Conditional compilation of bytecode

• US 9,753,705 B2
• Filed: 03/24/2015
• Issued: 09/05/2017
• 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: Eli{hacek over (s)}, Filip, Nguyen, Filip
• Primary Examiner(s): Zhen, Wei
• Assistant Examiner(s): MORSHED, HOSSAIN M
• Application Number:
  US14/666,669
• Publication Number:
  US 20150193212A1
• Time in Patent Office: 896 Days
• Field of Search: 717140, 717146, 717147, 717148, 717151, 717153
• 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 bytecode derived from a high level programming language module;

evaluating, by the processor, a conditional expression associated with the defined pattern, wherein the conditional expression comprises a symbolic name of a system property of the high level programming language, an operator, and an identifier of an execution platform;

excluding from a scope of compilation, in view of the evaluating, a portion of bytecode associated with the defined pattern, wherein the portion comprises code exploiting execution platform-specific capabilities; and

compiling, in view of the scope of compilation, the bytecode into a native code.

2. The method of claim 1, wherein the high level programming language is provided by Java™

programming language.

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 evaluating the conditional expression comprises comparing the execution platform identifier value to a value of the system property symbolic name.

7. The method of claim 1, wherein the symbolic name of the system property is provided by a Java™

system property symbolic name.

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

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

evaluate, by the processor, a conditional expression associated with the defined pattern, wherein the conditional expression comprises a symbolic name of a system property of the high level programming language, an operator, and a an identifier of an execution platform;

exclude from a scope of compilation, in view of the evaluating, a portion of bytecode associated with the defined pattern, wherein the portion comprises code exploiting execution platform-specific capabilities; and

compile, in view of the scope of compilation, the bytecode into a native code.

9. The non-transitory computer-readable storage medium of claim 8, wherein the high level programming language is provided by Java™

programming language.

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 Instructions causing the processor to evaluate the conditional expression comprise instructions causing the processor to compare the execution platform identifier value to a value of the system property symbolic name.

14. A system, comprising:

a memory; and

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

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

evaluate a conditional expression associated with the defined pattern, wherein the conditional expression comprises a symbolic name of a system property of the high level programming language, an operator, and an identifier of an execution platform;

exclude from a scope of compilation, in view of the evaluating, a portion of bytecode associated with the defined pattern, wherein the portion comprises code exploiting execution platform-specific capabilities; and

compile, in view of the scope of compilation, the bytecode into a native code.

15. The system of claim 14, wherein the high level programming language is provided by Java™

programming language.

16. The system of claim 14, wherein the processor is further to store the native code in a memory for subsequent execution by the processor.

17. The system of claim 14, wherein the defined pattern comprises an opcode corresponding to a high-level programming language construct.

18. The system of claim 14, wherein to evaluate the conditional expression, the processor is to compare the execution platform identifier value to a value of the system property symbolic name.