Importance

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Abstract

To detect only JITed frames which are frames for codes compiled by a Java Just In Time compiler (JIT compiler) in an environment in which the memory available for use by a Java JIT compiler is limited, and JITed frames and other frames coexist in a thread stack. When the JIT compiler causes short of memory in a specific thread, all the threads are temporarily suspended. Then, each thread is searched for active methods, i.e., in each thread stack JITed code addresses are searched for. When there is no JITed last frame records, each frame is scanned from the position pointed by the current stack pointer SP to the bottom of the stack. When there is a list, it is scanned from the position pointed by the current stack pointer SP to the address of a JITed frame pointed by the latest JITed last frame record in the list. Following this, a frame pointed by a JITed last frame record and a JITed frame that can be traced from the pointed frame are detected. In FIG. 6, a stack area above the JITed frame of JITed code E (an area from the SP to a frame with the label E) is a frame of non-JITed code called from a point at which it is determined that a JITed last frame record will not be formed, or a frame of an exception handler that handles a Java exception mapped to a CPU exception.

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