Re: [Sablevm-developer] reflection methods

[David P. B. <db...@CS...>]

Hello,

I got several methods somewhat working and I also came up with
questions/issues.=20

Here are the first few:

1) All the native Class methods: Class.m(JNIEnv *_env, jobject
this) already implemented does a segmentation fault at:

_svmt_type_info *type =3D _svmf_unwrap_class_instance (env, this)

if the Class object represents a primitive (ex: int.class).

Example: int.class.getSuperclass() (but it applies to several) crashes
instead of returning null.  (Note: getSuperclass() has other bugs, but I
fixed them.).

I am fixing this by simply checking if it represents a primitive type in
Class.java and calling the native function only if does not.  This
avoid "switching" to native mode for primitive types.  I am not
sure if _svmf_unwrap_class_instance was designed with that assumption
in mind or if this is a bug.

2) I changed one of the native declaration:

from:
JNIEXPORT jint JNICALL Java_java_lang_reflect_Method_getModifiers(JNIEnv
*, jobject);
to:
JNIEXPORT jint JNICALL
Java_java_lang_reflect_Method_nativeGetModifiers(JNIEnv *, jclass,
jbyteArray);

This makes it look similar in prototype to the others and simplifies the
implementation.

This may be a Classpath bug.



David


On Sun, Jan 26, 2003 at 10:55:28AM -0500, David Paul BELANGER wrote:
>=20
> Hello,
>=20
> I volunteered to help implement the native methods in the reflection
> classes (java.lang.Class and classes in java.lang.reflect).
> These include methods such as Class.getMethods() that have
> been asked a few times on this list.
>=20
> My short term goal is to implement enough methods to run Ant and JUnit
> as soon as possible.
>=20
> I have a partially working getMethods().  I will made my code public as
> soon as a have a reasonable set of working functions.
>=20
>=20
> David
>=20
>=20
> ---
>=20
> David B=E9langer
> Graduate Student
> School of Computer Science
> McGill University
> Office: MC226
>=20
> Web page:   http://www.cs.mcgill.ca/~dbelan2/
> Public key: http://www.cs.mcgill.ca/~dbelan2/public_key.txt
>=20
>=20
>=20
> -------------------------------------------------------
> This SF.NET email is sponsored by:
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--=20

---

David B=E9langer
Graduate Student
School of Computer Science
McGill University
Office: MC226

Web page:   http://www.cs.mcgill.ca/~dbelan2/
Public key: http://www.cs.mcgill.ca/~dbelan2/public_key.txt