github.com/4ad/go@v0.0.0-20161219182952-69a12818b605/src/cmd/internal/obj/sym.go (about)

     1  // Derived from Inferno utils/6l/obj.c and utils/6l/span.c
     2  // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
     3  // http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c
     4  //
     5  //	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     6  //	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
     7  //	Portions Copyright © 1997-1999 Vita Nuova Limited
     8  //	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
     9  //	Portions Copyright © 2004,2006 Bruce Ellis
    10  //	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
    11  //	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
    12  //	Portions Copyright © 2009 The Go Authors. All rights reserved.
    13  //
    14  // Permission is hereby granted, free of charge, to any person obtaining a copy
    15  // of this software and associated documentation files (the "Software"), to deal
    16  // in the Software without restriction, including without limitation the rights
    17  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    18  // copies of the Software, and to permit persons to whom the Software is
    19  // furnished to do so, subject to the following conditions:
    20  //
    21  // The above copyright notice and this permission notice shall be included in
    22  // all copies or substantial portions of the Software.
    23  //
    24  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    25  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    26  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    27  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    28  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    29  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    30  // THE SOFTWARE.
    31  
    32  package obj
    33  
    34  import (
    35  	"cmd/internal/sys"
    36  	"log"
    37  	"os"
    38  	"path/filepath"
    39  	"strconv"
    40  )
    41  
    42  var headers = []struct {
    43  	name string
    44  	val  int
    45  }{
    46  	{"darwin", Hdarwin},
    47  	{"dragonfly", Hdragonfly},
    48  	{"freebsd", Hfreebsd},
    49  	{"linux", Hlinux},
    50  	{"android", Hlinux}, // must be after "linux" entry or else headstr(Hlinux) == "android"
    51  	{"nacl", Hnacl},
    52  	{"netbsd", Hnetbsd},
    53  	{"openbsd", Hopenbsd},
    54  	{"plan9", Hplan9},
    55  	{"solaris", Hsolaris},
    56  	{"windows", Hwindows},
    57  	{"windowsgui", Hwindows},
    58  }
    59  
    60  func headtype(name string) int {
    61  	for i := 0; i < len(headers); i++ {
    62  		if name == headers[i].name {
    63  			return headers[i].val
    64  		}
    65  	}
    66  	return -1
    67  }
    68  
    69  func Headstr(v int) string {
    70  	for i := 0; i < len(headers); i++ {
    71  		if v == headers[i].val {
    72  			return headers[i].name
    73  		}
    74  	}
    75  	return strconv.Itoa(v)
    76  }
    77  
    78  func Linknew(arch *LinkArch) *Link {
    79  	ctxt := new(Link)
    80  	ctxt.Hash = make(map[SymVer]*LSym)
    81  	ctxt.Arch = arch
    82  	ctxt.Version = HistVersion
    83  	ctxt.Goroot = Getgoroot()
    84  	ctxt.Goroot_final = os.Getenv("GOROOT_FINAL")
    85  
    86  	var buf string
    87  	buf, _ = os.Getwd()
    88  	if buf == "" {
    89  		buf = "/???"
    90  	}
    91  	buf = filepath.ToSlash(buf)
    92  	ctxt.Pathname = buf
    93  
    94  	ctxt.LineHist.GOROOT = ctxt.Goroot
    95  	ctxt.LineHist.GOROOT_FINAL = ctxt.Goroot_final
    96  	ctxt.LineHist.Dir = ctxt.Pathname
    97  
    98  	ctxt.Headtype = headtype(Getgoos())
    99  	if ctxt.Headtype < 0 {
   100  		log.Fatalf("unknown goos %s", Getgoos())
   101  	}
   102  
   103  	// On arm, record goarm.
   104  	if ctxt.Arch.Family == sys.ARM {
   105  		ctxt.Goarm = Getgoarm()
   106  	}
   107  
   108  	ctxt.Flag_optimize = true
   109  	ctxt.Framepointer_enabled = Framepointer_enabled(Getgoos(), arch.Name)
   110  	return ctxt
   111  }
   112  
   113  func Linklookup(ctxt *Link, name string, v int) *LSym {
   114  	s := ctxt.Hash[SymVer{name, v}]
   115  	if s != nil {
   116  		return s
   117  	}
   118  
   119  	s = &LSym{
   120  		Name:    name,
   121  		Type:    0,
   122  		Version: int16(v),
   123  		Size:    0,
   124  	}
   125  	ctxt.Hash[SymVer{name, v}] = s
   126  	return s
   127  }
   128  
   129  func Linksymfmt(s *LSym) string {
   130  	if s == nil {
   131  		return "<nil>"
   132  	}
   133  	return s.Name
   134  }