// This is the shared initialization code. It sets up the basic pointers,
// and allows enough extra space for a filler object. We call a virtual
// method, "lab_is_valid()" to handle the different asserts the old/young
// labs require.
void PSPromotionLAB::initialize(MemRegion lab) {
assert(lab_is_valid(lab), "Sanity");
HeapWord* bottom = lab.start();
HeapWord* end = lab.end();
set_bottom(bottom);
set_end(end);
set_top(bottom);
// We can be initialized to a zero size!
if (free() > 0) {
if (ZapUnusedHeapArea) {
debug_only(Memory::set_words(top(), free()/HeapWordSize, badHeapWord));
}
// NOTE! We need to allow space for a filler object.
assert(lab.word_size() >= filler_header_size, "lab is too small");
end = end - filler_header_size;
set_end(end);
_state = needs_flush;
} else {
_state = zero_size;
}
assert(this->top() <= this->end(), "pointers out of order");
}
// This is the shared initialization code. It sets up the basic pointers,
// and allows enough extra space for a filler object. We call a virtual
// method, "lab_is_valid()" to handle the different asserts the old/young
// labs require.
void PSPromotionLAB::initialize(MemRegion lab) {
assert(lab_is_valid(lab), "Sanity");
HeapWord* bottom = lab.start();
HeapWord* end = lab.end();
set_bottom(bottom);
set_end(end);
set_top(bottom);
// Initialize after VM starts up because header_size depends on compressed
// oops.
filler_header_size = align_object_size(typeArrayOopDesc::header_size(T_INT));
// We can be initialized to a zero size!
if (free() > 0) {
if (ZapUnusedHeapArea) {
debug_only(Copy::fill_to_words(top(), free()/HeapWordSize, badHeapWord));
}
// NOTE! We need to allow space for a filler object.
assert(lab.word_size() >= filler_header_size, "lab is too small");
end = end - filler_header_size;
set_end(end);
_state = needs_flush;
} else {
_state = zero_size;
}
assert(this->top() <= this->end(), "pointers out of order");
}