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runtime: mark arenaIdx.l1 and arenaIdx.l2 methods as nosplit

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Mark the "l1" and "l2" methods on "arenaIdx" with //go:nosplit, since
these methods are called from a nosplit context (for example, from
"spanOf").

Fixes .
Updates .

Change-Id: I48c7aa756b59a13162c89ef21066f83371ae50f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/441859
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Than McIntosh
2022-10-10 13:49:54 -04:00
parent 4a459cbbad
commit 506e690a26
1 changed files with 12 additions and 0 deletions

12
src/runtime/mheap.go

@ -576,6 +576,12 @@ func arenaBase(i arenaIdx) uintptr {
type arenaIdx uint type arenaIdx uint
// l1 returns the "l1" portion of an arenaIdx.
//
// Marked nosplit because it's called by spanOf and other nosplit
// functions.
//
//go:nosplit
func (i arenaIdx) l1() uint { func (i arenaIdx) l1() uint {
if arenaL1Bits == 0 { if arenaL1Bits == 0 {
// Let the compiler optimize this away if there's no // Let the compiler optimize this away if there's no
@ -586,6 +592,12 @@ func (i arenaIdx) l1() uint {
} }
} }
// l2 returns the "l2" portion of an arenaIdx.
//
// Marked nosplit because it's called by spanOf and other nosplit funcs.
// functions.
//
//go:nosplit
func (i arenaIdx) l2() uint { func (i arenaIdx) l2() uint {
if arenaL1Bits == 0 { if arenaL1Bits == 0 {
return uint(i) return uint(i)