On Tue, 8 Mar 2022 19:26:41 GMT, Chris Plummer wrote:
>> jdb has 3 types of arguments:
>>
>> 1. Those that are jdb specific, such as -attach, -launch, and -listconnectors
>> 2. Those that are passed to the JVM used to run jdb. These are all prefixed
>> with -J, and any valid JVM argument can be
On Fri, 4 Mar 2022 17:12:51 GMT, Alex Menkov wrote:
>> JDK-8238048 (fixed in jdk15) moved major_version, minor_version,
>> generic_signature_index and source_file_name_index from InstanceKlass to
>> ConstantPool.
>> We still have some incorrect code in CP merge during class redefinition.
>>
>>
On Tue, 8 Mar 2022 19:26:41 GMT, Chris Plummer wrote:
>> jdb has 3 types of arguments:
>>
>> 1. Those that are jdb specific, such as -attach, -launch, and -listconnectors
>> 2. Those that are passed to the JVM used to run jdb. These are all prefixed
>> with -J, and any valid JVM argument can be
On Thu, 10 Mar 2022 14:09:24 GMT, Anton Kozlov wrote:
> > Depending on what the pthread library call does, and if it's a real
> > function call into a library, it would be more expensive than that.
>
> Yes, unfortunately we need something like this.
But we don't need to speculate. If thread-lo
On Fri, 11 Mar 2022 09:33:40 GMT, Andrew Haley wrote:
> But we don't need to speculate. If thread-local variables are cheap on MacOS,
> and there is no reason why they should be expensive, then we can stop
> worrying and just use a thread-local variable for WX state. We can measure
> how long
On Fri, 11 Mar 2022 09:33:40 GMT, Andrew Haley wrote:
> We could also redefine SafeFetch on MacOS/AArch64 to not need WX. We could do
> this by statically generating SafeFetch on that platform, and it wouldn't be
> in the JIT region at all. Why not just do that?
Do you mean using inline assemb
On Fri, 11 Mar 2022 07:52:16 GMT, Johannes Bechberger
wrote:
>> The WXMode for the current thread (on MacOS aarch64) is currently stored in
>> the thread class which is unnecessary as the WXMode is bound to the current
>> OS thread, not the current instance of the thread class.
>> This pull re
On Fri, 11 Mar 2022 10:27:25 GMT, Andrew Haley wrote:
> On 3/11/22 10:12, Thomas Stuefe wrote: We could also redefine SafeFetch on
> MacOS/AArch64 to not need WX. We could do this by statically generating
> SafeFetch on that platform, and it wouldn't be in the JIT region at all. Why
> not just
On Fri, 11 Mar 2022 09:50:22 GMT, Johannes Bechberger
wrote:
> According to
> https://forums.swift.org/t/concurrencys-use-of-thread-local-variables/48654:
> "these accesses are just a move from a system register plus a load/store at a
> constant offset."
Ideally you'd still benchmark that. S
On Thu, 10 Mar 2022 17:55:44 GMT, Alisen Chung wrote:
>> msg drop for jdk19, Mar 9, 2022
>
> Alisen Chung has updated the pull request incrementally with one additional
> commit since the last revision:
>
> moved CurrencyNames changes to jdk.localedata
The security related changes look fine,
On Thu, 10 Mar 2022 18:07:37 GMT, Thomas Stuefe wrote:
> > > > Is it possible to change SafeFetch only? Switch to WXExec before
> > > > calling the stub and switch WXWrite back unconditionally? We won't need
> > > > to provide assert in ThreadWXEnable. But SafeFetch can check the
> > > > assum
On Thu, 10 Mar 2022 18:04:50 GMT, Thomas Stuefe wrote:
> blocking SIGSEGV and SIGBUS - or other synchronous error signals like SIGFPE
> - and then triggering said signal is UB. What happens is OS-dependent. I saw
> processes vanishing, or hang, or core. It makes sense, since what is the
> kern
On Tue, 8 Mar 2022 19:26:41 GMT, Chris Plummer wrote:
>> jdb has 3 types of arguments:
>>
>> 1. Those that are jdb specific, such as -attach, -launch, and -listconnectors
>> 2. Those that are passed to the JVM used to run jdb. These are all prefixed
>> with -J, and any valid JVM argument can be
On Fri, 11 Mar 2022 07:52:16 GMT, Johannes Bechberger
wrote:
>> The WXMode for the current thread (on MacOS aarch64) is currently stored in
>> the thread class which is unnecessary as the WXMode is bound to the current
>> OS thread, not the current instance of the thread class.
>> This pull re
On Fri, 11 Mar 2022 16:34:29 GMT, Anton Kozlov wrote:
> > blocking SIGSEGV and SIGBUS - or other synchronous error signals like
> > SIGFPE - and then triggering said signal is UB. What happens is
> > OS-dependent. I saw processes vanishing, or hang, or core. It makes sense,
> > since what is t
On Fri, 11 Mar 2022 10:44:25 GMT, Thomas Stuefe wrote:
> > On 3/11/22 10:12, Thomas Stuefe wrote: We could also redefine SafeFetch on
> > MacOS/AArch64 to not need WX. We could do this by statically generating
> > SafeFetch on that platform, and it wouldn't be in the JIT region at all.
> > Why
> jdb has 3 types of arguments:
>
> 1. Those that are jdb specific, such as -attach, -launch, and -listconnectors
> 2. Those that are passed to the JVM used to run jdb. These are all prefixed
> with -J, and any valid JVM argument can be passed in this manner.
> 3. Those that are passed to the deb
On Sun, 6 Mar 2022 20:35:04 GMT, Alan Bateman wrote:
>>> `jshell --enable-preview` allows developers to use preview features in the
>>> REPL, having `jdb --enable-preview` and passing it through to the launching
>>> debugee would be useful too.
>>
>> Is that the same as `-R--enable-preview` or
On Sat, 12 Mar 2022 05:44:21 GMT, Chris Plummer wrote:
>> jdb has 3 types of arguments:
>>
>> 1. Those that are jdb specific, such as -attach, -launch, and -listconnectors
>> 2. Those that are passed to the JVM used to run jdb. These are all prefixed
>> with -J, and any valid JVM argument can b
On Fri, 11 Mar 2022 23:40:36 GMT, Thomas Stuefe wrote:
> I spent some time doing a static implementation of SafeFetch on Linux x64,
> and its not super trivial. The problem is that we need to know addresses of
> instructions inside that function. I can set labels in assembly, and I can
> expor
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