1// Copyright 2009 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package base 6 7import ( 8 "cmd/internal/cov/covcmd" 9 "cmd/internal/telemetry/counter" 10 "encoding/json" 11 "flag" 12 "fmt" 13 "internal/buildcfg" 14 "internal/platform" 15 "log" 16 "os" 17 "reflect" 18 "runtime" 19 "strings" 20 21 "cmd/internal/obj" 22 "cmd/internal/objabi" 23 "cmd/internal/sys" 24) 25 26func usage() { 27 fmt.Fprintf(os.Stderr, "usage: compile [options] file.go...\n") 28 objabi.Flagprint(os.Stderr) 29 Exit(2) 30} 31 32// Flag holds the parsed command-line flags. 33// See ParseFlag for non-zero defaults. 34var Flag CmdFlags 35 36// A CountFlag is a counting integer flag. 37// It accepts -name=value to set the value directly, 38// but it also accepts -name with no =value to increment the count. 39type CountFlag int 40 41// CmdFlags defines the command-line flags (see var Flag). 42// Each struct field is a different flag, by default named for the lower-case of the field name. 43// If the flag name is a single letter, the default flag name is left upper-case. 44// If the flag name is "Lower" followed by a single letter, the default flag name is the lower-case of the last letter. 45// 46// If this default flag name can't be made right, the `flag` struct tag can be used to replace it, 47// but this should be done only in exceptional circumstances: it helps everyone if the flag name 48// is obvious from the field name when the flag is used elsewhere in the compiler sources. 49// The `flag:"-"` struct tag makes a field invisible to the flag logic and should also be used sparingly. 50// 51// Each field must have a `help` struct tag giving the flag help message. 52// 53// The allowed field types are bool, int, string, pointers to those (for values stored elsewhere), 54// CountFlag (for a counting flag), and func(string) (for a flag that uses special code for parsing). 55type CmdFlags struct { 56 // Single letters 57 B CountFlag "help:\"disable bounds checking\"" 58 C CountFlag "help:\"disable printing of columns in error messages\"" 59 D string "help:\"set relative `path` for local imports\"" 60 E CountFlag "help:\"debug symbol export\"" 61 I func(string) "help:\"add `directory` to import search path\"" 62 K CountFlag "help:\"debug missing line numbers\"" 63 L CountFlag "help:\"also show actual source file names in error messages for positions affected by //line directives\"" 64 N CountFlag "help:\"disable optimizations\"" 65 S CountFlag "help:\"print assembly listing\"" 66 // V is added by objabi.AddVersionFlag 67 W CountFlag "help:\"debug parse tree after type checking\"" 68 69 LowerC int "help:\"concurrency during compilation (1 means no concurrency)\"" 70 LowerD flag.Value "help:\"enable debugging settings; try -d help\"" 71 LowerE CountFlag "help:\"no limit on number of errors reported\"" 72 LowerH CountFlag "help:\"halt on error\"" 73 LowerJ CountFlag "help:\"debug runtime-initialized variables\"" 74 LowerL CountFlag "help:\"disable inlining\"" 75 LowerM CountFlag "help:\"print optimization decisions\"" 76 LowerO string "help:\"write output to `file`\"" 77 LowerP *string "help:\"set expected package import `path`\"" // &Ctxt.Pkgpath, set below 78 LowerR CountFlag "help:\"debug generated wrappers\"" 79 LowerT bool "help:\"enable tracing for debugging the compiler\"" 80 LowerW CountFlag "help:\"debug type checking\"" 81 LowerV *bool "help:\"increase debug verbosity\"" 82 83 // Special characters 84 Percent CountFlag "flag:\"%\" help:\"debug non-static initializers\"" 85 CompilingRuntime bool "flag:\"+\" help:\"compiling runtime\"" 86 87 // Longer names 88 AsmHdr string "help:\"write assembly header to `file`\"" 