Compute the version number dynamically

[muddle-interpreter.git] / src / object.h

diff --git a/src/object.h b/src/object.h
index 54281f2396ebf7c629be3f6bdd7d4fad09d5ab73..1435f5d353098a0105296df4b9fe01ac116a996d 100644 (file)
--- a/src/object.h
+++ b/src/object.h
@@ -122,8 +122,17 @@ typedef union object object;
 
 typedef struct
 {
-  alignas (8) uint32_t _pad;
+  alignas (8)
+    // layout so that value can be upcast by reinterpreting as a fix64
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+  int32_t n;
+  uint32_t _pad;
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+  uint32_t _pad;
   int32_t n;
+#else
+#error Unusual endianness?
+#endif
 } fix32_val;
 typedef struct
 {
@@ -263,7 +272,11 @@ union object
     // NB. never take the address of these type-punned fields!
     alignas (16) evaltype type;
     opaque32 _unknown0;
-    opaque64 _unknown1;
+    union
+    {
+      opaque64 _unknown1;
+      uv_val uv_val;
+    };
   };
   /// objects of statically known type
   /// use as_X() for checked downcast
@@ -315,7 +328,6 @@ new_list (pool_ptr head)
   ,};
 }
 
-// TODO: take a dope_object like uvector
 static inline vector_object
 new_vector (heap_ptr body, uint32_t length)
 {
@@ -392,6 +404,10 @@ utype (const uvector_object * o)
   return uv_dope (o)->type;
 }
 
+object
+uv_get (const uvector_object * o, uint32_t i);
+
+
 // Change the EVALTYPE of an object. New type must have same PRIMTYPE.
 static inline void
 chtype (object * o, evaltype type)
@@ -410,6 +426,13 @@ object *stack_push (vector_object * v);
 Checked downcasts.
 */
 
+static inline fix32_object *
+as_fix32 (object * o)
+{
+  assert (TYPEPRIM_EQ (o->type, TYPEPRIM_FIX32));
+  return &o->fix32;
+}
+
 static inline list_object *
 as_list (object * o)
 {