[Bug java/71917] [7 regression] libjava.jar/ReturnProxyTest.jar etc. FAIL

ebotcazou at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Tue Aug 30 13:04:00 GMT 2016


--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I'll certainly check on this but I did run the fix on both big and little
> endian MIPS which seems to suggest there isn't a double adjustment overall.

So this was broken in 64-bit big-endian too before your fix?

> Is there any definition for the raw API? I've seen some reference to
> arguments being passed 'in the way a java stack works' but am not sure how
> that relates to FFI return values passed in registers.

Unfortunately, no, the raw API is undocumented.  My understanding is that it's
an API that bypasses all the promotions/demotions stuff, at least for targets
that implement it natively (i.e. FFI_NATIVE_RAW_API defined, only x86 AFAICS). 
For other targets, java_raw_api.c contains the necessary glue code.  In
particular, you don't need to promote 32-bit return values to 64-bit ffi_arg
with it because both ffi_java_rvalue_to_raw and ffi_java_raw_to_rvalue do the
adjustments, at least in the 64-bit big-endian case.  There might be something
missing (an extension) for 64-bit little-endian for non-x86 targets.

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