89 ASan bool "help:\"build code compatible with C/C++ address sanitizer\"" 90 Bench string "help:\"append benchmark times to `file`\"" 91 BlockProfile string "help:\"write block profile to `file`\"" 92 BuildID string "help:\"record `id` as the build id in the export metadata\"" 93 CPUProfile string "help:\"write cpu profile to `file`\"" 94 Complete bool "help:\"compiling complete package (no C or assembly)\"" 95 ClobberDead bool "help:\"clobber dead stack slots (for debugging)\"" 96 ClobberDeadReg bool "help:\"clobber dead registers (for debugging)\"" 97 Dwarf bool "help:\"generate DWARF symbols\"" 98 DwarfBASEntries *bool "help:\"use base address selection entries in DWARF\"" // &Ctxt.UseBASEntries, set below 99 DwarfLocationLists *bool "help:\"add location lists to DWARF in optimized mode\"" // &Ctxt.Flag_locationlists, set below 100 Dynlink *bool "help:\"support references to Go symbols defined in other shared libraries\"" // &Ctxt.Flag_dynlink, set below 101 EmbedCfg func(string) "help:\"read go:embed configuration from `file`\"" 102 Env func(string) "help:\"add `definition` of the form key=value to environment\"" 103 GenDwarfInl int "help:\"generate DWARF inline info records\"" // 0=disabled, 1=funcs, 2=funcs+formals/locals 104 GoVersion string "help:\"required version of the runtime\"" 105 ImportCfg func(string) "help:\"read import configuration from `file`\"" 106 InstallSuffix string "help:\"set pkg directory `suffix`\"" 107 JSON string "help:\"version,file for JSON compiler/optimizer detail output\"" 108 Lang string "help:\"Go language version source code expects\"" 109 LinkObj string "help:\"write linker-specific object to `file`\"" 110 LinkShared *bool "help:\"generate code that will be linked against Go shared libraries\"" // &Ctxt.Flag_linkshared, set below 111 Live CountFlag "help:\"debug liveness analysis\"" 112 MSan bool "help:\"build code compatible with C/C++ memory sanitizer\"" 113 MemProfile string "help:\"write memory profile to `file`\"" 114 MemProfileRate int "help:\"set runtime.MemProfileRate to `rate`\"" 115 MutexProfile string "help:\"write mutex profile to `file`\"" 116 NoLocalImports bool "help:\"reject local (relative) imports\"" 117 CoverageCfg func(string) "help:\"read coverage configuration from `file`\"" 118 Pack bool "help:\"write to file.a instead of file.o\"" 119 Race bool "help:\"enable race detector\"" 120 Shared *bool "help:\"generate code that can be linked into a shared library\"" // &Ctxt.Flag_shared, set below 121 SmallFrames bool "help:\"reduce the size limit for stack allocated objects\"" // small stacks, to diagnose GC latency; see golang.org/issue/27732 122 Spectre string "help:\"enable spectre mitigations in `list` (all, index, ret)\"" 123 Std bool "help:\"compiling standard library\"" 124 SymABIs string "help:\"read symbol ABIs from `file`\"" 125 TraceProfile string "help:\"write an execution trace to `file`\"" 126 TrimPath string "help:\"remove `prefix` from recorded source file paths\"" 127 WB bool "help:\"enable write barrier\"" // TODO: remove 128 PgoProfile string "help:\"read profile or pre-process profile from `file`\"" 129 ErrorURL bool "help:\"print explanatory URL with error message if applicable\"" 130 131 // Configuration derived from flags; not a flag itself. 132 Cfg struct { 133 Embed struct { // set by -embedcfg 134 Patterns map[string][]string 135 Files map[string]string 136 } 137 ImportDirs []string // appended to by -I 138 ImportMap map[string]string // set by -importcfg 139 PackageFile map[string]string // set by -importcfg; nil means not in use 140 CoverageInfo *covcmd.CoverFixupConfig // set by -coveragecfg 141 SpectreIndex bool // set by -spectre=index or -spectre=all 142 // Whether we are adding any sort of code instrumentation, such as 143 // when the race detector is enabled. 