JP2923918B2 - Trace data search method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for searching trace data, and more particularly, to a system for monitoring the execution of a program in various control arithmetic devices, which is obtained by sequentially monitoring the program execution process. The present invention relates to a trace data search method for extracting predetermined processing data to be displayed on a display device.

[0002]

2. Description of the Related Art Generally, in order to know whether or not a program created for a control arithmetic unit represented by a computer, a controller or the like functions normally, at least the execution result of each instruction in the program must be determined. Are required to be displayed individually. For this reason, many conventional control arithmetic devices sequentially monitor the execution process of a program to collect trace data, and further process data included in the collected trace data into a CRT (cathode ray tube) in the system. ), Etc., a trace function for displaying on a display device is prepared in advance.

Hereinafter, details of an actual trace function by the control arithmetic unit will be described. FIG. 5 is a block diagram showing a general system configuration of a control arithmetic device having a trace function.

As shown in FIG. 1, a control arithmetic unit 1 such as a computer or a controller includes an arithmetic execution unit 11, a program memory 12, a program counter 13, a data memory 14, a trace memory 15, and a trace memory control unit. And a section 16. Further, in the system, a display device 2 such as a CRT is prepared in addition to the control operation device 1 configured as described above.

[0005] Among them, the operation execution unit 11 sequentially executes individual instructions of a program stored in the program memory 12, that is, a program created for the control operation device 1, one by one according to the addressing of the program counter 13. The calculation is executed, and the data memory 14 is used as a work area therefor. Simultaneously with the execution of the operation of each instruction of this program,
At this time, the address of the instruction being executed and the data resulting from the execution of the instruction are sequentially stored in the trace memory 15 as a processing address and processing data, respectively. Then, the trace memory control unit 16 sequentially outputs the processing addresses and the processing data sequentially stored in the trace memory 15 to the display device 2 as trace data, and on the display device 2, predetermined processing data is sequentially displayed. It has become so.

Hereinafter, an actual tracing by the control arithmetic unit 1 configured as described above will be described with reference to an example of a simple program. FIG. 6 shows FB (function
block) is a diagram illustrating an example of a source program written in the diagram. FIG. 7 is a diagram showing an example of an object program obtained by compiling the source program shown in FIG.

[0007] As shown in both figures, this series of programs includes three loop processes. That is, the three loop processes are indicated by “LOOP3” and “LOOPEND” in the source program of FIG. 6, and in the object program of FIG.
(L1, LD ACC, MEM1) at address 0002 and "LOOP L1, 3" at address 0005. In the figure, MEM1, MEM2 and ME
M3 represents a variable using the data memory 14,
ACC represents an accumulator in the system. Then, the control operation device 1 executes the object program of FIG. 7 as described above in order from the instruction at the address 0000 of the program memory address, and then executes the address of the instruction being executed and the execution of the operation of the instruction. The resulting data is sequentially stored in the trace memory 15 as a trace data string including a processing address and processing data.

Hereinafter, a state where the trace data string is stored in the trace memory 15 will be described. FIG. 8 is a diagram showing a state of the trace data string stored in the trace memory 15 in accordance with the execution of the operation of the object program shown in FIG.

As shown in FIG. 1, in the trace data string stored in the trace memory 15, a processing address and processing data are assigned to two words as a result of execution of an operation of one instruction. The combination of the address and the processing data is written in the order of execution of the operation of the object program in FIG. Further, in the trace memory 15, a trace start pointer indicating a start address and a trace end pointer indicating the end are set among individual storage addresses in which a processing address is written in a trace data string. Further, a trace data search pointer that is updated by +2 is set to search for individual trace data existing between the trace start pointer and the trace end pointer.

