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; * src/lisp.h: Add Lisp_Object tagging scheme overview

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Mattias Engdegård 2024-02-21 15:22:21 +01:00
parent d575717846
commit a2eb123fb6
1 changed files with 10 additions and 0 deletions
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10
src/lisp.h
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@ -478,6 +478,16 @@ typedef EMACS_INT Lisp_Word;
#endif
/* Lisp_Object tagging scheme:
Tag location
Upper bits Lower bits Type Payload
000....... .......000 symbol offset from lispsym to struct Lisp_Symbol
001....... .......001 unused
01........ ........10 fixnum signed integer of FIXNUM_BITS
110....... .......011 cons pointer to struct Lisp_Cons
100....... .......100 string pointer to struct Lisp_String
101....... .......101 vectorlike pointer to union vectorlike_header
111....... .......111 float pointer to struct Lisp_Float */
enum Lisp_Type
{
/* Symbol. XSYMBOL (object) points to a struct Lisp_Symbol. */