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cmd/compile/internal/gc: treat cap/len as safe in mayAffectMemory

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OLEN and OCAP can't affect memory state as long as their
arguments don't.

Re-organized case bodies to avoid duplicating same branches for
recursive invocations.

Change-Id: I30407143429f7dd1891badb70df88969ed267535
Reviewed-on: https://go-review.googlesource.com/133555
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Iskander Sharipov 2018-09-05 18:49:52 +03:00
parent 930ce09ca3
commit 2d82465d18
1 changed files with 8 additions and 10 deletions
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18
src/cmd/compile/internal/gc/esc.go
View File

@ -689,18 +689,16 @@ func (e *EscState) mayAffectMemory(n *Node) bool {
switch n.Op {
case ONAME, OCLOSUREVAR, OLITERAL:
return false
case ODOT, ODOTPTR:
return e.mayAffectMemory(n.Left)
case OIND, OCONVNOP:
return e.mayAffectMemory(n.Left)
case OCONV:
return e.mayAffectMemory(n.Left)
case OINDEX:
// Left+Right group.
case OINDEX, OADD, OSUB, OOR, OXOR, OMUL, OLSH, ORSH, OAND, OANDNOT, ODIV, OMOD:
return e.mayAffectMemory(n.Left) || e.mayAffectMemory(n.Right)
case OADD, OSUB, OOR, OXOR, OMUL, OLSH, ORSH, OAND, OANDNOT, ODIV, OMOD:
return e.mayAffectMemory(n.Left) || e.mayAffectMemory(n.Right)
case ONOT, OCOM, OPLUS, OMINUS, OALIGNOF, OOFFSETOF, OSIZEOF:
// Left group.
case ODOT, ODOTPTR, OIND, OCONVNOP, OCONV, OLEN, OCAP,
ONOT, OCOM, OPLUS, OMINUS, OALIGNOF, OOFFSETOF, OSIZEOF:
return e.mayAffectMemory(n.Left)
default:
return true
}