[0010] That is, according to the object program of FIG. 7, it includes three loop processes, and in practice, trace data for 13 instructions is stored in the trace memory 15.
, So the above trace start pointer is
1000H of storage address in trace memory 15
("H" indicates hexadecimal notation; the same applies hereinafter), and the trace end pointer is 1018H of the last thirteenth instruction. Then, based on the trace start pointer, the trace end pointer, and the trace data search pointer set as described above, the trace memory control unit 16 sequentially processes the individual processing addresses in the trace data sequence stored in the trace memory 15. Search and
The retrieved individual processing addresses and the corresponding individual processing data are sequentially output to the display device 2 so that the output individual processing data is sequentially displayed on the screen of the display device 2. Become.

Hereinafter, a state in which the processed data is displayed on the display device 2 will be described. FIG. 9 is a diagram illustrating a state where predetermined processing data in the trace data string illustrated in FIG. 8 is displayed on the screen of the display device 2.

As shown in FIG. 1, on the screen of the display device 2, the storage addresses 1001H, 1003H, 1011H, and 1003H stored in the trace memory 15 among the individual processing data included in the trace data string shown in FIG. 1013
H, 1015H, 1017H, and 1019H, which are the processing data written at the respective addresses “0”,
Only “3”, “6”, “3”, “9”, “9” and “9” are displayed at the corresponding locations.

Specifically, the display device 2 in the system includes:
The same program as the program created for the control operation device 1 is prepared, and the processing data sequentially output from the trace memory control unit 16 is displayed on the screen of the display device 2 by the program on the display device 2. They are sequentially displayed at corresponding locations (specific areas on the screen indicated by individual processing addresses in the program on the display device 2). However, the storage addresses 1005H, 1007H, 1009H, 100BH,
Since the processing data written in the respective addresses of 100DH and 100FH exists in the loop processing, the processing data on the screen is output in order from the trace memory control unit 16 to the display device 2 because the processing data exists in the loop processing. The location is overwritten and erased from the screen, and finally, in the area before and after the operator “+” shown in the figure, the storage addresses 1011H, 1013H, and 1010 in the trace memory 15 are stored.
The processing data written at each address of 15H, that is, “6”, “3”, and “9” of the processing data related to the last loop processing are displayed.

As a result, a trace function for individually displaying execution results of individual instructions of a program created for the control arithmetic unit 1 is realized, and it is possible to know whether or not the program functions normally. It becomes possible.

[0015]

By the way, in the above-described conventional trace data search method using the trace function, a loop process as exemplified in a program created for the control arithmetic unit 1 is included. Even in this case, the trace memory control unit 16
In order to output all trace data in the trace data string stored in the display device 2 to the display device 2, even the same processing data redundantly stored in the trace memory 15 in accordance with the loop processing is displayed on the screen of the display device 2. It is overwritten many times above. In this case, when many loop processes exist in the program, the amount of trace data output to the display device 2 inevitably increases,
As a result, the total output time of the processing data to the display device 2 becomes longer, and the time until the display of the predetermined processing data is completed is delayed.

Some of the control arithmetic units 1 have a condition match detection function for detecting that the value of the processing address in the trace data string stored in the trace memory 15 matches a preset expected value. In the trace data search method by the control arithmetic unit 1, similarly to the above-described method, the processing data in the loop processing in the program is sequentially deleted from the screen of the display device 2 by overwriting display, and the last loop processing is performed. Is displayed. For this reason, if there is a portion in the loop process in the program in which the matching of the condition is to be detected, the processing data relating to the processing of the loop in which the matching of the condition occurs is displayed on the screen of the display device 2 in a regular manner. Cannot be displayed on the screen.

The present invention has been made in view of such circumstances, and a first object of the present invention is to provide a display device with predetermined processing data even when many loop processes exist in a program. It is another object of the present invention to provide a trace data search method capable of completing display in a minimum amount of time. A second object is that there is a portion where a condition match should be detected in a loop process in a program. It is therefore an object of the present invention to provide a trace data search method capable of constantly displaying, on a display device, processing data relating to a loop processing in which the condition is met even when the condition is met.

