Imported Upstream version 1.7.6

[platform/upstream/harfbuzz.git] / src / hb-object-private.hh

diff --git a/src/hb-object-private.hh b/src/hb-object-private.hh
index 7bd0f16..baa1f8f 100644 (file)
--- a/src/hb-object-private.hh
+++ b/src/hb-object-private.hh
@@ -33,33 +33,30 @@
 #define HB_OBJECT_PRIVATE_HH
 
 #include "hb-private.hh"
+#include "hb-debug.hh"
 
 #include "hb-atomic-private.hh"
 #include "hb-mutex-private.hh"
 
 
-/* Debug */
-
-#ifndef HB_DEBUG_OBJECT
-#define HB_DEBUG_OBJECT (HB_DEBUG+0)
-#endif
-
-
 /* reference_count */
 
-#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
-#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
+#define HB_REFERENCE_COUNT_INERT_VALUE -1
+#define HB_REFERENCE_COUNT_POISON_VALUE -0x0000DEAD
+#define HB_REFERENCE_COUNT_INIT {HB_ATOMIC_INT_INIT(HB_REFERENCE_COUNT_INERT_VALUE)}
+
 struct hb_reference_count_t
 {
   hb_atomic_int_t ref_count;
 
-  inline void init (int v) { ref_count = v; }
-  inline int inc (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count),  1); }
-  inline int dec (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count), -1); }
-  inline void finish (void) { ref_count = HB_REFERENCE_COUNT_INVALID_VALUE; }
-
-  inline bool is_invalid (void) const { return ref_count == HB_REFERENCE_COUNT_INVALID_VALUE; }
+  inline void init (int v) { ref_count.set_unsafe (v); }
+  inline int get_unsafe (void) const { return ref_count.get_unsafe (); }
+  inline int inc (void) { return ref_count.inc (); }
+  inline int dec (void) { return ref_count.dec (); }
+  inline void finish (void) { ref_count.set_unsafe (HB_REFERENCE_COUNT_POISON_VALUE); }
 
+  inline bool is_inert (void) const { return ref_count.get_unsafe () == HB_REFERENCE_COUNT_INERT_VALUE; }
+  inline bool is_valid (void) const { return ref_count.get_unsafe () > 0; }
 };
 
 
@@ -102,7 +99,7 @@ struct hb_object_header_t
   hb_reference_count_t ref_count;
   hb_user_data_array_t user_data;
 
-#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INVALID, HB_USER_DATA_ARRAY_INIT}
+#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, HB_USER_DATA_ARRAY_INIT}
 
   private:
   ASSERT_POD ();
@@ -117,7 +114,7 @@ static inline void hb_object_trace (const Type *obj, const char *function)
   DEBUG_MSG (OBJECT, (void *) obj,
             "%s refcount=%d",
             function,
-            obj ? obj->header.ref_count.ref_count : 0);
+            obj ? obj->header.ref_count.get_unsafe () : 0);
 }
 
 template <typename Type>
@@ -141,7 +138,12 @@ static inline void hb_object_init (Type *obj)
 template <typename Type>
 static inline bool hb_object_is_inert (const Type *obj)
 {
-  return unlikely (obj->header.ref_count.is_invalid ());
+  return unlikely (obj->header.ref_count.is_inert ());
+}
+template <typename Type>
+static inline bool hb_object_is_valid (const Type *obj)
+{
+  return likely (obj->header.ref_count.is_valid ());
 }
 template <typename Type>
 static inline Type *hb_object_reference (Type *obj)
@@ -149,6 +151,7 @@ static inline Type *hb_object_reference (Type *obj)
   hb_object_trace (obj, HB_FUNC);
   if (unlikely (!obj || hb_object_is_inert (obj)))
     return obj;
+  assert (hb_object_is_valid (obj));
   obj->header.ref_count.inc ();
   return obj;
 }
@@ -158,6 +161,7 @@ static inline bool hb_object_destroy (Type *obj)
   hb_object_trace (obj, HB_FUNC);
   if (unlikely (!obj || hb_object_is_inert (obj)))
     return false;
+  assert (hb_object_is_valid (obj));
   if (obj->header.ref_count.dec () != 1)
     return false;
 
@@ -174,6 +178,7 @@ static inline bool hb_object_set_user_data (Type               *obj,
 {
   if (unlikely (!obj || hb_object_is_inert (obj)))
     return false;
+  assert (hb_object_is_valid (obj));
   return obj->header.user_data.set (key, data, destroy, replace);
 }
 
@@ -182,7 +187,8 @@ static inline void *hb_object_get_user_data (Type               *obj,
                                             hb_user_data_key_t *key)
 {
   if (unlikely (!obj || hb_object_is_inert (obj)))
-    return NULL;
+    return nullptr;
+  assert (hb_object_is_valid (obj));
   return obj->header.user_data.get (key);
 }