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 #include "smobs.hh"
  14
  15
  16 #define IMPLEMENT_UNSMOB(CL, name)              \
  17 CL *                                            \
  18 unsmob_ ## name ( SCM s)                        \
  19 {                                               \
  20 return  CL::unsmob (s);                         \
  21 }
  22
  23 #define IMPLEMENT_TYPE_P(CL, FUNCNAME)\
  24 void init_type_p_ ## CL ()\
  25 {\
  26   scm_make_gsubr (FUNCNAME, 1, 0, 0, (Scheme_function_unknown) CL::smob_p);\
  27 }\
  28 ADD_SCM_INIT_FUNC(init_type_p_ ## CL, init_type_p_ ## CL)
  29
  30 #ifndef SCM_CELL_TYPE
  31 #define SCM_CELL_TYPE(X) SCM_CAR(X)
  32 #endif
  33
  34 #ifndef SCM_CELL_WORD_1
  35 #define SCM_CELL_WORD_1(X) SCM_CDR(X)
  36 #endif
  37
  38
  39 #define IMPLEMENT_SIMPLE_SMOBS(CL)                              \
  40 long CL::smob_tag_;                                             \
  41 SCM                                                             \
  42 CL::smob_p (SCM s)                                              \
  43 {                                                               \
  44   if (SCM_NIMP(s) && SCM_CELL_TYPE(s) == smob_tag_)             \
  45     return SCM_BOOL_T;                                          \
  46   else                                                          \
  47     return SCM_BOOL_F;                                          \
  48                                                                 \
  49 }                                                               \
  50 void                                                            \
  51 CL::init_smobs ()                                               \
  52 {                                                               \
  53   smob_tag_ = scm_make_smob_type_mfpe (                         \
  54      #CL, 0, CL::mark_smob, CL::free_smob, CL::print_smob,      \
  55      CL::equal_p);                                              \
  56 }                                                               \
  57 SCM CL::smobbed_self () const                                   \
  58 {                                                               \
  59   SCM s;                                                        \
  60   s = gh_cons (SCM_PACK(CL::smob_tag_), SCM_PACK(this));        \
  61   scm_done_malloc(sizeof(CL));                                  \
  62                                                                 \
  63   return s;                                                     \
  64 }                                                               \
  65 CL *                                                            \
  66 CL::unsmob (SCM s)                                              \
  67 {                                                               \
  68   if (SCM_NIMP(s) && SCM_CELL_TYPE(s) == smob_tag_)             \
  69     return (CL*) SCM_CELL_WORD_1(s);                            \
  70   else                                                          \
  71     return 0;                                                   \
  72 }                                                               \
  73 scm_sizet                                                       \
  74 CL::free_smob (SCM ses)                                         \
  75 {                                                               \
  76   CL * s = (CL*) SCM_CDR(ses);                                  \
  77    delete s;                                                    \
  78   return sizeof (CL);                                           \
  79 }                                                               \
  80 ADD_SCM_INIT_FUNC(CL, CL::init_smobs)
  81
  82 #define IMPLEMENT_SMOBS(CL)                                                     \
  83 IMPLEMENT_SIMPLE_SMOBS(CL)                                                      \
  84 SCM                                                                             \
  85 CL::smobify_self ()                                                             \
  86 {                                                                               \
  87   SCM s =   unprotected_smobify_self ();\
  88   scm_protect_object (s);\
  89   return s;\
  90 }\
  91 SCM                                                                             \
  92 CL::unprotected_smobify_self ()                                                         \
  93 {                                                                               \
  94   /*                                                                            \
  95     This is local. We don't assign to self_scm_ directly, to assure             \
  96     that S isn't GC-ed from under us.                                           \
  97                                                                                 \
  98     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
  99     deal half-initialized objects: scm_done_malloc( ) might trigger GC.         \
 100     the warning in smobs.hh is just to be doubleplus goodly sure                \
 101    */                                                                           \
 102   SCM s;                                                                                \
 103   SCM_NEWCELL(s);                                                               \
 104   SCM_SETCAR(s,CL::smob_tag_);                                                  \
 105   SCM_SETCDR (s, SCM_PACK(this));                                               \
 106   self_scm_ = s;                                                                \
 107  scm_done_malloc(sizeof(CL));                                                   \
 108   return s;                                                                     \
 109 }
 110
 111 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
 112 SCM                                             \
 113 CL::equal_p (SCM a , SCM b)                     \
 114 {                                               \
 115   return a == b ? SCM_BOOL_T : SCM_BOOL_F;      \
 116 }
 117
 118
 119 #endif /* LY_SMOBS_ICC */
 120
 121