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      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 (a] 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 (a] 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 ld
     33 
     34 import (
     35 	"cmd/internal/obj"
     36 	"fmt"
     37 	"io/ioutil"
     38 	"os"
     39 	"path"
     40 	"strconv"
     41 	"strings"
     42 )
     43 
     44 func addlib(ctxt *Link, src string, obj string, pathname string) {
     45 	name := path.Clean(pathname)
     46 
     47 	// runtime.a -> runtime, runtime.6 -> runtime
     48 	pkg := name
     49 	if len(pkg) >= 2 && pkg[len(pkg)-2] == '.' {
     50 		pkg = pkg[:len(pkg)-2]
     51 	}
     52 
     53 	// already loaded?
     54 	for i := 0; i < len(ctxt.Library); i++ {
     55 		if ctxt.Library[i].Pkg == pkg {
     56 			return
     57 		}
     58 	}
     59 
     60 	var pname string
     61 	isshlib := false
     62 	if (ctxt.Windows == 0 && strings.HasPrefix(name, "/")) || (ctxt.Windows != 0 && len(name) >= 2 && name[1] == ':') {
     63 		pname = name
     64 	} else {
     65 		// try dot, -L "libdir", and then goroot.
     66 		for _, dir := range ctxt.Libdir {
     67 			if Linkshared {
     68 				pname = dir + "/" + pkg + ".shlibname"
     69 				if _, err := os.Stat(pname); err == nil {
     70 					isshlib = true
     71 					break
     72 				}
     73 			}
     74 			pname = dir + "/" + name
     75 			if _, err := os.Stat(pname); err == nil {
     76 				break
     77 			}
     78 		}
     79 	}
     80 
     81 	pname = path.Clean(pname)
     82 
     83 	if ctxt.Debugvlog > 1 && ctxt.Bso != nil {
     84 		fmt.Fprintf(ctxt.Bso, "%5.2f addlib: %s %s pulls in %s isshlib %v\n", elapsed(), obj, src, pname, isshlib)
     85 	}
     86 
     87 	if isshlib {
     88 		addlibpath(ctxt, src, obj, "", pkg, pname)
     89 	} else {
     90 		addlibpath(ctxt, src, obj, pname, pkg, "")
     91 	}
     92 }
     93 
     94 /*
     95  * add library to library list.
     96  *	srcref: src file referring to package
     97  *	objref: object file referring to package
     98  *	file: object file, e.g., /home/rsc/go/pkg/container/vector.a
     99  *	pkg: package import path, e.g. container/vector
    100  */
    101 func addlibpath(ctxt *Link, srcref string, objref string, file string, pkg string, shlibnamefile string) {
    102 	for i := 0; i < len(ctxt.Library); i++ {
    103 		if pkg == ctxt.Library[i].Pkg {
    104 			return
    105 		}
    106 	}
    107 
    108 	if ctxt.Debugvlog > 1 && ctxt.Bso != nil {
    109 		fmt.Fprintf(ctxt.Bso, "%5.2f addlibpath: srcref: %s objref: %s file: %s pkg: %s shlibnamefile: %s\n", obj.Cputime(), srcref, objref, file, pkg, shlibnamefile)
    110 	}
    111 
    112 	ctxt.Library = append(ctxt.Library, &Library{})
    113 	l := ctxt.Library[len(ctxt.Library)-1]
    114 	l.Objref = objref
    115 	l.Srcref = srcref
    116 	l.File = file
    117 	l.Pkg = pkg
    118 	if shlibnamefile != "" {
    119 		shlibbytes, err := ioutil.ReadFile(shlibnamefile)
    120 		if err != nil {
    121 			Diag("cannot read %s: %v", shlibnamefile, err)
    122 		}
    123 		l.Shlib = strings.TrimSpace(string(shlibbytes))
    124 	}
    125 }
    126 
    127 func atolwhex(s string) int64 {
    128 	n, _ := strconv.ParseInt(s, 0, 64)
    129 	return n
    130 }
    131