JPH03282632A - Static data recording mechanism - Google Patents

Abstract

PURPOSE:To shorten the debugging time by outputting selectively the data showing a return address and the data saved temporarily out of those data stacked in the past via an identifier in a debug state. CONSTITUTION:A log-out address signal 10 is used to the pointer of a static data recording memory 1 via a selector 6. The data on the memory 1 are sent to a data editing device 4 together with the identifier of a corresponding identifier recording memory 2. Meanwhile an instruction is given to the device 4 with an output data selection signal 11 for only the data on a return address, only the data except that on the return address, or both data. Thus the device 4 decides only the pointed data by reference to the data on the memory 2 and then outputs the data to a log-out output device 7. In such a constitution, the debugging time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stack data recording mechanism, particularly a data stack for saving a return address when calling a subroutine, and for saving temporarily saved data. The present invention relates to a stack data recording mechanism in an information processing apparatus having a stack data recording mechanism.

[Conventional technology]

Conventionally, information processing devices that have a data stacking mechanism for saving a return address when calling a subroutine or saving temporarily saved data, etc. have been asked whether the data is stacked or represents a return address. - There is no distinction between whether the data represents data that has been saved or the like, and there is no mechanism for sequentially recording saved data.

[Invention or problem to be solved]

In the conventional information processing device described above, it is difficult to judge during debugging whether the data in the stack frame represents a return address or data that has been saved in the past. There are problems with data being lost and debugging taking time.

[Means to solve the problem]

The stack data recording mechanism of the present invention is of a type that saves a return address when an instruction or subroutine is called when an instruction that involves stack manipulation is executed in an information processing device having a data stack mechanism. , a type identification means for identifying whether it is a type other than this type; an identifier recording means for sequentially recording the identification result of the type identification means as an identifier in one-to-one correspondence with data to be stacked; readout type selection means for instructing to read either the address or data other than the return address, or both; The data readout means selects and reads data based on the identifier.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, which includes a stack data recording memory 1, an identifier recording memory 2, an instruction decoder 3, a data editing device 4, a counter 5, a selector 6,
It is composed of a lockout output device 7 and an or game 1-8.9.

In the above configuration, the stack data recording memory 1 is a memory that sequentially records stack data 12 to be saved in a stack area of a system (not shown), and is paired with the identifier recording memory 2 having a data length of 1 to 1. The configuration is such that it is compatible with both and can be recorded at the same time. As pointers indicating the stack data recording memory 1 and the identifier recording memory 2, the address signal 10 for lockout from the data editing device 4 is used during take-out during debugging, and the instruction selection signal for performing bush town during normal operation. are grouped into ORKs 1 to 8, and the output of a counter 5, which is sequentially updated accordingly, is switched and used by a selector 6. To the identifier recording memory 2, out of the outputs of the instruction decoder 3, instruction selection signals of the type that block the return address are collectively inputted from the OR games 4 to 9. In other words, if the corresponding output of the instruction decoder 3 becomes "1" when the instruction is executed, the data input to the stack data recording memory 1- will be stored in the identifier recording memory 2. " ] " is input, otherwise "'0" is input as the identifier.

Next, the data in the data recording memory 1 is transferred to the logara 1 by the data editing device 4 for the output device 7.
Describe the case of outputting to . In this case, the selector 6 uses the lockout address signal 10 as the pointer of the data recording memory 1, and the data in the data recording memory 1 is sent to the data editing device 4 together with the corresponding identifier in the identifier recording memory 2. Further, the data editing device 4 receives an instruction for only the return address data, only the data other than the return address, or both data by the output data selection signal 11.

In response to this instruction, the data editing device 4 determines only the instructed data by referring to the data in the identifier recording memory 2, and outputs it to the lockout output device 7.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to view past stacked data during debugging, and also to be able to display return addresses from past stacked data using identifiers, and data saved by -time saving. This makes it possible to select and output the information representing the , which has the effect of shortening debugging time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. ] Stack data recording memory, 2.. identifier recording memory, 3.. instruction coder, 4. data editing device,
5... Counter, 6... Selector, 7. Output device for lockout, 8, 9... OR gate.

Claims (1)

[Claims] In an information processing device that has a data stack mechanism, when an instruction that involves stack manipulation is executed, identifies whether this instruction is of the type that saves the return address when calling a subroutine, etc., or is of a type other than this type. an identifier recording means for sequentially recording the identification result of the type identification means in a one-to-one correspondence with the data stacked as an identifier, and which of the return address or data other than the return address at the time of debugging. readout type selection means for instructing to read one or both of them; and data reading means for selecting and reading out only the data specified by the readout type selection means using the identifier from the identifier recording means. A stack data recording mechanism characterized by having: