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cmd/compile: ignore contentEscapes for marking nodes as escaping

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We can still stack allocate and VarKill nodes which don't
escape but their content does.

Fixes #16996

Change-Id: If8aa0fcf2c327b4cb880a3d5af8d213289e6f6bf
Reviewed-on: https://go-review.googlesource.com/28575
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Keith Randall 2016-09-06 14:48:47 -07:00
parent a6edffb286
commit 923a74ce77
3 changed files with 19 additions and 1 deletions
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2
src/cmd/compile/internal/gc/esc.go
View file

@ -1572,7 +1572,7 @@ func esccall(e *EscState, n *Node, up *Node) {
}
if haspointers(t.Type) {
if escassignfromtag(e, note, nE.Escretval, src) == EscNone && up.Op != ODEFER && up.Op != OPROC {
if escassignfromtag(e, note, nE.Escretval, src)&EscMask == EscNone && up.Op != ODEFER && up.Op != OPROC {
a := src
for a.Op == OCONVNOP {
a = a.Left

10
test/live.go
View file

@ -643,3 +643,13 @@ func good40() {
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ ret$"
_ = t
}
func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
ddd2(x, y) // ERROR "live at call to ddd2: autotmp_[0-9]+$"
printnl() // nothing live here. See issue 16996.
}
func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
sink = a[0]
}
var sink *int

8
test/live_ssa.go
View file

@ -646,3 +646,11 @@ func good40() {
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ ret$"
_ = t
}
func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
ddd2(x, y) // ERROR "live at call to ddd2: autotmp_[0-9]+$"
printnl() // nothing live here. See issue 16996.
}
func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
sink = a[0]
}