[jboss-jira] [JBoss JIRA] Created: (JASSIST-135) Inconsistent interpretation of $0

[Thomas Mauch (JIRA)]

Inconsistent interpretation of $0
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                 Key: JASSIST-135
                 URL: https://jira.jboss.org/browse/JASSIST-135
             Project: Javassist
          Issue Type: Bug
    Affects Versions: 3.13.0.GA
            Reporter: Thomas Mauch
            Assignee: Shigeru Chiba


The interpretation of the variable $0 if a static method is involved is inconsistent in my opinion:

Section "4.1 Inserting source text at the beginning/end of a method body" states: "If the method is static, $0 is not available."
So you will get "javassist.CannotCompileException: [source error] no such field: $0" if try to use $0 for a static method.
This forces you to use if/then/else and to write two source code statements if you need to process instance and static methods in a uniform way.

But there is also a more relaxed interpretation of $0 which makes life easier:
Section "4.2 Altering a method body" states: "$0 is null if the method is static.".

So I would prefer to have $0 always available with a value of null if a static method is involved.

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