mirror of
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25e9417b98
This patch converts the linker's Asmb2 phase to use loader APIs for AMD64 (other architectures to be converted in a subsequent patch). Change-Id: I5a9aa9b03769cabc1a22b982f48fd113213d7bcf Reviewed-on: https://go-review.googlesource.com/c/go/+/233338 Run-TryBot: Than McIntosh <thanm@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
401 lines
13 KiB
Go
401 lines
13 KiB
Go
// Inferno utils/6l/obj.c
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// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/obj.c
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package ld
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import (
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"bufio"
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"cmd/internal/goobj2"
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"cmd/internal/objabi"
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"cmd/internal/sys"
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"cmd/link/internal/benchmark"
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"flag"
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"log"
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"os"
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"runtime"
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"runtime/pprof"
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"strings"
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)
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var (
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pkglistfornote []byte
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windowsgui bool // writes a "GUI binary" instead of a "console binary"
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ownTmpDir bool // set to true if tmp dir created by linker (e.g. no -tmpdir)
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)
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func init() {
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flag.Var(&rpath, "r", "set the ELF dynamic linker search `path` to dir1:dir2:...")
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}
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// Flags used by the linker. The exported flags are used by the architecture-specific packages.
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var (
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flagBuildid = flag.String("buildid", "", "record `id` as Go toolchain build id")
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flagOutfile = flag.String("o", "", "write output to `file`")
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flagPluginPath = flag.String("pluginpath", "", "full path name for plugin")
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flagInstallSuffix = flag.String("installsuffix", "", "set package directory `suffix`")
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flagDumpDep = flag.Bool("dumpdep", false, "dump symbol dependency graph")
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flagRace = flag.Bool("race", false, "enable race detector")
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flagMsan = flag.Bool("msan", false, "enable MSan interface")
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flagFieldTrack = flag.String("k", "", "set field tracking `symbol`")
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flagLibGCC = flag.String("libgcc", "", "compiler support lib for internal linking; use \"none\" to disable")
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flagTmpdir = flag.String("tmpdir", "", "use `directory` for temporary files")
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flagExtld = flag.String("extld", "", "use `linker` when linking in external mode")
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flagExtldflags = flag.String("extldflags", "", "pass `flags` to external linker")
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flagExtar = flag.String("extar", "", "archive program for buildmode=c-archive")
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flagA = flag.Bool("a", false, "no-op (deprecated)")
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FlagC = flag.Bool("c", false, "dump call graph")
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FlagD = flag.Bool("d", false, "disable dynamic executable")
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flagF = flag.Bool("f", false, "ignore version mismatch")
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flagG = flag.Bool("g", false, "disable go package data checks")
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flagH = flag.Bool("h", false, "halt on error")
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flagN = flag.Bool("n", false, "dump symbol table")
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FlagS = flag.Bool("s", false, "disable symbol table")
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flagU = flag.Bool("u", false, "reject unsafe packages")
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FlagW = flag.Bool("w", false, "disable DWARF generation")
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Flag8 bool // use 64-bit addresses in symbol table
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flagInterpreter = flag.String("I", "", "use `linker` as ELF dynamic linker")
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FlagDebugTramp = flag.Int("debugtramp", 0, "debug trampolines")
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FlagStrictDups = flag.Int("strictdups", 0, "sanity check duplicate symbol contents during object file reading (1=warn 2=err).")
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FlagRound = flag.Int("R", -1, "set address rounding `quantum`")
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FlagTextAddr = flag.Int64("T", -1, "set text segment `address`")
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flagEntrySymbol = flag.String("E", "", "set `entry` symbol name")
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cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
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memprofile = flag.String("memprofile", "", "write memory profile to `file`")
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memprofilerate = flag.Int64("memprofilerate", 0, "set runtime.MemProfileRate to `rate`")
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benchmarkFlag = flag.String("benchmark", "", "set to 'mem' or 'cpu' to enable phase benchmarking")
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benchmarkFileFlag = flag.String("benchmarkprofile", "", "emit phase profiles to `base`_phase.{cpu,mem}prof")
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)
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// Main is the main entry point for the linker code.
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func Main(arch *sys.Arch, theArch Arch) {
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thearch = theArch
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ctxt := linknew(arch)
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ctxt.Bso = bufio.NewWriter(os.Stdout)
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// For testing behavior of go command when tools crash silently.
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// Undocumented, not in standard flag parser to avoid
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// exposing in usage message.
