Compiling apparatus and a compiling method

A compiling apparatus for compiling a source program in a data processing apparatus, comprising:

• a front end transforming a source program into intermediate representations;
• optimizing means for optimizing the intermediate representations from the front end in accordance with predetermined optimization functions;
• at least one intermediate representation changing means for further transferring the optimized intermediate representations from the optimizing means in accordance with predetermined optimization functions, the at least one intermediate representation changing means including final intermediate representation changing means;
• code output means for providing code according to the intermediate representations obtained by the optimization from the file in intermediate representation changing means;
• and
• optimizing structure determination means for determining a number of repetitions required for optimization by the optimizing means and intermediate representation changing means, and selecting the optimization functions for directing an optimizing process performed in each of the repetitions, and thereby the intermediate representations being changed and optimized.

A compiling method in a data processing apparatus comprising steps of:

• a step for providing intermediate representations described by an intermediate language according to a source program;
• an optimizing structure determination step for determining the number of repetitions of an optimization phase to execute optimization of the intermediate language and selecting optimization functions to direct an optimizing process carried out in each of the optimization phases;
• an optimizing step for optimizing the intermediate representations provided by the source program and the intermediate representations in each of the optimization phases, according to the determination by the optimizing structure determination step;
• an intermediate representation changing step for further transforming the optimized intermediate representation in each of the optimization phases, according to the determination by the optimizing structure determination step;
• a determination step for determining the number of repetitions of an optimization phase;
• and
• a code output step for providing codes according to the finally obtained intermediate representations.