From e13f0c438590a7c78a955fec67fc966b82b2a947 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Sat, 2 Nov 2024 10:47:28 +0100
Subject: [PATCH] runtime: refactor GC mark phase into gcMarkReachable

This is a small refactor to prepare GC marking for multithreaded
stop-the-world.
---
 src/runtime/gc_blocks.go         | 3 +--
 src/runtime/gc_stack_portable.go | 5 +++++
 src/runtime/gc_stack_raw.go      | 5 +++++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/runtime/gc_blocks.go b/src/runtime/gc_blocks.go
index cbd401b9e1..24166aebba 100644
--- a/src/runtime/gc_blocks.go
+++ b/src/runtime/gc_blocks.go
@@ -422,8 +422,7 @@ func runGC() (freeBytes uintptr) {
 	}
 
 	// Mark phase: mark all reachable objects, recursively.
-	markStack()
-	findGlobals(markRoots)
+	gcMarkReachable()
 
 	if baremetal && hasScheduler {
 		// Channel operations in interrupts may move task pointers around while we are marking.
diff --git a/src/runtime/gc_stack_portable.go b/src/runtime/gc_stack_portable.go
index d35e16e30c..750a34ec2c 100644
--- a/src/runtime/gc_stack_portable.go
+++ b/src/runtime/gc_stack_portable.go
@@ -8,6 +8,11 @@ import (
 	"unsafe"
 )
 
+func gcMarkReachable() {
+	markStack()
+	findGlobals(markRoots)
+}
+
 //go:extern runtime.stackChainStart
 var stackChainStart *stackChainObject
 
diff --git a/src/runtime/gc_stack_raw.go b/src/runtime/gc_stack_raw.go
index 5ee18622db..d55522a9f6 100644
--- a/src/runtime/gc_stack_raw.go
+++ b/src/runtime/gc_stack_raw.go
@@ -4,6 +4,11 @@ package runtime
 
 import "internal/task"
 
+func gcMarkReachable() {
+	markStack()
+	findGlobals(markRoots)
+}
+
 // markStack marks all root pointers found on the stack.
 //
 // This implementation is conservative and relies on the stack top (provided by