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for _, arg := range os.Args {
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if arg == "-crash_for_testing" {
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os.Exit(2)
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}
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}
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final := gorootFinal()
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addstrdata1(ctxt, "runtime/internal/sys.DefaultGoroot="+final)
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addstrdata1(ctxt, "cmd/internal/objabi.defaultGOROOT="+final)
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// TODO(matloob): define these above and then check flag values here
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if ctxt.Arch.Family == sys.AMD64 && objabi.GOOS == "plan9" {
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flag.BoolVar(&Flag8, "8", false, "use 64-bit addresses in symbol table")
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}
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flagHeadType := flag.String("H", "", "set header `type`")
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flag.BoolVar(&ctxt.linkShared, "linkshared", false, "link against installed Go shared libraries")
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flag.Var(&ctxt.LinkMode, "linkmode", "set link `mode`")
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flag.Var(&ctxt.BuildMode, "buildmode", "set build `mode`")
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flag.BoolVar(&ctxt.compressDWARF, "compressdwarf", true, "compress DWARF if possible")
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objabi.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF", addbuildinfo)
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objabi.Flagfn1("L", "add specified `directory` to library path", func(a string) { Lflag(ctxt, a) })
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objabi.AddVersionFlag() // -V
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objabi.Flagfn1("X", "add string value `definition` of the form importpath.name=value", func(s string) { addstrdata1(ctxt, s) })
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objabi.Flagcount("v", "print link trace", &ctxt.Debugvlog)
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objabi.Flagfn1("importcfg", "read import configuration from `file`", ctxt.readImportCfg)
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objabi.Flagparse(usage)
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switch *flagHeadType {
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case "":
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case "windowsgui":
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ctxt.HeadType = objabi.Hwindows
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windowsgui = true
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default:
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if err := ctxt.HeadType.Set(*flagHeadType); err != nil {
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Errorf(nil, "%v", err)
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usage()
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}
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}
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if ctxt.HeadType == objabi.Hunknown {
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ctxt.HeadType.Set(objabi.GOOS)
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}
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checkStrictDups = *FlagStrictDups
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startProfile()
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if ctxt.BuildMode == BuildModeUnset {
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ctxt.BuildMode = BuildModeExe
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}
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if ctxt.BuildMode != BuildModeShared && flag.NArg() != 1 {
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usage()
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}
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if *flagOutfile == "" {
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*flagOutfile = "a.out"
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if ctxt.HeadType == objabi.Hwindows {
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*flagOutfile += ".exe"
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}
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}
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interpreter = *flagInterpreter
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// enable benchmarking
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var bench *benchmark.Metrics
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if len(*benchmarkFlag) != 0 {
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if *benchmarkFlag == "mem" {
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bench = benchmark.New(benchmark.GC, *benchmarkFileFlag)
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} else if *benchmarkFlag == "cpu" {
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bench = benchmark.New(benchmark.NoGC, *benchmarkFileFlag)
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} else {
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Errorf(nil, "unknown benchmark flag: %q", *benchmarkFlag)
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usage()
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}
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}
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bench.Start("libinit")
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libinit(ctxt) // creates outfile
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bench.Start("computeTLSOffset")
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ctxt.computeTLSOffset()
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bench.Start("Archinit")
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thearch.Archinit(ctxt)
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if ctxt.linkShared && !ctxt.IsELF {
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Exitf("-linkshared can only be used on elf systems")
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}
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if ctxt.Debugvlog != 0 {
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ctxt.Logf("HEADER = -H%d -T0x%x -R0x%x\n", ctxt.HeadType, uint64(*FlagTextAddr), uint32(*FlagRound))
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}
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zerofp := goobj2.FingerprintType{}
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switch ctxt.BuildMode {
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case BuildModeShared:
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for i := 0; i < flag.NArg(); i++ {
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arg := flag.Arg(i)
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parts := strings.SplitN(arg, "=", 2)
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var pkgpath, file string
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if len(parts) == 1 {
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pkgpath, file = "main", arg
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} else {
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pkgpath, file = parts[0], parts[1]
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}
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pkglistfornote = append(pkglistfornote, pkgpath...)
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pkglistfornote = append(pkglistfornote, '\n')
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addlibpath(ctxt, "command line", "command line", file, pkgpath, "", zerofp)
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}
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case BuildModePlugin:
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addlibpath(ctxt, "command line", "command line", flag.Arg(0), *flagPluginPath, "", zerofp)
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default:
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addlibpath(ctxt, "command line", "command line", flag.Arg(0), "main", "", zerofp)
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}
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bench.Start("loadlib")
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ctxt.loadlib()
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bench.Start("deadcode")
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deadcode(ctxt)
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bench.Start("linksetup")
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ctxt.linksetup()
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bench.Start("dostrdata")
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ctxt.dostrdata()
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if objabi.Fieldtrack_enabled != 0 {
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bench.Start("fieldtrack")
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fieldtrack(ctxt.Arch, ctxt.loader)
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}
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bench.Start("dwarfGenerateDebugInfo")
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dwarfGenerateDebugInfo(ctxt)
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bench.Start("callgraph")
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ctxt.callgraph()
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bench.Start("dostkcheck")
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ctxt.dostkcheck()
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bench.Start("mangleTypeSym")
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ctxt.mangleTypeSym()
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if ctxt.IsELF {
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bench.Start("doelf")
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ctxt.doelf()
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}
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if ctxt.IsDarwin() {
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bench.Start("domacho")
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ctxt.domacho()
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}
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if ctxt.IsWindows() {
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bench.Start("dope")
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ctxt.dope()
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bench.Start("windynrelocsyms")
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ctxt.windynrelocsyms()
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}
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if ctxt.IsAIX() {
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bench.Start("doxcoff")
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ctxt.doxcoff()
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}
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bench.Start("textbuildid")
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ctxt.textbuildid()
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bench.Start("addexport")
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setupdynexp(ctxt)
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ctxt.setArchSyms(BeforeLoadlibFull)
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ctxt.addexport()
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bench.Start("Gentext")
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thearch.Gentext2(ctxt, ctxt.loader) // trampolines, call stubs, etc.
