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cmd/compile: fix some plive comments

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The liveness analysis no longer directly emits PCDATA. Fix stale
comments that say so.

Change-Id: Id26b112ddf4c13a12ebf766f64bf57c68fbfe3ef
Reviewed-on: https://go-review.googlesource.com/67691
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Austin Clements 2017-10-02 17:29:10 -04:00 committed by Matthew Dempsky
parent e130dcf051
commit 85f93c889a
1 changed files with 3 additions and 2 deletions
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5
src/cmd/compile/internal/gc/plive.go
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@ -692,7 +692,7 @@ func (lv *Liveness) epilogue() {
for _, b := range lv.f.Blocks { for _, b := range lv.f.Blocks {
be := lv.blockEffects(b) be := lv.blockEffects(b)
// walk backward, emit pcdata and populate the maps // walk backward, construct maps at each safe point
index := int32(be.lastbitmapindex) index := int32(be.lastbitmapindex)
if index < 0 { if index < 0 {
// the first block we encounter should have the ATEXT so // the first block we encounter should have the ATEXT so
@ -1012,7 +1012,8 @@ Outer:
} }
lv.livevars = lv.livevars[:uniq] lv.livevars = lv.livevars[:uniq]
// Rewrite PCDATA instructions to use new numbering. // Record compacted stack map indexes for each value.
// These will later become PCDATA instructions.
lv.showlive(nil, lv.livevars[0]) lv.showlive(nil, lv.livevars[0])
pos := 1 pos := 1
lv.stackMapIndex = make(map[*ssa.Value]int) lv.stackMapIndex = make(map[*ssa.Value]int)