gccrs: Add name resolution for on globbing use decl

This is the first part of the code required to enable globbing on use
declarations.

gcc/rust/ChangeLog:

	* resolve/rust-toplevel-name-resolver-2.0.cc (GlobbingVisitor::visit):
	Insert names into their namespace.
	(TopLevel::visit): Insert ast module.
	(TopLevel::handle_use_dec): Resolve use declaration.
	(TopLevel::handle_use_glob): Use globbing visitor.
	(flatten_list): Use globbing path vector.
	(flatten_glob): Likewise.
	(flatten): Likewise.
	(prefix_subpaths): Add a function to prefix subpath.
	* resolve/rust-toplevel-name-resolver-2.0.h (class GlobbingVisitor):
	Add globbing visitor.
	* util/rust-hir-map.cc (Mappings::insert_ast_module): Add function to
	insert module in module hashmap.
	(Mappings::lookup_ast_module): Add function to retrieve ast module.
	* util/rust-hir-map.h: Add module map and getter/setter prototypes.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index c62c111..05b26d6 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -17,9 +17,11 @@
 // <http://www.gnu.org/licenses/>.
 
 #include "rust-hir-map.h"
+#include "optional.h"
 #include "rust-ast-full.h"
 #include "rust-diagnostics.h"
 #include "rust-hir-full.h"
+#include "rust-item.h"
 #include "rust-macro-builtins.h"
 #include "rust-mapping-common.h"
 #include "rust-attribute-values.h"
@@ -1159,6 +1161,23 @@ Mappings::lookup_module_children (NodeId module)
 }
 
 void
+Mappings::insert_ast_module (AST::Module *module)
+{
+  rust_assert (modules.find (module->get_node_id ()) == modules.end ());
+  modules[module->get_node_id ()] = module;
+}
+
+tl::optional<AST::Module *>
+Mappings::lookup_ast_module (NodeId id)
+{
+  auto it = modules.find (id);
+  if (it == modules.end ())
+    return tl::nullopt;
+
+  return {it->second};
+}
+
+void
 Mappings::insert_module_child_item (NodeId module,
 				    Resolver::CanonicalPath child)
 {