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