SOFTWARE DEBUG METHOD

PURPOSE:To execute the one line trace at a high speed, and also, to continuously execute the target program by determining whether an exceptional processing is generated or not by referring to an initialized condition, when a trap instruction is fetched at the time of executing the target program. CONSTITUTION:When a trap instruction inserted into a delimiter of a logical description of a source program at a generation stage of a target program is fetched at the time of executing a target program, an exceptional processing is generated under the prescribed condition, and by this fact, the one line trace can be executed at a high speed. In this case, whether the exceptional processing is generated or not is determined, based on the initialized condition. That is, even in the case the trap instruction is fetched, and the generation of the exceptional processing is obstructed in accordance with the contents of the initialized condition, and the target program can be executed continuously. In such a way, the software debug time can be shortened.