Hi, I see you and Laszlo are still in discussion on GCC behavior. Because there is one bug in GCC compiler, the following functions in edk2 must be EFIAPI. Right?
- functions that have a variable argument list and call VA_START / VA_END - functions that call VA_COPY Thanks Liming > -----Original Message----- > From: Zenith432 [mailto:zenith...@users.sourceforge.net] > Sent: Sunday, December 10, 2017 11:43 PM > To: Gao, Liming <liming....@intel.com>; edk2-devel@lists.01.org > Cc: Kinney, Michael D <michael.d.kin...@intel.com> > Subject: Re: [PATCH] MdePkg: correct and clarify documentation of VA_LIST in > Base.h > > On 10/12/2017 03:53 PM, Gao, Liming wrote: > > Could you add bug 457 link in the commit message? > --- > Subject: [PATCH] MdePkg: correct and clarify documentation of VA_LIST in > Base.h > > This is to resolve bug 457. > https://bugzilla.tianocore.org/show_bug.cgi?id=457 > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Zenith432 <zenith432 at users.sourceforge.net> > --- > MdePkg/Include/Base.h | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h > index 02140a5a..19f36872 100644 > --- a/MdePkg/Include/Base.h > +++ b/MdePkg/Include/Base.h > @@ -560,13 +560,14 @@ struct _LIST_ENTRY { > // VA_LIST - typedef for argument list. > // VA_START (VA_LIST Marker, argument before the ...) - Init Marker for > use. > // VA_END (VA_LIST Marker) - Clear Marker > -// VA_ARG (VA_LIST Marker, var arg size) - Use Marker to get an argument > from > -// the ... list. You must know the size and pass it in this macro. > +// VA_ARG (VA_LIST Marker, var arg type) - Use Marker to get an argument > from > +// the ... list. You must know the type and pass it in this macro. > // VA_COPY (VA_LIST Dest, VA_LIST Start) - Initialize Dest as a copy of > Start. > // > -// example: > +// Example: > // > // UINTN > +// EFIAPI > // ExampleVarArg ( > // IN UINTN NumberOfArgs, > // ... > @@ -582,7 +583,7 @@ struct _LIST_ENTRY { > // VA_START (Marker, NumberOfArgs); > // for (Index = 0, Result = 0; Index < NumberOfArgs; Index++) { > // // > -// // The ... list is a series of UINTN values, so average them up. > +// // The ... list is a series of UINTN values, so sum them up. > // // > // Result += VA_ARG (Marker, UINTN); > // } > @@ -591,6 +592,21 @@ struct _LIST_ENTRY { > // return Result > // } > // > +// Notes: > +// > +// This set of macros is intended to support variadic functions that > +// use the EFIAPI calling convention. Variadic functions that use a > +// native calling convention should use stdarg.h. > +// In particular: > +// -- VA_START may only be used in a variadic EFIAPI function. > +// -- va_start may only be used in a variadic native function. > +// -- VA_START, VA_END, VA_ARG and VA_COPY may only be used on a VA_LIST. > +// -- va_start, va_end, va_arg and va_copy may only be used on a va_list. > +// -- Both VA_LIST or va_list may be passed as arguments to functions > +// of either EFIAPI or native calling conventions. > +// -- VA_END, VA_ARG, VA_COPY, va_end, va_arg, and va_copy may be used > +// in functions of either calling conventions. > +// > > /** > Return the size of argument that has been aligned to sizeof (UINTN). > -- > 2.14.3 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
