System, method and apparatus of directly executing an architecture-independent binary program

• US 5,923,878 A
• Filed: 11/13/1996
• Issued: 07/13/1999
• Est. Priority Date: 11/13/1996
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Marsland, Timothy
• Primary Examiner(s): Hafiz, Tariq R.
• Assistant Examiner(s): Khatri, Anil
• Application Number:
  US08/748,933
• Time in Patent Office: 972 Days
• Field of Search: 395/708, 395/700, 395/702, 395/704, 395/706, 395/707, 395/709, 380/4, 707/100, 707/103, 364/784
• US Class Current: 717/139
• 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 9/45512 Command shells

Abstract

A system, method, and apparatus is disclosed for executing an architecture-independent binary program on a computer. An object file is read, and architecture-independent object code is extracted from the object file. Dynamic dependency information is also extracted from the object file. The dependency information is provided to an interpreter, which is invoked to execute the object code. The object file is preferably in an architecture-neutral format, preferably the ELF format defined as the standard binary interface that is used by application programs on operating systems that comply with the UNIX System V Interface Definition.

Claims

1. A method of executing an architecture-independent binary program on a computer, said method comprising the steps of:

(a) reading an object file containing object code;

(b) selecting a predetermined code portion of the object file;

(c) comparing the contents of a predetermined field within the code portion to a predetermined value to determine whether the object code is architecture-independent object code that requires interpretation; and

(d) if the object code requires interpretation, invoking an interpreter to interpret the object code.

2. The method of claim 1, said method further comprising the steps of:

e) extracting dynamic dependency information from the object file; and

f) providing the dynamic dependency information to the interpreter.

3. The method of claim 2 in which the object file comprises a data section and a dynamic section, said dynamic section identifying at least one library configured to provide additional object files to be executed by the interpreter.

4. The method of claim 3 in which the object file further comprises a string table, said string table including one or more strings, each of said strings identifying a library.

5. The method of claim 1 in which the object file is structured according to an industry-standard format.

6. The method of claim 3 in which the object file is structured according to the ELF file format.

7. The method of claim 1 in which the object file comprises a Java class file.

8. An apparatus for executing an architecture-independent binary program on a computer, comprising:

a) at least one processor;

b) a storage with a plurality of code segments stored thereon which are utilized by the processor to perform various functions, comprising;

i) a first code segment which reads an object file containing object code;

ii) a second code segment which selects a predetermined code portion of the object file;

iii) a third code segment which compares the contents of a predetermined field within the code portion to a predetermined value and determines whether the object code is architecture-independent object code that requires interpretation; and

iv) a fourth code segment which interprets the object code if the object code requires interpretation.

9. The apparatus of claim 8, said apparatus further comprising:

v) a fifth code segment utilized by the processor to extract dynamic dependency information from the object file; and

vi) a sixth code segment utilized by the processor to provide the dynamic dependency information to the interpreter.

10. The apparatus of claim 9 wherein the object file comprises a data section and a dynamic section, said dynamic section identifying at least one library configured to provide additional object files to be executed by the interpreter.

11. The apparatus of claim 10 in which the object file further comprises a string table, said string table including one or more strings, each of said strings identifying a library.

12. The apparatus of claim 8 wherein the object file conforms to an industry-standard format.

13. The apparatus of claim 12 wherein the object file conforms to the ELF file format.

14. The apparatus of claim 8 in which the object file comprises a Java class file.

15. A computer program product comprising a computer usable medium having computer readable code embodied therein for causing execution of an architecture-independent binary program on a computer, said computer program product comprising:

a) first software that reads an object file containing object code;

b) second software that selects a predetermined code portion of the object file;

c) third software that compares the contents of a predetermined field within the code portion to a predetermined value to determine whether the object code is architecture-independent object code that requires interpretation; and

d) fourth software that invokes an interpreter to interpret the object code if the object code requires interpretation.

16. The computer program product of claim 15, said computer program product further comprising:

e) fifth software that extracts dynamic dependency information from the object file; and

f) sixth software that provides the dynamic dependency information to the interpreter.

17. The computer program product of claim 16 wherein the object file comprises a data section and a dynamic section, said dynamic section identifying at least one library configured to provide additional object files to be executed by the interpreter.

18. The computer program product of claim 17 wherein the object file further comprises a string table, said string table including one or more strings, each of said strings identifying a library.

19. The computer program product of claim 15 wherein the object file conforms to an industry-standard format.

20. The computer program product of claim 19 wherein the object file conforms to the ELF file format.

21. The computer program product of claim 15 wherein the object file comprises a Java class file.