cmd/link: move all FUNCDATA refs into go.func.*

This change moves all symbols referred to by FUNCDATA
into go.func.* and go.funcrel.*.

Surprisingly (because it inhibits some content-addressability),
it shrinks binaries by a little bit, about 0.1%.

This paves the way for a subsequent change to change
FUNCDATA relocations to offsets.

Change-Id: I70e487205073699f442192b0791cc92da5663057
Reviewed-on: https://go-review.googlesource.com/c/go/+/352189
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/src/cmd/internal/obj/objfile.go b/src/cmd/internal/obj/objfile.go
index 0f3356f85e..687cddc70c 100644
--- a/src/cmd/internal/obj/objfile.go
+++ b/src/cmd/internal/obj/objfile.go
@@ -408,7 +408,21 @@ func contentHashSection(s *LSym) byte {
 	name := s.Name
 	if s.IsPcdata() {
 		return 'P'
-	} else if strings.HasPrefix(name, "type.") {
+	}
+	if strings.HasPrefix(name, "runtime.gcbits.") {
+		return 'G' // gcbits
+	}
+	if strings.HasPrefix(name, "gcargs.") ||
+		strings.HasPrefix(name, "gclocals.") ||
+		strings.HasPrefix(name, "gclocals·") ||
+		strings.HasSuffix(name, ".opendefer") ||
+		strings.HasSuffix(name, ".arginfo0") ||
+		strings.HasSuffix(name, ".arginfo1") ||
+		strings.HasSuffix(name, ".args_stackmap") ||
+		strings.HasSuffix(name, ".stkobj") {
+		return 'F' // go.func.* or go.funcrel.*
+	}
+	if strings.HasPrefix(name, "type.") {
 		return 'T'
 	}
 	return 0