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Date: Thu, 06 Oct 2005 17:27:00 -0000
Subject: [Bug java/24242]  New: Redundant null pointer checks generated on refrerences returned by new operator.
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Message-ID: <bug-24242-7151@http.gcc.gnu.org/bugzilla/>
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To: java-prs@gcc.gnu.org
From: "daney at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
X-SW-Source: 2005-q4/txt/msg00052.txt.bz2
List-Id: <java-prs.sourceware.org>

When examining the assembler output (compiled with -O2) from this class:

public class T
{
    Object f1()
    {
        Object o = new Object();

        return o.getClass();
    }
}

We see a check for a null return value from _Jv_AllocObjectNoFinalizer (i.e.
the new operator).

However _Jv_AllocObjectNoFinalizer always returns non-null values.  On
out-of-memory it throws an OutOfMemoryError


-- 
           Summary: Redundant null pointer checks generated on refrerences
                    returned by new operator.
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: daney at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24242