Re: java/9861: method name mangling ignores return type

Re: java/9861: method name mangling ignores return type

[aph]

Synopsis: method name mangling ignores return type

State-Changed-From-To: open->analyzed
State-Changed-By: aph
State-Changed-When: Fri Apr 11 13:00:04 2003
State-Changed-Why:
    Ouch.  I don't see how we can fix this without breaking CNI
    compatibility with C++.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9861

java/9861: method name mangling ignores return type

[sf]

>Number:         9861
>Category:       java
>Synopsis:       method name mangling ignores return type
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 26 13:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     sf@b-i-t.de
>Release:        gcc-3.2.1
>Organization:
>Environment:
gentoo linux 1.4
gcc version 3.2.1 20021207 (Gentoo Linux 3.2.1-20021207)
GNU assembler version 2.13.90.0.18 (i586-pc-linux-gnu) using BFD version 2.13.90.0.18 20030121
>Description:
The following Generic Java code was compiled to the two classes which can be found in the attachment.

// TestGJ.java begins here

class Test<Type> {

  protected Type x () {
    return null;
  }
}

public class TestGJ extends Test<Integer> {

  protected Integer x () {
    return new Integer (1);
  }

  public static void main (final String[] argv) {
    new TestGJ ().x ().intValue ();
  }
}

// TestGJ.java ends here

If you execute "java TestGJ" (adjust CLASSPATH as necessary) the program runs without error (BTW, there is no output).

But compilation of the class files with gcj fails because of a name clash during assembly.
>How-To-Repeat:
If you execute

gcj -classpath /usr/share/gcc-data/i586-pc-linux-gnu/3.2/java/libgcj-3.2.1.jar:. Test.class TestGJ.class 

you should get output similar to

/tmp/cc5J7vu9.s: Assembler messages:
/tmp/cc5J7vu9.s:150: Error: symbol `_ZN6TestGJ1xEv' is already defined
>Fix:
The mangled name of a method must contain the method's return type, as in the definition of a method descriptor in the Java Virtual Machine Specification.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/x-zip-compressed; name="TestGJ.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="TestGJ.zip"

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