Compiler, program product, compilation device, communication terminal device, and compilation method

A program stored on a computer-readable recording medium for causing a compiler to perform a method of converting a source program into an object program, the method comprising:

• a multi-nested structure detection procedure for detecting a multi-nested structure having a unit loop inside another unit loop, and included in the source program;
• a return destination address detection procedure for detecting return destination addresses indicating initial addresses of destinations to which a processing returns in accordance with a final command in each unit loop constituting the multi-nested structure returns;
• an address overlap determination procedure for determining whether or not overlapping return destination addresses sharing the same address are present among the return destination addresses detected during the return destination address detection procedure;
• and
• a dividing procedure which, when the address overlap determination procedure determines the presence of the overlapping return destination addresses, converts the source program into an object program, serving as the object program, in which said overlapping return destination addresses differ from each other.

A compiler stored on a computer-readable recording medium for causing a computer to convert a source program into an object program, the compiler comprising:

• a multi-nested structure detection means for detecting a multi-nested structure having a unit loop inside another unit loop, and included in the source program;
• a return destination address detection means for detecting return destination addresses indicating initial addresses of destinations to which a processing returns in accordance with a final command in each unit loop constituting the multi-nested structure returns;
• an address overlap determination means for determining whether or not overlapping return destination addresses sharing the same address are present among the return destination addresses detected by said return destination address detection means;
• and
• a dividing means which, when said address overlap determination means determines the presence of the overlapping return destination addresses, converts the source program into an object program, serving as the object program, in which the overlapping return destination addresses differ from each other.

A communication terminal device comprising:

• a compilation device for converting a source program into an object program, comprising:
• a multi-nested structure detection means for detecting a multi-nested structure having a unit loop inside another unit loop, and included in the source program;
• a return destination address detection means for detecting return destination addresses indicating initial addresses of destinations to which a processing returns in accordance with a final command in each unit loop constituting said multi-nested structure returns;
• an address overlap determination means for determining whether or not overlapping return destination addresses sharing the same address are present among the return destination addresses detected by said return destination address detection means;
• and
• a dividing means which, when said address overlap determination means determines the presence of the overlapping return destination addresses, converts the source program into an object program, serving as the object program, in which the overlapping return destination addresses differ from each other;
• a communication means for obtaining via a transmission medium a source program to be compiled by said compilation device;
• and
• an execution control means for executing an object program generated by said compilation device.

A compilation method in which a computer converts a source program into an object program, comprising the steps of:

• detecting a multi-nested structure having a unit loop inside another unit loop, and included in the source program;
• detecting a return destination address indicating initial addresses of destinations to which a processing returns in accordance with a final command in each unit loop constituting the multi-nested structure returns;
• determining whether or not overlapping return destination addresses sharing the same address are present among the return destination addresses detected during the return destination address detection step;
• and
• when the presence of the overlapping return destination addresses is determined in the address overlap determination, converting the source program into an object program, serving as the object program, in which the overlapping return destination addresses are divided so as to differ from each other.