144 Instrumenting bool 145 } 146} 147 148func addEnv(s string) { 149 i := strings.Index(s, "=") 150 if i < 0 { 151 log.Fatal("-env argument must be of the form key=value") 152 } 153 os.Setenv(s[:i], s[i+1:]) 154} 155 156// ParseFlags parses the command-line flags into Flag. 157func ParseFlags() { 158 Flag.I = addImportDir 159 160 Flag.LowerC = runtime.GOMAXPROCS(0) 161 Flag.LowerD = objabi.NewDebugFlag(&Debug, DebugSSA) 162 Flag.LowerP = &Ctxt.Pkgpath 163 Flag.LowerV = &Ctxt.Debugvlog 164 165 Flag.Dwarf = buildcfg.GOARCH != "wasm" 166 Flag.DwarfBASEntries = &Ctxt.UseBASEntries 167 Flag.DwarfLocationLists = &Ctxt.Flag_locationlists 168 *Flag.DwarfLocationLists = true 169 Flag.Dynlink = &Ctxt.Flag_dynlink 170 Flag.EmbedCfg = readEmbedCfg 171 Flag.Env = addEnv 172 Flag.GenDwarfInl = 2 173 Flag.ImportCfg = readImportCfg 174 Flag.CoverageCfg = readCoverageCfg 175 Flag.LinkShared = &Ctxt.Flag_linkshared 176 Flag.Shared = &Ctxt.Flag_shared 177 Flag.WB = true 178 179 Debug.ConcurrentOk = true 180 Debug.MaxShapeLen = 500 181 Debug.AlignHot = 1 182 Debug.InlFuncsWithClosures = 1 183 Debug.InlStaticInit = 1 184 Debug.PGOInline = 1 185 Debug.PGODevirtualize = 2 186 Debug.SyncFrames = -1 // disable sync markers by default 187 Debug.ZeroCopy = 1 188 Debug.RangeFuncCheck = 1 189 Debug.MergeLocals = 1 190 191 Debug.Checkptr = -1 // so we can tell whether it is set explicitly 192 193 Flag.Cfg.ImportMap = make(map[string]string) 194 195 objabi.AddVersionFlag() // -V 196 registerFlags() 197 objabi.Flagparse(usage) 198 counter.CountFlags("compile/flag:", *flag.CommandLine) 199 200 if gcd := os.Getenv("GOCOMPILEDEBUG"); gcd != "" { 201 // This will only override the flags set in gcd; 202 // any others set on the command line remain set. 203 Flag.LowerD.Set(gcd) 204 } 205 206 if Debug.Gossahash != "" { 207 hashDebug = NewHashDebug("gossahash", Debug.Gossahash, nil) 208 } 209 210 // Compute whether we're compiling the runtime from the package path. Test 211 // code can also use the flag to set this explicitly. 212 if Flag.Std && objabi.LookupPkgSpecial(Ctxt.Pkgpath).Runtime { 213 Flag.CompilingRuntime = true 214 } 215 216 Ctxt.Std = Flag.Std 217 218 // Three inputs govern loop iteration variable rewriting, hash, experiment, flag. 219 // The loop variable rewriting is: 220 // IF non-empty hash, then hash determines behavior (function+line match) (*) 221 // ELSE IF experiment and flag==0, then experiment (set flag=1) 222 // ELSE flag (note that build sets flag per-package), with behaviors: 223 // -1 => no change to behavior. 224 // 0 => no change to behavior (unless non-empty hash, see above) 225 // 1 => apply change to likely-iteration-variable-escaping loops 226 // 2 => apply change, log results 227 // 11 => apply change EVERYWHERE, do not log results (for debugging/benchmarking) 228 // 12 => apply change EVERYWHERE, log results (for debugging/benchmarking) 229 // 230 // The expected uses of the these inputs are, in believed most-likely to least likely: 231 // GOEXPERIMENT=loopvar -- apply change to entire application 232 // -gcflags=some_package=-d=loopvar=1 -- apply change to some_package (**) 233 // -gcflags=some_package=-d=loopvar=2 -- apply change to some_package, log it 234 // GOEXPERIMENT=loopvar -gcflags=some_package=-d=loopvar=-1 -- apply change to all but one package 235 // GOCOMPILEDEBUG=loopvarhash=... -- search for failure cause 236 // 237 // (*) For debugging purposes, providing loopvar flag >= 11 will expand the hash-eligible set of loops to all. 238 // (**) Loop semantics, changed or not, follow code from a package when it is inlined; that is, the behavior 239 // of an application compiled with partially modified loop semantics does not depend on inlining. 