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cmd/compile: don't generate race calls for zero-sized values

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One example of a heavily-used zero-size value is encoding/binary.BigEndian.

Change-Id: I8e873c447e154ab2ca61b7315df774693891270c
Reviewed-on: https://go-review.googlesource.com/59330
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-05-02 11:02:53 -07:00
parent 99da8730b0
commit b046878018
1 changed files with 9 additions and 12 deletions
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21
src/cmd/compile/internal/gc/racewalk.go
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@ -462,6 +462,15 @@ func callinstr(np **Node, init *Nodes, wr int, skip int) bool {
return false
}
t := n.Type
// dowidth may not have been called for PEXTERN.
dowidth(t)
w := t.Width
if w == BADWIDTH {
Fatalf("instrument: %v badwidth", t)
}
if w == 0 {
return false // can't race on zero-sized things
}
if isartificial(n) {
return false
}
@ -494,24 +503,12 @@ func callinstr(np **Node, init *Nodes, wr int, skip int) bool {
if wr != 0 {
name = "msanwrite"
}
// dowidth may not have been called for PEXTERN.
dowidth(t)
w := t.Width
if w == BADWIDTH {
Fatalf("instrument: %v badwidth", t)
}
f = mkcall(name, nil, init, uintptraddr(n), nodintconst(w))
} else if flag_race && (t.IsStruct() || t.IsArray()) {
name := "racereadrange"
if wr != 0 {
name = "racewriterange"
}
// dowidth may not have been called for PEXTERN.
dowidth(t)
w := t.Width
if w == BADWIDTH {
Fatalf("instrument: %v badwidth", t)
}
f = mkcall(name, nil, init, uintptraddr(n), nodintconst(w))
} else if flag_race {
name := "raceread"