[GROOVY-11286] Extraneous bytecode generated after calls to void methods

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.5.23, 3.0.20, 5.0.0-alpha-4, 4.0.17
• Fix Version/s: 5.0.0-alpha-11
• Component/s: class generator, Compiler, Static compilation

Language

groovy

• Assignee: Eric Milles
• Reporter: Oscar N
• Created: 17/Jan/24 19:04
• Updated: 4 days ago 11:38
• Resolved: 11/Oct/24 19:27

Description

I have the following code:

package org.example

import groovy.transform.CompileStatic

@CompileStatic
final class Main {
    static void main(String[] args) {
        exampleMethod()
    }

    static void exampleMethod() {}
}

When looking at the compiled output, null is pushed to the stack then immediately popped:

// access flags 0x89
public static varargs main([Ljava/lang/String;)V
 L0
  LINENUMBER 8 L0
  INVOKESTATIC org/example/Main.exampleMethod ()V
  ACONST_NULL
  POP
 L1
  LINENUMBER 9 L1
  RETURN
  LOCALVARIABLE args [Ljava/lang/String; L0 L1 0
  MAXSTACK = 1
  MAXLOCALS = 1