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// Copyright (C) 2020-2025 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-rib.h"
#include "rust-name-resolution-context.h"
namespace Rust {
namespace Resolver2_0 {
Rib::Definition::Definition (NodeId id, Mode mode)
{
switch (mode)
{
case Mode::SHADOWABLE:
ids_shadowable.push_back (id);
return;
case Mode::NON_SHADOWABLE:
ids_non_shadowable.push_back (id);
return;
case Mode::GLOBBED:
ids_globbed.push_back (id);
return;
default:
gcc_unreachable ();
}
}
bool
Rib::Definition::is_ambiguous () const
{
if (!ids_shadowable.empty ())
return false;
else if (!ids_non_shadowable.empty ())
return ids_non_shadowable.size () > 1;
else
return ids_globbed.size () > 1;
}
std::string
Rib::Definition::to_string () const
{
std::stringstream out;
const char *headers[3] = {"(S)[", "] (NS)[", "] (G)["};
const std::vector<NodeId> *id_lists[3]
= {&ids_shadowable, &ids_non_shadowable, &ids_globbed};
for (int i = 0; i < 3; i++)
{
out << headers[i];
std::string sep;
for (auto id : *id_lists[i])
{
out << sep << id;
sep = ",";
}
}
out << "]";
return out.str ();
}
Rib::Definition
Rib::Definition::Shadowable (NodeId id)
{
return Definition (id, Mode::SHADOWABLE);
}
Rib::Definition
Rib::Definition::NonShadowable (NodeId id)
{
return Definition (id, Mode::NON_SHADOWABLE);
}
Rib::Definition
Rib::Definition::Globbed (NodeId id)
{
return Definition (id, Mode::GLOBBED);
}
DuplicateNameError::DuplicateNameError (std::string name, NodeId existing)
: name (name), existing (existing)
{}
Rib::Rib (Kind kind) : kind (kind) {}
Rib::Rib (Kind kind, std::string identifier, NodeId id)
: Rib (kind, {{identifier, id}})
{}
Rib::Rib (Kind kind, std::unordered_map<std::string, NodeId> to_insert)
: kind (kind)
{
for (auto &value : to_insert)
values.insert ({value.first, Definition::NonShadowable (value.second)});
}
tl::expected<NodeId, DuplicateNameError>
Rib::insert (std::string name, Definition def)
{
auto it = values.find (name);
if (it == values.end ())
{
/* No old value */
values[name] = def;
}
else if (it->second.ids_non_shadowable.empty ()
|| def.ids_non_shadowable.empty ())
{ /* No non-shadowable conflict */
auto ¤t = values[name];
for (auto id : def.ids_non_shadowable)
{
if (std::find (current.ids_non_shadowable.cbegin (),
current.ids_non_shadowable.cend (), id)
== current.ids_non_shadowable.cend ())
current.ids_non_shadowable.push_back (id);
else
// TODO: should this produce an error?
return tl::make_unexpected (DuplicateNameError (name, id));
}
for (auto id : def.ids_shadowable)
{
if (std::find (current.ids_shadowable.cbegin (),
current.ids_shadowable.cend (), id)
== current.ids_shadowable.cend ())
current.ids_shadowable.push_back (id);
else
// TODO: should this produce an error?
return tl::make_unexpected (DuplicateNameError (name, id));
}
for (auto id : def.ids_globbed)
{
if (std::find (current.ids_globbed.cbegin (),
current.ids_globbed.cend (), id)
== current.ids_globbed.cend ())
current.ids_globbed.push_back (id);
else
// TODO: should this produce an error?
return tl::make_unexpected (DuplicateNameError (name, id));
}
}
else /* Multiple non-shadowable */
{
return tl::make_unexpected (
DuplicateNameError (name, it->second.ids_non_shadowable.back ()));
}
if (!def.ids_shadowable.empty ())
return def.ids_shadowable.back ();
else if (!def.ids_non_shadowable.empty ())
return def.ids_non_shadowable.back ();
rust_assert (!def.ids_globbed.empty ());
return def.ids_globbed.back ();
}
tl::optional<Rib::Definition>
Rib::get (const std::string &name)
{
auto it = values.find (name);
if (it == values.end ())
return tl::nullopt;
return it->second;
}
const std::unordered_map<std::string, Rib::Definition> &
Rib::get_values () const
{
return values;
}
} // namespace Resolver2_0
} // namespace Rust
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