Temporal garbage collector with indirection cells

Details Temporal garbage collector with indirection cells Temporal garbage collector with indirection cells

1987-04-30

1989-02-21

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 1212, G06F 1208

Patent

active

048071200

ABSTRACT:
A garbage collection system for digital computers classifies memory objects into generations. Objects in older generations which need to reference younger generations must do so indirectly through indirection cells located in the older generation. Thus, all pointers into a generation come from younger generations or indirection cells. When a generation is collected, the indirection cells in that generation are defined to be oldspace and collected in the usual manner. Indirection cells of older generations which can point to the generation being collected are processed by a scavenger.
The system also includes read and write barriers which function to filter out undesirable pointers based on the classification and volatility of memory regions to which they point or are destined to be stored.

REFERENCES:
patent: 4121286 (1978-10-01), Venton et al.
patent: 4660130 (1987-04-01), Bartley et al.
patent: 4695949 (1987-09-01), Thatte et al.
patent: 4757438 (1988-07-01), Thatte et al.
patent: 4758944 (1988-07-01), Bartley et al.
Lieberman and Hewitt, "A Real-Time Garbage Collector Based on the Lifetimes of Objects", 6/83, ACM vol. 26, No. 6, pp. 419-429.

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