func Ldmain() {
Bso = bufio.NewWriter(os.Stdout)
Ctxt = linknew(SysArch)
Ctxt.Diag = Diag
Ctxt.Bso = Bso
Debug = [128]int{}
nerrors = 0
outfile = ""
HEADTYPE = -1
INITTEXT = -1
INITDAT = -1
INITRND = -1
INITENTRY = ""
Linkmode = LinkAuto
// For testing behavior of go command when tools crash silently.
// Undocumented, not in standard flag parser to avoid
// exposing in usage message.
for _, arg := range os.Args {
if arg == "-crash_for_testing" {
os.Exit(2)
}
}
if SysArch.Family == sys.AMD64 && obj.Getgoos() == "plan9" {
obj.Flagcount("8", "use 64-bit addresses in symbol table", &Debug['8'])
}
obj.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF", addbuildinfo)
obj.Flagcount("C", "check Go calls to C code", &Debug['C'])
obj.Flagint64("D", "set data segment `address`", &INITDAT)
obj.Flagstr("E", "set `entry` symbol name", &INITENTRY)
obj.Flagfn1("I", "use `linker` as ELF dynamic linker", setinterp)
obj.Flagfn1("L", "add specified `directory` to library path", Lflag)
obj.Flagfn1("H", "set header `type`", setheadtype)
obj.Flagint32("R", "set address rounding `quantum`", &INITRND)
obj.Flagint64("T", "set text segment `address`", &INITTEXT)
obj.Flagfn0("V", "print version and exit", doversion)
obj.Flagfn1("X", "add string value `definition` of the form importpath.name=value", addstrdata1)
obj.Flagcount("a", "disassemble output", &Debug['a'])
obj.Flagstr("buildid", "record `id` as Go toolchain build id", &buildid)
flag.Var(&Buildmode, "buildmode", "set build `mode`")
obj.Flagcount("c", "dump call graph", &Debug['c'])
obj.Flagcount("d", "disable dynamic executable", &Debug['d'])
flag.BoolVar(&flag_dumpdep, "dumpdep", false, "dump symbol dependency graph")
obj.Flagstr("extar", "archive program for buildmode=c-archive", &extar)
obj.Flagstr("extld", "use `linker` when linking in external mode", &extld)
obj.Flagstr("extldflags", "pass `flags` to external linker", &extldflags)
obj.Flagcount("f", "ignore version mismatch", &Debug['f'])
obj.Flagcount("g", "disable go package data checks", &Debug['g'])
obj.Flagcount("h", "halt on error", &Debug['h'])
obj.Flagstr("installsuffix", "set package directory `suffix`", &flag_installsuffix)
obj.Flagstr("k", "set field tracking `symbol`", &tracksym)
obj.Flagstr("libgcc", "compiler support lib for internal linking; use \"none\" to disable", &libgccfile)
obj.Flagfn1("linkmode", "set link `mode` (internal, external, auto)", setlinkmode)
flag.BoolVar(&Linkshared, "linkshared", false, "link against installed Go shared libraries")
obj.Flagcount("msan", "enable MSan interface", &flag_msan)
obj.Flagcount("n", "dump symbol table", &Debug['n'])
obj.Flagstr("o", "write output to `file`", &outfile)
flag.Var(&rpath, "r", "set the ELF dynamic linker search `path` to dir1:dir2:...")
