.Sconv = func(s *types.Sym, flag, mode int) string {
return sconv(s, FmtFlag(flag), fmtMode(mode))
}
types.Tconv = func(t *types.Type, flag, mode int) string {
return tconv(t, FmtFlag(flag), fmtMode(mode))
}
types.FormatSym = func(sym *types.Sym, s fmt.State, verb rune, mode int) {
symFormat(sym, s, verb, fmtMode(mode))
}
types.FormatType = func(t *types.Type, s fmt.State, verb rune, mode int) {
typeFormat(t, s, verb, fmtMode(mode))
}
types.TypeLinkSym = func(t *types.Type) *obj.LSym {
return typenamesym(t).Linksym()
}
types.FmtLeft = int(FmtLeft)
types.FmtUnsigned = int(FmtUnsigned)
types.FErr = int(FErr)
types.Ctxt = Ctxt
initUniverse()
dclcontext = PEXTERN
nerrors = 0
autogeneratedPos = makePos(src.NewFileBase("<autogenerated>", "<autogenerated>"), 1, 0)
timings.Start("fe", "loadsys")
loadsys()
timings.Start("fe", "parse")
lines := parseFiles(flag.Args())
timings.Stop()
timings.AddEvent(int64(lines), "lines")
finishUniverse()
recordPackageName()
typecheckok = true
// Process top-level declarations in phases.
// Phase 1: const, type, and names and types of funcs.
// This will gather all the information about types
// and methods but doesn't depend on any of it.
//
// We also defer type alias declarations until phase 2
// to avoid cycles like #18640.
// TODO(gri) Remove this again once we have a fix for #25838.
// Don't use range--typecheck can add closures to xtop.
timings.Start("fe", "typecheck", "top1")
for i := 0; i < len(xtop); i++ {
n := xtop[i]
if op := n.Op; op != ODCL && op != OAS && op != OAS2 && (op != ODCLTYPE || !n.Left.Name.Param.Alias) {
xtop[i] = typecheck(n, ctxStmt)
}
}
// Phase 2: Variable assignments.
// To check interface assignments, depends on phase 1.
// Don't use range--typecheck can add closures to xtop.
timings.Start("fe", "typecheck", "top2")
for i := 0; i < len(xtop); i++ {
n := xtop[i]
if op := n.Op; op == ODCL || op == OAS || op == OAS2 || op == ODCLTYPE && n.Left.Name.Param.Alias {
xtop[i] = typecheck(n, ctxStmt)
}
}
// Phase 3: Type check function bodies.
// Don't use range--typecheck can add closures to xtop.
timings.Start("fe", "typecheck", "func")
var fcount int64
for i := 0; i < len(xtop); i++ {
n := xtop[i]
if op := n.Op; op == ODCLFUNC || op == OCLOSURE {
Curfn = n
decldepth = 1
saveerrors()
typecheckslice(Curfn.Nbody.Slice(), ctxStmt)
checkreturn(Curfn)
if nerrors != 0 {
Curfn.Nbody.Set(nil) // type errors; do not compile
}
// Now that we've checked whether n terminates,
// we can eliminate some obviously dead code.
deadcode(Curfn)
fcount++
}
}
// With all types checked, it's now safe to verify map keys. One single
// check past phase 9 isn't sufficient, as we may exit with other errors
// before then, thus skipping map key errors.
checkMapKeys()
timings.AddEvent(fcount, "funcs")
if nsavederrors+nerrors != 0 {
errorexit()
}
// Phase 4: Decide how to capture closed variables.
// This needs to run before escape analysis,
// because variables captured by value do not escape.
timings.Start("fe", "capturevars")
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
capturevars(n)
}
}
capturevarscomplete = true
Curfn = nil
if nsavederrors+nerrors != 0 {
errorexit()
}
// Phase 5: Inlining
timings.Start("fe", "inlining")
if Debug_typecheckinl != 0 {
// Typecheck imported function bodies if debug['l'] > 1,
// otherwise lazily when used or re-exported.
for _, n := range importlist {
if n.Func.Inl != nil {
saveerrors()
typecheckinl(n)
}
}
if nsavederrors+nerrors != 0 {
errorexit()
}
}
if Debug['l'] != 0 {
// Find functions that can be inlined and clone them before walk expands them.
visitBottomUp(xtop, func(list []*Node, recursive bool) {
numfns := numNonClosures(list)
for _, n := range list {
if !recursive || numfns > 1 {
// We allow inlining if there is no
// recursion, or the recursion cycle is
// across more than one function.
caninl(n)
} else {
if Debug['m'] > 1 {
fmt.Printf("%v: cannot inline %v: recursive\n", n.Line(), n.Func.Nname)
}
}
inlcalls(n)
}
})
}
// Phase 6: Escape analysis.