240 241 if Debug.LoopVarHash != "" { 242 // This first little bit controls the inputs for debug-hash-matching. 243 mostInlineOnly := true 244 if strings.HasPrefix(Debug.LoopVarHash, "IL") { 245 // When hash-searching on a position that is an inline site, default is to use the 246 // most-inlined position only. This makes the hash faster, plus there's no point 247 // reporting a problem with all the inlining; there's only one copy of the source. 248 // However, if for some reason you wanted it per-site, you can get this. (The default 249 // hash-search behavior for compiler debugging is at an inline site.) 250 Debug.LoopVarHash = Debug.LoopVarHash[2:] 251 mostInlineOnly = false 252 } 253 // end of testing trickiness 254 LoopVarHash = NewHashDebug("loopvarhash", Debug.LoopVarHash, nil) 255 if Debug.LoopVar < 11 { // >= 11 means all loops are rewrite-eligible 256 Debug.LoopVar = 1 // 1 means those loops that syntactically escape their dcl vars are eligible. 257 } 258 LoopVarHash.SetInlineSuffixOnly(mostInlineOnly) 259 } else if buildcfg.Experiment.LoopVar && Debug.LoopVar == 0 { 260 Debug.LoopVar = 1 261 } 262 263 if Debug.Fmahash != "" { 264 FmaHash = NewHashDebug("fmahash", Debug.Fmahash, nil) 265 } 266 if Debug.PGOHash != "" { 267 PGOHash = NewHashDebug("pgohash", Debug.PGOHash, nil) 268 } 269 if Debug.MergeLocalsHash != "" { 270 MergeLocalsHash = NewHashDebug("mergelocals", Debug.MergeLocalsHash, nil) 271 } 272 273 if Flag.MSan && !platform.MSanSupported(buildcfg.GOOS, buildcfg.GOARCH) { 274 log.Fatalf("%s/%s does not support -msan", buildcfg.GOOS, buildcfg.GOARCH) 275 } 276 if Flag.ASan && !platform.ASanSupported(buildcfg.GOOS, buildcfg.GOARCH) { 277 log.Fatalf("%s/%s does not support -asan", buildcfg.GOOS, buildcfg.GOARCH) 278 } 279 if Flag.Race && !platform.RaceDetectorSupported(buildcfg.GOOS, buildcfg.GOARCH) { 280 log.Fatalf("%s/%s does not support -race", buildcfg.GOOS, buildcfg.GOARCH) 281 } 282 if (*Flag.Shared || *Flag.Dynlink || *Flag.LinkShared) && !Ctxt.Arch.InFamily(sys.AMD64, sys.ARM, sys.ARM64, sys.I386, sys.Loong64, sys.MIPS64, sys.PPC64, sys.RISCV64, sys.S390X) { 283 log.Fatalf("%s/%s does not support -shared", buildcfg.GOOS, buildcfg.GOARCH) 284 } 285 parseSpectre(Flag.Spectre) // left as string for RecordFlags 286 287 Ctxt.Flag_shared = Ctxt.Flag_dynlink || Ctxt.Flag_shared 288 Ctxt.Flag_optimize = Flag.N == 0 289 Ctxt.Debugasm = int(Flag.S) 290 Ctxt.Flag_maymorestack = Debug.MayMoreStack 291 Ctxt.Flag_noRefName = Debug.NoRefName != 0 292 293 if flag.NArg() < 1 { 294 usage() 295 } 296 297 if Flag.GoVersion != "" && Flag.GoVersion != runtime.Version() { 298 fmt.Printf("compile: version %q does not match go tool version %q\n", runtime.Version(), Flag.GoVersion) 299 Exit(2) 300 } 301 302 if *Flag.LowerP == "" { 303 *Flag.LowerP = obj.UnlinkablePkg 304 } 305 306 if Flag.LowerO == "" { 307 p := flag.Arg(0) 308 if i := strings.LastIndex(p, "/"); i >= 0 { 309 p = p[i+1:] 310 } 311 if runtime.GOOS == "windows" { 312 if i := strings.LastIndex(p, `\`); i >= 0 { 313 p = p[i+1:] 314 } 315 } 316 if i := strings.LastIndex(p, "."); i >= 0 { 317 p = p[:i] 318 } 319 suffix := ".o" 320 if Flag.Pack { 321 suffix = ".a" 322 } 323 Flag.LowerO = p + suffix 324 } 325 switch { 326 case Flag.Race && Flag.MSan: 327 log.Fatal("cannot use both -race and -msan") 328 case Flag.Race && Flag.ASan: 329 log.Fatal("cannot use both -race and -asan") 330 case Flag.MSan && Flag.ASan: 331 log.Fatal("cannot