Testing and compiling hotspot

Radek rsmogura at gmail.com
Thu May 26 20:25:48 UTC 2016

Thank you Vladimir,

I have few other, descriptive questions, and I apologises for less strict questions.

I work on sharing memory in JVM, I have modified C1 and G1 (it works, but maybe I did something which I do not understand). Hotspot is pretty complicated, and there is a lot of ideas which are hard to be understand by code analyse.

I have two concerns: one is “state”, 2nd one is XHandlers.

I wonder for what purposes the “state” is used? I’ve seen that there is few places where state_for, and copy_state_* is used in LIR_Generator. My understanding is that this represents the state of VM before and after the given instruction. This state is expressed as “instructions” used to obtain given value. Than, I suppose, the state is transformed to registers which can be used by instructions, so last stack value can represent REG_X in state before, and REG_Y in state after (ie. state before field is loaded and after)? Am I right? Please free to correct me.

My 2nd question is about XHandlers. What XHandler actually is? Is this catch block? I’ve seen looking for XHandlers in signal block used to capture null references.

Thanks in advance,

> On 25 May 2016, at 18:48, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> Your command line looks correct. You don't need 'hotspot', just 'jdk' is enough - it will build hotspot too and put libjvm.so into built jdk.
> It takes time only for first build. If you change only hotspot after that the same command should be faster since only hotspot will be rebuilt.
> Vladimir
> On 5/25/16 7:40 AM, Radek wrote:
>> Dear all,
>> Please don’t kill me for asking less hotspot related question.
>> I working on hotspot code (memory management). In order to build and debug it I firstly build JDK with following command:
>> make CONF=linux-x86_64-normal-server-slowdebug JOBS=10 LOG=info hotspot jdk
>> This takes a bit of time. I tried to analyse make files to answer my question, but ….
>> I wonder if you know some magical combination of commands so,
>> - I can execute particular test,
>> - I can start JVM without building JDK.
>> Thanks in advance,
>> Radek

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