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// 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"
"cmd/link/internal/sym"
"sort"
)
type byTypeStr []typelinkSortKey
type typelinkSortKey struct {
TypeStr string
Type *sym.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(ctxt.Arch, s), s})
}
}
sort.Sort(typelinks)
tl := ctxt.Syms.Lookup("runtime.typelink", 0)
tl.Type = sym.STYPELINK
tl.Attr |= sym.AttrReachable | sym.AttrLocal
tl.Size = int64(4 * len(typelinks))
tl.P = make([]byte, tl.Size)
tl.R = make([]sym.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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