use both -msan and -asan") 332 } 333 if Flag.Race || Flag.MSan || Flag.ASan { 334 // -race, -msan and -asan imply -d=checkptr for now. 335 if Debug.Checkptr == -1 { // if not set explicitly 336 Debug.Checkptr = 1 337 } 338 } 339 340 if Flag.LowerC < 1 { 341 log.Fatalf("-c must be at least 1, got %d", Flag.LowerC) 342 } 343 if !concurrentBackendAllowed() { 344 Flag.LowerC = 1 345 } 346 347 if Flag.CompilingRuntime { 348 // It is not possible to build the runtime with no optimizations, 349 // because the compiler cannot eliminate enough write barriers. 350 Flag.N = 0 351 Ctxt.Flag_optimize = true 352 353 // Runtime can't use -d=checkptr, at least not yet. 354 Debug.Checkptr = 0 355 356 // Fuzzing the runtime isn't interesting either. 357 Debug.Libfuzzer = 0 358 } 359 360 if Debug.Checkptr == -1 { // if not set explicitly 361 Debug.Checkptr = 0 362 } 363 364 // set via a -d flag 365 Ctxt.Debugpcln = Debug.PCTab 366 367 // https://golang.org/issue/67502 368 if buildcfg.GOOS == "plan9" && buildcfg.GOARCH == "386" { 369 Debug.AlignHot = 0 370 } 371} 372 373// registerFlags adds flag registrations for all the fields in Flag. 374// See the comment on type CmdFlags for the rules. 375func registerFlags() { 376 var ( 377 boolType = reflect.TypeOf(bool(false)) 378 intType = reflect.TypeOf(int(0)) 379 stringType = reflect.TypeOf(string("")) 380 ptrBoolType = reflect.TypeOf(new(bool)) 381 ptrIntType = reflect.TypeOf(new(int)) 382 ptrStringType = reflect.TypeOf(new(string)) 383 countType = reflect.TypeOf(CountFlag(0)) 384 funcType = reflect.TypeOf((func(string))(nil)) 385 ) 386 387 v := reflect.ValueOf(&Flag).Elem() 388 t := v.Type() 389 for i := 0; i < t.NumField(); i++ { 390 f := t.Field(i) 391 if f.Name == "Cfg" { 392 continue 393 } 394 395 var name string 396 if len(f.Name) == 1 { 397 name = f.Name 398 } else if len(f.Name) == 6 && f.Name[:5] == "Lower" && 'A' <= f.Name[5] && f.Name[5] <= 'Z' { 399 name = string(rune(f.Name[5] + 'a' - 'A')) 400 } else { 401 name = strings.ToLower(f.Name) 402 } 403 if tag := f.Tag.Get("flag"); tag != "" { 404 name = tag 405 } 406 407 help := f.Tag.Get("help") 408 if help == "" { 409 panic(fmt.Sprintf("base.Flag.%s is missing help text", f.Name)) 410 } 411 412 if k := f.Type.Kind(); (k == reflect.Ptr || k == reflect.Func) && v.Field(i).IsNil() { 413 panic(fmt.Sprintf("base.Flag.%s is uninitialized %v", f.Name, f.Type)) 414 } 415 416 switch f.Type { 417 case boolType: 418 p := v.Field(i).Addr().Interface().(*bool) 419 flag.BoolVar(p, name, *p, help) 420 case intType: 421 p := v.Field(i).Addr().Interface().(*int) 422 flag.IntVar(p, name, *p, help) 423 case stringType: 424 p := v.Field(i).Addr().Interface().(*string) 425 flag.StringVar(p, name, *p, help) 426 case ptrBoolType: 427 p := v.Field(i).Interface().(*bool) 428 flag.BoolVar(p, name, *p, help) 429 case ptrIntType: 430 p := v.Field(i).Interface().(*int) 431 flag.IntVar(p, name, *p, help) 432 case ptrStringType: 433 p := v.Field(i).Interface().(*string) 434 flag.StringVar(p, name, *p, help) 435 case countType: 436 p := (*int)(v.Field(i).Addr().Interface().(*CountFlag)) 437 objabi.Flagcount(name, help, p) 438 case funcType: 439 f := v.Field(i).Interface().(func(string)) 440 objabi.Flagfn1(name, help, f) 441 default: 442 if val, ok := v.Field(i).Interface().(flag.Value); ok { 443 flag.Var(val, name, help) 444 } else { 445 panic(fmt.Sprintf("base.Flag.%s has unexpected type %s", f.Name, f.Type)) 446 } 447 } 448 } 449} 450 451// concurrentFlagOk reports whether the current compiler flags 452// are compatible with concurrent compilation. 