[0018]

According to a first aspect of the present invention, each processing address included in a trace data string stored in a trace memory is shifted from the end of the trace data string to the head. Processing address search means for sequentially searching, and in the process of searching for individual processing addresses by the processing address search means, when the value of a predetermined processing address currently being searched for is smaller than the value of any processing address already searched for. And processing data extracting means for extracting predetermined processing data corresponding to the predetermined processing address from the trace data sequence.

According to a second aspect of the present invention, in the case where there is a place in the trace data sequence stored in the trace memory where a condition match is to be detected in the loop processing, the loop processing is performed. Loop-end processing searching means for searching for the loop-end processing located at the end of the loop, a specific storage address of the trace memory storing the loop-end processing searched by the loop-end processing searching means, and a specific storage address. 2. An address storage means for storing a written specific processing address, wherein the processing address search means according to claim 1 stores a predetermined processing address value in a search process of each processing address. When the value becomes equal to the value of a specific processing address stored in the address storage means for the first time, that address It is characterized in that the search continues for individual processing address from a particular storage address stored in the unit.

[0020]

First, in the first aspect of the present invention,
Each processing address included in the trace data string stored in the trace memory is searched in order from the end to the top of the trace data string by the processing address search means. In the process of searching for individual processing addresses according to the above, only when the value of the predetermined processing address currently being searched is smaller than the value of any processing address already searched for,
The predetermined processing data corresponding to the previous predetermined processing address is extracted from the trace data string, and as a result, is redundantly stored in the trace memory according to the loop processing in the program created for the control operation device. The same processing data is output only once to the display device.

[0021] In the second aspect of the present invention, the loop end processing retrieving means exists in the loop processing at a location where a condition match is to be detected in the trace data string stored in the trace memory. If the loop end process located at the end of the loop process is searched, the loop storage process searched by the previous loop end process search unit is stored in the address storage unit. An address and a specific processing address written in the specific storage address are stored. When the value of a predetermined processing address in the process of searching for an individual processing address first becomes equal to the value of a specific processing address stored in the previous address storage means by the processing address search means, the address storage is performed. The search for the individual processing address is continued from the specific storage address stored in the means, and as a result, the data is redundantly stored in the trace memory in accordance with the loop processing in the program created for the control operation device. Of the same processing data, only the processing data in the loop processing in which the part where the condition matching should be detected exists is output to the display device.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment, first,
A first embodiment will be described to explain the first invention described in claim 1, and then a second embodiment will be described to describe the second invention described in claim 2. I do. Further, in the present invention, the system configuration of the control operation device 1 already shown in FIG. 5 can be applied as it is.
The description of both the first and second embodiments is based on the system configuration of FIG.

First, a description will be given of a first embodiment, which is a trace data search method applied to the control arithmetic unit 1 having no condition match detection function. FIG. 1 is a flowchart showing the program processing of the trace data search method according to the first embodiment of the present invention.

As shown in FIG.
Sets the value of the trace end pointer of the trace memory 15 to the trace data search pointer in order to start the trace data search from the end of the trace data string stored in the trace memory 15, and sets the maximum address of the program memory 12 The value (arbitrary value) is set to a variable AD MAX as an initial value (S21). However, this variable AD MAX is stored in the trace memory control unit 1
6 shows the minimum value of the processing address (outputted minimum processing address) output to the display device 2 under the control of 6. In particular, the processing address retrieved in the course of this program processing is already output to the display device 2. It is used to determine whether or not it has been performed.

