RFR: 8262328: Templatize JVMFlag boilerplate access methods

[Ioi Lam]

On Thu, 1 Apr 2021 22:44:34 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> We have a bunch of boilerplate method like:
> 
> JVMFlagAccess::boolAtPut (JVMFlag* f, bool* v, JVMFlagOrigin origin)
> JVMFlagAccess::intAtPut (JVMFlag* f, int* v, JVMFlagOrigin origin)
> JVMFlagAccess::uintAtPut (JVMFlag* f, uint* v, JVMFlagOrigin origin)
> ...
> 
> Similarly, we also have 8 different functions: JVMFlag::{set_bool, set_int, set_intx, ...}
> 
> We should replace such patterns with
> 
> template <typename T>
> JVMFlagAccess::set(JVMFlag* f, T* value, JVMFlagOrigin origin)
> 
> This would allow us to templatize the 8x boilerplate functions in writeableFlags.cpp.
> 
> The flag access code in whitebox.cpp can also be improved.

I need to work on this PR some more. Closing it for now.

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PR: https://git.openjdk.java.net/jdk/pull/3318