static void
random_init(JSRuntime *rt)
{
int64 tmp, tmp2;
/* Do at most once. */
if (rt->rngInitialized)
return;
rt->rngInitialized = JS_TRUE;
/* rt->rngMultiplier = 0x5DEECE66DL */
JSLL_ISHL(tmp, 0x5, 32);
JSLL_UI2L(tmp2, 0xDEECE66DL);
JSLL_OR(rt->rngMultiplier, tmp, tmp2);
/* rt->rngAddend = 0xBL */
JSLL_I2L(rt->rngAddend, 0xBL);
/* rt->rngMask = (1L << 48) - 1 */
JSLL_I2L(tmp, 1);
JSLL_SHL(tmp2, tmp, 48);
JSLL_SUB(rt->rngMask, tmp2, tmp);
/* rt->rngDscale = (jsdouble)(1L << 53) */
JSLL_SHL(tmp2, tmp, 53);
JSLL_L2D(rt->rngDscale, tmp2);
/* Finally, set the seed from current time. */
random_setSeed(rt, PRMJ_Now());
}
void
js_InitRandom(JSContext *cx)
{
/*
* Set the seed from current time. Since we have a RNG per context and we often bring
* up several contexts at the same time, we xor in some additional values, namely
* the context and its successor. We don't just use the context because it might be
* possible to reverse engineer the context pointer if one guesses the time right.
*/
random_setSeed(cx,
(PRMJ_Now() / 1000) ^
int64(cx) ^
int64(cx->link.next));
}
void
js_InitRandom(JSThreadData *data)
{
/* Finally, set the seed from current time. */
random_setSeed(data, PRMJ_Now() / 1000);
}
void ExecutableAllocator::initSeed()
{
random_setSeed(&rngSeed, (PRMJ_Now() / 1000) ^ int64_t(this));
}