Next, the operation execution unit 11 sets the processing address written in the storage address of the trace memory 15 pointed to by the current trace data search pointer to the variable AD (S22), and further sets the value of the variable AD. Is the variable A
It is determined whether or not the value is greater than or equal to D MAX (S2).
3). As a result of this determination, when the value of the current processing address indicated by the variable AD is smaller than the value of the current output minimum processing address indicated by the variable AD MAX, the arithmetic execution unit 11 sets the trace memory control unit 16 Control, the trace data of the trace memory 15 pointed to by the current trace data search pointer is output to the display device 2 and the processing address pointed to by the current trace data search pointer, that is, set to the variable AD in S22. The current processing address that has been
AX is set (S24). On the other hand, if the value of the current processing address indicated by the variable AD is equal to or greater than the value of the current output minimum processing address indicated by the variable AD MAX, the arithmetic execution unit 11 sends the current processing address to the display device 2. As a result, the output processing of the trace data relating to S24 is not performed.

Next, the arithmetic execution unit 11 updates the value of the current trace data search pointer by -2 (pointer decrement), so that the trace data to be searched next for the value of the trace data search pointer is updated. After setting to the storage address of the existing trace memory 15 (S25), it is determined whether or not the search of all the trace data has been completed (S26). And the arithmetic execution unit 11
Repeats the processing from S22 to search all the trace data in the trace memory 15, and the trace data to be searched is stored in the trace memory 1.
This program processing ends when it no longer exists in 5.

The manner in which trace data is actually retrieved by the above-described program processing of FIG. 1 will now be described with reference to the trace data sequence shown in FIG. 8 as an example.

First, in the trace data search method by this program processing, to start the search of the trace data from the end of the trace data sequence, the address 1018H which is the value of the trace end pointer is first set in the trace data search pointer. (S21) Further, 1 of the storage address indicated by the trace data search pointer
"00" of the processing address written at address 018H
“07H” is set in the variable AD (S22). Then, the magnitude of the value of the variable AD and the value of the variable AD MAX are successively determined (S23). At this time, the output minimum processing address indicated by the variable AD MAX is the minimum address of the program memory 12 Since the value is set and the processing address “0007H” indicated by the variable AD is of course smaller, the trace data pointed by the trace data search pointer is output to the display device 2 and the processing address at that time is “ 0007H ”is the variable AD
MAX (S24). Thus, the display device 2 first displays "0007H", which is the processing address of the storage address 1018H, and the corresponding 10th address.
"9" which is the processing data of the address 19H is output.

Next, when the output processing of the trace data at the storage address 1018H is completed, the value of the trace data search pointer is set to the address 1016H, and the processing returns to S22 (S25, S26). The processing address “00” at address 1016H
06H ”is set in the variable AD.
The output minimum processing address indicated by D MAX is “0007
H ", and the processing address is smaller than the output minimum processing address. Therefore, the display device 2 displays" 0006H "which is the processing address of the storage address 1016H.
And "9", which is the processing data at the address 1017H, is output. The output processing of the trace data is continued as long as the relationship that the value of the processing address indicated by the variable AD is smaller than the value of the output minimum processing address indicated by the variable AD MAX is maintained. Thereby, the display device 2 displays the storage address of 10
The processing addresses of the addresses 14H, 1012H, and 1010H are “0004H”, “0003H”, and “0002H”, and 1015H, 1
The processing data "9", "3", and "6" at the addresses 013H and 1011H are sequentially output, and the variable AD MAX is set to "0002H", which is the processing address output last. Is done.

Next, when the output processing of the trace data up to the storage address 1010H is completed, the processing address "0004H" at the storage address 100EH is set to the variable AD. The output minimum processing address indicated by MAX is “0”.
002H ”, and the processing address is larger than the output minimum processing address.
The processing address “0004H” of the address E and the corresponding processing data “6” of the address 100F are not output to the display device 2. Then, while the relationship that the value of the processing address indicated by the variable AD is equal to or more than the value of the output minimum processing address indicated by the variable AD MAX is maintained, the trace data is not output to the display device 2, and as a result, Storage addresses 100CH, 100AH, 10
The processing addresses of the addresses 08H, 1006H and 1004H are “0003H”, “0002H”,
"0004H", "0003H" and "0002H"
And the corresponding 100DH, 100BH, 100
The processed data “3”, “3”, “3”, “3”, and “0” at the addresses 9H, 1007H, and 1005H are not output to the display device 2.