obj.Flagcount("race", "enable race detector", &flag_race)
obj.Flagcount("s", "disable symbol table", &Debug['s'])
var flagShared int
if SysArch.InFamily(sys.ARM, sys.AMD64) {
obj.Flagcount("shared", "generate shared object (implies -linkmode external)", &flagShared)
}
obj.Flagstr("tmpdir", "use `directory` for temporary files", &tmpdir)
obj.Flagcount("u", "reject unsafe packages", &Debug['u'])
obj.Flagcount("v", "print link trace", &Debug['v'])
obj.Flagcount("w", "disable DWARF generation", &Debug['w'])
obj.Flagstr("cpuprofile", "write cpu profile to `file`", &cpuprofile)
obj.Flagstr("memprofile", "write memory profile to `file`", &memprofile)
obj.Flagint64("memprofilerate", "set runtime.MemProfileRate to `rate`", &memprofilerate)
obj.Flagparse(usage)
startProfile()
Ctxt.Bso = Bso
Ctxt.Debugvlog = int32(Debug['v'])
if flagShared != 0 {
if Buildmode == BuildmodeUnset {
Buildmode = BuildmodeCShared
} else if Buildmode != BuildmodeCShared {
Exitf("-shared and -buildmode=%s are incompatible", Buildmode.String())
}
}
if Buildmode == BuildmodeUnset {
Buildmode = BuildmodeExe
}
if Buildmode != BuildmodeShared && flag.NArg() != 1 {
usage()
}
if outfile == "" {
outfile = "a.out"
if HEADTYPE == obj.Hwindows {
outfile += ".exe"
}
}
libinit() // creates outfile
if HEADTYPE == -1 {
HEADTYPE = int32(headtype(goos))
}
Ctxt.Headtype = int(HEADTYPE)
if headstring == "" {
headstring = Headstr(int(HEADTYPE))
}
Thearch.Archinit()
if Linkshared && !Iself {
Exitf("-linkshared can only be used on elf systems")
}
if Debug['v'] != 0 {
fmt.Fprintf(Bso, "HEADER = -H%d -T0x%x -D0x%x -R0x%x\n", HEADTYPE, uint64(INITTEXT), uint64(INITDAT), uint32(INITRND))
}
Bso.Flush()
if Buildmode == BuildmodeShared {
for i := 0; i < flag.NArg(); i++ {
arg := flag.Arg(i)
parts := strings.SplitN(arg, "=", 2)
var pkgpath, file string
if len(parts) == 1 {
pkgpath, file = "main", arg
} else {
pkgpath, file = parts[0], parts[1]
}
pkglistfornote = append(pkglistfornote, pkgpath...)
pkglistfornote = append(pkglistfornote, '\n')
addlibpath(Ctxt, "command line", "command line", file, pkgpath, "")
}
} else {
addlibpath(Ctxt, "command line", "command line", flag.Arg(0), "main", "")
}
loadlib()
checkstrdata()
deadcode(Ctxt)
fieldtrack(Ctxt)
callgraph()
doelf()
if HEADTYPE == obj.Hdarwin {
domacho()
}
dostkcheck()
if HEADTYPE == obj.Hwindows {
dope()
}
addexport()
Thearch.Gentext() // trampolines, call stubs, etc.
textbuildid()
textaddress()
pclntab()
findfunctab()
symtab()
dodata()
address()
reloc()
Thearch.Asmb()
undef()
hostlink()
archive()
if Debug['v'] != 0 {
fmt.Fprintf(Bso, "%5.2f cpu time\n", obj.Cputime())
fmt.Fprintf(Bso, "%d symbols\n", len(Ctxt.Allsym))
fmt.Fprintf(Bso, "%d liveness data\n", liveness)
}
Bso.Flush()
errorexit()
}
func Main() {
defer hidePanic()
goarch = obj.Getgoarch()
Ctxt = obj.Linknew(Thearch.LinkArch)
Ctxt.DiagFunc = Yyerror
bstdout = bufio.NewWriter(os.Stdout)
Ctxt.Bso = bstdout
localpkg = mkpkg("")
localpkg.Prefix = "\"\""
autopkg = mkpkg("")
autopkg.Prefix = "\"\""
// pseudo-package, for scoping
builtinpkg = mkpkg("go.builtin")
builtinpkg.Prefix = "go.builtin" // not go%2ebuiltin
// pseudo-package, accessed by import "unsafe"
unsafepkg = mkpkg("unsafe")
unsafepkg.Name = "unsafe"
// real package, referred to by generated runtime calls
Runtimepkg = mkpkg("runtime")
Runtimepkg.Name = "runtime"
// pseudo-packages used in symbol tables
itabpkg = mkpkg("go.itab")
itabpkg.Name = "go.itab"
itabpkg.Prefix = "go.itab" // not go%2eitab
itablinkpkg = mkpkg("go.itablink")
itablinkpkg.Name = "go.itablink"
itablinkpkg.Prefix = "go.itablink" // not go%2eitablink
trackpkg = mkpkg("go.track")
trackpkg.Name = "go.track"
trackpkg.Prefix = "go.track" // not go%2etrack
typepkg = mkpkg("type")
typepkg.Name = "type"
// pseudo-package used for map zero values
mappkg = mkpkg("go.map")
mappkg.Name = "go.map"
mappkg.Prefix = "go.map"
goroot = obj.Getgoroot()
