Using core files to develop diagnostic programs

Patent metadata

Field	Value
Publication number	US-9720807-B2
Application number	US-201715399841-A
Country	US
Kind code	B2
Filing date	Jan 6, 2017
Priority date	Sep 28, 2015
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A list of classes found in a core dump file is determined. One or more classes requested by a classloader is also determined. A set of one or more classes requested by the classloader that are found in the core dump file is then determined.

First claim

What is claimed is:

1. A method for resolving classes from a core dump file in order to debug a program, the method comprising:
determining, by one or more computer processors, one or more sets of classes requested by a classloader that are found in a core dump file;
determining, by one or more computer processors, a constructor for the determined one or more sets of classes;
locating, by one or more computer processors, an instance of an object in the core dump file, wherein the object is an instance of a class of the one or more sets of classes;
copying, by one or more computer processors, one or more object fields from the object into a new object; and
creating, by one or more computer processors, a proxy for initializing the new object using the determined constructor and the copied one or more object fields.

2. The method of claim 1 , further comprising:
determining, by one or more computer processors, a class definition and associated code for the classes found in the core dump file.

3. The method of claim 1 , further comprising:
determining, by one or more computer processors, a factory method for the determined one or more set of classes;
determining, by one or more computer processors, one or more object fields for the determined one or more sets of classes; and
creating, by one or more computer processors, a proxy using the determined factory method and the determined one or more object fields.

4. The method of claim 1 , wherein the core dump file is a file which consists of a recorded state of a working memory of a computer program at a specific time.

5. The method of claim 4 , wherein the specific time is the time when a program terminates abnormally.

6. A computer program product for resolving classes from a core dump file in order to debug program, the computer program product comprising:
one or more computer readable storage media; and
program instructions stored on the one or more computer readable storage media, the program instructions comprising:
program instructions to determine one or more sets of classes requested by a classloader that are found in a core dump file;
program instructions to determine a constructor for the determined one or more sets of classes;
program instructions to locate an instance of an object in the core dump file, wherein the object is an instance of a class of the one or more sets of classes;
program instructions to copy one or more object fields from the object into a new object; and
program instructions to create a proxy for initializing the new object using the determined constructor and the copied one or more object fields.

7. The computer program product of claim 6 , further comprising program instructions, stored on the one or more computer readable storage media, to:
determine a class definition and associated code for the classes found in the core dump file.

8. The computer program product of claim 6 , further comprising program instructions, stored on the one or more computer readable storage media, to:
determine a factory method for the determined one or more sets of classes;
determine one or more object fields for the determined one or more sets of classes; and
create a proxy using the determined factory method and the determined one or more object fields.

9. The computer program product of claim 6 , wherein the core dump file is a file which consists of a recorded state of a working memory of a computer program at a specific time.

10. The computer program product of claim 9 , wherein the specific time is the time when a program terminates abnormally.

11. A computer system for resolving classes from a core dump file in order to debug a program, the computer system comprising:
one or more computer processors;
one or more computer readable storage media; and
program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
program instructions to determine one or more sets of classes requested by a classloader that are found in a core dump file;
program instructions to determine a constructor for the determined one or more sets of classes;
program instructions to locate an instance of an object in the core dump file, wherein the object is an instance of a class of the one or more sets of classes;
program instructions to copy one or more object fields from the object into a new object; and
program instructions to create a proxy for initializing the new object using the determined constructor and the copied one or more object fields.

12. The computer system of claim 11 , further comprising program instructions, stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, to:
determine a class definition and associated code for the classes found in the core dump file.

13. The computer system of claim 11 , further comprising program instructions, stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, to:
determine a factory method for the determined one or more sets of classes;
determine one or more object fields for the determined one or more sets of classes; and
create a proxy using the determined factory method and the determined one or more object fields.

14. The computer system of claim 11 , wherein the core dump file is a file which consists of a recorded state of a working memory of a computer program at a specific time.

15. The computer system of claim 14 , wherein the specific time is the time when a program terminates abnormally.

Assignees

• IBM

Inventors

• Chamberlain Richard N
• Hellyer Howard J
• Peters Matthew F
• Pilkington Adam J

Classifications

• G06F11/3688

  for test execution, e.g. scheduling of test suites · CPC title

• G06F11/364

  tracing values on a bus · CPC title

• G06F11/3466

  Performance evaluation by tracing or monitoring · CPC title

• G06F11/366 Primary

  using diagnostics (G06F11/0703 takes precedence) · CPC title