* problem.. */
#define QSHOW_SIGNALS 0
-/* FIXME: There seems to be no reason that LowtagOf can't be defined
- * as a (possibly inline) function instead of a macro. It would also
- * be reasonable to rename the constants in ALL CAPS. */
+#define N_LOWTAG_BITS 3
+#define LOWTAG_MASK ((1<<N_LOWTAG_BITS)-1)
+#define N_WIDETAG_BITS 8
+#define WIDETAG_MASK ((1<<N_WIDETAG_BITS)-1)
-#define lowtag_Bits 3
-#define lowtag_Mask ((1<<lowtag_Bits)-1)
-#define LowtagOf(obj) ((obj)&lowtag_Mask)
-#define type_Bits 8
-#define type_Mask ((1<<type_Bits)-1)
+/* FIXME: Make HeaderValue, CONS, SYMBOL, and FDEFN into inline
+ * functions instead of macros. */
-/* FIXME: There seems to be no reason that TypeOf, HeaderValue,
- * Pointerp, PTR, CONS, SYMBOL, and FDEFN can't be defined
- * as (possibly inline) functions instead of macros. */
+#define HeaderValue(obj) ((unsigned long) ((obj) >> N_WIDETAG_BITS))
-#define TypeOf(obj) ((obj)&type_Mask)
-#define HeaderValue(obj) ((unsigned long) ((obj)>>type_Bits))
-
-#define Pointerp(obj) ((obj) & 0x01)
-#define PTR(obj) ((unsigned long)((obj)&~lowtag_Mask))
-
-#define CONS(obj) ((struct cons *)((obj)-type_ListPointer))
-#define SYMBOL(obj) ((struct symbol *)((obj)-type_OtherPointer))
-#define FDEFN(obj) ((struct fdefn *)((obj)-type_OtherPointer))
+#define CONS(obj) ((struct cons *)((obj)-LIST_POINTER_LOWTAG))
+#define SYMBOL(obj) ((struct symbol *)((obj)-OTHER_POINTER_LOWTAG))
+#define FDEFN(obj) ((struct fdefn *)((obj)-OTHER_POINTER_LOWTAG))
/* KLUDGE: These are in theory machine-dependent and OS-dependent, but
* in practice the "foo int" definitions work for all the machines
typedef u32 lispobj;
+static inline int
+lowtag_of(lispobj obj) {
+ return obj & LOWTAG_MASK;
+}
+
+static inline int
+widetag_of(lispobj obj) {
+ return obj & WIDETAG_MASK;
+}
+
+/* Is the Lisp object obj something with pointer nature (as opposed to
+ * e.g. a fixnum or character or unbound marker)? */
+static inline int
+is_lisp_pointer(lispobj obj)
+{
+ return obj & 1;
+}
+
+/* Convert from a lispobj with type bits to a native (ordinary
+ * C/assembly) pointer to the beginning of the object. */
+static inline lispobj
+native_pointer(lispobj obj)
+{
+ return obj & ~LOWTAG_MASK;
+}
+
/* FIXME: There seems to be no reason that make_fixnum and fixnum_value
* can't be implemented as (possibly inline) functions. */
#define make_fixnum(n) ((lispobj)((n)<<2))
* instead of macros. */
#define SymbolValue(sym) \
- (((struct symbol *)((sym)-type_OtherPointer))->value)
+ (((struct symbol *)((sym)-OTHER_POINTER_LOWTAG))->value)
#define SetSymbolValue(sym,val) \
- (((struct symbol *)((sym)-type_OtherPointer))->value = (val))
+ (((struct symbol *)((sym)-OTHER_POINTER_LOWTAG))->value = (val))
/* This only works for static symbols. */
/* FIXME: should be called StaticSymbolFunction, right? */
#define SymbolFunction(sym) \
- (((struct fdefn *)(SymbolValue(sym)-type_OtherPointer))->function)
+ (((struct fdefn *)(SymbolValue(sym)-OTHER_POINTER_LOWTAG))->fun)
/* KLUDGE: As far as I can tell there's no ANSI C way of saying
* "this function never returns". This is the way that you do it
* in GCC later than version 2.7 or so. If you are using some
* compiler that doesn't understand this, you could could just
* change it to "typedef void never_returns" and nothing would
- * break, you might just get a few more bytes of compiled code or
+ * break, though you might get a few more bytes of compiled code or
* a few more compiler warnings. -- WHN 2000-10-21 */
typedef volatile void never_returns;