International Business Machines Corporation

Olivier P Thomann

Peter Wiebe Burka

Daniel J Heidinga

Karl Michael Taylor

T Mark W Bottomley

An illustrative embodiment for serialization of pre-initialized objects receives a source code definition of a class, identifies a set of constants associated with the class in the source code to form a set of identified constants, creates a result object corresponding to each constant in the set of identified constants, and compiles the source code into a compiled form of the class. The illustrative embodiment further serializes each result object into a resource file associated with the class to form a set of serialized objects and replaces, in the compiled form of the class, each reference to a respective constant associated with the class from the set of identified constants with a corresponding dynamic instruction using a respective serialized object in the set of serialized objects.

Serialization of pre-initialized objects

A source code file can be compiled to generate bytecode. During compilation, a first use of a local variable within a set of instructions of the source code can be detected. A local variable usage list can be examined for at least one inactive local variable in use by the set of instructions. An existence of an acceptable type pairing between a type descriptor corresponding to a local variable and a type descriptor of the local variable may be determined. When the acceptable type pairing exists, an index of the local variable array corresponding to the determined acceptable type pairing for the local variable can be reused. Otherwise, a new index can be assigned for the local variable. Compiling bytecode in this manner avoids extraneous class loads that would otherwise occur during a verification phase of the bytecode, which has still been optimized to reuse local variable slots.

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Gatineau, Canada

Olivier P Thomann