// Inferno utils/6l/obj.c // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c // // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) // Portions Copyright © 1997-1999 Vita Nuova Limited // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) // Portions Copyright © 2004,2006 Bruce Ellis // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others // Portions Copyright © 2009 The Go Authors. All rights reserved. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. package ld import ( "cmd/internal/obj" "flag" "fmt" "os" "strings" ) var ( pkglistfornote []byte buildid string ) func Ldmain() { Ctxt = linknew(Thelinkarch) Ctxt.Thechar = int32(Thearch.Thechar) Ctxt.Thestring = Thestring Ctxt.Diag = Diag Ctxt.Bso = &Bso Bso = *obj.Binitw(os.Stdout) 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 Thearch.Thechar == '6' && 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.Flagcount("W", "disassemble input", &Debug['W']) 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']) 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.Flagfn1("linkmode", "set link `mode` (internal, external, auto)", setlinkmode) flag.BoolVar(&Linkshared, "linkshared", false, "link against installed Go shared libraries") 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 Thearch.Thechar == '5' || Thearch.Thechar == '6' { 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) // Clumsy hack to preserve old two-argument -X name val syntax for old scripts. // Rewrite that syntax into new syntax -X name=val. // TODO(rsc): Delete this hack in Go 1.6 or later. var args []string for i := 0; i < len(os.Args); i++ { arg := os.Args[i] if (arg == "-X" || arg == "--X") && i+2 < len(os.Args) && !strings.Contains(os.Args[i+1], "=") { fmt.Fprintf(os.Stderr, "link: warning: option %s %s %s may not work in future releases; use %s %s=%s\n", arg, os.Args[i+1], os.Args[i+2], arg, os.Args[i+1], os.Args[i+2]) args = append(args, arg) args = append(args, os.Args[i+1]+"="+os.Args[i+2]) i += 2 continue } if (strings.HasPrefix(arg, "-X=") || strings.HasPrefix(arg, "--X=")) && i+1 < len(os.Args) && strings.Count(arg, "=") == 1 { fmt.Fprintf(os.Stderr, "link: warning: option %s %s may not work in future releases; use %s=%s\n", arg, os.Args[i+1], arg, os.Args[i+1]) args = append(args, arg+"="+os.Args[i+1]) i++ continue } args = append(args, arg) } os.Args = args 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() if Thearch.Thechar == '5' { // mark some functions that are only referenced after linker code editing if Ctxt.Goarm == 5 { mark(Linkrlookup(Ctxt, "_sfloat", 0)) } mark(Linklookup(Ctxt, "runtime.read_tls_fallback", 0)) } checkgo() checkstrdata() deadcode() 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() doweak() 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", Ctxt.Nsymbol) fmt.Fprintf(&Bso, "%d liveness data\n", liveness) } Bso.Flush() errorexit() }