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Source file src/cmd/internal/obj/sym.go

Documentation: cmd/internal/obj

  // 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 obj
  
  import (
  	"cmd/internal/objabi"
  	"fmt"
  	"log"
  	"math"
  )
  
  func Linknew(arch *LinkArch) *Link {
  	ctxt := new(Link)
  	ctxt.hash = make(map[string]*LSym)
  	ctxt.statichash = make(map[string]*LSym)
  	ctxt.Arch = arch
  	ctxt.Pathname = objabi.WorkingDir()
  
  	ctxt.Headtype.Set(objabi.GOOS)
  	if ctxt.Headtype < 0 {
  		log.Fatalf("unknown goos %s", objabi.GOOS)
  	}
  
  	ctxt.Flag_optimize = true
  	ctxt.Framepointer_enabled = objabi.Framepointer_enabled(objabi.GOOS, arch.Name)
  	return ctxt
  }
  
  // LookupDerived looks up or creates the symbol with name name derived from symbol s.
  // The resulting symbol will be static iff s is.
  func (ctxt *Link) LookupDerived(s *LSym, name string) *LSym {
  	if s.Static() {
  		return ctxt.LookupStatic(name)
  	}
  	return ctxt.Lookup(name)
  }
  
  // LookupStatic looks up the static symbol with name name.
  // If it does not exist, it creates it.
  func (ctxt *Link) LookupStatic(name string) *LSym {
  	s := ctxt.statichash[name]
  	if s == nil {
  		s = &LSym{Name: name, Attribute: AttrStatic}
  		ctxt.statichash[name] = s
  	}
  	return s
  }
  
  // Lookup looks up the symbol with name name.
  // If it does not exist, it creates it.
  func (ctxt *Link) Lookup(name string) *LSym {
  	return ctxt.LookupInit(name, nil)
  }
  
  // LookupInit looks up the symbol with name name.
  // If it does not exist, it creates it and
  // passes it to init for one-time initialization.
  func (ctxt *Link) LookupInit(name string, init func(s *LSym)) *LSym {
  	ctxt.hashmu.Lock()
  	s := ctxt.hash[name]
  	if s == nil {
  		s = &LSym{Name: name}
  		ctxt.hash[name] = s
  		if init != nil {
  			init(s)
  		}
  	}
  	ctxt.hashmu.Unlock()
  	return s
  }
  
  func (ctxt *Link) Float32Sym(f float32) *LSym {
  	i := math.Float32bits(f)
  	name := fmt.Sprintf("$f32.%08x", i)
  	return ctxt.LookupInit(name, func(s *LSym) {
  		s.Size = 4
  		s.Set(AttrLocal, true)
  	})
  }
  
  func (ctxt *Link) Float64Sym(f float64) *LSym {
  	i := math.Float64bits(f)
  	name := fmt.Sprintf("$f64.%016x", i)
  	return ctxt.LookupInit(name, func(s *LSym) {
  		s.Size = 8
  		s.Set(AttrLocal, true)
  	})
  }
  
  func (ctxt *Link) Int64Sym(i int64) *LSym {
  	name := fmt.Sprintf("$i64.%016x", uint64(i))
  	return ctxt.LookupInit(name, func(s *LSym) {
  		s.Size = 8
  		s.Set(AttrLocal, true)
  	})
  }
  

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