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

Documentation: cmd/link/internal/ld

  // Derived from Inferno utils/6l/l.h and related files.
  // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/l.h
  //
  //	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
  
  type Symbols struct {
  	symbolBatch []Symbol
  
  	// Symbol lookup based on name and indexed by version.
  	hash []map[string]*Symbol
  
  	Allsym []*Symbol
  }
  
  func (syms *Symbols) newsym(name string, v int) *Symbol {
  	batch := syms.symbolBatch
  	if len(batch) == 0 {
  		batch = make([]Symbol, 1000)
  	}
  	s := &batch[0]
  	syms.symbolBatch = batch[1:]
  
  	s.Dynid = -1
  	s.Plt = -1
  	s.Got = -1
  	s.Name = name
  	s.Version = int16(v)
  	syms.Allsym = append(syms.Allsym, s)
  
  	return s
  }
  
  // Look up the symbol with the given name and version, creating the
  // symbol if it is not found.
  func (syms *Symbols) Lookup(name string, v int) *Symbol {
  	m := syms.hash[v]
  	s := m[name]
  	if s != nil {
  		return s
  	}
  	s = syms.newsym(name, v)
  	s.Extname = s.Name
  	m[name] = s
  	return s
  }
  
  // Look up the symbol with the given name and version, returning nil
  // if it is not found.
  func (syms *Symbols) ROLookup(name string, v int) *Symbol {
  	return syms.hash[v][name]
  }
  
  // Allocate a new version (i.e. symbol namespace).
  func (syms *Symbols) IncVersion() int {
  	syms.hash = append(syms.hash, make(map[string]*Symbol))
  	return len(syms.hash) - 1
  }
  

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