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cmd/compile: add global autogeneratedPos

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We use an "autogenerated" position in several places.
Rather than recreate it each time, make one early on and reuse it.
This removes the creation of new positions during the backend,
which was not concurrency-safe.

Updates #15756

Change-Id: Ic116b2e60f0e99de1a2ea87fe763831b50b645f8
Reviewed-on: https://go-review.googlesource.com/38915
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-03-28 13:52:14 -07:00
parent b28f2f7399
commit 3431d9113c
5 changed files with 8 additions and 6 deletions
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2
src/cmd/compile/internal/gc/main.go
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@ -351,6 +351,8 @@ func Main(archInit func(*Arch)) {
dclcontext = PEXTERN
nerrors = 0
autogeneratedPos = makePos(src.NewFileBase("<autogenerated>", "<autogenerated>"), 1, 0)
timings.Start("fe", "loadsys")
loadsys()