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

Documentation: cmd/link/internal/ld

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package ld
  
  import (
  	"cmd/internal/objabi"
  	"sort"
  )
  
  type byTypeStr []typelinkSortKey
  
  type typelinkSortKey struct {
  	TypeStr string
  	Type    *Symbol
  }
  
  func (s byTypeStr) Less(i, j int) bool { return s[i].TypeStr < s[j].TypeStr }
  func (s byTypeStr) Len() int           { return len(s) }
  func (s byTypeStr) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
  
  // typelink generates the typelink table which is used by reflect.typelinks().
  // Types that should be added to the typelinks table are marked with the
  // MakeTypelink attribute by the compiler.
  func (ctxt *Link) typelink() {
  	typelinks := byTypeStr{}
  	for _, s := range ctxt.Syms.Allsym {
  		if s.Attr.Reachable() && s.Attr.MakeTypelink() {
  			typelinks = append(typelinks, typelinkSortKey{decodetypeStr(s), s})
  		}
  	}
  	sort.Sort(typelinks)
  
  	tl := ctxt.Syms.Lookup("runtime.typelink", 0)
  	tl.Type = STYPELINK
  	tl.Attr |= AttrReachable | AttrLocal
  	tl.Size = int64(4 * len(typelinks))
  	tl.P = make([]byte, tl.Size)
  	tl.R = make([]Reloc, len(typelinks))
  	for i, s := range typelinks {
  		r := &tl.R[i]
  		r.Sym = s.Type
  		r.Off = int32(i * 4)
  		r.Siz = 4
  		r.Type = objabi.R_ADDROFF
  	}
  }
  

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