453func concurrentFlagOk() bool { 454 // TODO(rsc): Many of these are fine. Remove them. 455 return Flag.Percent == 0 && 456 Flag.E == 0 && 457 Flag.K == 0 && 458 Flag.L == 0 && 459 Flag.LowerH == 0 && 460 Flag.LowerJ == 0 && 461 Flag.LowerM == 0 && 462 Flag.LowerR == 0 463} 464 465func concurrentBackendAllowed() bool { 466 if !concurrentFlagOk() { 467 return false 468 } 469 470 // Debug.S by itself is ok, because all printing occurs 471 // while writing the object file, and that is non-concurrent. 472 // Adding Debug_vlog, however, causes Debug.S to also print 473 // while flushing the plist, which happens concurrently. 474 if Ctxt.Debugvlog || !Debug.ConcurrentOk || Flag.Live > 0 { 475 return false 476 } 477 // TODO: Test and delete this condition. 478 if buildcfg.Experiment.FieldTrack { 479 return false 480 } 481 // TODO: fix races and enable the following flags 482 if Ctxt.Flag_dynlink || Flag.Race { 483 return false 484 } 485 return true 486} 487 488func addImportDir(dir string) { 489 if dir != "" { 490 Flag.Cfg.ImportDirs = append(Flag.Cfg.ImportDirs, dir) 491 } 492} 493 494func readImportCfg(file string) { 495 if Flag.Cfg.ImportMap == nil { 496 Flag.Cfg.ImportMap = make(map[string]string) 497 } 498 Flag.Cfg.PackageFile = map[string]string{} 499 data, err := os.ReadFile(file) 500 if err != nil { 501 log.Fatalf("-importcfg: %v", err) 502 } 503 504 for lineNum, line := range strings.Split(string(data), "\n") { 505 lineNum++ // 1-based 506 line = strings.TrimSpace(line) 507 if line == "" || strings.HasPrefix(line, "#") { 508 continue 509 } 510 511 verb, args, found := strings.Cut(line, " ") 512 if found { 513 args = strings.TrimSpace(args) 514 } 515 before, after, hasEq := strings.Cut(args, "=") 516 517 switch verb { 518 default: 519 log.Fatalf("%s:%d: unknown directive %q", file, lineNum, verb) 520 case "importmap": 521 if !hasEq || before == "" || after == "" { 522 log.Fatalf(`%s:%d: invalid importmap: syntax is "importmap old=new"`, file, lineNum) 523 } 524 Flag.Cfg.ImportMap[before] = after 525 case "packagefile": 526 if !hasEq || before == "" || after == "" { 527 log.Fatalf(`%s:%d: invalid packagefile: syntax is "packagefile path=filename"`, file, lineNum) 528 } 529 Flag.Cfg.PackageFile[before] = after 530 } 531 } 532} 533 534func readCoverageCfg(file string) { 535 var cfg covcmd.CoverFixupConfig 536 data, err := os.ReadFile(file) 537 if err != nil { 538 log.Fatalf("-coveragecfg: %v", err) 539 } 540 if err := json.Unmarshal(data, &cfg); err != nil { 541 log.Fatalf("error reading -coveragecfg file %q: %v", file, err) 542 } 543 Flag.Cfg.CoverageInfo = &cfg 544} 545 546func readEmbedCfg(file string) { 547 data, err := os.ReadFile(file) 548 if err != nil { 549 log.Fatalf("-embedcfg: %v", err) 550 } 551 if err := json.Unmarshal(data, &Flag.Cfg.Embed); err != nil { 552 log.Fatalf("%s: %v", file, err) 553 } 554 if Flag.Cfg.Embed.Patterns == nil { 555 log.Fatalf("%s: invalid embedcfg: missing Patterns", file) 556 } 557 if Flag.Cfg.Embed.Files == nil { 558 log.Fatalf("%s: invalid embedcfg: missing Files", file) 559 } 560} 561 562// parseSpectre parses the spectre configuration from the string s. 563func parseSpectre(s string) { 564 for _, f := range strings.Split(s, ",") { 565 f = strings.TrimSpace(f) 566 switch f { 567 default: 568 log.Fatalf("unknown setting -spectre=%s", f) 569 case "": 570 // nothing 571 case "all": 572 Flag.Cfg.SpectreIndex = true 573 Ctxt.Retpoline = true 574 case "index": 575 Flag.Cfg.SpectreIndex = true 576 case "ret": 577 Ctxt.Retpoline = true 578 } 579 } 580 581 if Flag.Cfg.SpectreIndex { 582 switch buildcfg.GOARCH { 583 case "amd64": 584 // ok 585 default: 586 log.Fatalf("GOARCH=%s does not support -spectre=index", buildcfg.GOARCH) 587 } 588 } 589} 590