JPS6039253A - Program test device - Google Patents

Abstract

PURPOSE:To detect accurately a cause of an abnormality with simple constitution and to attain ease of program test by designating a range of addresses where an error is generated and its data range. CONSTITUTION:The range of addresses generating an abnormality is set to an address setting circuit 5 of a program test device and a permissible upper limit value and lower limit value of data registers 3a-3n of a computer 1 are set to a comparison data range setting circuit 6. The value of a counter 2 is read by the 1st register circuit 7 at each write instruction to the registers 3a-3n in synchronizing with the updating of the program counter 2 of the computer 1, and the value of the registers 3a-3n being the range of the address set by the circuit 5 is read in the 2nd register circuit 8 synchonizingly. The contents of the circuit 8 and the permissible value set to the circuit 6 are compared by a comparator circuit 6. The contents of the counter 2 stored in the circuit 7 and the contents of the registers 3a-3n stored in the circuit 8 are displayed on a display circuit 10 depending on the result of comparison of the circuit 9 to ease of the program test.

Description

[Detailed description of the invention] The present invention relates to a program testing device.

In programs, various failures often occur due to the occurrence of unexpected information in memory. Therefore, it is important to know where the abnormal content was written and the cause thereof. Conventionally, a trace function that outputs the execution result every time a program instruction is executed, or a snapshot dump function that outputs the execution result when an instruction at a specific address is executed, etc., were incorporated into the program and used. There is a drawback that it is not possible to know with certainty when the intended data changes. Additionally, changes may be required to the program under test.

The present invention eliminates such drawbacks and provides a hardware-based program testing device that can easily and reliably determine the cause of an abnormality by specifying the range of addresses where the abnormality occurs and the range of its data. It is something.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention.
) is the microprogrammed computer loaded with the program to be tested, +2+ is the program counter in the computer, (5a), (5b)... (3 is the data 1 register in the computer, (4) is The address register in the computer (5) is an address setting circuit for setting the address range of the memory in the computer to be referenced.
6) is a comparison data range setting circuit for setting the range of comparison data values, and (7) is a register circuit for reading and holding the contents of the program counter.

(8) is a data register (3a) in the computer that corresponds to the address range set by the address setting circuit (5).
.

(6b)...A register circuit that stores the contents of (3,,), (9) is a data register (5a), (5b)...
・A comparison circuit that checks whether the contents of 6→ are within the range set by the comparison data setting circuit.QQ is a display circuit that displays the contents of the program counter and data register.

(11a), (11b) are registers indicating the allowable upper limit value and allowable lower limit value of the comparison data range; (12a), (1
2b)...(12 cells are data registers (3a), (5
b)...1゜ which is a register that holds the contents of G→ In such a configuration, first, the address setting circuit (5)
A range of addresses in which an abnormality has occurred is set, and a comparison data range setting circuit (6) sets the permissible upper and lower limits of the contents of the memory in the range of addresses. On the other hand, the value of the program counter (2) is read from the calculator (1) by the first register circuit (7) for each write instruction to the memory in synchronization with the update of the program counter (12) of the hand counter (1). data registers ea), (5) indicating the contents of the address range set by the address setting circuit (5);
b)...(3→) is read in the registers (12a), (12b)...(12) by the second register circuit (8) in synchronization with the reading of the program counter.

And (12a), (12b)... (each value of December and the above comparison).

Register (11a) indicating the allowable upper limit value set by the data range setting circuit (6) and register 01 indicating the allowable lower limit value
and the comparison circuit (9). If register (12
a).

(121))...(12rf) Each value is in the register (
11a) or smaller than the contents of the register (11b), the program counter (21) held in the first register circuit (7) and the second Register circuit (8)
Data register (5a) held by (!+b
)...The contents of (6n) are displayed through the display circuit σ0.

In addition, in the microprogrammed computer (1), the microprogram writes the contents of the address + (n-1) from the address indicated by the address register (4) to the data register (5a) for each write instruction to the memory.
(5b)...(3n) are always stored.

As described above, according to the present invention, when the value of the specified memory in the computer becomes an abnormal value outside the predetermined range, especially when the program at a random address is destroyed, it is difficult to determine which program was used to write the data. can be easily known and is effective when testing programs.

[Brief explanation of the drawing]

Figure 9 is a block diagram showing an embodiment of the program test device according to the present invention.
1 is a program counter in the computer (5a). (6b)...6 Data register in the Uma calculator, (4
) is the address register in the computer, and (5) is the address setting circuit. (6) is a comparison data range setting circuit, (7) is a first register circuit, (8) is a second register circuit, and (9) is a comparison circuit. Q (I is a display circuit, (11a) (1l b) are registers, (12a), (12b)... (12n) are registers.

Claims (1)

[Claims:] An address setting circuit for setting an address range to retrieve contents in a memory in a computer. Means for reading and storing the contents of the memory in the computer set by the address setting circuit and the program counter in the computer for each write command to the memory, and a permissible upper limit value for checking the read contents of the memory; A program comprising: a comparison data range setting circuit for setting a permissible lower limit value; and a comparison circuit for comparing whether the read contents of the memory satisfy the range of the permissible upper limit value and the permissible lower limit value according to the setting. Test equipment.