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Mini Shell
Mini Shell
// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/span.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/goobj"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"strconv"
"strings"
)
func (ctxt *Link) readImportCfg(file string) {
ctxt.PackageFile = make(map[string]string)
ctxt.PackageShlib = make(map[string]string)
data, err := ioutil.ReadFile(file)
if err != nil {
log.Fatalf("-importcfg: %v", err)
}
for lineNum, line := range strings.Split(string(data), "\n") {
lineNum++ // 1-based
line = strings.TrimSpace(line)
if line == "" {
continue
}
if line == "" || strings.HasPrefix(line, "#") {
continue
}
var verb, args string
if i := strings.Index(line, " "); i < 0 {
verb = line
} else {
verb, args = line[:i], strings.TrimSpace(line[i+1:])
}
var before, after string
if i := strings.Index(args, "="); i >= 0 {
before, after = args[:i], args[i+1:]
}
switch verb {
default:
log.Fatalf("%s:%d: unknown directive %q", file, lineNum, verb)
case "packagefile":
if before == "" || after == "" {
log.Fatalf(`%s:%d: invalid packagefile: syntax is "packagefile path=filename"`, file, lineNum)
}
ctxt.PackageFile[before] = after
case "packageshlib":
if before == "" || after == "" {
log.Fatalf(`%s:%d: invalid packageshlib: syntax is "packageshlib path=filename"`, file, lineNum)
}
ctxt.PackageShlib[before] = after
}
}
}
func pkgname(ctxt *Link, lib string) string {
name := path.Clean(lib)
// When using importcfg, we have the final package name.
if ctxt.PackageFile != nil {
return name
}
// runtime.a -> runtime, runtime.6 -> runtime
pkg := name
if len(pkg) >= 2 && pkg[len(pkg)-2] == '.' {
pkg = pkg[:len(pkg)-2]
}
return pkg
}
func findlib(ctxt *Link, lib string) (string, bool) {
name := path.Clean(lib)
var pname string
isshlib := false
if ctxt.linkShared && ctxt.PackageShlib[name] != "" {
pname = ctxt.PackageShlib[name]
isshlib = true
} else if ctxt.PackageFile != nil {
pname = ctxt.PackageFile[name]
if pname == "" {
ctxt.Logf("cannot find package %s (using -importcfg)\n", name)
return "", false
}
} else {
if filepath.IsAbs(name) {
pname = name
} else {
pkg := pkgname(ctxt, lib)
// Add .a if needed; the new -importcfg modes
// do not put .a into the package name anymore.
// This only matters when people try to mix
// compiles using -importcfg with links not using -importcfg,
// such as when running quick things like
// 'go tool compile x.go && go tool link x.o'
// by hand against a standard library built using -importcfg.
if !strings.HasSuffix(name, ".a") && !strings.HasSuffix(name, ".o") {
name += ".a"
}
// try dot, -L "libdir", and then goroot.
for _, dir := range ctxt.Libdir {
if ctxt.linkShared {
pname = filepath.Join(dir, pkg+".shlibname")
if _, err := os.Stat(pname); err == nil {
isshlib = true
break
}
}
pname = filepath.Join(dir, name)
if _, err := os.Stat(pname); err == nil {
break
}
}
}
pname = filepath.Clean(pname)
}
return pname, isshlib
}
func addlib(ctxt *Link, src, obj, lib string, fingerprint goobj.FingerprintType) *sym.Library {
pkg := pkgname(ctxt, lib)
// already loaded?
if l := ctxt.LibraryByPkg[pkg]; l != nil && !l.Fingerprint.IsZero() {
// Normally, packages are loaded in dependency order, and if l != nil
// l is already loaded with the actual fingerprint. In shared build mode,
// however, packages may be added not in dependency order, and it is
// possible that l's fingerprint is not yet loaded -- exclude it in
// checking.
checkFingerprint(l, l.Fingerprint, src, fingerprint)
return l
}
pname, isshlib := findlib(ctxt, lib)
if ctxt.Debugvlog > 1 {
ctxt.Logf("addlib: %s %s pulls in %s isshlib %v\n", obj, src, pname, isshlib)
}
if isshlib {
return addlibpath(ctxt, src, obj, "", pkg, pname, fingerprint)
}
return addlibpath(ctxt, src, obj, pname, pkg, "", fingerprint)
}
/*
* add library to library list, return added library.