Next, when the processing up to the storage address 1004H is completed, the storage address 1002H
The processing address “0001H” at address H is a variable A
At this time, the output minimum processing address indicated by the variable AD MAX is “0002H”, and the processing address is again smaller than the output minimum processing address. Storage address 10
"0001H" which is the processing address of the address 02H, and "3" which is the processing data of the address 1003H corresponding thereto.
Is output. Then, similarly, the variable AD MA
"0001H" for X and "0000H" for variable AD
Are set, and the display device 2 outputs “0000H” which is the processing address of the storage address 1000H and “0” which is the processing data of the address 1001H corresponding to the storage address. At this point, the trace processing to be searched no longer exists in the trace memory 15 and the program processing ends.

As a result, as shown in FIG. 9, in the area before and after the operator "+" on the screen of the display device 2, the storage addresses 1011H and 1011H in the trace memory 15 are stored.
The processing data “6”, “3” and “9” related to the last loop processing written at the respective addresses 1013H and 1015H are not overwritten and displayed as in the related art, and are similar to the related art. In this way, even when a lot of loop processing is present in a program created for the control operation device 1, display of predetermined processing data on the display device 2 can be performed in a minimum time. It can be completed.

Next, a description will be given of a second embodiment which is a trace data search method applied to the control arithmetic unit 1 having a condition match detection function. FIG. 2 is a flowchart showing the program processing of the trace data search method according to the second embodiment of the present invention.

As shown in FIG.
Since it is assumed that a location where a condition match should be detected exists in a loop process in a program created for the control operation device 1, it is particularly necessary to detect the condition match. The value of the condition matching pointer is set in the trace data search pointer in order to search for the loop end process located at the end of the loop process in which the part exists (S31). The condition matching pointer is set in the trace memory 15 in the same manner as the trace start pointer and the trace end pointer, and designates a storage address in the trace memory 15 where a condition match is to be detected. The arithmetic control unit 11 then stores the trace memory 1 pointed to by the current trace data search pointer.
The processing address written in the storage address of No. 5 is set in a variable AD (S32), and the value of the variable AD is set in a variable AD MIN (S33). However, this variable AD MIN is a variable for searching the above-mentioned loop end processing, and actually stores the processing address written in the storage address of the trace memory 15 pointed to by the previous trace data search pointer. .

Next, the arithmetic execution unit 11 updates the value of the current trace data search pointer by +2 to point to the next trace data (S34), and then updates the value of the updated trace data search pointer. Trace memory 1
It is determined whether or not the value of the trace data search pointer is equal to the value of the trace data search pointer (S35). The processing address written in the storage address of the trace memory 15 is set in the variable AD (S36), and it is determined whether or not the value of the variable AD is equal to or larger than the value of the variable AD MIN (S37). Then, the arithmetic execution unit 11 determines that the value of the current processing address indicated by the variable AD is the variable AD MIN
As long as the value is equal to or more than the value of the previous processing address indicated by S33,
Repeat the subsequent processing. In S35, if the updated value of the trace data search pointer becomes equal to the value of the trace end pointer, the arithmetic execution unit 1
1 sets the maximum value of the integer (arbitrary value of the address of the program memory 12; the same applies hereinafter) to a register LOOPA A (details will be described later) assuming that loop end processing does not exist (S38), and outputs S42 and subsequent steps described later. Execute the process.

