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_TYPE_P(CL, FUNCNAME)\
  17 void init_type_ ## CL ()\
  18 {\
  19   scm_c_define_gsubr (FUNCNAME, 1, 0, 0, (Scheme_function_unknown) CL::smob_p);\
  20   ly_add_function_documentation (FUNCNAME, "(SCM x)", "Check if @var{x} is a " #CL " object");\
  21   scm_c_export (FUNCNAME, NULL);\
  22 }\
  23 ADD_SCM_INIT_FUNC (init_type_ ## CL, init_type_ ## CL)
  24
  25 #ifndef SCM_CELL_TYPE
  26 #define SCM_CELL_TYPE(X) SCM_CAR (X)
  27 #endif
  28
  29 #ifndef SCM_CELL_WORD_1
  30 #define SCM_CELL_WORD_1(X) SCM_CDR (X)
  31 #endif
  32
  33
  34
  35 #define IMPLEMENT_SIMPLE_SMOBS(CL)                              \
  36 scm_t_bits CL::smob_tag_;                                       \
  37 SCM                                                             \
  38 CL::smob_p (SCM s)                                              \
  39 {                                                               \
  40   if (SCM_NIMP (s) && SCM_CELL_TYPE (s) == smob_tag_)           \
  41     return SCM_BOOL_T;                                          \
  42   else                                                          \
  43     return SCM_BOOL_F;                                          \
  44                                                                 \
  45 }                                                               \
  46 void                                                            \
  47 CL::init_smobs ()                                               \
  48 {                                                               \
  49   smob_tag_ = scm_make_smob_type (#CL, 0);                      \
  50   scm_set_smob_mark (smob_tag_, CL::mark_smob);                 \
  51   scm_set_smob_free (smob_tag_, CL::free_smob);                 \
  52   scm_set_smob_print (smob_tag_, CL::print_smob);               \
  53   scm_set_smob_equalp (smob_tag_, CL::equal_p);                 \
  54 }                                                               \
  55 SCM CL::smobbed_self () const                                   \
  56 {                                                               \
  57   SCM s;                                                        \
  58   s = gh_cons (SCM_PACK (CL::smob_tag_), SCM_PACK (this));      \
  59   scm_gc_register_collectable_memory ((CL*)this, sizeof (CL), #CL " smob");                             \
  60                                                                 \
  61   return s;                                                     \
  62 }                                                               \
  63 size_t                                                          \
  64 CL::free_smob (SCM ses)                                         \
  65 {                                                               \
  66   CL * s = (CL*) SCM_CDR (ses);                                 \
  67   delete s;                                                     \
  68   scm_gc_unregister_collectable_memory (s, sizeof (CL), #CL " smob");  \
  69   return SMOB_FREE_RETURN_VAL(CL);\
  70 }\
  71 ADD_SCM_INIT_FUNC (CL, CL::init_smobs)
  72
  73 #define IMPLEMENT_SMOBS(CL)                                                     \
  74 IMPLEMENT_SIMPLE_SMOBS (CL)                                                     \
  75 SCM                                                                             \
  76 CL::smobify_self ()                                                             \
  77 {                                                                               \
  78   SCM s =   unprotected_smobify_self ();\
  79   scm_gc_protect_object (s);\
  80   return s;\
  81 }\
  82 SCM                                                                             \
  83 CL::unprotected_smobify_self ()                                                         \
  84 {                                                                               \
  85   /*                                                                            \
  86     This is local. We don't assign to self_scm_ directly, to assure             \
  87     that S isn't GC-ed from under us.                                           \
  88                                                                                 \
  89     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
  90     deal half-initialized objects: scm_done_malloc ( ) might trigger GC.                \
  91     the warning in smobs.hh is just to be doubleplus goodly sure                \
  92    */                                                                           \
  93   SCM s;\
  94   SCM_NEWSMOB (s, CL::smob_tag_, this);\
  95   self_scm_ = s;                                                                \
  96  scm_gc_register_collectable_memory (this, sizeof (CL), #CL " smob");                                                   \
  97   return s;                                                                     \
  98 }
  99
 100 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
 101 SCM                                             \
 102 CL::equal_p (SCM a , SCM b)                     \
 103 {                                               \
 104   return a == b ? SCM_BOOL_T : SCM_BOOL_F;      \
 105 }
 106
 107
 108 #endif /* LY_SMOBS_ICC */
 109
 110