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Posted to notifications@groovy.apache.org by "Eric Milles (Jira)" <ji...@apache.org> on 2021/10/16 13:48:00 UTC
[jira] [Updated] (GROOVY-10314) finally block produces long
sequence of nop instructions
[ https://issues.apache.org/jira/browse/GROOVY-10314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eric Milles updated GROOVY-10314:
---------------------------------
Labels: bytecode (was: )
> finally block produces long sequence of nop instructions
> --------------------------------------------------------
>
> Key: GROOVY-10314
> URL: https://issues.apache.org/jira/browse/GROOVY-10314
> Project: Groovy
> Issue Type: Bug
> Components: class generator, Compiler
> Reporter: Eric Milles
> Priority: Minor
> Labels: bytecode
>
> Consider the following:
> {code:groovy}
> def test() {
> try {
> print 'hello'
> } finally {
> print ' world'
> }
> }
> {code}
> For any non-void method where the {{try}}/{{finally}} is part of the return value, a long sequence of {{nop}} bytecode instructions is produced. The sample code from GROOVY-4721 produces 18 {{nop}} in a row.
> {code}
> // Method descriptor #42 ()Ljava/lang/Object;
> // Stack: 2, Locals: 3
> public java.lang.Object test();
> 0 aload_0 [this]
> 1 ldc <String "hello"> [47]
> 3 invokedynamic 1 invoke(Scratch, java.lang.String) : java.lang.Object [53]
> 8 astore_1
> 9 nop
> 10 aload_0 [this]
> 11 ldc <String " world"> [55]
> 13 invokedynamic 1 invoke(Scratch, java.lang.String) : java.lang.Object [53]
> 18 pop
> 19 nop
> 20 aload_1
> 21 areturn
> 22 nop
> 23 nop
> 24 athrow
> 25 nop
> 26 nop
> 27 nop
> 28 nop
> 29 nop
> 30 nop
> 31 nop
> 32 nop
> 33 athrow
> 34 nop
> 35 nop
> 36 athrow
> 37 astore_2
> 38 aload_0 [this]
> 39 ldc <String " world"> [55]
> 41 invokedynamic 1 invoke(Scratch, java.lang.String) : java.lang.Object [53]
> 46 pop
> 47 aload_2
> 48 athrow
> 49 nop
> 50 athrow
> Exception Table:
> [pc: 0, pc: 10] -> 37 when : any
> [pc: 20, pc: 22] -> 37 when : any
> Line numbers:
> [pc: 0, line: 3]
> [pc: 10, line: 5]
> [pc: 49, line: 7]
> Local variable table:
> [pc: 0, pc: 49] local: this index: 0 type: Scratch
> {code}
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