RFR: thaw_kind cleanup

[Ron Pressler]

On Wed, 27 Apr 2022 18:36:19 GMT, Frederic Parain <fparain at openjdk.org> wrote:

> In continuationFreezeThaw.cpp, the following enum is declared:
> enum thaw_kind {
>   thaw_top = 0,
>   thaw_return_barrier = 1,
>   thaw_exception = 2,
> };
> 
> thaw_kind being declared in a .cpp file, it cannot be exported to other files. The consequence of that is that in the assembly code preparing the argument for the thaw() method, hard coded values are used instead of values from the enum:
>     if (exception)           __ movl(c_rarg1, (int32_t)2);
>     else if (return_barrier) __ movl(c_rarg1, (int32_t)1);
>     else                     __ movl(c_rarg1, (int32_t)0);
> 
> The fix is to move the declaration of thaw_kind to continuation.hpp and use it everywhere instead of using hard coded values.
> 
> Tested with Loom test, tier 1 to 5.
> 
> Thank you,
> 
> Fred

Marked as reviewed by rpressler (Lead).

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PR: https://git.openjdk.java.net/loom/pull/174