Method and apparatus for extensible type-specific data presentation by a debugger

• US 5,675,730 A
• Filed: 07/07/1995
• Issued: 10/07/1997
• Est. Priority Date: 07/07/1995
• Status: Expired due to Fees

• Current Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Weatherford, David W., Perdue, Crispin S., Preisler, Thomas
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Decady, Albert
• Application Number:
  US08/499,715
• Time in Patent Office: 823 Days
• Field of Search: 395/183.01, 395/183.14, 395/700, 395/100, 395/101, 395/118, 364/275.5, 364/267.91
• US Class Current: 714/38.1
• CPC Class Codes: G06F 11/3664 Environments for testing or debugging software

Abstract

The present invention provides an economical, high performance, adaptable system and method for a type-specific data presentation by a development tool. In the preferred embodiment, one or more type-specific function name are found from the symbol table of the target program which might be able to display a data object. These type-specific function names are analyzed to determine if one and only one such name is able to display the data object and if so the found function name is used to call that function to display the data object. In the preferred embodiment the development tool is a debugger for C++ target programs.

Claims

1. A method for producing a type-specific data presentation of an expression in a target program, using a computer which has a processor, memory, display, input/output devices, the method comprising the steps of:

providing a program development tool configured to be used in testing the target program;

providing a first program mechanism in the program development tool configured to look-up a type-specific function name in a symbol table for the target program;

providing a second program mechanism configured to determine how many type-specific functions were found in the symbol table and if no type-specific functions were found, then to produce a static type display of the expression;

providing a third program mechanism configured to recognize that the second program mechanism has found one or more type-specific functions, and to perform argument type matching to resolve overloaded functions in order to determine if any of the one or more type-specific functions found can display the expression, and if one such type-specific function which can display the expression is found to call that function to display the expression, and if more than one such type-specific functions can display the expression to return an error and exit; and

under computer control producing a type-specific data presentation of an expression in a target program by calling said first program mechanism to look-up a type-specific function name in a symbol table for the target program, and if one or more type-specific function names are found in said symbol table calling said third program mechanism to determine whether one of said type-specific functions can produce a type-specific data presentation of said expression and if so to produce a type-specific data presentation of said expression.

2. The Method of claim 1 wherein the program development tool is a C++ development tool.

3. The Method of claim 2 wherein the program development tool is a C++ debugging tool.

4. The Method of claim 1 wherein the expression is a data object.

5. A computer implemented method for producing a type-specific data presentation of an expression in a target program, using a computer which has a processor, memory, display, input/output devices, the method comprising the steps of:

providing a program development tool configured to be used in testing the target program;

attempting to find a type-specific function name for displaying an expression designated by a user in a symbol table for said target program;

determining whether one or more type-specific function names were found which can produce a type-specific data presentation of the expression; and

if one and only one such type-specific function name is found, using the one and only one found type-specific function name to call a related type-specific function to produce a type-specific data presentation of the expression to the user.

6. The method of claim 5 wherein the program development tool is a C++ development tool.

7. The method of claim 6 wherein the program development tool is a C++ debugging tool.

8. The method of claim 5 wherein the expression is a data object.

9. An apparatus for providing a type-specific data presentation of a data object by a development tool used for testing a target program, having a computer which has a processor, memory, display, input/output devices, the apparatus comprising:

a development tool in the computer memory;

a type-specific function name computing mechanism coupled to the development tool, and configured to compute a type-specific function name from a static type of the data object, said type-specific function name computing mechanism comprising;

a look-up device coupled to the development tool which can compare a type-specific function name with other type-specific function names in the target program and related symbolic data, said look-up device to find any type-specific function names in said related symbolic data;

an overload resolution device coupled to said look-up device which can perform argument type matching to determine if one and only one type-specific function name was found which can provide a type-specific data presentation of the data object; and

a presentation device, coupled to the computer, which can display the data object in a manner defined by a type-specific function whose name was found to match the one and only one type-specific function name found by said overload resolution device, and which type-specific function can be used by the development tool for said display.

10. The apparatus of claim 9 wherein the development tool is a C++ development tool.

11. The apparatus of claim 10 wherein the development tool is a C++ debugger tool.

12. A computer program product comprising:

a computer usable medium having computer readable program code mechanisms embodied therein configured to display a data object in a type-specific data presentation, the computer readable program code mechanisms in said computer program product comprising;

computer readable code mechanisms configured to cause a computer to find a type-specific function name from a symbol table of a target program containing a static type of the data object;

computer readable code mechanisms configured to cause the computer to determine that one and only one type-specific function name can provide a type-specific data presentation for the data object; and

computer readable code mechanisms configured to cause the computer to use the found one and only one type-specific function name to call a related type-specific function to produce a type-specific data presentation of the data object.

13. The computer program product of claim 12 wherein the computer readable code mechanisms are C++ mechanisms.