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bench.Start("textaddress")
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ctxt.textaddress()
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bench.Start("typelink")
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ctxt.typelink()
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bench.Start("buildinfo")
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ctxt.buildinfo()
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bench.Start("pclntab")
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container := ctxt.pclntab()
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bench.Start("findfunctab")
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ctxt.findfunctab(container)
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bench.Start("dwarfGenerateDebugSyms")
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dwarfGenerateDebugSyms(ctxt)
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bench.Start("symtab")
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symGroupType := ctxt.symtab()
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bench.Start("dodata")
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ctxt.dodata2(symGroupType)
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bench.Start("address")
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order := ctxt.address()
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bench.Start("dwarfcompress")
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dwarfcompress(ctxt)
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bench.Start("layout")
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filesize := ctxt.layout(order)
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// Write out the output file.
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// It is split into two parts (Asmb and Asmb2). The first
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// part writes most of the content (sections and segments),
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// for which we have computed the size and offset, in a
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// mmap'd region. The second part writes more content, for
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// which we don't know the size.
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if ctxt.Arch.Family != sys.Wasm {
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// Don't mmap if we're building for Wasm. Wasm file
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// layout is very different so filesize is meaningless.
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if err := ctxt.Out.Mmap(filesize); err != nil {
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panic(err)
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}
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}
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// Asmb will redirect symbols to the output file mmap, and relocations
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// will be applied directly there.
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bench.Start("Asmb")
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ctxt.loader.InitOutData()
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thearch.Asmb(ctxt, ctxt.loader)
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bench.Start("reloc")
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ctxt.reloc()
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newasmb2 := ctxt.IsDarwin() || ctxt.IsWindows() || ctxt.IsWasm() || ctxt.IsPlan9() || (ctxt.IsElf() && ctxt.IsAMD64())
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if !newasmb2 {
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bench.Start("loadlibfull")
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// We don't need relocations at this point.
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needReloc := false
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// On AMD64 ELF, we directly use the loader's ExtRelocs, so we don't
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// need conversion. Otherwise we do.
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needExtReloc := ctxt.IsExternal() && !(ctxt.IsAMD64() && ctxt.IsELF)
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ctxt.loadlibfull(symGroupType, needReloc, needExtReloc) // XXX do it here for now
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}
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bench.Start("Asmb2")
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thearch.Asmb2(ctxt, ctxt.loader)
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bench.Start("Munmap")
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ctxt.Out.Close() // Close handles Munmapping if necessary.
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bench.Start("hostlink")
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ctxt.hostlink()
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if ctxt.Debugvlog != 0 {
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ctxt.Logf("%d symbols, %d reachable\n", len(ctxt.loader.Syms), ctxt.loader.NReachableSym())
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ctxt.Logf("%d liveness data\n", liveness)
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}
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bench.Start("Flush")
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ctxt.Bso.Flush()
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bench.Start("archive")
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ctxt.archive()
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bench.Report(os.Stdout)
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errorexit()
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}
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type Rpath struct {
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set bool
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val string
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}
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func (r *Rpath) Set(val string) error {
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r.set = true
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r.val = val
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return nil
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}
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func (r *Rpath) String() string {
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return r.val
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}
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func startProfile() {
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if *cpuprofile != "" {
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f, err := os.Create(*cpuprofile)
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if err != nil {
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log.Fatalf("%v", err)
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}
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if err := pprof.StartCPUProfile(f); err != nil {
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log.Fatalf("%v", err)
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}
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AtExit(pprof.StopCPUProfile)
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}
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if *memprofile != "" {
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if *memprofilerate != 0 {
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runtime.MemProfileRate = int(*memprofilerate)
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}
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f, err := os.Create(*memprofile)
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if err != nil {
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log.Fatalf("%v", err)
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}
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AtExit(func() {
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// Profile all outstanding allocations.
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runtime.GC()
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// compilebench parses the memory profile to extract memstats,
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// which are only written in the legacy pprof format.
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// See golang.org/issue/18641 and runtime/pprof/pprof.go:writeHeap.
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const writeLegacyFormat = 1
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if err := pprof.Lookup("heap").WriteTo(f, writeLegacyFormat); err != nil {
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log.Fatalf("%v", err)
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}
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})
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}
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}
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