[Bug gdb/31422] New: Replace gdb::array_view with std::span

[Bug gdb/31422] New: Replace gdb::array_view with std::span

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31422

            Bug ID: 31422
           Summary: Replace gdb::array_view with std::span
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

C++20 includes std::span.
We could rewrite gdb::array_view to work like std::span,
then use the standard one when it is available.

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[Bug gdb/31422] Replace gdb::array_view with std::span

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31422

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |31419

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Marking this as blocking c++17, even though it's somewhat
unrelated.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=31419
[Bug 31419] [meta] Convert GDB to C++17
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[Bug gdb/31422] Replace gdb::array_view with std::span

[simon.marchi at polymtl dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=31422

Simon Marchi <simon.marchi at polymtl dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simon.marchi at polymtl dot ca

--- Comment #2 from Simon Marchi <simon.marchi at polymtl dot ca> ---
If we want something compatible with std::span, we could use:

https://github.com/martinmoene/span-lite

I use it for another project, it works well.

Licence-wise, it's BSL (Boost), which GNU says is compatible with GPL, so it
shouldn't be a problem:

https://www.gnu.org/licenses/license-list.en.html#boost

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[Bug gdb/31422] Replace gdb::array_view with std::span

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31422

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
I have a patch for this, but really using std::span means
making even more changes, e.g.:

      if (dwarf2_evaluate_property (&prop, nullptr, &addr_stack, &result,
                                    {addr_stack.addr}))
        return (int) (result - addr_stack.addr);

../../binutils-gdb/gdb/gnu-v3-abi.c: In function ‘int
gnuv3_baseclass_offset(type*, int, const bfd_byte*, LONGEST, CORE_ADDR, const
value*)’:
../../binutils-gdb/gdb/gnu-v3-abi.c:495:36: error: could not convert
‘{addr_stack.property_addr_info::addr}’ from ‘<brace-enclosed initializer
list>’ to ‘gdb::span<long unsigned int>’ {aka ‘std::span<long unsigned int,
18446744073709551615>’}

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