Java card system rubbish recovering method
A recycling method and garbage technology, applied in the field of smart cards, can solve the problems that ordinary SIM cards do not have application downloads, system garbage occupies storage space, and restricts business development.
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[0017] In order to clearly describe the Java Card system garbage collection method of the present invention, the hardware structure of the trace collector is introduced at first.
[0018] The Java card involved in the present invention includes a trace collector, which completes two processes of object traversal and object clearing. In the object traversal phase, the trace collector scans from the root set and recursively determines reachable objects along each link on the entire object graph. Reachable objects encountered during the trace process use an independent bitmap to set a flag that if an object is not reachable from one (at least one) of these root objects, it is garbage collected. The principle and process of object traversal will be described in detail below.
[0019] The Java stack is used in the above object traversal process, see figure 1 discloses a space management method of the Java stack involved in the present invention: the bottom layer of the Java stack...
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