RFR: 8256486: Linux/Windows-x86 builds broken after JDK-8254231 [v7]

[David Holmes]

On Wed, 25 Nov 2020 12:09:07 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> JDK-8254231 breaks the Linux and Windows x86 (32-bit) builds. This contains the needed changes to get it working again.
>> 
>> Perhaps the most interesting change is adding the `JNI_ENTRY_CPP_NOENV` macro. Using just JNI_ENTRY was causing a linkage failure, due to the declaration of the function in the class not having the same linkage specifiers. It looks like we can't just specify C linkage for class member functions.
>> 
>> However, in this case C linkage is not required, so I've added the new macro which doesn't have `extern "C"`. I've also dropped the `JNIEnv*` parameter, since it was not being used, but causing extra work for the caller.
>> 
>> Other than that, it's just about adding default definitions for missing functions, and moving around some code in MacroAssembler to be in the correct `#ifdef` blocks.
>> 
>> Testing: `make images` on Linux and Windows x86_32 platforms.
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Pass in thread instead of rematerializing it.

src/hotspot/share/prims/universalUpcallHandler.cpp line 37:

> 35: 
> 36: void ProgrammableUpcallHandler::upcall_helper(JavaThread* thread, jobject rec, address buff) {
> 37:   JavaThread* THREAD = thread;

You could have just named the parameter THREAD.

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PR: https://git.openjdk.java.net/jdk/pull/1266