RFR (S) 8031818: Experimental VM flag for enforcing safe object construction (original) (raw)

Vladimir Kozlov vladimir.kozlov at oracle.com
Tue Jan 21 21:10:43 PST 2014

May be we should use bitset enums to record types of stores to fields. Next changes touch the same C2 code:

http://hg.openjdk.java.net/ppc-aix-port/stage-9/hotspot/rev/c6d7e7406136

It uses method()->is_initializer() instead of (method()->name() == ciSymbol::object_initializer_name()).

The main problem that new flag check will be executed always. It will not be optimized by C++.

Regards, Vladimir

On 1/21/14 2:47 PM, Aleksey Shipilev wrote:

Hi,

Please review the experimental patch for switching the research VM mode which unconditionally emits the memory barrier at the end of constructor: http://cr.openjdk.java.net/~shade/8031818/webrev.00/ https://bugs.openjdk.java.net/browse/JDK-8031818 This would be convenient to have in mainline, because it will also propagate to another arch ports (notably PPC C2 port), and will ease the performance research for the upcoming JMM update. Thanks, -Aleksey.

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