RFR: 8035284: (xs) Remove redundant null initialization
mike.duigou at oracle.com
Fri Apr 11 20:04:15 UTC 2014
Apparently javac did at elide the "extraneous" null initialization at one point and it was deemed to have been contrary to point #4 of the procedure in JLS 12.5 (http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.5-220-D)
On Apr 11 2014, at 12:57 , Martin Buchholz <martinrb at google.com> wrote:
> It's surprising that javac does not eliminate the redundant initializations to null. Initializing to null has documentation value (suggesting that the constructor will not assign a value; null is a "valid" value). How about fixing javac instead?
> On Fri, Apr 11, 2014 at 12:22 PM, Mike Duigou <mike.duigou at oracle.com> wrote:
> Hello all;
> This is a simple cleanup changeset that removes redundant initialization of fields to null from a number of collection classes. These field initializations may seem cheap but they do have a cost:
> - For volatile fields there is a measurable cost on some benchmarks for these extra initializations.
> - Larger byte code in <init> methods.
> - For transient fields the initialization is misleading since it does not occur on deserialization.
> Redundant null initializations in other components/packages will be handled in separate issues.
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