Abstract: A method for characterizing runtime behavior of a computer program executing in an execution environment comprising: generating a call stack runtime data structure for tracking methods currently active in an executing program thread, an active method on the call stack is represented by a frame; determining condition for sampling an executing program to determine current program behavior; and, upon determination of a sampling condition, the sampling including examining at least one frame in the call stack in response to evaluate context of one or more methods represented in the call stack, the at least one frame in the call stack providing context relating to an executing program's calling structure.

Abstract: A system and method for dynamically optimizing a code sequence of a program while executing in a computer system comprises: identifying one or more program yield points in an original code sequence at which a run-time representation of the original code sequence may be optimized in an executing program; generating a prologue of instructions for setting up program state associated with the original code sequence at a particular yield point; adding the prologue of instructions to an intermediate representation of the original code sequence code for generating a specialized code sequence; and, compiling the specialized code sequence with a compiler for generating a run-time representation of the specialized code sequence, the run-time representation being further optimized for execution on a target computer system.

Abstract: A method for implementing an object model for an object-oriented programming language. Also contemplated is a method whereby some object state is materialized directly in those objects deemed likely to use such a state, but is externalized for those objects deemed unlikely to use the state.