goos = obj.Getgoos()
Nacl = goos == "nacl"
if Nacl {
flag_largemodel = true
}
flag.BoolVar(&compiling_runtime, "+", false, "compiling runtime")
obj.Flagcount("%", "debug non-static initializers", &Debug['%'])
obj.Flagcount("A", "for bootstrapping, allow 'any' type", &Debug['A'])
obj.Flagcount("B", "disable bounds checking", &Debug['B'])
flag.StringVar(&localimport, "D", "", "set relative `path` for local imports")
obj.Flagcount("E", "debug symbol export", &Debug['E'])
obj.Flagfn1("I", "add `directory` to import search path", addidir)
obj.Flagcount("K", "debug missing line numbers", &Debug['K'])
obj.Flagcount("M", "debug move generation", &Debug['M'])
obj.Flagcount("N", "disable optimizations", &Debug['N'])
obj.Flagcount("P", "debug peephole optimizer", &Debug['P'])
obj.Flagcount("R", "debug register optimizer", &Debug['R'])
obj.Flagcount("S", "print assembly listing", &Debug['S'])
obj.Flagfn0("V", "print compiler version", doversion)
obj.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.BoolVar(&pure_go, "complete", false, "compiling complete package (no C or assembly)")
flag.StringVar(&debugstr, "d", "", "print debug information about items in `list`")
obj.Flagcount("e", "no limit on number of errors reported", &Debug['e'])
obj.Flagcount("f", "debug stack frames", &Debug['f'])
obj.Flagcount("g", "debug code generation", &Debug['g'])
obj.Flagcount("h", "halt on error", &Debug['h'])
obj.Flagcount("i", "debug line number stack", &Debug['i'])
obj.Flagfn1("importmap", "add `definition` of the form source=actual to import map", addImportMap)
flag.StringVar(&flag_installsuffix, "installsuffix", "", "set pkg directory `suffix`")
obj.Flagcount("j", "debug runtime-initialized variables", &Debug['j'])
obj.Flagcount("l", "disable inlining", &Debug['l'])
flag.StringVar(&linkobj, "linkobj", "", "write linker-specific object to `file`")
obj.Flagcount("live", "debug liveness analysis", &debuglive)
obj.Flagcount("m", "print optimization decisions", &Debug['m'])
flag.BoolVar(&flag_msan, "msan", false, "build code compatible with C/C++ memory sanitizer")
flag.BoolVar(&newexport, "newexport", true, "use new export format") // TODO(gri) remove eventually (issue 15323)
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 package file instead of object file")
obj.Flagcount("r", "debug generated wrappers", &Debug['r'])
flag.BoolVar(&flag_race, "race", false, "enable race detector")
obj.Flagcount("s", "warn about composite literals that can be simplified", &Debug['s'])
flag.StringVar(&Ctxt.LineHist.TrimPathPrefix, "trimpath", "", "remove `prefix` from recorded source file paths")
flag.BoolVar(&safemode, "u", false, "reject unsafe code")
obj.Flagcount("v", "increase debug verbosity", &Debug['v'])
obj.Flagcount("w", "debug type checking", &Debug['w'])
flag.BoolVar(&use_writebarrier, "wb", true, "enable write barrier")
obj.Flagcount("x", "debug lexer", &Debug['x'])
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")
}
if Thearch.LinkArch.Family == sys.AMD64 {
flag.BoolVar(&flag_largemodel, "largemodel", false, "generate code that assumes a large memory model")
}
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`")
flag.BoolVar(&ssaEnabled, "ssa", true, "use SSA backend to generate code")
obj.Flagparse(usage)
Ctxt.Flag_shared = flag_dynlink || flag_shared
Ctxt.Flag_dynlink = flag_dynlink
Ctxt.Flag_optimize = Debug['N'] == 0
Ctxt.Debugasm = int32(Debug['S'])
Ctxt.Debugvlog = int32(Debug['v'])
if flag.NArg() < 1 {
usage()
}
startProfile()
if flag_race {
racepkg = mkpkg("runtime/race")
racepkg.Name = "race"
}
if flag_msan {
msanpkg = mkpkg("runtime/msan")
msanpkg.Name = "msan"
}
if flag_race && flag_msan {
log.Fatal("cannot use both -race and -msan")
} else if flag_race || flag_msan {
instrumenting = true
}
// parse -d argument
if debugstr != "" {
Split:
for _, name := range strings.Split(debugstr, ",") {
if name == "" {
continue
}
val := 1