// Required for moving heap allocations onto stack,
// which in turn is required by the closure implementation,
// which stores the addresses of stack variables into the closure.
// If the closure does not escape, it needs to be on the stack
// or else the stack copier will not update it.
// Large values are also moved off stack in escape analysis;
// because large values may contain pointers, it must happen early.
timings.Start("fe", "escapes")
escapes(xtop)
// Collect information for go:nowritebarrierrec
// checking. This must happen before transformclosure.
// We'll do the final check after write barriers are
// inserted.
if compiling_runtime {
nowritebarrierrecCheck = newNowritebarrierrecChecker()
}
// Phase 7: Transform closure bodies to properly reference captured variables.
// This needs to happen before walk, because closures must be transformed
// before walk reaches a call of a closure.
timings.Start("fe", "xclosures")
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
transformclosure(n)
}
}
// Prepare for SSA compilation.
// This must be before peekitabs, because peekitabs
// can trigger function compilation.
initssaconfig()
// Just before compilation, compile itabs found on
// the right side of OCONVIFACE so that methods
// can be de-virtualized during compilation.
Curfn = nil
peekitabs()
// Phase 8: Compile top level functions.
// Don't use range--walk can add functions to xtop.
timings.Start("be", "compilefuncs")
fcount = 0
for i := 0; i < len(xtop); i++ {
n := xtop[i]
if n.Op == ODCLFUNC {
funccompile(n)
fcount++
}
}
timings.AddEvent(fcount, "funcs")
if nsavederrors+nerrors == 0 {
fninit(xtop)
}
compileFunctions()
if nowritebarrierrecCheck != nil {
// Write barriers are now known. Check the
// call graph.
nowritebarrierrecCheck.check()
nowritebarrierrecCheck = nil
}
// Finalize DWARF inline routine DIEs, then explicitly turn off
// DWARF inlining gen so as to avoid problems with generated
// method wrappers.
if Ctxt.DwFixups != nil {
Ctxt.DwFixups.Finalize(myimportpath, Debug_gendwarfinl != 0)
Ctxt.DwFixups = nil
genDwarfInline = 0
}
// Phase 9: Check external declarations.
timings.Start("be", "externaldcls")
for i, n := range externdcl {
if n.Op == ONAME {
externdcl[i] = typecheck(externdcl[i], ctxExpr)
}
}
// Check the map keys again, since we typechecked the external
// declarations.
checkMapKeys()
if nerrors+nsavederrors != 0 {
errorexit()
}
// Write object data to disk.
timings.Start("be", "dumpobj")
dumpdata()
Ctxt.NumberSyms(false)
dumpobj()
if asmhdr != "" {
dumpasmhdr()
}
// Check whether any of the functions we have compiled have gigantic stack frames.
sort.Slice(largeStackFrames, func(i, j int) bool {
return largeStackFrames[i].pos.Before(largeStackFrames[j].pos)
})
for _, large := range largeStackFrames {
if large.callee != 0 {
yyerrorl(large.pos, "stack frame too large (>1GB): %d MB locals + %d MB args + %d MB callee", large.locals>>20, large.args>>20, large.callee>>20)
} else {
yyerrorl(large.pos, "stack frame too large (>1GB): %d MB locals + %d MB args", large.locals>>20, large.args>>20)
}
}
if len(compilequeue) != 0 {
Fatalf("%d uncompiled functions", len(compilequeue))
}
logopt.FlushLoggedOpts(Ctxt, myimportpath)
if nerrors+nsavederrors != 0 {
errorexit()
}
flusherrors()
timings.Stop()
if benchfile != "" {
if err := writebench(benchfile); err != nil {
log.Fatalf("cannot write benchmark data: %v", err)
}
}
}
// numNonClosures returns the number of functions in list which are not closures.
