json: Add get_map() method to JSON object class

This patch adds a get_map () method to the JSON object class to provide access
to the underlying hash map that stores the JSON key-value pairs.

To do this, we expose the map_t typedef, the return type of get_map().

This change is needed to allow traversal of key-value pairs when parsing
user-provided JSON tuning data.

Additionally, is_a_helper template specializations for json::literal * and
const json::literal * were added to make dynamic casting in the next patch
easier.

This patch was bootstrapped and regtested on aarch64-linux-gnu, no regression.

Signed-off-by: Soumya AR <soumyaa@nvidia.com>
gcc/ChangeLog:

	* json.h (class object): Add get_map () method.
	(is_a_helper<json::literal *>, is_a_helper<const json::literal *>):
	New template specializations.

diff --git a/gcc/json.h b/gcc/json.h
index c53715ecb2ca00997cedc7964a34814c6a8a86f0..90b6c601f809cbdd810677d1ae73b9c118be9f7d 100644 (file)
--- a/gcc/json.h
+++ b/gcc/json.h
@@ -189,6 +189,9 @@ class object : public value
  public:
   ~object ();
 
+  typedef hash_map <char *, value *,
+    simple_hashmap_traits<nofree_string_hash, value *> > map_t;
+
   enum kind get_kind () const final override { return JSON_OBJECT; }
   void print (pretty_printer *pp, bool formatted) const final override;
   std::unique_ptr<value> clone () const final override;
@@ -214,6 +217,7 @@ class object : public value
   }
 
   value *get (const char *key) const;
+  const map_t &get_map () const { return m_map; }
 
   void set_string (const char *key, const char *utf8_value);
   void set_integer (const char *key, long v);
@@ -243,8 +247,6 @@ class object : public value
   std::unique_ptr<object> clone_as_object () const;
 
  private:
-  typedef hash_map <char *, value *,
-    simple_hashmap_traits<nofree_string_hash, value *> > map_t;
   map_t m_map;
 
   /* Keep track of order in which keys were inserted.  */
@@ -497,6 +499,26 @@ is_a_helper <const json::string *>::test (const  json::value *jv)
   return jv->get_kind () == json::JSON_STRING;
 }
 
+template <>
+template <>
+inline bool
+is_a_helper<json::literal *>::test (json::value *jv)
+{
+  return (jv->get_kind () == json::JSON_TRUE
+         || jv->get_kind () == json::JSON_FALSE
+         || jv->get_kind () == json::JSON_NULL);
+}
+
+template <>
+template <>
+inline bool
+is_a_helper<const json::literal *>::test (const json::value *jv)
+{
+  return (jv->get_kind () == json::JSON_TRUE
+         || jv->get_kind () == json::JSON_FALSE
+         || jv->get_kind () == json::JSON_NULL);
+}
+
 #if CHECKING_P
 
 namespace selftest {