if i := strings.Index(name, "="); i >= 0 {
var err error
val, err = strconv.Atoi(name[i+1:])
if err != nil {
log.Fatalf("invalid debug value %v", name)
}
name = name[:i]
}
for _, t := range debugtab {
if t.name == name {
if t.val != nil {
*t.val = val
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)
if err != "" {
log.Fatalf(err)
}
continue Split
}
log.Fatalf("unknown debug key -d %s\n", name)
}
}
// enable inlining. for now:
// default: inlining on. (debug['l'] == 1)
// -l: inlining off (debug['l'] == 0)
// -ll, -lll: inlining on again, with extra debugging (debug['l'] > 1)
if Debug['l'] <= 1 {
Debug['l'] = 1 - Debug['l']
}
Thearch.Betypeinit()
Widthint = Thearch.LinkArch.IntSize
Widthptr = Thearch.LinkArch.PtrSize
Widthreg = Thearch.LinkArch.RegSize
initUniverse()
blockgen = 1
dclcontext = PEXTERN
nerrors = 0
lexlineno = 1
loadsys()
for _, infile = range flag.Args() {
if trace && Debug['x'] != 0 {
fmt.Printf("--- %s ---\n", infile)
}
linehistpush(infile)
f, err := os.Open(infile)
if err != nil {
fmt.Printf("open %s: %v\n", infile, err)
errorexit()
}
bin := bufio.NewReader(f)
// Skip initial BOM if present.
if r, _, _ := bin.ReadRune(); r != BOM {
bin.UnreadRune()
}
block = 1
iota_ = -1000000
imported_unsafe = false
parse_file(bin)
if nsyntaxerrors != 0 {
errorexit()
}
// Instead of converting EOF into '\n' in getc and count it as an extra line
// for the line history to work, and which then has to be corrected elsewhere,
// just add a line here.
lexlineno++
linehistpop()
f.Close()
}
testdclstack()
mkpackage(localpkg.Name) // final import not used checks
finishUniverse()
typecheckok = true
if Debug['f'] != 0 {
frame(1)
}
// 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.
defercheckwidth()
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op != ODCL && xtop[i].Op != OAS && xtop[i].Op != OAS2 {
xtop[i] = typecheck(xtop[i], Etop)
}
}
// Phase 2: Variable assignments.
// To check interface assignments, depends on phase 1.
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCL || xtop[i].Op == OAS || xtop[i].Op == OAS2 {
xtop[i] = typecheck(xtop[i], Etop)
}
}
resumecheckwidth()
// Phase 3: Type check function bodies.
// Don't use range--typecheck can add closures to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCLFUNC || xtop[i].Op == OCLOSURE {
Curfn = xtop[i]
decldepth = 1
saveerrors()
typecheckslice(Curfn.Nbody.Slice(), Etop)
checkreturn(Curfn)
if nerrors != 0 {
Curfn.Nbody.Set(nil) // type errors; do not compile
}
}
}
// Phase 4: Decide how to capture closed variables.
// This needs to run before escape analysis,
// because variables captured by value do not escape.
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
capturevars(n)
}
}
Curfn = nil
if nsavederrors+nerrors != 0 {
errorexit()
}
// Phase 5: Inlining
if Debug['l'] > 1 {
// Typecheck imported function bodies if debug['l'] > 1,
// otherwise lazily when used or re-exported.
for _, n := range importlist {
if n.Func.Inl.Len() != 0 {
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) {
for _, n := range list {
if n.Op == ODCLFUNC {
caninl(n)
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.
escapes(xtop)
// 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.
for _, n := range xtop {
if n.Op == ODCLFUNC && n.Func.Closure != nil {
Curfn = n
transformclosure(n)
}
}
Curfn = nil
// Phase 8: Compile top level functions.
// Don't use range--walk can add functions to xtop.
for i := 0; i < len(xtop); i++ {
if xtop[i].Op == ODCLFUNC {
funccompile(xtop[i])
}
}
if nsavederrors+nerrors == 0 {
fninit(xtop)
}
if compiling_runtime {
checknowritebarrierrec()
}
// Phase 9: Check external declarations.
for i, n := range externdcl {
if n.Op == ONAME {
externdcl[i] = typecheck(externdcl[i], Erv)
}
}
if nerrors+nsavederrors != 0 {
errorexit()
}
dumpobj()
if asmhdr != "" {
dumpasmhdr()
}
if nerrors+nsavederrors != 0 {
errorexit()
}
Flusherrors()
}