func numNonClosures(list []*Node) int {
count := 0
for _, n := range list {
if n.Func.Closure == nil {
count++
}
}
return count
}
func writebench(filename string) error {
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return err
}
var buf bytes.Buffer
fmt.Fprintln(&buf, "commit:", objabi.Version)
fmt.Fprintln(&buf, "goos:", runtime.GOOS)
fmt.Fprintln(&buf, "goarch:", runtime.GOARCH)
timings.Write(&buf, "BenchmarkCompile:"+myimportpath+":")
n, err := f.Write(buf.Bytes())
if err != nil {
return err
}
if n != buf.Len() {
panic("bad writer")
}
return f.Close()
}
var (
importMap = map[string]string{}
packageFile map[string]string // nil means not in use
)
func addImportMap(s string) {
if strings.Count(s, "=") != 1 {
log.Fatal("-importmap argument must be of the form source=actual")
}
i := strings.Index(s, "=")
source, actual := s[:i], s[i+1:]
if source == "" || actual == "" {
log.Fatal("-importmap argument must be of the form source=actual; source and actual must be non-empty")
}
importMap[source] = actual
}
func readImportCfg(file string) {
packageFile = map[string]string{}
data, err := ioutil.ReadFile(file)
if err != nil {
log.Fatalf("-importcfg: %v", err)
}
for lineNum, line := range strings.Split(string(data), "\n") {
lineNum++ // 1-based
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
continue
}
var verb, args string
if i := strings.Index(line, " "); i < 0 {
verb = line
} else {
verb, args = line[:i], strings.TrimSpace(line[i+1:])
}
var before, after string
if i := strings.Index(args, "="); i >= 0 {
before, after = args[:i], args[i+1:]
}
switch verb {
default:
log.Fatalf("%s:%d: unknown directive %q", file, lineNum, verb)
case "importmap":
if before == "" || after == "" {
log.Fatalf(`%s:%d: invalid importmap: syntax is "importmap old=new"`, file, lineNum)
}
importMap[before] = after
case "packagefile":
if before == "" || after == "" {
log.Fatalf(`%s:%d: invalid packagefile: syntax is "packagefile path=filename"`, file, lineNum)
}
packageFile[before] = after
}
}
}
// symabiDefs and symabiRefs record the defined and referenced ABIs of
// symbols required by non-Go code. These are keyed by link symbol
// name, where the local package prefix is always `"".`
var symabiDefs, symabiRefs map[string]obj.ABI
// readSymABIs reads a symabis file that specifies definitions and
// references of text symbols by ABI.
//
// The symabis format is a set of lines, where each line is a sequence
// of whitespace-separated fields. The first field is a verb and is
// either "def" for defining a symbol ABI or "ref" for referencing a
// symbol using an ABI. For both "def" and "ref", the second field is
// the symbol name and the third field is the ABI name, as one of the
// named cmd/internal/obj.ABI constants.
func readSymABIs(file, myimportpath string) {
data, err := ioutil.ReadFile(file)
if err != nil {
log.Fatalf("-symabis: %v", err)
}
symabiDefs = make(map[string]obj.ABI)
symabiRefs = make(map[string]obj.ABI)
localPrefix := ""
if myimportpath != "" {
// Symbols in this package may be written either as
// "".X or with the package's import path already in
// the symbol.
localPrefix = objabi.PathToPrefix(myimportpath) + "."
}
for lineNum, line := range strings.Split(string(data), "\n") {
lineNum++ // 1-based
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
continue
}
parts := strings.Fields(line)
switch parts[0] {
case "def", "ref":
// Parse line.
if len(parts) != 3 {
log.Fatalf(`%s:%d: invalid symabi: syntax is "%s sym abi"`, file, lineNum, parts[0])
}
sym, abi := parts[1], parts[2]
if abi != "ABI0" { // Only supported external ABI right now
log.Fatalf(`%s:%d: invalid symabi: unknown abi "%s"`, file, lineNum, abi)
}
// If the symbol is already prefixed with
// myimportpath, rewrite it to start with ""
// so it matches the compiler's internal
// symbol names.
if localPrefix != "" && strings.HasPrefix(sym, localPrefix) {
sym = `"".` + sym[len(localPrefix):]
}
// Record for later.
if parts[0] == "def" {
symabiDefs[sym] = obj.ABI0
} else {
symabiRefs[sym] = obj.ABI0
}
default:
log.Fatalf(`%s:%d: invalid symabi type "%s"`, file, lineNum, parts[0])
}
}
}
func saveerrors() {
nsavederrors += nerrors
nerrors = 0
}
func arsize(b *bufio.Reader, name string) int {
var buf [ArhdrSize]byte
if _, err := io.ReadFull(b, buf[:]); err != nil {