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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "util/RandomSeed.h"
#include "mozilla/Array.h"
#include "mozilla/Maybe.h"
#include "mozilla/RandomNum.h"
#include <stdint.h>
#include "vm/Time.h"
uint64_t js::GenerateRandomSeed() {
mozilla::Maybe<uint64_t> maybeSeed = mozilla::RandomUint64();
return maybeSeed.valueOrFrom([] {
// Use PRMJ_Now() in case we couldn't read random bits from the OS.
uint64_t timestamp = PRMJ_Now();
return timestamp ^ (timestamp << 32);
});
}
void js::GenerateXorShift128PlusSeed(mozilla::Array<uint64_t, 2>& seed) {
// XorShift128PlusRNG must be initialized with a non-zero seed.
do {
seed[0] = GenerateRandomSeed();
seed[1] = GenerateRandomSeed();
} while (seed[0] == 0 && seed[1] == 0);
}