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--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7  */
   8
   9 #ifndef LY_SMOBS_ICC
  10 #define LY_SMOBS_ICC
  11
  12 #include "smobs.hh"
  13
  14
  15 #define IMPLEMENT_TYPE_P(CL, FUNCNAME)\
  16 void init_type_ ## CL ()\
  17 {\
  18   SCM subr = scm_c_define_gsubr (FUNCNAME, 1, 0, 0, (Scheme_function_unknown) CL::smob_p);\
  19   ly_add_function_documentation (subr, FUNCNAME, "(SCM x)", "Check if @var{x} is a " #CL " object");\
  20   scm_c_export (FUNCNAME, NULL);\
  21 }\
  22 ADD_SCM_INIT_FUNC (init_type_ ## CL, init_type_ ## CL)
  23
  24 #ifndef SCM_CELL_TYPE
  25 #define SCM_CELL_TYPE(X) SCM_CAR (X)
  26 #endif
  27
  28 #ifndef SCM_CELL_WORD_1
  29 #define SCM_CELL_WORD_1(X) SCM_CDR (X)
  30 #endif
  31
  32
  33
  34 #define IMPLEMENT_SIMPLE_SMOBS(CL)                              \
  35 scm_t_bits CL::smob_tag_;                                       \
  36 SCM                                                             \
  37 CL::smob_p (SCM s)                                              \
  38 {                                                               \
  39   if (SCM_NIMP (s) && SCM_CELL_TYPE (s) == smob_tag_)           \
  40     return SCM_BOOL_T;                                          \
  41   else                                                          \
  42     return SCM_BOOL_F;                                          \
  43                                                                 \
  44 }                                                               \
  45 void                                                            \
  46 CL::init_smobs ()                                               \
  47 {                                                               \
  48   smob_tag_ = scm_make_smob_type (#CL, 0);                      \
  49   scm_set_smob_mark (smob_tag_, CL::mark_smob);                 \
  50   scm_set_smob_free (smob_tag_, CL::free_smob);                 \
  51   scm_set_smob_print (smob_tag_, CL::print_smob);               \
  52   scm_set_smob_equalp (smob_tag_, CL::equal_p);                 \
  53 }                                                               \
  54 SCM CL::smobbed_self () const                                   \
  55 {                                                               \
  56   SCM s;                                                        \
  57   s = gh_cons (SCM_PACK (CL::smob_tag_), SCM_PACK (this));      \
  58   scm_gc_register_collectable_memory ((CL*)this, sizeof (CL), #CL " smob");                             \
  59                                                                 \
  60   return s;                                                     \
  61 }                                                               \
  62 size_t                                                          \
  63 CL::free_smob (SCM ses)                                         \
  64 {                                                               \
  65   CL * s = (CL*) SCM_CDR (ses);                                 \
  66   delete s;                                                     \
  67   scm_gc_unregister_collectable_memory (s, sizeof (CL), #CL " smob");  \
  68   return SMOB_FREE_RETURN_VAL(CL);\
  69 }\
  70 ADD_SCM_INIT_FUNC (CL, CL::init_smobs)
  71
  72 #define IMPLEMENT_SMOBS(CL)                                                     \
  73 IMPLEMENT_SIMPLE_SMOBS (CL)                                                     \
  74 SCM                                                                             \
  75 CL::smobify_self ()                                                             \
  76 {                                                                               \
  77   SCM s =   unprotected_smobify_self ();\
  78   scm_gc_protect_object (s);\
  79   return s;\
  80 }\
  81 SCM                                                                             \
  82 CL::unprotected_smobify_self ()                                                         \
  83 {                                                                               \
  84   /*                                                                            \
  85     This is local. We don't assign to self_scm_ directly, to assure             \
  86     that S isn't GC-ed from under us.                                           \
  87                                                                                 \
  88     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
  89     deal half-initialized objects: scm_done_malloc ( ) might trigger GC.                \
  90     the warning in smobs.hh is just to be doubleplus goodly sure                \
  91    */                                                                           \
  92   SCM s;\
  93   SCM_NEWSMOB (s, CL::smob_tag_, this);\
  94   self_scm_ = s;                                                                \
  95  scm_gc_register_collectable_memory (this, sizeof (CL), #CL " smob");                                                   \
  96   return s;                                                                     \
  97 }
  98
  99 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
 100 SCM                                             \
 101 CL::equal_p (SCM a , SCM b)                     \
 102 {                                               \
 103   return a == b ? SCM_BOOL_T : SCM_BOOL_F;      \
 104 }
 105
 106
 107 #endif /* LY_SMOBS_ICC */
 108
 109