92 lines
3 KiB
C++
92 lines
3 KiB
C++
/** @file DX1CollectorIterator.cpp
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*
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* @author Roland Conybeare, Dec 2025
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**/
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#include "gc/DX1CollectorIterator.hpp"
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#include "gc/DX1Collector.hpp"
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#include <xo/indentlog/scope.hpp>
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#include <xo/indentlog/print/tag.hpp>
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namespace xo {
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namespace mm {
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DX1CollectorIterator::DX1CollectorIterator(const DX1Collector * gc,
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generation gen_ix,
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generation gen_hi,
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DArenaIterator arena_ix,
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DArenaIterator arena_hi) : gc_{gc},
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gen_ix_{gen_ix},
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gen_hi_{gen_hi},
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arena_ix_{arena_ix},
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arena_hi_{arena_hi}
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{
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this->normalize();
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}
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void
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DX1CollectorIterator::normalize() noexcept
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{
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/* normalize: find lowest generation with non-empty to-space */
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for (; gen_ix_ < gen_hi_; ++gen_ix_) {
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const DArena * arena
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= gc_->get_space(role::to_space(), gen_ix_);
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arena_ix_ = arena->begin();
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arena_hi_ = arena->end();
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if (arena_ix_ != arena_hi_) {
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// normalization achieved!
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break;
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}
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}
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}
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AllocInfo
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DX1CollectorIterator::deref() const noexcept
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{
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return arena_ix_.deref();
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}
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cmpresult
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DX1CollectorIterator::compare(const DX1CollectorIterator & other_ix) const noexcept
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{
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scope log(XO_DEBUG(false),
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xtag("is_valid", is_valid()),
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xtag("other_ix.is_valid", other_ix.is_valid()) );
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if (is_invalid() || (gc_ != other_ix.gc_)) {
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log && log("incomparable!");
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return cmpresult::incomparable();
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}
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if (gen_ix_ != other_ix.gen_ix_) {
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log && log(xtag("gen", gen_ix_), xtag("other.gen", other_ix.gen_ix_));
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/* same collector, different arenas -> compare based on gen# */
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return cmpresult::from_cmp(gen_ix_, other_ix.gen_ix_);
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}
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/* both iterators refer to the same arena,
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* so can compare their arena iterators directly
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*/
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cmpresult retval = arena_ix_.compare(other_ix.arena_ix_);
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log && log(xtag("retval", retval));
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return retval;
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}
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void
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DX1CollectorIterator::next() noexcept
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{
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if (arena_ix_ != arena_hi_) {
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++arena_ix_;
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this->normalize();
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}
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}
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} /*namespace mm*/
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} /*namespace xo*/
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/* end DX1CollectorIterator.cpp */
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