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// Copyright (C) 2020-2022 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-ast-resolve.h"
#include "rust-ast-full.h"
#include "rust-tyty.h"
#include "rust-ast-resolve-toplevel.h"
#include "rust-ast-resolve-item.h"
#include "rust-ast-resolve-expr.h"
#include "rust-ast-resolve-struct-expr-field.h"
extern bool
saw_errors (void);
namespace Rust {
namespace Resolver {
// NameResolution
NameResolution *
NameResolution::get ()
{
static NameResolution *instance;
if (instance == nullptr)
instance = new NameResolution ();
return instance;
}
NameResolution::NameResolution ()
: resolver (Resolver::get ()), mappings (Analysis::Mappings::get ())
{
// these are global
resolver->get_type_scope ().push (mappings->get_next_node_id ());
resolver->insert_builtin_types (resolver->get_type_scope ().peek ());
resolver->push_new_type_rib (resolver->get_type_scope ().peek ());
}
void
NameResolution::Resolve (AST::Crate &crate)
{
auto resolver = get ();
resolver->go (crate);
}
void
NameResolution::go (AST::Crate &crate)
{
// lookup current crate name
CrateNum cnum = mappings->get_current_crate ();
std::string crate_name;
bool ok = mappings->get_crate_name (cnum, crate_name);
rust_assert (ok);
// setup the ribs
NodeId scope_node_id = crate.get_node_id ();
resolver->get_name_scope ().push (scope_node_id);
resolver->get_type_scope ().push (scope_node_id);
resolver->get_label_scope ().push (scope_node_id);
resolver->push_new_name_rib (resolver->get_name_scope ().peek ());
resolver->push_new_type_rib (resolver->get_type_scope ().peek ());
resolver->push_new_label_rib (resolver->get_type_scope ().peek ());
// get the root segment
CanonicalPath crate_prefix
= CanonicalPath::new_seg (scope_node_id, crate_name);
crate_prefix.set_crate_num (cnum);
// setup a dummy crate node
resolver->get_name_scope ().insert (
CanonicalPath::new_seg (crate.get_node_id (), "__$$crate__"),
crate.get_node_id (), Location ());
// setup the root scope
resolver->push_new_module_scope (scope_node_id);
// first gather the top-level namespace names then we drill down so this
// allows for resolving forward declarations since an impl block might have
// a Self type Foo which is defined after the impl block for example.
for (auto it = crate.items.begin (); it != crate.items.end (); it++)
ResolveTopLevel::go (it->get (), CanonicalPath::create_empty (),
crate_prefix);
// FIXME remove this
if (saw_errors ())
{
resolver->pop_module_scope ();
return;
}
// next we can drill down into the items and their scopes
for (auto it = crate.items.begin (); it != crate.items.end (); it++)
ResolveItem::go (it->get (), CanonicalPath::create_empty (), crate_prefix);
// done
resolver->pop_module_scope ();
}
// rust-ast-resolve-struct-expr-field.h
void
ResolveStructExprField::visit (AST::StructExprFieldIdentifierValue &field)
{
ResolveExpr::go (field.get_value ().get (), field.get_node_id (), prefix,
canonical_prefix);
}
void
ResolveStructExprField::visit (AST::StructExprFieldIndexValue &field)
{
ResolveExpr::go (field.get_value ().get (), field.get_node_id (), prefix,
canonical_prefix);
}
void
ResolveStructExprField::visit (AST::StructExprFieldIdentifier &field)
{
AST::IdentifierExpr expr (field.get_field_name (), {}, field.get_locus ());
expr.set_node_id (field.get_node_id ());
ResolveExpr::go (&expr, field.get_node_id (), prefix, canonical_prefix);
}
// rust-ast-resolve-item.h
void
ResolveItem::resolve_impl_item (AST::TraitImplItem *item,
const CanonicalPath &prefix,
const CanonicalPath &canonical_prefix)
{
ResolveImplItems::go (item, prefix, canonical_prefix);
}
void
ResolveItem::resolve_impl_item (AST::InherentImplItem *item,
const CanonicalPath &prefix,
const CanonicalPath &canonical_prefix)
{
ResolveImplItems::go (item, prefix, canonical_prefix);
}
void
ResolveItem::resolve_extern_item (AST::ExternalItem *item)
{
ResolveExternItem::go (item);
}
// qualified path in type
bool
ResolveRelativeTypePath::resolve_qual_seg (AST::QualifiedPathType &seg,
CanonicalPath &result)
{
if (seg.is_error ())
{
rust_error_at (seg.get_locus (), "segment has error: %s",
seg.as_string ().c_str ());
return false;
}
auto type = seg.get_type ().get ();
NodeId type_resolved_node = ResolveType::go (type, seg.get_node_id ());
if (type_resolved_node == UNKNOWN_NODEID)
return false;
const CanonicalPath *impl_type_seg = nullptr;
bool ok
= mappings->lookup_canonical_path (mappings->get_current_crate (),
type_resolved_node, &impl_type_seg);
rust_assert (ok);
if (!seg.has_as_clause ())
{
result = result.append (*impl_type_seg);
return true;
}
NodeId trait_resolved_node
= ResolveType::go (&seg.get_as_type_path (), seg.get_node_id ());
if (trait_resolved_node == UNKNOWN_NODEID)
return false;
const CanonicalPath *trait_type_seg = nullptr;
ok = mappings->lookup_canonical_path (mappings->get_current_crate (),
trait_resolved_node, &trait_type_seg);
rust_assert (ok);
CanonicalPath projection
= TraitImplProjection::resolve (seg.get_node_id (), *trait_type_seg,
*impl_type_seg);
result = result.append (projection);
return true;
}
} // namespace Resolver
} // namespace Rust
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