cmd/compile,cmd/asm: dump sym ABI versions for -S=2

When -S=2 is in effect for the compiler/assembler, include symbol ABI
values for defined symbols and relocations. This is intended to help
make it easier to distinguish between a symbol and its ABI wrapper.

Change-Id: Ifbf71372392075f15363b40e882b2132406b7d6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255718
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>

src/cmd/internal/obj/objfile.go

diff --git a/src/cmd/internal/obj/objfile.go b/src/cmd/internal/obj/objfile.go
index 7bc4f49..aede5fe 100644
--- a/src/cmd/internal/obj/objfile.go
+++ b/src/cmd/internal/obj/objfile.go
@@ -663,7 +663,11 @@
 }
 
 func (ctxt *Link) writeSymDebugNamed(s *LSym, name string) {
-	fmt.Fprintf(ctxt.Bso, "%s ", name)
+	ver := ""
+	if ctxt.Debugasm > 1 {
+		ver = fmt.Sprintf("<%d>", s.ABI())
+	}
+	fmt.Fprintf(ctxt.Bso, "%s%s ", name, ver)
 	if s.Type != 0 {
 		fmt.Fprintf(ctxt.Bso, "%v ", s.Type)
 	}
@@ -726,15 +730,19 @@
 	sort.Sort(relocByOff(s.R)) // generate stable output
 	for _, r := range s.R {
 		name := ""
+		ver := ""
 		if r.Sym != nil {
 			name = r.Sym.Name
+			if ctxt.Debugasm > 1 {
+				ver = fmt.Sprintf("<%d>", s.ABI())
+			}
 		} else if r.Type == objabi.R_TLS_LE {
 			name = "TLS"
 		}
 		if ctxt.Arch.InFamily(sys.ARM, sys.PPC64) {
-			fmt.Fprintf(ctxt.Bso, "\trel %d+%d t=%d %s+%x\n", int(r.Off), r.Siz, r.Type, name, uint64(r.Add))
+			fmt.Fprintf(ctxt.Bso, "\trel %d+%d t=%d %s%s+%x\n", int(r.Off), r.Siz, r.Type, name, ver, uint64(r.Add))
 		} else {
-			fmt.Fprintf(ctxt.Bso, "\trel %d+%d t=%d %s+%d\n", int(r.Off), r.Siz, r.Type, name, r.Add)
+			fmt.Fprintf(ctxt.Bso, "\trel %d+%d t=%d %s%s+%d\n", int(r.Off), r.Siz, r.Type, name, ver, r.Add)
 		}
 	}
 }