gccrs: ast: Dump bare function type

+ Return FunctionQualifiers as ref to work in ast dump

gcc/rust/ChangeLog:

	* ast/rust-ast-dump.cc (Dump::visit): Add missing visitor.
	* ast/rust-ast-dump.h: Add missing getter declaration.
	* ast/rust-ast-full-test.cc (BareFunctionType::as_string): Fix bare function
	string representation.
	* ast/rust-type.h (class BareFunctionType): Declare said getter.

Signed-off-by: Jakub Dupak <dev@jakubdupak.com>

gcc/rust/ast/rust-ast-dump.cc

@@ -249,6 +249,56 @@ Dump::visit (std::vector<LifetimeParam> &for_lifetimes)
   stream << "> ";
 }
 
+void
+Dump::visit (FunctionQualifiers &qualifiers)
+{
+  // Syntax:
+  //    `const`? `async`? `unsafe`? (`extern` Abi?)?
+  //    unsafe? (extern Abi?)?
+
+  switch (qualifiers.get_const_status ())
+    {
+    case NONE:
+      break;
+    case CONST_FN:
+      stream << "const ";
+      break;
+    case ASYNC_FN:
+      stream << "async ";
+      break;
+    }
+
+  if (qualifiers.is_unsafe ())
+    stream << "unsafe ";
+  if (qualifiers.is_extern ())
+    {
+      stream << "extern ";
+      if (qualifiers.has_abi ())
+	stream << "\"" << qualifiers.get_extern_abi () << "\" ";
+    }
+} // namespace AST
+
+void
+Dump::visit (MaybeNamedParam &param)
+{
+  // Syntax:
+  //     OuterAttribute* ( ( IDENTIFIER | _ ) : )? Type
+
+  visit_items_joined_by_separator (param.get_outer_attrs (), " ");
+  switch (param.get_param_kind ())
+    {
+    case MaybeNamedParam::UNNAMED:
+      break;
+    case MaybeNamedParam::IDENTIFIER:
+      stream << " " << param.get_name () << ": ";
+      break;
+    case MaybeNamedParam::WILDCARD:
+      stream << " _: ";
+      break;
+    }
+  visit (param.get_type ());
+}
+
 void
 Dump::visit (Token &tok)
 {
@@ -1668,8 +1718,48 @@ Dump::visit (InferredType &)
 }
 
 void
-Dump::visit (BareFunctionType &)
-{}
+Dump::visit (BareFunctionType &type)
+{
+  // Syntax:
+  //    ForLifetimes? FunctionTypeQualifiers fn
+  //      ( FunctionParametersMaybeNamedVariadic? ) BareFunctionReturnType?
+  //
+  //    BareFunctionReturnType:
+  //      -> TypeNoBounds
+  //
+  //    FunctionParametersMaybeNamedVariadic :
+  //      MaybeNamedFunctionParameters | MaybeNamedFunctionParametersVariadic
+  //
+  //    MaybeNamedFunctionParameters :
+  //      MaybeNamedParam ( , MaybeNamedParam )* ,?
+  //
+  //    MaybeNamedFunctionParametersVariadic :
+  //      ( MaybeNamedParam , )* MaybeNamedParam , OuterAttribute* ...
+
+  if (type.has_for_lifetimes ())
+    visit (type.get_for_lifetimes ());
+
+  visit (type.get_function_qualifiers ());
+
+  stream << "fn (";
+
+  visit_items_joined_by_separator (type.get_function_params (), ", ");
+
+  if (type.is_variadic ())
+    {
+      stream << ", ";
+      visit_items_joined_by_separator (type.get_variadic_attr (), " ");
+      stream << "...";
+    }
+
+  stream << ')';
+
+  if (type.has_return_type ())
+    {
+      stream << " -> ";
+      visit (type.get_return_type ());
+    }
+}
 
 } // namespace AST
 } // namespace Rust

gcc/rust/ast/rust-ast-dump.h

@@ -137,6 +137,8 @@ private:
   void visit (MacroRule &rule);
   void visit (WhereClause &rule);
   void visit (std::vector<LifetimeParam> &for_lifetimes);
+  void visit (FunctionQualifiers &qualifiers);
+  void visit (MaybeNamedParam &param);
 
   // rust-ast.h
   void visit (Token &tok);

gcc/rust/ast/rust-ast-full-test.cc

@@ -3071,7 +3071,7 @@ BareFunctionType::as_string () const
     }
 
   str += "\n Is variadic: ";
-  if (is_variadic)
+  if (_is_variadic)
     str += "true";
   else
     str += "false";

gcc/rust/ast/rust-type.h

@@ -835,7 +835,7 @@ public:
 };
 
 /* A function pointer type - can be created via coercion from function items and
- * non- capturing closures. */
+ * non-capturing closures. */
 class BareFunctionType : public TypeNoBounds
 {
   // bool has_for_lifetimes;
@@ -844,7 +844,7 @@ class BareFunctionType : public TypeNoBounds
 
   FunctionQualifiers function_qualifiers;
   std::vector<MaybeNamedParam> params;
-  bool is_variadic;
+  bool _is_variadic;
   std::vector<Attribute> variadic_attrs;
 
   // bool has_return_type;
@@ -860,6 +860,16 @@ public:
   // Whether the function has ForLifetimes.
   bool has_for_lifetimes () const { return !for_lifetimes.empty (); }
 
+  std::vector<LifetimeParam> &get_for_lifetimes () { return for_lifetimes; }
+
+  bool is_variadic () const { return _is_variadic; }
+
+  std::vector<Attribute> &get_variadic_attr () { return variadic_attrs; };
+  const std::vector<Attribute> &get_variadic_attr () const
+  {
+    return variadic_attrs;
+  };
+
   BareFunctionType (std::vector<LifetimeParam> lifetime_params,
 		    FunctionQualifiers qualifiers,
 		    std::vector<MaybeNamedParam> named_params, bool is_variadic,
@@ -867,7 +877,7 @@ public:
 		    std::unique_ptr<TypeNoBounds> type, Location locus)
     : for_lifetimes (std::move (lifetime_params)),
       function_qualifiers (std::move (qualifiers)),
-      params (std::move (named_params)), is_variadic (is_variadic),
+      params (std::move (named_params)), _is_variadic (is_variadic),
       variadic_attrs (std::move (variadic_attrs)),
       return_type (std::move (type)), locus (locus)
   {
@@ -879,7 +889,7 @@ public:
   BareFunctionType (BareFunctionType const &other)
     : for_lifetimes (other.for_lifetimes),
       function_qualifiers (other.function_qualifiers), params (other.params),
-      is_variadic (other.is_variadic), variadic_attrs (other.variadic_attrs),
+      _is_variadic (other._is_variadic), variadic_attrs (other.variadic_attrs),
       locus (other.locus)
   {
     // guard to prevent null dereference
@@ -893,7 +903,7 @@ public:
     for_lifetimes = other.for_lifetimes;
     function_qualifiers = other.function_qualifiers;
     params = other.params;
-    is_variadic = other.is_variadic;
+    _is_variadic = other._is_variadic;
     variadic_attrs = other.variadic_attrs;
     locus = other.locus;
 
@@ -930,7 +940,7 @@ public:
     return return_type;
   }
 
-  FunctionQualifiers get_function_qualifiers () { return function_qualifiers; }
+  FunctionQualifiers &get_function_qualifiers () { return function_qualifiers; }
 
 protected:
   /* Use covariance to implement clone function as returning this object rather