gccrs: hir: Start adapting visitors to accept multiple kinds of Paths

gcc/rust/ChangeLog:

	* ast/rust-item.h: Add new method to specifically get a type-path.
	* ast/rust-path.cc (LangItemPath::as_string): Implement properly.
	* hir/rust-ast-lower-type.cc (ASTLowerTypePath::translate): Adapt
	visitor to use the new LangItemPath.
	* hir/rust-ast-lower-type.h: Likewise.
	* resolve/rust-ast-resolve-item.cc (ResolveItem::visit): Likewise.
	* resolve/rust-ast-resolve-type.h: Likewise.

2 files changed, 29 insertions, 1 deletions

diff --git a/gcc/rust/resolve/rust-ast-resolve-item.cc b/gcc/rust/resolve/rust-ast-resolve-item.cc
index 245523a..a330541 100644
--- a/gcc/rust/resolve/rust-ast-resolve-item.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-item.cc
@@ -680,7 +680,7 @@ ResolveItem::visit (AST::TraitImpl &impl_block)
 
   // setup paths
   CanonicalPath canonical_trait_type = CanonicalPath::create_empty ();
-  bool ok = ResolveTypeToCanonicalPath::go (impl_block.get_trait_path (),
+  bool ok = ResolveTypeToCanonicalPath::go (impl_block.get_trait_path_type (),
 					    canonical_trait_type);
   if (!ok)
     {
diff --git a/gcc/rust/resolve/rust-ast-resolve-type.h b/gcc/rust/resolve/rust-ast-resolve-type.h
index 561948e..ed055a1 100644
--- a/gcc/rust/resolve/rust-ast-resolve-type.h
+++ b/gcc/rust/resolve/rust-ast-resolve-type.h
@@ -21,6 +21,8 @@
 
 #include "rust-ast-resolve-base.h"
 #include "rust-ast-resolve-expr.h"
+#include "rust-hir-map.h"
+#include "rust-path.h"
 
 namespace Rust {
 namespace Resolver {
@@ -56,6 +58,32 @@ class ResolveType : public ResolverBase
   using Rust::Resolver::ResolverBase::visit;
 
 public:
+  static NodeId go (AST::TypePath &type_path)
+  {
+    return ResolveType::go ((AST::Type &) type_path);
+  }
+
+  static NodeId go (AST::Path &type_path)
+  {
+    if (type_path.get_path_kind () == AST::Path::Kind::LangItem)
+      {
+	auto &type = static_cast<AST::LangItemPath &> (type_path);
+
+	Analysis::Mappings::get_lang_item (type);
+
+	type.get_node_id ();
+      }
+
+    rust_assert (type_path.get_path_kind () == AST::Path::Kind::Type);
+
+    // We have to do this dance to first downcast to a typepath, and then upcast
+    // to a Type. The altnernative is to split `go` into `go` and `go_inner` or
+    // something, but eventually this will need to change as we'll need
+    // `ResolveType::` to resolve other kinds of `Path`s as well.
+    return ResolveType::go (
+      (AST::Type &) static_cast<AST::TypePath &> (type_path));
+  }
+
   static NodeId go (AST::Type &type)
   {
     ResolveType resolver;