* srcref: src file referring to package
* objref: object file referring to package
* file: object file, e.g., /home/rsc/go/pkg/container/vector.a
* pkg: package import path, e.g. container/vector
* shlib: path to shared library, or .shlibname file holding path
* fingerprint: if not 0, expected fingerprint for import from srcref
* fingerprint is 0 if the library is not imported (e.g. main)
*/
func addlibpath(ctxt *Link, srcref, objref, file, pkg, shlib string, fingerprint goobj.FingerprintType) *sym.Library {
if l := ctxt.LibraryByPkg[pkg]; l != nil {
return l
}
if ctxt.Debugvlog > 1 {
ctxt.Logf("addlibpath: srcref: %s objref: %s file: %s pkg: %s shlib: %s fingerprint: %x\n", srcref, objref, file, pkg, shlib, fingerprint)
}
l := &sym.Library{}
ctxt.LibraryByPkg[pkg] = l
ctxt.Library = append(ctxt.Library, l)
l.Objref = objref
l.Srcref = srcref
l.File = file
l.Pkg = pkg
l.Fingerprint = fingerprint
if shlib != "" {
if strings.HasSuffix(shlib, ".shlibname") {
data, err := ioutil.ReadFile(shlib)
if err != nil {
Errorf(nil, "cannot read %s: %v", shlib, err)
}
shlib = strings.TrimSpace(string(data))
}
l.Shlib = shlib
}
return l
}
func atolwhex(s string) int64 {
n, _ := strconv.ParseInt(s, 0, 64)
return n
}
// PrepareAddmoduledata returns a symbol builder that target-specific
// code can use to build up the linker-generated go.link.addmoduledata
// function, along with the sym for runtime.addmoduledata itself. If
// this function is not needed (for example in cases where we're
// linking a module that contains the runtime) the returned builder
// will be nil.
func PrepareAddmoduledata(ctxt *Link) (*loader.SymbolBuilder, loader.Sym) {
if !ctxt.DynlinkingGo() {
return nil, 0
}
amd := ctxt.loader.LookupOrCreateSym("runtime.addmoduledata", 0)
if ctxt.loader.SymType(amd) == sym.STEXT && ctxt.BuildMode != BuildModePlugin {
// we're linking a module containing the runtime -> no need for
// an init function
return nil, 0
}
ctxt.loader.SetAttrReachable(amd, true)
// Create a new init func text symbol. Caller will populate this
// sym with arch-specific content.
ifs := ctxt.loader.LookupOrCreateSym("go.link.addmoduledata", 0)
initfunc := ctxt.loader.MakeSymbolUpdater(ifs)
ctxt.loader.SetAttrReachable(ifs, true)
ctxt.loader.SetAttrLocal(ifs, true)
initfunc.SetType(sym.STEXT)
// Add the init func and/or addmoduledata to Textp.
if ctxt.BuildMode == BuildModePlugin {
ctxt.Textp = append(ctxt.Textp, amd)
}
ctxt.Textp = append(ctxt.Textp, initfunc.Sym())
// Create an init array entry
amdi := ctxt.loader.LookupOrCreateSym("go.link.addmoduledatainit", 0)
initarray_entry := ctxt.loader.MakeSymbolUpdater(amdi)
ctxt.loader.SetAttrReachable(amdi, true)
ctxt.loader.SetAttrLocal(amdi, true)
initarray_entry.SetType(sym.SINITARR)
initarray_entry.AddAddr(ctxt.Arch, ifs)
return initfunc, amd
}
Zerion Mini Shell 1.0