Elbrus International Limited

Andrew V Yakushev

Boris A Babaian

Sergey A Rozhkov

Roman A Khvatov

Sergey Y Petrovsky

Vladimir M Gushchin

Precise exceptions handling in the optimized binary translated code is achieved by transitioning execution to the non-optimized step-by-step foreign code execution means in accordance with one of the several coherent foreign states designated during the optimized translation of the foreign code. A method to improve the operation by avoiding complete foreign state updates in the optimized code, an apparatus to track the switching between the states and a method to recompute the complete foreign state in accordance to the current state identification, execution context and additional documentation provided during the translation time are proposed.

Method and apparatus for preserving precise exceptions in binary translated code

The present invention increases efficiency of a binary translation process by correlating selected foreign code to previously translated binary host code. This approach eliminates repetitive translation of foreign code when the foreign code is executed on a host computer system. During the translation process, a database of translated foreign code is populated and thereafter a software layer checks for correspondence between the foreign code and binary code stored in the database. If the database contains corresponding code, that code is transferred to system memory for execution and there is no need to retranslate the foreign code. Minimizing the time spent translating the foreign code results in improved execution speed on the host computer system. The software layer creates an index into the database by hashing the foreign code or by using the storage location of the foreign code. By way of example, the sector of a disk drive where the foreign code is stored determines the index into the database.

Growing community of inventors

Sergiev Posad, Russia

Andrew V Yakushev