[PATCH RFC v1 1/1] Initial support for Lua scripting

Dmitry V. Levin ldv at altlinux.org
Tue Jun 20 01:23:11 UTC 2017

On Mon, Jun 19, 2017 at 02:55:43AM +0300, Victor Krapivensky wrote:
> On Mon, Jun 19, 2017 at 12:36:41AM +0300, Dmitry V. Levin wrote:
> > Do we need so many different stringify macros?
> > Could we harmonize them somehow?
> Well, we can't just place them into defs.h because sysent.h, but not
> defs.h, is included by some tests/ files.
> We could move all the STRINGIFY/#ifdef FFI_CDEF/CONTENT stuff to a
> separate header. We would need to prefix them, though. I see two
> possibilities:
> 1. A header without include guards that #undef's all the previously
> defined macros, and defines new ones. Must be included whenever the
> CONTENT macro is used, and bad things will happen if one forgets to do
> so (old version of the macro will be used).
> 2. Further preprocessor black magic:
>     #ifndef STRACE_FFI_H
>     #define STRACE_FFI_H
>     #define FFI_STRINGIFY(...) #__VA_ARGS__
>     #define FFI_CONCAT(a, b)  a ## b
>     #define FFI_CONCAT2(a, b) FFI_CONCAT(a, b)
>     #define FFI_CONTENT_(...)         FFI_STRINGIFY(__VA_ARGS__)
>     #define FFI_CONTENT_FFI_CDEF(...) __VA_ARGS__
>     #endif /* !STRACE_FFI_H */
> Does not need to be re-included each time FFI_CDEF gets
> defined/undefined for FFI_CONTENT macro to work correctly.

I don't mind some preprocessor magic as well as a prefix, but FFI_ prefix
looks quite specific, while different parts of strace could benefit from
uniformly named STRINGIFY/STRINGIFY2 and CONCAT/CONCAT2 macros.

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