JPS6341950A - Branch instruction execution measurement controlling system - Google Patents

Abstract

PURPOSE:To prevent lowering of processing speed in branching by recording only instruction codes and row numbers of executed branch instruction successively when a load module is executed in a main storage device, comparing the result with a source program, and editing and outputting execution trace of program logic. CONSTITUTION:In the course of execution of a load module 1 in a main storage device 2, a main storage unit interrupting means 4 interrupts in the main storage device 2 only when the instruction is a branch instruction, and replaces the branch instruction code at that time with an interrupt instruction code. At the same time, the main storage device interrupting means writes the instruction code at that time and row number successively in a branch instruction execution trace storage area 3. When it is confirmed that data are recorded in the branch instruction execution trace storage area 3, the interrupt instruction code in the main storage device 2 is replaced again with original branch instruction code.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an instruction tracing method in an information processing system, and more particularly to execution measurement control of branch instructions.

(Prior Art) Conventionally, in this type of technology, when a load module is executed, an interrupt is sent to the main memory every time all of its instructions are executed, and the instruction address, instruction code, and
A method for collecting and recording data addresses has been realized.

However, each time only a branch instruction is executed, an interrupt, instruction code and line number are collected and recorded, and these instruction codes and line numbers are compared with the source program, which is the original form of the load module, to trace the execution of the program logic. A method for editing and outputting was not realized.

(Problems to be Solved by the Invention) The conventional instruction tracing method described above interrupts the main memory every time every instruction is executed when a load module is executed, and collects and records various data. This has the drawback that the execution speed of the program receiving the interrupt is approximately 100 times slower (by the central processing unit) than when the program is not interrupted.

An object of the present invention is to interrupt the main memory when a load module is executed only in response to a branch instruction, collect and record the instruction code and line number at that point, and record the instruction code and line number. A branch instruction execution measurement system that eliminates the above drawbacks by comparing the code with the source program, which is the original form of the load module, and editing and outputting the execution trace of the program logic, thereby preventing a decrease in processing speed at branches. The objective is to provide a control method.

(Means for Solving the Problems) The branch instruction execution measurement control method according to the present invention is configured to include main memory interrupt means and program execution trace editing means.

The main memory interrupt means generates an interrupt in the main memory only when a branch instruction is executed to the main memory used to execute the load module, and collects the instruction code and line number at the time the interrupt occurs. This is for recording the information.

The program execution trace editing means is for editing and outputting the execution trace of the program logic by comparing the instruction code and line number with the original source program of the load module.

(Actual flow side) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a branch instruction execution measurement control method according to the present invention.

In FIG. 1, this embodiment includes a load module 1, a main memory 2, a branch instruction execution trace storage area 3 inside the TL device fR2, a memory device interrupt means 4, and a goki tape device 5. , a source program 6, a program execution trace editing means 7, and a printer device i8.

During the process of execution in the main memory 2 of the load module 1, the main memory interrupt means 4 interrupts the main memory 2 only when the instruction is a branch instruction, and replaces the branch instruction code at that time with an interrupt instruction code. . At the same time, the main memory interrupt means sequentially writes the current instruction code and line number into the branch instruction execution trace storage area 3. When it is confirmed that the data has been recorded in the branch instruction execution trace storage area 3, the interrupt instruction code inside the main memory f12 is
Back to the original branch instruction code! Can be replaced.

The above situation will be specifically explained with reference to FIG.

FIG. 2(a) shows the first load module being executed inside the main storage device fi12. −
As an example, the first branch instruction exists at the 100th line, and the second branch instruction exists at the 230th line.

FIG. 2(b) shows that when the execution of the first load module reaches the 100th line, the main memory interrupt means 4 interrupts the main memory 2 and sends the first branch instruction code to the first interrupt. It shows how the instruction code is replaced.

As a result, the 100th line of the line number and the first branch instruction code are recorded in the branch instruction execution trace storage area 3 inside the main storage device 2.

FIG. 2(C) shows that after it is confirmed that the 100th line of the line number and the first branch instruction code have been recorded in the branch instruction execution trace storage area 3, the first interrupt instruction code is written again. This shows how the branch instruction code is returned to 1.

As a result, line number 100 of the first load module is executed, and the process moves to the next line number to be executed.

FIG. 2(d) shows how sequentially executed line numbers and branch instruction codes are recorded in the branch instruction execution trace storage area 3 as a result of the first load module being executed thereafter. ing.

Through the above process, the recorded set of branch instruction code and line number is stored in the program execution trace editing means 7 as the source program 6, which is the original form of the first load module, and the result is printed on the printer. It is output to device 8.

(Effects of the Invention) As explained above, the present invention sequentially records only the instruction code and line number of the branch instruction to be executed when the load module is executed inside the main TII device, and By comparing the program logic with the source program, it is possible to measure how the program logic is being executed and which logic is frequently used while executing the load module.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the branch instruction execution measurement control method according to the present invention. FIGS. 2(a) to 2(d) are explanatory diagrams showing the operation of the main memory interrupt means for the main memory and the branch instruction execution trace storage area, respectively. 1...Load module 2...Main storage device 3.
... Branch instruction execution trace storage area 4 ... Main memory interrupt means 5 ... Magnetic tape device 6 ... Source program 7 ... Program execution trace editing means 8 ... Printer device

Claims (1)

[Claims] Generates an interrupt in the main memory only when a branch instruction is executed to the main memory used to execute the load module, and collects and records the instruction code and line number at the time of occurrence of the interrupt. main memory interrupt means;
The present invention is characterized by comprising a program execution trace editing means for comparing the instruction code and the line number with a source program that is an original form of the load module, and editing and outputting an execution trace of program logic. Branch instruction execution measurement control method.