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Pedro Alves 8c4f70ffe7 enum_flags to_string 
This commit introduces shared infrastructure that can be used to
implement enum_flags -> to_string functions.  With this, if we want to
support converting a given enum_flags specialization to string, we
just need to implement a function that provides the enumerator->string
mapping, like so:

 enum some_flag
   {
     SOME_FLAG1 = 1 << 0,
     SOME_FLAG2 = 1 << 1,
     SOME_FLAG3 = 1 << 2,
   };

 DEF_ENUM_FLAGS_TYPE (some_flag, some_flags);

 static std::string
 to_string (some_flags flags)
 {
   static constexpr some_flags::string_mapping mapping[] = {
     MAP_ENUM_FLAG (SOME_FLAG1),
     MAP_ENUM_FLAG (SOME_FLAG2),
     MAP_ENUM_FLAG (SOME_FLAG3),
   };
   return flags.to_string (mapping);
 }

.. and then to_string(SOME_FLAG2 | SOME_FLAG3) produces a string like
"0x6 [SOME_FLAG2 SOME_FLAG3]".

If we happen to forget to update the mapping array when we introduce a
new enumerator, then the string representation will pretty-print the
flags it knows about, and then the leftover flags in hex (one single
number).  For example, if we had missed mapping SOME_FLAG2 above, we'd
end up with:

  to_string(SOME_FLAG2 | SOME_FLAG3)  => "0x6 [SOME_FLAG2 0x4]");

Other than in the unit tests included, no actual usage of the
functionality is added in this commit.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I835de43c33d13bc0c95132f42c3f97318b875779
2023-01-30 15:03:55 -05:00
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acinclude.m4 gdb: don't use -Wmissing-prototypes with g++ 2022-01-13 10:25:45 +00:00
aclocal.m4 gdb: use AC_PROG_CC_STDC instead of AM_PROG_CC_STDC 2020-10-31 08:30:57 -04:00
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ChangeLog-2020-2021 gdb: move remaining ChangeLogs to legacy files 2021-07-26 12:20:33 +01:00
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common-debug.h gdbsupport: fix scoped_debug_start_end's move constructor 2023-01-05 15:18:11 -05:00
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common-utils.h gdbsupport: add gdb::string_view_hash 2023-01-05 14:38:51 -05:00
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enum-flags.h enum_flags to_string 2023-01-30 15:03:55 -05:00
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README
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README 

This is a helper library that is used by gdb and gdbserver.

To send patches, follow the gdb patch submission instructions in
../gdb/CONTRIBUTE.  For maintainers, see ../gdb/MAINTAINERS.