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cmd/compile: pass types on SSA Store/Move/Zero ops

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For SSA Store/Move/Zero ops, attach the type of the value being
stored to the op as the Aux field. This type will be used for
write barrier insertion (in a followup CL). Since SSA passes
do not accurately propagate types of values (because of type
casting), we can't simply use type of the store's arguments
for write barrier insertion.

Passes "toolstash -cmp" on std.

Updates #17583.

Change-Id: I051d5e5c482931640d1d7d879b2a6bb91f2e0056
Reviewed-on: https://go-review.googlesource.com/36838
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Cherry Zhang 2017-02-09 09:46:44 -05:00
parent 77b09b8b8d
commit 211c8c9f1a
14 changed files with 217 additions and 97 deletions
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5
src/cmd/compile/internal/ssa/writebarrier.go
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@ -159,7 +159,10 @@ func writebarrier(f *Func) {
var val *Value
ptr := w.Args[0]
siz := w.AuxInt
typ := w.Aux // only non-nil for MoveWB, ZeroWB
var typ interface{}
if w.Op != OpStoreWB {
typ = &ExternSymbol{Typ: f.Config.fe.TypeUintptr(), Sym: w.Aux.(Type).Symbol()}
}
pos = w.Pos
var op Op