Next, in S37, when the value of the current processing address indicated by the variable AD becomes smaller than the value of the previous processing address indicated by the variable ADMIN, the operation execution unit 11
Sets the value of the current trace data search pointer to the value in the immediately preceding trace data (pointer decrement), assuming that the loop end processing can be searched (S39). Then, the arithmetic execution unit 11 stores the trace memory 15 pointed to by the previous trace data search pointer.
Is saved in the register LOOPEP (S40), and similarly, the processing address written in the storage address of the trace memory 15 pointed to by the previous trace data search pointer is stored in the register LOOP.
It is evacuated to PE A (S41). Of these, the register LOOPEP stores the storage address of the loop end processing at the time of detecting the condition match, and the register LOOPA A stores the processing address of the loop end processing at the time of detecting the condition match. is there.

Next, as in the first embodiment, the arithmetic execution unit 11 starts the trace data search in the trace memory 15 in order to start searching for the trace data from the end of the trace data string stored in the trace memory 15. The value of the end pointer is set in the trace data search pointer, and the maximum value of the integer is set as an initial value in a variable AD MAX (synonymous with the variable AD MAX in the first embodiment) (S
42) Further, the processing address written in the storage address of the trace memory 15 pointed to by the current trace data search pointer is set in the variable AD (S43).
Then, the arithmetic execution unit 11 determines whether or not the value of the variable AD is equal to the value of the register LOOP A (S4).
4) As a result, when the value of the current processing address indicated by the variable AD is not equal to the value of the processing address of the loop end processing at the time of detecting the condition match indicated by the register LOOPA A, the value of the variable AD is further increased. It is determined whether or not the value of the variable AD MAX is equal to or more than the value of the variable AD MAX (S45). As a result, the value of the current processing address indicated by the variable AD is changed to the variable AD MAX.
Is smaller than the value of the current output minimum processing address indicated by, the trace data in the trace memory 15 pointed to by the current trace data search pointer is output to the display device 2 and the current trace data search pointer is The processing address to be pointed is set in the variable AD MAX (S46). On the other hand, if the value of the current processing address indicated by the variable AD is equal to or greater than the value of the current output minimum processing address indicated by the variable AD MAX, the operation execution unit 11
Assuming that the current processing address has already been output to the display device 2, the trace data output process relating to S46 is not performed.

Next, the arithmetic execution unit 11 updates the value of the current trace data search pointer by −2 (pointer decrement), so that the trace data to be searched next is updated by the trace data search pointer value. After setting to the storage address of the existing trace memory 15 (S47), it is determined whether or not the search of all the trace data has been completed (S48). And the arithmetic execution unit 11
Repeatedly executes the processing after S43 in order to search all the trace data in the trace memory 15, and in S44, the value of the current processing address indicated by the variable AD indicates a loop when the condition match indicated by the register LOOPA A is detected. When the value becomes equal to the value of the processing address of the end processing for the first time, the maximum value of the integer is stored in the register LOOPE.
A, and the value of the storage address of the loop end process at the time of detecting the condition match indicated by the register LOOPEP is set in the trace data search pointer and the process is continued (S49). This program processing ends when the trace memory 15 no longer exists.

The manner in which trace data is actually searched by the above-described program processing of FIG. 2 will be described with reference to FIGS. 3 and 4. FIG. 3 is a diagram showing the state of the trace data string stored in the trace memory 15 and the value of the condition matching pointer stored in the trace memory 15 in accordance with the execution of the operation of the object program shown in FIG. FIG. 4 is similar to FIG.
FIG. 7 is a diagram showing a state where predetermined processing data in the trace data sequence shown in FIG.

First, as shown in FIG. 3, in the trace data search method by this program processing, the value of the condition matching pointer 100C, which is the value of the condition matching pointer, is searched in order to search for a loop end process in a loop process in which a condition match has occurred.
Address H is set first in the trace data search pointer (S31). Then, the processing address “0003H” written at the storage address 100CH indicated by the trace data search pointer is set to the variable AD (S32), and the processing address “0003H” indicated by the variable AD is set to the variable AD. It is set to MIN (S33).

