RFR: 8255766: Fix linux+arm64 build after 8254072

[Vladimir Kozlov]

On Mon, 2 Nov 2020 17:58:02 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> A recently introduced checked cast[1] looks to be useful here, it would allow to remove the ad-hoc assert.
>> 
>> [1] https://github.com/openjdk/jdk/commit/3302d3adb5fbd5729c1677d927dd4c8af1c428a4
>
> diff --git a/src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp b/src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp
> index eb6195fd675..92a07a84d2a 100644
> --- a/src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp
> +++ b/src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp
> @@ -1498,8 +1498,7 @@ nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
>  
>    // Generate stack overflow check
>    if (UseStackBanging) {
> -    assert(StackOverflow::stack_shadow_zone_size() == (int)StackOverflow::stack_shadow_zone_size(), "must be same");
> -    __ bang_stack_with_offset((int)StackOverflow::stack_shadow_zone_size());
> +    __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
>    } else {
>      Unimplemented();
>    }

I like Andrew's proposal. It is more clean. Let me test it too.

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PR: https://git.openjdk.java.net/jdk/pull/1013