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Source file src/cmd/link/internal/ld/ld.go

Documentation: cmd/link/internal/ld

  // Derived from Inferno utils/6l/obj.c and utils/6l/span.c
  // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/obj.c
  // https://bitbucket.org/inferno-os/inferno-os/src/default/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/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 = dir + "/" + pkg + ".shlibname"
  					if _, err := os.Stat(pname); err == nil {
  						isshlib = true
  						break
  					}
  				}
  				pname = dir + "/" + name
  				if _, err := os.Stat(pname); err == nil {
  					break
  				}
  			}
  		}
  		pname = path.Clean(pname)
  	}
  
  	return pname, isshlib
  }
  
  func addlib(ctxt *Link, src string, obj string, lib string) *sym.Library {
  	pkg := pkgname(ctxt, lib)
  
  	// already loaded?
  	if l := ctxt.LibraryByPkg[pkg]; l != nil {
  		return l
  	}
  
  	pname, isshlib := findlib(ctxt, lib)
  
  	if ctxt.Debugvlog > 1 {
  		ctxt.Logf("%5.2f addlib: %s %s pulls in %s isshlib %v\n", elapsed(), obj, src, pname, isshlib)
  	}
  
  	if isshlib {
  		return addlibpath(ctxt, src, obj, "", pkg, pname)
  	}
  	return addlibpath(ctxt, src, obj, pname, pkg, "")
  }
  
  /*
   * 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
   */
  func addlibpath(ctxt *Link, srcref string, objref string, file string, pkg string, shlib string) *sym.Library {
  	if l := ctxt.LibraryByPkg[pkg]; l != nil {
  		return l
  	}
  
  	if ctxt.Debugvlog > 1 {
  		ctxt.Logf("%5.2f addlibpath: srcref: %s objref: %s file: %s pkg: %s shlib: %s\n", Cputime(), srcref, objref, file, pkg, shlib)
  	}
  
  	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
  	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
  }
  

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