Fujitsu Corporation

Mikayo Wada

Mitsuo Sakurai

Richard A Lethin

Joseph A Bank, Iii

Shigenori Koyata

Charles D Garrett

An optimizing object code translation system and method perform dynamic compilation and translation of a target object code on a source operating system while performing optimization. Compilation and optimization of the target code is dynamically executed in real time. A compiler performs analysis and optimizations that improve emulation relative to template-based translation and interpretation such that a host processor which processes larger order instructions, such as 32-bit instructions, may emulate a target processor which processes smaller order instructions, such as 16-bit and 8-bit instructions. The optimizing object code translator does not require knowledge of a static program flow graph or memory locations of target instructions prior to run time. In addition, the optimizing object code translator does not require knowledge of the location of all join points into the target object code prior to execution. During program execution, a translator records branch operations. The logging of information identifies instructions and instruction join points. When a number of times a branch operation is executed exceeds a threshold, the destination of the branch becomes a seed for compilation and code portions between seeds are defined as segments. A segment may be incomplete allowing for modification or replacement to account for a new flow of program control during real time program execution.

Dynamic optimizing object code translator for architecture emulation and dynamic optimizing object code translation method

The present invention introduces an object conversion apparatus with both advantages of the dynamic object conversion and advantages of the static object conversion. In the object conversion apparatus, an application program to be converted is divided into some blocks, and a page table is provided in order to specify whether each block is processed by the dynamic object conversion or the static object conversion. Based on the information specified in the page table, an instruction in the block used with high frequency is processed with the dynamic object conversion, and an instruction in the block used with low frequency is processed with the static object conversion.

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Kawasaki, Japan

Mikayo Wada