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_c_define_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 scm_t_bits 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 (#CL, 0);                      \
  54   scm_set_smob_mark (smob_tag_, CL::mark_smob);                 \
  55   scm_set_smob_free (smob_tag_, CL::free_smob);                 \
  56   scm_set_smob_print (smob_tag_, CL::print_smob);               \
  57   scm_set_smob_equalp (smob_tag_, CL::equal_p);                 \
  58 }                                                               \
  59 SCM CL::smobbed_self () const                                   \
  60 {                                                               \
  61   SCM s;                                                        \
  62   s = gh_cons (SCM_PACK (CL::smob_tag_), SCM_PACK (this));      \
  63   scm_done_malloc (sizeof (CL));                                \
  64                                                                 \
  65   return s;                                                     \
  66 }                                                               \
  67 CL *                                                            \
  68 CL::unsmob (SCM s)                                              \
  69 {                                                               \
  70   if (SCM_NIMP (s) && SCM_CELL_TYPE (s) == smob_tag_)           \
  71     return (CL*) SCM_CELL_WORD_1 (s);                           \
  72   else                                                          \
  73     return 0;                                                   \
  74 }                                                               \
  75 size_t                                                          \
  76 CL::free_smob (SCM ses)                                         \
  77 {                                                               \
  78   CL * s = (CL*) SCM_CDR (ses);                                 \
  79    delete s;                                                    \
  80   return sizeof (CL);                                           \
  81 }                                                               \
  82 ADD_SCM_INIT_FUNC (CL, CL::init_smobs)
  83
  84 #define IMPLEMENT_SMOBS(CL)                                                     \
  85 IMPLEMENT_SIMPLE_SMOBS (CL)                                                     \
  86 SCM                                                                             \
  87 CL::smobify_self ()                                                             \
  88 {                                                                               \
  89   SCM s =   unprotected_smobify_self ();\
  90   scm_gc_protect_object (s);\
  91   return s;\
  92 }\
  93 SCM                                                                             \
  94 CL::unprotected_smobify_self ()                                                         \
  95 {                                                                               \
  96   /*                                                                            \
  97     This is local. We don't assign to self_scm_ directly, to assure             \
  98     that S isn't GC-ed from under us.                                           \
  99                                                                                 \
 100     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
 101     deal half-initialized objects: scm_done_malloc ( ) might trigger GC.                \
 102     the warning in smobs.hh is just to be doubleplus goodly sure                \
 103    */                                                                           \
 104   SCM s;                                                                                \
 105   SCM_NEWCELL (s);                                                              \
 106   SCM_SETCAR (s,CL::smob_tag_);                                                 \
 107   SCM_SETCDR (s, SCM_PACK (this));                                              \
 108   self_scm_ = s;                                                                \
 109  scm_done_malloc (sizeof (CL));                                                 \
 110   return s;                                                                     \
 111 }
 112
 113 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
 114 SCM                                             \
 115 CL::equal_p (SCM a , SCM b)                     \
 116 {                                               \
 117   return a == b ? SCM_BOOL_T : SCM_BOOL_F;      \
 118 }
 119
 120
 121 #endif /* LY_SMOBS_ICC */
 122
 123