Endian-aware FIX32 layout.

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

diff --git a/src/object.h b/src/object.h
index 8ebd80704a39ebdf8a70ba378bb070d34d9f9164..56f17b6425d598aee2174f1edcdd40cb66f0f2c5 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
 {
@@ -252,6 +261,7 @@ typedef union pool_object
   vector_object vector;
   uvector_object uvector;
   atom_object atom;
+  subr_object subr;
 } pool_object;
 
 union object
@@ -274,6 +284,7 @@ union object
   uvector_object uvector;
   atom_object atom;
   tuple_object tuple;
+  subr_object subr;
 };
 
 /**
@@ -380,6 +391,8 @@ Common object operations.
 
 uint32_t list_length (const list_object * o);
 
+dope_object *vec_dope (const vector_object * o);
+
 dope_object *uv_dope (const uvector_object * o);
 
 static inline evaltype
@@ -396,10 +409,23 @@ chtype (object * o, evaltype type)
   o->type = type;
 }
 
+// Allocate an vector of LOSEs and return a handle with length=0.
+vector_object vector_create (uint32_t capacity);
+
+// Stack-like interface to a VECTOR (with automatic GROW!)
+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)
 {