dereferencing type-punned pointer will break strict-aliasing rules

Thu Oct 12 09:53:00 GMT 2006

Tom Tromey writes:
 > >>>>> "Jack" == Jack Howarth <howarth@bromo.msbb.uc.edu> writes:
 > 
 > Jack> Has anyone noticed that we are breaking the strict-aliasing ruls in
 > Jack> natVMVirtualMachine.cc?
 > 
 > Jack> Does this merit a bug report or how else should it be handled?
 > 
 > Please file a bug report.
 > Or fix it if you prefer :-)
This evil is all over the place:
 JNIEnv *env;
 vm->GetEnv((void **)&env, JNI_VERSION_1_1);
[ FWIW, The JNI version of GetEnv looks like this:
Prototype jint GetEnv(JavaVM *vm, void **penv, jint interface_id);
Description If the current thread is not attached to the given virtual
machine instance, sets *penv to NULL, and returns JNI_EDETACHED. If
the specified interface is not supported, sets *penv to NULL, and
returns JNI_EVERSION. Otherwise, sets *env to the appropriate
interface, and returns JNI_OK. ]
We probably ned to go over the whole gcj tree and fix them all. :-(
Andrew.