A garbage collector collects a generation of a collected heap in accordance with the train algorithm. It employs remembered sets associated with respective car sections to keep track of references into the associated car sections. Each remembered set contains entries that identify respective regions in the generation that contain references into the associated car section. When the collector collects a car section, it reclaims the car section's objects for which there are no references, looking only in regions that the car section's remembered set specifies. Additionally, the collector treats the generation as divided into segments, for each of which it maintains a farthest-forward-car value that identifies which, among the car sections into which the respective segment contains a reference, is closest to collection. When the collector looks for references in a region that the remembered set specifies, it searches only that region's segments whose farthest-forward-car values identify car sections in the remembered set.
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