CONDITIONAL JUST-IN-TIME COMPILATION

• US 20150193212A1
• Filed: 03/24/2015
• Published: 07/09/2015
• Est. Priority Date: 02/18/2013
• Status: Active Grant

• Current Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Original Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Inventors: Elis, Filip, Nguyen, Filip
• Granted Patent: US 9,753,705 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 8/31 Programming languages or programming paradigms
• CPC Class Codes: G06F 8/41 Compilation
• CPC Class Codes: G06F 9/4552 Involving translation to a different instruction set architecture, e.g. just-in-time translation in a JVM

Abstract

A processor may perform conditional just-in-time (JIT) compilation. An example method may comprise: identifying, by the processor, a defined pattern in a byte stream derived from a high level programming language module; evaluating a conditional expression associated with the defined pattern, wherein the conditional expression comprises an execution platform identifier; and compiling the byte stream into a native code, while excluding, in view of the evaluating, a portion of byte stream associated with the defined pattern.

Claims

1. A method, comprising:

identifying, by a processor, a defined pattern in a byte stream derived from a high level programming language module;

evaluating a conditional expression associated with the defined pattern, wherein the conditional expression comprises an execution platform identifier; and

compiling the byte stream into a native code, while excluding, in view of the evaluating, a portion of byte stream associated with the defined pattern.

2. The method of claim 1, wherein the byte stream is provided by Java™

bytecode.

3. The method of claim 1, further comprising storing the native code in a memory for subsequent execution by the processor.

4. The method of claim 1, wherein the defined pattern comprises an opcode corresponding to a high-level programming language construct.

5. The method of claim 1, wherein the compiling is performed at run time.

6. The method of claim 1, wherein the conditional expression comprises an identifier of a system variable, an operator, and a constant value.

7. The method of claim 1, wherein evaluating the conditional expression comprises comparing the execution platform identifier to a system variable.

8. A non-transitory computer-readable storage medium comprising executable instructions to cause the processor to:

identify, by the processor, a defined pattern in a byte stream derived from a high level programming language module;

evaluate a conditional expression associated with the defined pattern, wherein the conditional expression comprises an execution platform identifier; and

compile the byte stream into a native code, while excluding, in view of the evaluating, a portion of byte stream associated with the defined pattern.

9. The non-transitory computer-readable storage medium of claim 8, wherein the byte stream is provided by Java™

bytecode.

10. The non-transitory computer-readable storage medium of claim 8, further comprising executable instructions causing the processor to store the native code in a memory for subsequent execution by the processor.

11. The non-transitory computer-readable storage medium of claim 8, wherein the defined pattern comprises an opcode corresponding to a high-level programming language construct.

12. The non-transitory computer-readable storage medium of claim 8, wherein the compiling is performed at run time.

13. The non-transitory computer-readable storage medium of claim 8, wherein the conditional expression comprises an identifier of a system variable, an operator, and a constant value.

14. The non-transitory computer-readable storage medium of claim 8, wherein the instructions causing the processor to evaluate the conditional expression comprise instructions causing the processor to compare the execution platform identifier to a system variable.

15. A system, comprising:

a memory; and

a processor, operatively coupled to the memory, the processor to;

identify a defined pattern in a byte stream derived from a high level programming language module;

evaluate a conditional expression associated with the defined pattern, wherein the conditional expression comprises an execution platform identifier; and

compile the byte stream into a native code, while excluding, in view of the evaluating, a portion of byte stream associated with the defined pattern.

16. The system of claim 15, wherein the byte stream is provided by Java™

bytecode.

17. The system of claim 15, wherein the processor is fighter to store the native code in a memory for subsequent execution by the processor.

18. The system of claim 15, wherein the defined pattern comprises an opcode corresponding to a high-level programming language construct.

19. The system of claim 15, wherein the conditional expression comprises an identifier of a system variable, an operator, and a constant value.

20. The system of claim 15, wherein to evaluate the conditional expression, the processor is to compare the execution platform identifier to a system variable.