[gcc/devel/rust/master] Add name resolution for closures

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:8c4cf085d9afeada0e6c79c29904ee597c51bd25

commit 8c4cf085d9afeada0e6c79c29904ee597c51bd25
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Mon Oct 17 17:51:15 2022 +0100

    Add name resolution for closures
    
    This is the first pass at name resolution, it simply creates a new rib for
    the closure. We eventually need more checks here to enforce what things
    can be included within the closure.

Diff:
---
 gcc/rust/resolve/rust-ast-resolve-expr.cc | 58 +++++++++++++++++++++++++++++++
 gcc/rust/resolve/rust-ast-resolve-expr.h  |  5 +++
 2 files changed, 63 insertions(+)

diff --git a/gcc/rust/resolve/rust-ast-resolve-expr.cc b/gcc/rust/resolve/rust-ast-resolve-expr.cc
index 4cc4e26e3e9..60b3ebacc2c 100644
--- a/gcc/rust/resolve/rust-ast-resolve-expr.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-expr.cc
@@ -565,6 +565,64 @@ ResolveExpr::visit (AST::RangeFromToInclExpr &expr)
   ResolveExpr::go (expr.get_to_expr ().get (), prefix, canonical_prefix);
 }
 
+void
+ResolveExpr::visit (AST::ClosureExprInner &expr)
+{
+  NodeId scope_node_id = expr.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 ());
+
+  for (auto &p : expr.get_params ())
+    {
+      resolve_closure_param (p);
+    }
+
+  ResolveExpr::go (expr.get_definition_expr ().get (), prefix,
+		   canonical_prefix);
+
+  resolver->get_name_scope ().pop ();
+  resolver->get_type_scope ().pop ();
+  resolver->get_label_scope ().pop ();
+}
+
+void
+ResolveExpr::visit (AST::ClosureExprInnerTyped &expr)
+{
+  NodeId scope_node_id = expr.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 ());
+
+  for (auto &p : expr.get_params ())
+    {
+      resolve_closure_param (p);
+    }
+
+  ResolveType::go (expr.get_return_type ().get ());
+  ResolveExpr::go (expr.get_definition_block ().get (), prefix,
+		   canonical_prefix);
+
+  resolver->get_name_scope ().pop ();
+  resolver->get_type_scope ().pop ();
+  resolver->get_label_scope ().pop ();
+}
+
+void
+ResolveExpr::resolve_closure_param (AST::ClosureParam &param)
+{
+  PatternDeclaration::go (param.get_pattern ().get ());
+
+  if (param.has_type_given ())
+    ResolveType::go (param.get_type ().get ());
+}
+
 ResolveExpr::ResolveExpr (const CanonicalPath &prefix,
 			  const CanonicalPath &canonical_prefix)
   : ResolverBase (), prefix (prefix), canonical_prefix (canonical_prefix)
diff --git a/gcc/rust/resolve/rust-ast-resolve-expr.h b/gcc/rust/resolve/rust-ast-resolve-expr.h
index a6f98cee1e8..c11718efd37 100644
--- a/gcc/rust/resolve/rust-ast-resolve-expr.h
+++ b/gcc/rust/resolve/rust-ast-resolve-expr.h
@@ -75,6 +75,11 @@ public:
   void visit (AST::RangeToExpr &expr) override;
   void visit (AST::RangeFullExpr &expr) override;
   void visit (AST::RangeFromToInclExpr &expr) override;
+  void visit (AST::ClosureExprInner &expr) override;
+  void visit (AST::ClosureExprInnerTyped &expr) override;
+
+protected:
+  void resolve_closure_param (AST::ClosureParam &param);
 
 private:
   ResolveExpr (const CanonicalPath &prefix,