From ec8caf696ae44b9ea4624025a613dad4301398c4 Mon Sep 17 00:00:00 2001
From: Jan Ziak <0xe2.0x9a.0x9b@gmail.com>
Date: Thu, 21 Mar 2013 19:00:02 +0100
Subject: [PATCH] runtime: mark strings without going through an intermediate
 buffer

R=rsc
CC=golang-dev
https://golang.org/cl/7949043
---
 src/pkg/runtime/mgc0.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/pkg/runtime/mgc0.c b/src/pkg/runtime/mgc0.c
index dd268fcda0..aa499f4762 100644
--- a/src/pkg/runtime/mgc0.c
+++ b/src/pkg/runtime/mgc0.c
@@ -740,8 +740,9 @@ scanblock(Workbuf *wbuf, Obj *wp, uintptr nobj, bool keepworking)
 
 		case GC_STRING:
 			obj = *(void**)(stack_top.b + pc[1]);
+			markonly(obj);
 			pc += 2;
-			break;
+			continue;
 
 		case GC_EFACE:
 			eface = (Eface*)(stack_top.b + pc[1]);
@@ -804,9 +805,9 @@ scanblock(Workbuf *wbuf, Obj *wp, uintptr nobj, bool keepworking)
 			break;
 
 		case GC_DEFAULT_PTR:
-			while((i = stack_top.b) <= end_b) {
+			while(stack_top.b <= end_b) {
+				obj = *(byte**)stack_top.b;
 				stack_top.b += PtrSize;
-				obj = *(byte**)i;
 				if(obj >= arena_start && obj < arena_used) {
 					*ptrbufpos++ = (PtrTarget){obj, 0};
 					if(ptrbufpos == ptrbuf_end)
-- 
2.50.0