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// Test nursery string allocation and pretenuring.
gczeal(0);
gcparam("minNurseryBytes", 4096 * 1024);
gcparam("maxNurseryBytes", 4096 * 1024);
gc();
// String allocation in the nursery is initially enabled.
assertEq(nurseryStringsEnabled(), true);
// Literal strings are atoms (which are always tenured).
assertEq(isNurseryAllocated("foo"), false);
// The result of Number.toString is nursery allocated.
assertEq(isNurseryAllocated((1234).toString()), true);
// Ropes are nursery allocated.
let s = "bar";
assertEq(isNurseryAllocated("foo" + s), true);
// Dependent strings are nursery allocated.
assertEq(isNurseryAllocated("foobar".substr(1)), true);
// The testing function 'newString' allows control over which heap is used.
assertEq(isNurseryAllocated(newString("foobar", { tenured: true })), false);
assertEq(isNurseryAllocated(newString("foobar", { tenured: false })), true);
// Allocating lots of strings which survive nursery collection disables
// allocating strings in the nursery.
let a = [];
for (let i = 1; i < 500000; i++) {
a.push(i.toString());
}
gc();
assertEq(nurseryStringsEnabled(), false);
a = undefined;
// When a large number of tenured strings die very soon after allocation,
// pretenuring for that zone is reset and nursery allocation enabled again.
gc();
assertEq(nurseryStringsEnabled(), false);
let initGCNumber = gcparam('majorGCNumber');
while (!nurseryStringsEnabled() && gcparam('majorGCNumber') < initGCNumber + 3) {
for (let i = 1; i < 100000; i++) {
a = i.toString();
}
}
assertEq(nurseryStringsEnabled(), true);
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