gccrs: Unify ASTValidation::visit for ExternalFunctionItem and Function

gcc/rust/ChangeLog:

	* checks/errors/rust-ast-validation.cc (ASTValidation::visit):
	Add external function validation support. Add ErrorCode::E0130.
	* parse/rust-parse-impl.h (Parser::parse_function): Parse
	external functions from `parse_function`.
	(Parser::parse_external_item): Clang format.
	(Parser::parse_pattern): Clang format.
	* parse/rust-parse.h: Add default parameter
	`is_external` in `parse_function`.

Signed-off-by: 0xn4utilus <gyanendrabanjare8@gmail.com>

2 files changed, 7 insertions, 5 deletions

diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
index 9d9722e..c8a87a1 100644
--- a/gcc/rust/parse/rust-parse-impl.h
+++ b/gcc/rust/parse/rust-parse-impl.h
@@ -2908,7 +2908,8 @@ Parser<ManagedTokenSource>::parse_use_tree ()
 template <typename ManagedTokenSource>
 std::unique_ptr<AST::Function>
 Parser<ManagedTokenSource>::parse_function (AST::Visibility vis,
-					    AST::AttrVec outer_attrs)
+					    AST::AttrVec outer_attrs,
+					    bool is_external)
 {
   location_t locus = lexer.peek_token ()->get_locus ();
   // Get qualifiers for function if they exist
@@ -2992,7 +2993,7 @@ Parser<ManagedTokenSource>::parse_function (AST::Visibility vis,
 		       std::move (generic_params), std::move (function_params),
 		       std::move (return_type), std::move (where_clause),
 		       std::move (body), std::move (vis),
-		       std::move (outer_attrs), locus));
+		       std::move (outer_attrs), locus, false, is_external));
 }
 
 // Parses function or method qualifiers (i.e. const, unsafe, and extern).
@@ -6166,6 +6167,7 @@ Parser<ManagedTokenSource>::parse_external_item ()
     case FN_KW:
       return parse_external_function_item (std::move (vis),
 					   std::move (outer_attrs));
+
     case TYPE:
       return parse_external_type_item (std::move (vis),
 				       std::move (outer_attrs));
@@ -10474,8 +10476,7 @@ Parser<ManagedTokenSource>::parse_pattern ()
     {
       lexer.skip_token ();
       alts.push_back (parse_pattern_no_alt ());
-    }
-  while (lexer.peek_token ()->get_id () == PIPE);
+  } while (lexer.peek_token ()->get_id () == PIPE);
 
   /* alternates */
   return std::unique_ptr<AST::Pattern> (
diff --git a/gcc/rust/parse/rust-parse.h b/gcc/rust/parse/rust-parse.h
index 8c8bf96..cdddfa6 100644
--- a/gcc/rust/parse/rust-parse.h
+++ b/gcc/rust/parse/rust-parse.h
@@ -253,7 +253,8 @@ private:
   parse_use_decl (AST::Visibility vis, AST::AttrVec outer_attrs);
   std::unique_ptr<AST::UseTree> parse_use_tree ();
   std::unique_ptr<AST::Function> parse_function (AST::Visibility vis,
-						 AST::AttrVec outer_attrs);
+						 AST::AttrVec outer_attrs,
+						 bool is_external = false);
   AST::FunctionQualifiers parse_function_qualifiers ();
   std::vector<std::unique_ptr<AST::GenericParam>>
   parse_generic_params_in_angles ();