[jboss-jira] [JBoss JIRA] Closed: (JASSIST-41) javassist.expr.NewExpr.replace(...) fails if created object is not assigned to variable

[Shigeru Chiba (JIRA)]

     [ http://jira.jboss.com/jira/browse/JASSIST-41?page=all ]

Shigeru Chiba closed JASSIST-41.
--------------------------------


> javassist.expr.NewExpr.replace(...) fails if created object is not assigned to variable
> ---------------------------------------------------------------------------------------
>
>                 Key: JASSIST-41
>                 URL: http://jira.jboss.com/jira/browse/JASSIST-41
>             Project: Javassist
>          Issue Type: Bug
>         Environment: Eclipse
>            Reporter: Martin Burger
>         Assigned To: Shigeru Chiba
>
> I implemented a ExprEditor that replaces new expressions. However, if the editor should replace a constructor call whose return value (the newly created object) is not assigned to a local variable, the method javassist.expr.NewExpr.canReplace(...) throws a CannotCompileException "sorry, cannot edit NEW followed by no DUP".
> The constructor has one parameter of type String, the method looks like that one:
> public void trigger() {
>     new C("some string");
> }
> In the byte code (Eclipse compiler) of the method that contains that constructor call is a LDC before the expected INVOKESPECIAL, so the method canReplace(...) fails:
> NEW C
> LDC "some string"
> INVOKESPECIAL C.<init>(Ljava/lang/String;)V
> If I add an assignment, there will be a DUP before the LDC:
> public void trigger() {
>     C c = new C("some string");
> }
> NEW C
> DUP
> LDC "some string"
> INVOKESPECIAL C.<init>(Ljava/lang/String;)V

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