Next, the processing address "0" indicated by the variable AD
003H ”is set in the variable AD MIN, the address 100CH, which is the value of the trace data search pointer, is +
It is updated by 2 to become the address 100EH (S34), and it is subsequently determined whether or not the updated trace data search pointer value is equal to the trace end pointer value (S35). At this time, the value of the updated trace data search pointer is address 100EH and, of course, is not equal to the value of the trace end pointer. Therefore, the processing address "0004H" written in the storage address indicated by the trace data search pointer is used. Is set to the variable AD (S36). Then, it is subsequently determined whether or not “0004H” which is the value of the variable AD is greater than or equal to the value of the variable AD MIN (S37).
The value of the previous processing address indicated by MIN is “0003
H ”, in this case, the above-described processing after S33 is repeatedly executed.

Next, the processing after S33 is repeatedly executed, and the value of the trace data search pointer is updated to S1010H in S34.
When "0002H" of the processing address indicated by the trace data search pointer is set in the variable AD in S3,
7, the magnitude of the value of the variable AD and the value of the variable AD MIN are successively determined, but the current value of the variable AD MIN is “0004H” of the previous processing address (the value of the processing address at the storage address 100EH). ), It is searched that the storage address 100EH is a loop end process. Then, in order to secure the trace data at the time of this loop end processing, the value of the trace data search pointer is returned from the current address 1010H to the previous address 100EH (S39), and the value of the trace data search pointer 100EH is changed. While being stored in the register LOOPEP (S40),
The processing address “0004H” written at the address 100EH is stored in the register LOOPA (S41).

Next, the storage address of the loop end processing at the time of detecting a condition match is stored in LOOPEP.
When the processing address of the loop end processing at the time of detecting the condition match is stored in the register LOOP A, the value of the trace end pointer is output to the display device 2 in the same manner as in the first embodiment for the output processing of the trace data. 1018H
The address is set in the trace data search pointer (S4
2) Further, the processing address “0007H” written at the storage address 1018H indicated by the trace data search pointer is set in the variable AD (S43). The value of the variable AD is stored in the register L
It is subsequently determined whether or not the value is equal to the value of OOPE A (S44). At this point, the processing address indicated by the variable AD is “0007H”, and the loop end processing at the time of detecting the condition match indicated by the register LOOPA A is performed. Since the processing address is “0004H”, the value of the variable AD and the variable AD
The magnitude with the value of MAX is subsequently determined (S45). At this time, the maximum value of the address of the program memory 12 is set in the output minimum processing address indicated by the variable AD MAX, and “000” of the processing address indicated by the variable AD is set.
7H ”is of course smaller, so that the trace data pointed to by the trace data search pointer is output to the display device 2 and the processing address at that time is“ 0007H ”.
Is set to the variable AD MAX (S46), and the display device 2 first stores the storage address 1018H
The address “0007H”, which is the processing address of the address, and the corresponding processing data “9”, which is the processing data of the address 1019H, are output.

Next, when the output processing of the trace data at the storage address 1018H is completed, the value of the trace data search pointer is set to the address 1016H, and the processing returns to S43 (S47, S48). The device 2 stores “0006H”, which is the processing address of the storage address 1016H, and 1017 corresponding to the processing address.
"9" which is the processing data of the address H is output. Then, the processing address “0004H” written at address 1014, which is the current value of the trace data search pointer, is set in the variable AD by the processing after S43 again. In the next S44, the variable AD Becomes equal to the processing address “0004H” of the loop end processing at the time of detecting the condition match indicated by the register LOOPA A for the first time, so that the maximum value of the integer becomes the register LOOPA A.
At the same time, the address 100EH, which is the storage address of the loop end processing at the time of detecting the condition match indicated by the register LOOPEP, is set in the trace data search pointer (S49). As a result, in S46, the display device 2 “0004H” which is the processing address of the storage address 100EH and the corresponding 100
"6" which is the processing data of the address FH is output.

