lily/include/ly-smobs.icc

   1 /*
   2   ly-smobs.icc -- implement smob glue.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #ifndef LY_SMOBS_ICC
  11 #define LY_SMOBS_ICC
  12
  13
  14
  15 #define IMPLEMENT_UNSMOB(CL, name)              \
  16 CL *                                            \
  17 unsmob_ ## name ( SCM s)                        \
  18 {                                               \
  19   if (SMOB_IS_TYPE_B(CL, s))                    \
  20     return SMOB_TO_TYPE(CL, s);                 \
  21   else                                          \
  22     return 0;                                   \
  23 }\
  24 SCM smobify (CL *cl)\
  25 {\
  26   SCM s;                                                                \
  27                                                                         \
  28   SCM_NEWCELL(s);                                                       \
  29   SCM_SETCAR(s,CL::smob_tag_);                                          \
  30   SCM me_s = SCM_PACK(cl);                                                      \
  31   SCM_SETCDR (s, me_s); \
  32 return s;\
  33 }\
  34
  35
  36 /*
  37   should include equal_p ?
  38  */
  39 #define IMPLEMENT_SMOBS(CL)\
  40 long CL::smob_tag_;\
  41 static scm_smobfuns CL ## _funs = {                                     \
  42   CL::mark_smob, CL::free_smob,                                         \
  43   CL::print_smob, 0,                                                    \
  44 };                                                                      \
  45 void                                                                    \
  46 CL::init_smobs ()                                                       \
  47 {                                                                       \
  48   smob_tag_ = scm_newsmob (&CL ## _funs);                                       \
  49 }                                                                       \
  50                                                                         \
  51                                                                          \
  52 void                                                                     \
  53 CL::unsmobify_self ()                                                    \
  54 {                                                                        \
  55   SCM s = self_scm_;                                                     \
  56   scm_unprotect_object (s);                                              \
  57                                                                          \
  58   SCM_SETCAR (self_scm_, SCM_EOL); \
  59   SCM_SETCDR (self_scm_, SCM_EOL); \
  60   self_scm_ = SCM_EOL;                                                   \
  61 \
  62   scm_done_malloc ( - sizeof (CL));\
  63 }                                                                        \
  64 \
  65 SCM                                                                     \
  66 CL::smobify_self ()                                                     \
  67 {                                                                       \
  68   if (self_scm_ != SCM_EOL)                                             \
  69     return self_scm_;                                                   \
  70                                                                         \
  71   /*                                                                    \
  72     This is local. We don't assign to self_scm_ directly, to assure     \
  73     that S isn't GC-ed from under us.                                   \
  74    */                                                                   \
  75   SCM s = smobify (this); \
  76   self_scm_ = s;                                                        \
  77   scm_protect_object (s);                                               \
  78                                                                         \
  79   scm_done_malloc(sizeof(CL));\
  80   do_smobify_self();                                                    \
  81   return s;                                     \
  82 }                                               \
  83 scm_sizet                                       \
  84 CL::free_smob (SCM ses)                         \
  85 {                                               \
  86   CL * s = (CL*) SCM_CDR(ses);                  \
  87   /* someone else did the deed already; this might be an automatic var.*/ \
  88   if (s->self_scm_ != ses)\
  89      return 0; \
  90 \
  91  /* no need to call scm_unprotect_object, since this call \
  92     implies that the object is not protected. */ \
  93   SCM_SETCAR (ses, SCM_EOL); \
  94   delete s;\
  95   return sizeof (CL);\
  96 } \
  97 ADD_SCM_INIT_FUNC(CL, CL::init_smobs)\
  98
  99
 100 #endif /* LY_SMOBS_ICC */
 101