Mapping a stack in a stack machine environment

Details Mapping a stack in a stack machine environment Mapping a stack in a stack machine environment

G - Physics

06

F

G06F 9/45 (2006.01) G06F 9/40 (2006.01) G06F 12/02 (2006.01) G06F 12/08 (2006.01)

Patent

CA 2241865

The stack mapper of the present invention seeks to determine the shape of the stack at a given program counter. This is accomplished by locating all start points possible for a given method, that is, at all of the entry points for the method and all of the exception entry points, and trying to find a path from the beginning of the method to the program counter in question. The mapper first tries to locate a linear path from the beginning of the method, and then iteratively processes the sequence of bytes at each branch until the destination program counter is reached. Once the path is found, a simulation is run of the stack through that path, which is used as the virtual stack for the purposes of the garbage collector.

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