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Shrink stacks on force compact #1813

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Shrink stacks on force compact #1813

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7f00f11
WIP trying out multicast
erikcorry Sep 13, 2023
bb8ce7c
Only shrink stacks when forcing a compaction.
erikcorry Sep 18, 2023
fae8fad
Remove inadvertent
erikcorry Sep 18, 2023
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4 changes: 3 additions & 1 deletion src/third_party/dartino/mark_sweep.h
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,8 @@ class MarkingVisitor : public RootCallback {
for (Object** p = start; p < end; p++) mark_pointer(*p);
}

bool shrink_stacks() const override { return true; }
bool shrink_stacks() const override { return shrink_stacks_; }
void set_shrink_stacks(bool value) { shrink_stacks_ = value; }

private:
void INLINE mark_pointer(Object* object) {
Expand All @@ -72,6 +73,7 @@ class MarkingVisitor : public RootCallback {
uword new_space_address_;
uword new_space_size_;
MarkingStack* marking_stack_;
bool shrink_stacks_ = false;
};

class FixPointersVisitor : public RootCallback {
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3 changes: 3 additions & 0 deletions src/third_party/dartino/two_space_heap.cc
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Expand Up @@ -364,6 +364,9 @@ bool TwoSpaceHeap::perform_garbage_collection(bool force_compact) {
SemiSpace* semi_space = new_space();
MarkingStack stack(program_);
MarkingVisitor marking_visitor(semi_space, &stack);
if (force_compact || Flags::shrink_stacks_a_lot) {
marking_visitor.set_shrink_stacks(true);
}

process_heap_->iterate_roots(&marking_visitor);

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3 changes: 3 additions & 0 deletions src/third_party/dartino/two_space_heap.h
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Expand Up @@ -167,6 +167,9 @@ class ScavengeVisitor : public RootCallback {

void set_record_new_space_pointers(uint8* p) { record_ = p; }

// We inherit shrink_stacks(), which by default returns false, so
// we don't shrink stacks during scavenge.

private:
template <class SomeSpace>
static inline HeapObject* clone_into_space(Program* program, HeapObject* original, SomeSpace* to);
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