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cmd/compile: seed rand with time when race enabled

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When the race detector is enabled,
the compiler randomizes the order in which functions are compiled,
in an attempt to shake out bugs.
But we never re-seed the rand source, so every execution is identical.
Fix that to get more coverage.

Change-Id: If5cdde03ef4f1bab5f45e07f03fb6614945481d7
Reviewed-on: https://go-review.googlesource.com/43572
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-05-17 08:29:18 -07:00
parent 7555a45dc2
commit ff262913fe
1 changed files with 7 additions and 0 deletions
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7
src/cmd/compile/internal/gc/pgen.go
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@ -16,6 +16,7 @@ import (
"math/rand"
"sort"
"sync"
"time"
)
// "Portable" code generation.
@ -249,6 +250,12 @@ func compileSSA(fn *Node, worker int) {
pp.Free()
}
func init() {
if raceEnabled {
rand.Seed(time.Now().UnixNano())
}
}
// compileFunctions compiles all functions in compilequeue.
// It fans out nBackendWorkers to do the work
// and waits for them to complete.