Why does GCJ generate so many explicit checks for null pointers?

Tue Jul 29 10:46:00 GMT 2003

Jeff Sturm writes:
 > On 2003年7月28日, David Daney wrote:
 > > Why check before the constructor call? Is it ever possible for
 > > _Jv_AllocObjectNoFinalizer to return null?
 > 
 > No, but the backend optimizers don't know that, or else DCE would
 > eliminate the test.
 > Currently only a few java-specific optimizations are done by gcj.
Null pointer check elimination isn't really Java specific. 
The plan is to do this optimization in tree-SSA. With that framework
it isn't very difficult.
Andrew.