Object-oriented loader system with support for different load formats

• US 5,369,766 A
• Filed: 03/25/1993
• Issued: 11/29/1994
• Est. Priority Date: 03/25/1993
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: Taligent, Inc. (HP Inc.)
• Inventors: Nakano, Russell T., Heninger, Andrew G.
• Primary Examiner(s): Kriess, Kevin A.
• Assistant Examiner(s): KATBAB, ABDOLLAH
• Application Number:
  US08/037,054
• Time in Patent Office: 614 Days
• Field of Search: 395/700, 364/280, 364/DIG. 1
• US Class Current: 719/332
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
• CPC Class Codes: G06F 9/4488 Object-oriented

Abstract

A method and apparatus for an innovative object oriented framework system is disclosed. The system uses an innovative load architecture for a framework application and provides a system and method for dynamically linking load modules at runtime. The preferred embodiment employs a collection of load modules, each of which contains functions, static data, and classes to make the load modules appear as if they were statically linked together. However, code executing in one load module can perform operations on another load modules code, such as: calling a function, or obtaining a pointer to a function; accessing static data or obtaining a pointer to the static data; calling any public or protected member function of a class to obtain a pointer or access a public or protected data member of the class; or cast to any base of an object of a class.

Claims

1. An apparatus for processing a plurality of load modules in a computer, said plurality of load modules created by a plurality of development environments resulting in different load module formats, comprising:

(a) the computer;

(b) a storage in the computer;

(c) processing means in the computer for loading a first object-oriented load module of a first format in said address space;

(d) processing means in the computer for loading a second load module which can be non-object-oriented of a second format in said address space; and

(e) processing means in the computer for having said first object-oriented load module and said second load module execute in said address space and utilize portions of said second load module for execution of said first object-oriented load module.

2. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to call a function in said second load module.

3. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to obtain a pointer to a function in said second load module.

4. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to access exported static data in said second load module.

5. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to obtain a pointer to exported static data in said second load module.

6. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to call any function of a class in said second load module.

7. An apparatus for processing a plurality, of load modules in an address space as recited in claim 6, wherein the call is virtual.

8. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for Said first object-oriented load module to cast to any base in a second load module.

9. An apparatus for processing a plurality of load modules in an address space as recited in claim 8, wherein the base is virtual.

10. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to enable a load address in said second load module.

11. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, wherein the processing means in element (e) include means for said first object-oriented load module to link to an address space in said second load module.

12. An apparatus for processing a plurality of load modules in an address space as recited in claim 11, wherein the processing means in element (e) include means for specifying address space requirements above said first object-oriented load module below said first object-oriented load module.

13. An apparatus for processing a plurality Of load modules in an address space as recited in claim 1, including a cache for storing static data.

14. An apparatus for processing a plurality of load modules in an address space as recited in claim 1, including a loader semaphore for coordinating load module loading.

15. A method for processing a plurality of load modules in a computer with an address space, said plurality of load modules created by a plurality of development environments resulting in different load module formats, comprising the steps of:

(a) storing a first object-oriented load module of a first format in said address space;

(b) storing a second load module which can be non-object-oriented of a second format in said address space; and

(c) performing operations resident in said second load module in said first load module.

16. A method for processing a plurality of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of calling a function resident in said second load module from said first object-oriented load module.

17. A method for processing a plurality of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of obtaining a pointer to a function resident in said second load module from said first object-oriented load module.

18. A method for processing a plurality of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of accessing exported static data resident in said second load modified from said first object-oriented load module.

19. A method for processing a plurality of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of obtaining a pointer to exported static data resident in said second load module from said first object-oriented load module.

20. A method for processing a plurality, of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of allowing calling any function of a class resident in said second load module from said first object-oriented load module.

21. A method for processing a plurality of load modules in a computer with an address space as recited in claim 20, wherein the call is virtual.

22. A method for processing a plurality. Of load modules in a computer with an address space as recited in claim 15, wherein step (c) includes the step of casting to any base resident in said second load module from said first object-oriented load module.

23. A method for processing a plurality, of load modules in a computer with an address space as recited in claim 22, wherein the cast to any base is virtual.