[jboss-jira] [JBoss JIRA] (JASSIST-260) Stack frame corruption after writing to attribute on injected after method

[Rafael Campos (JIRA)]

     [ https://issues.jboss.org/browse/JASSIST-260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rafael Campos updated JASSIST-260:
----------------------------------
    Steps to Reproduce: 
Stack frame corruption after writing to attribute contain on class that contains method with injected code via 
{code:java}
CtMethod.insertAfter(String src)
{code}
This writing happens inside of the injected code src it self.



Example:

{code:java}
public class Animal {
	public String ret;
	public AnimalRoles(){
          ret = "Before";
        }
	public String hello() {
		return ret;
	}
	public String die(String age) {
		return "";
	}
}
{code}

{code:java}
// Somehow get the method hello from Animal into a var name methodHello
method.insertAfter("this.ret = \"After\";");
{code}

{code:java}
// Call the method hello in a fresh Animal instance
Animal a = new Animal();
System.out.println(a.hello());
System.out.println(a.ret);
{code}





Result:
Before
After

Expected:
After
After





Debugging the program a in the method hello it is possible to observe the following message:

"com.sun.jdi.InternalException: Got error code in repIy:35 occurred retrieving ‘this' from stack frame."

!Image1.png|thumbnail!



Tried several work around but basically the problem is that the newly written that can not be read at the return statement. No workaround found so far.




Also tested with previous versions of javaassist from 3.12.1.GA until 3.20.0GA and all yield the same result.

  was:
Stack frame corruption after writing to attribute contain on class that contains method with injected code via 
{code:java}
CtMethod.insertAfter(String src)
{code}
This writing happens inside of the injected code src it self.



Example:

{code:java}
public class Animal {
	public String ret;
	public AnimalRoles(){
          ret = "Before";
        }
	public String hello() {
		return ret;
	}
	public String die(String age) {
		return "";
	}
}
{code}

{code:java}
// Somehow get the method hello from Animal into a var name methodHello
method.insertAfter("this.ret = \"After\";");
{code}

{code:java}
// Call the method hello in a fresh Animal instance
Animal a = new Animal();
System.out.println(a.hello());
System.out.println(a.ret);
{code}





Result:
Before
After

Expected:
After
After





Debugging the program a in the method hello it is possible to observe the following message:

!Image1.png|thumbnail!


Also tested with previous versions of javaassist from 3.12.1.GA until 3.20.0GA and all yield the same result.



> Stack frame corruption after writing to attribute on injected after method
> --------------------------------------------------------------------------
>
>                 Key: JASSIST-260
>                 URL: https://issues.jboss.org/browse/JASSIST-260
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.20.0-GA
>         Environment: Using java 1.8, also tested with java 1.7 same behavior on eclipse Version: Mars.1 Release (4.5.1) on windows 7 x64 bits.
>            Reporter: Rafael Campos
>            Assignee: Shigeru Chiba
>            Priority: Minor
>         Attachments: Image1.png
>
>




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