mirror
/
go
mirror of https://github.com/golang/go.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

cmd/compile: always use StackMapDontCare as register map index when reg map is not used 

When go115ReduceLiveness is true (so we don't emit actual
register maps), use StackMapDontCare consistently for the
register map index, so RegMapValid is always false.

This fixes a compiler crash when doing -live=2 debug print.

Fixes #39251.

Change-Id: Ice087af491fa69c413f8ee59f923b72d592c0643
Reviewed-on: https://go-review.googlesource.com/c/go/+/235418
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Cherry Zhang 2020-05-27 11:37:00 -04:00
parent 0d20a49282
commit 6bf2eea62a
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/compile/internal/gc/plive.go
View File

@ -1249,7 +1249,7 @@ func (lv *Liveness) compact(b *ssa.Block) {
if go115ReduceLiveness {
hasStackMap := lv.hasStackMap(v)
isUnsafePoint := lv.allUnsafe || lv.unsafePoints.Get(int32(v.ID))
idx := LivenessIndex{StackMapDontCare, 0, isUnsafePoint}
idx := LivenessIndex{StackMapDontCare, StackMapDontCare, isUnsafePoint}
if hasStackMap {
idx.stackMapIndex = lv.stackMapSet.add(lv.livevars[pos].vars)
pos++