Recording tracking method for object memory status based on equivalence class in real-time Java virtual machine

Abstract

The invention provides a recording tracking method for object memory statuses based on equivalence class in a real-time Java virtual machine. The method comprises: for each method operating on the Java virtual machine, recording all equivalence classes in the methods in an equivalence class linked list, each object in the methods being included in a certain equivalence class, memory objects representing memory information being included in the equivalence classes; the structure of each equivalence class in the linked list comprising equivalence classes IDs, memory equivalence classes Tags, an object assembly, object member variables, and equivalence class memory statuses, the memory equivalence classes Tags identifying whether the equivalence class is the memory information equivalence class, the equivalence class memory statuses storing the memory regions where the equivalence classes are in; and using the equivalence class linked list to track object memory statuses. The method can record all possible memory statuses of all objects in program, and make preparations for subsequent optimization operation of the real-time virtual machine, for example, elimination of object reference inspection, thereby improving real-time performance.

Description

technical field [0001] The invention belongs to the technical field of Java computer applications, in particular to a method for recording and tracking object memory states based on equivalence classes in a real-time Java virtual machine. Background technique [0002] In the Java real-time specification (RealTimeSpecificationforJava, RTSJ), in order to avoid the impact of the memory garbage collector (GarbageCollector, GC) on real-time performance, RTSJ extends the standard Java heap to define the immortal memory area and scope memory area that are not controlled by GC ; At the same time, in order to avoid the occurrence of dangling references, RTSJ defines the reference rules of objects in different memory areas, and the Java virtual machine will check the correctness of the reference rules for each object assignment statement at runtime. The introduction of object reference rules increases the difficulty of developing real-time Java programs; and the runtime object referen...

AI Technical Summary

Problems solved by technology

The introduction of object reference rules increases the difficulty of developing real-time Java programs; and the runtime object reference check affects the real-time performance of the system to a certain extent

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