Automatic conversion of source code from 32-bit to 64-bit

• US 7,406,681 B1
• Filed: 10/12/2000
• Issued: 07/29/2008
• Est. Priority Date: 10/12/2000
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Hinker, Paul J.
• Primary Examiner(s): Vo; Ted T.
• Application Number:
  US09/686,628
• Time in Patent Office: 2,847 Days
• Field of Search: 717106-119, 717136-145, 717162-166
• US Class Current: 717/137
• CPC Class Codes: G06F 8/51 Source to source
• CPC Class Codes: G06F 8/76 Adapting program code to run in a different environment; Porting

Abstract

In accordance with methods and systems consistent with the present invention, a system that automatically generates 32-bit to 64 bit interfaces to 64-bit code is provided. These interfaces provide for the use of optional parameters and, because they are written in 64-bit code, also allow for parameter checking. These interfaces are automatically generated to allow a programmer to maintain compatibility with 64-bit libraries from 32-bit source code.

Claims

1. A method in a data processing system, comprising the steps of:

receiving 32-bit source code;

generating, from the 32-bit source code, a 32-bit interface file including statements describing characteristics of parameters in the 32-bit source code, wherein generating a 32-bit interface file includes invoking an interface generator that;

scans the 32-bit source code and creates the interface file according to a definition; and

adds to the interface file the statements describing characteristics of the parameters by parsing the 32-bit source code; and

automatically generating, based on the statements in the 32-bit interface file, a 32-bit to 64-bit conversion stub that is used by the 32-bit source code to invoke 64-bit code, wherein automatically generating a 32-bit to 64-bit conversion stub includes invoking a stub generator that;

reads the 32-bit interface file to populate a hash table with information identifying the parameters in the interface file;

re-reads the 32-bit interface file to populate the hash table with information indicating processing that occurs for the statements in the interface file; and

generates the 32-bit to 64-bit conversion stub using the hash table.

2. The method of claim 1, wherein the 32-bit source code includes at least one of an integer parameter and a logical parameter and wherein generating a 32-bit interface includes:

determining whether the at least one of an integer and logical parameter has input directionality, output directionality, or input and output directionality; and

inserting into the 32-bit interface file code generator statements corresponding to the determined directionality of the at least one parameter.

3. The method of claim 1, wherein generating a 32-bit interface file includes:

adding to the interface file statements indicating a number of dimensions of at least one parameter and a number of elements in each dimension.

4. The method of claim 1, wherein the characteristics include an indication of a conditional value for at least one of the required parameters.

5. The method of claim 1, wherein the characteristics include an indication of whether at least one of the required parameters is used to contain a return value.

6. The method of claim 1, wherein the characteristics include a directionality of at least one of the required parameters.

7. The method of claim 1, wherein the characteristics include an indication of whether at least one of the required parameters returns a multidimensional variable.

8. The method of claim 1, wherein the characteristics include an indication of whether a size of at least one of the required parameters is based on another one of the required parameters.

9. The method of claim 1, wherein the characteristics include an indication of whether at least one of the required parameters is a work space parameter.

10. A computer-readable memory device containing instructions for controlling a data processing system to perform a method comprising the steps of:

receiving 32-bit source code;

generating, from the 32-bit source code, a 32-bit interface file including statements describing characteristics of parameters in the 32-bit source code, wherein generating a 32-bit interface file includes invoking an interface generator that

scans the 32-bit source code and creates the interface file according to a definition; and

adds to the interface file the statements describing characteristics of the parameters by parsing the 32-bit source code; and

automatically generating, based on the statements in the 32-bit interface file, a 32-bit to 64-bit conversion stub that is used by the 32-bit source code to invoke 64-bit code, wherein automatically generating a 32-bit to 64-bit conversion stub includes invoking a stub generator that

reads the 32-bit interface file to populate a hash table with information identifying the parameters in the interface file;

re-reads the 32-bit interface file to populate the hash table with information indicating processing that occurs for the statements in the interface file; and

generates the 32-bit to 64-bit conversion stub using the hash table.

11. The computer-readable memory device of claim 10, wherein the 32-bit source code has a subprogram with a parameter and wherein generating a 32-bit interface file includes:

determining whether the parameter in the subprogram has input directionality, output directionality, or input and output directionality; and

inserting into the 32-bit interface file code generator statements corresponding to the determined directionality of the parameter in the subprogram.

12. The computer-readable memory device of claim 10, wherein generating a 32-bit interface file includes:

adding to the interface file statements indicating a number of dimensions of at least one parameter and a number of elements in each dimension.

13. The computer-readable memory device of claim 10, wherein the characteristics include an indication of a conditional value for at least one of the required parameters.

14. The computer-readable memory device of claim 10, wherein the characteristics include an indication of whether at least one of the required parameters is used to contain a return value.

15. The computer-readable memory device of claim 10, wherein the characteristics include a directionality of at least one of the required parameters.

16. The computer-readable memory device of claim 10, wherein the characteristics include an indication of whether at least one of the required parameters returns a multidimensional variable.

17. The computer-readable memory device of claim 10, wherein the characteristics include an indication of whether a size of at least one of the required parameters is based on another one of the required parameters.

18. The computer-readable memory device of claim 10, wherein the characteristics include an indication of whether at least one of the required parameters is a work space parameter.

19. A data processing system comprising:

means for receiving 32-bit source code;

means for generating, from the 32-bit source code, a 32-bit interface file including statements describing characteristics of parameters in the 32-bit source code,

wherein the means for generating a 32-bit interface file includes means for invoking an interface generator that

scans the 32-bit source code and creates the interface file according to a definition; and

adds to the interface file the statements describing characteristics of the parameters by parsing the 32-bit source code; and

means for automatically generating, based on the statements in the 32-bit interface file, a 32-bit to 64-bit conversion stub that is used by the 32-bit source code to invoke 64-bit code, wherein the means for automatically generating a 32-bit to 64-bit conversion stub includes means for invoking a stub generator that

reads the 32-bit interface file to populate a hash table with information identifying the parameters in the interface file;

re-reads the 32-bit interface file to populate the hash table with information indicating processing that occurs for the statements in the interface file; and

generates the 32-bit to 64-bit conversion stub using the hash table.

20. The system of claim 19, wherein the 32-bit source code includes at least one of an integer parameter and a logical parameter and wherein the means for generating a 32-bit interface includes:

means for determining whether the at least one of an integer and logical parameter has input directionality, output directionality, or input and output directionality; and

means for inserting into the 32-bit interface file code generator statements corresponding to the determined directionality of the at least one parameter.

21. The system of claim 19, wherein the means for generating a 32-bit interface file includes:

means for adding to the interface file statements indicating a number of dimensions of at least one parameter and a number of elements in each dimension.

22. The system of claim 19, wherein the characteristics include an indication of a conditional value for at least one of the required parameters.

23. The system of claim 19, wherein the characteristics include an indication of whether at least one of the required parameters is used to contain a return value.

24. The system of claim 19, wherein the characteristics include a directionality of at least one of the required parameters.

25. The system of claim 19, wherein the characteristics include an indication of whether at least one of the required parameters returns a multidimensional variable.

26. The system of claim 19, wherein the characteristics include an indication of whether a size of at least one of the required parameters is based on another one of the required parameters.

27. The system of claim 19, wherein the characteristics include an indication of whether at least one of the required parameters is a work space parameter.