Abstract: This invention makes debugging more efficient when an object program is intended for processing a loop made up of n groups of iteration-forming instructions. Instructions in the secondary assembler program each has a combination of a line number “;lx” and an iteration identifier “;ix” attached thereto. The line number “;lx” specifies a source code from which the instruction is generated, and the iteration identifier “;ix” specifies an iteration to which the instruction belongs. When the user sets a breakpoint at an instruction, displayed in the windows are (a) a source code for generating the instruction at the breakpoint and (b) another source code for generating another instruction that belongs to a different group of iteration-forming instructions than the breakpoint instruction.

Abstract: According to the present invention, a compiler generates, as debugging information on variables appearing in a source program and the allocation of hardware resources, location information made up of elements showing, for each entry of a variable, an address range within which the variable is valid, a condition flag which is made true within the address range when the variable is valid, and a resource allocated to the variable. A debugging device analyzes the debugging information and stores it. When examining the value of a variable, an entry for the valid variable is determined from the address currently being executed and the value held in the condition flag register, and the resource allocated to that variable is obtained. In this way, the contents of the variable can be referenced correctly.

Abstract: This invention makes debugging more efficient when an object program is intended for processing a loop made up of n groups of iteration-forming instructions. Instructions in the secondary assembler program each has a combination of a line number “;lx” and an iteration identifier “;ix” attached thereto. The line number “;lx” specifies a source code from which the instruction is generated, and the iteration identifier “;ix” specifies an iteration to which the instruction belongs. When the user sets a breakpoint at an instruction, displayed in the windows are (a) a source code for generating the instruction at the breakpoint and (b) another source code for generating another instruction that belongs to a different group of iteration-forming instructions than the breakpoint instruction.

Abstract: In an architecture having conditional instructions, when a block to be executed if a given condition is true and a block to be executed if the condition is false are structured through if-conversion optimization as a signal basic block in an assembler program by a compiler, in the prior art it has not been possible to establish a correct correspondence between variables and resources when the program is run on a debugging device, resulting in an inability to correctly respond to a user request to display the contents of a variable. According to the present invention, a compiler generates, as debugging information on variables appearing in a source program and the allocation of hardware resources, location information made up of elements showing, for each entry of a variable, an address range within which the variable is valid, a condition flag which is made true within the address range when the variable is valid, and a resource allocated to the variable.