1 files changed, 49 insertions, 0 deletions
diff --git a/src/cmd/oldlink/internal/ld/typelink.go b/src/cmd/oldlink/internal/ld/typelink.go
new file mode 100644
index 0000000000..07d04bb13d
--- /dev/null
+++ b/src/cmd/oldlink/internal/ld/typelink.go
@@ -0,0 +1,49 @@
+// 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/oldlink/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
+	}
+}