Next, when the processing up to the storage address 100EH is completed, the display device 2 displays the storage addresses 100CH and 100CH according to the same principle as in the first embodiment.
Processing addresses of respective addresses of 100AH, 1002H and 1000H are “0003H” and “0002”.
H, "0001H" and "0000H" and their corresponding 100DH, 100BH, 1003H and 10
"3" which is the processing data of each address of 01H,
"3", "3", and "0" are sequentially output. At this point, the trace data to be searched for no longer exists in the trace memory 15, and the program processing ends. As a result, as shown in FIG. 4, the area before and after the operator “+” on the screen of the display device 2 is not the processing data related to the last loop processing but the storage address 100BH in the trace memory 15. Processing data "3", "3", and "6" relating to the loop processing in which the matching of the conditions written in the respective addresses of 100DH and 100FH has occurred can be constantly displayed.

[0046]

As described above in detail, according to the first aspect, the data is stored in the trace memory in an overlapping manner in accordance with the loop processing in the program created for the control arithmetic unit. Since the same processing data is output only once to the display device, the display data is not displayed on the screen of the display device without the conventional overwriting display.
In addition, only predetermined processing data is displayed in the same state as in the related art, so that even when a lot of loop processing is present in the program, the display of the predetermined processing data on the display device can be performed in a minimum time. Can be completed.

According to the second aspect of the present invention, of the same processing data redundantly stored in the trace memory in accordance with the loop processing in the program created for the control operation device, Is output only for the processing data in the loop processing in which the location where the condition matching should be detected exists, so the processing data for the last loop processing in the program is displayed on the screen of the display device. Instead, it is possible to constantly display the processing data relating to the loop processing in which the condition is matched.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a program processing of a trace data search method according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a program process of a trace data search method according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a state of a trace data string stored in a trace memory and a value of a coincidence pointer stored in the trace memory in accordance with the execution of the operation of the object program shown in FIG. 7;

FIG. 4 is a diagram showing a state in which predetermined processing data in the trace data string shown in FIG. 3 is displayed on a screen of a display device.

FIG. 5 is a block diagram showing a general system configuration of a control arithmetic device having a trace function.

FIG. 6 is a diagram showing an example of a source program written in an FB diagram.

FIG. 7 is a diagram showing an example of an object program obtained by compiling the source program shown in FIG. 6;

8 is a diagram showing a state of a trace data string stored in a trace memory in accordance with the execution of the operation of the object program shown in FIG. 7;

9 is a diagram showing a state in which predetermined processing data of the trace data string shown in FIG. 8 is displayed on a screen of a display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control arithmetic unit 2 display device 11 arithmetic execution unit 12 program memory 13 program counter 14 data memory 15 trace memory 16 trace memory control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 11/28-11/34

Claims (2)

(57) [Claims] 1. A processing address search means for sequentially searching individual processing addresses included in a trace data string stored in a trace memory from the end to the beginning of the trace data string; In the process of searching for individual processing addresses, only when the value of the predetermined processing address currently being searched is smaller than the value of any previously searched processing address, predetermined processing data corresponding to the predetermined processing address is deleted. A trace data search method, comprising: processing data extraction means for extracting from the trace data sequence. 2. A method according to claim 1, further comprising the step of: executing a loop end process located at the end of the loop process when a location where a condition match is to be detected exists in the loop process in the trace data string stored in the trace memory. Loop end processing searching means for searching; a specific storage address of the trace memory in which the loop end processing searched by the loop end processing searching means is stored; and a specific processing written at the predetermined storage address Address processing means for storing an address and the processing address search means, wherein the processing address search means stores the value of the predetermined processing address in the process of searching for the individual processing address in the address storage means. When the value becomes equal to the value of the specific processing address for the first time, it is stored in the address storage means. The particular search method trace data according to claim 1, wherein the storage address, characterized in that the search continues for the individual processing addresses that.