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   ly_add_function_documentation (FUNCNAME, "(SCM x)", "Check if @var{x} is a " #CL " object");\
  21 }\
  22 ADD_SCM_INIT_FUNC (init_type_p_ ## CL, init_type_p_ ## 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 #define IMPLEMENT_SIMPLE_SMOBS(CL)                              \
  34 scm_t_bits CL::smob_tag_;                                       \
  35 SCM                                                             \
  36 CL::smob_p (SCM s)                                              \
  37 {                                                               \
  38   if (SCM_NIMP (s) && SCM_CELL_TYPE (s) == smob_tag_)           \
  39     return SCM_BOOL_T;                                          \
  40   else                                                          \
  41     return SCM_BOOL_F;                                          \
  42                                                                 \
  43 }                                                               \
  44 void                                                            \
  45 CL::init_smobs ()                                               \
  46 {                                                               \
  47   smob_tag_ = scm_make_smob_type (#CL, 0);                      \
  48   scm_set_smob_mark (smob_tag_, CL::mark_smob);                 \
  49   scm_set_smob_free (smob_tag_, CL::free_smob);                 \
  50   scm_set_smob_print (smob_tag_, CL::print_smob);               \
  51   scm_set_smob_equalp (smob_tag_, CL::equal_p);                 \
  52 }                                                               \
  53 SCM CL::smobbed_self () const                                   \
  54 {                                                               \
  55   SCM s;                                                        \
  56   s = gh_cons (SCM_PACK (CL::smob_tag_), SCM_PACK (this));      \
  57   scm_done_malloc (sizeof (CL));                                \
  58                                                                 \
  59   return s;                                                     \
  60 }                                                               \
  61 size_t                                                          \
  62 CL::free_smob (SCM ses)                                         \
  63 {                                                               \
  64   CL * s = (CL*) SCM_CDR (ses);                                 \
  65    delete s;                                                    \
  66   return sizeof (CL);                                           \
  67 }                                                               \
  68 ADD_SCM_INIT_FUNC (CL, CL::init_smobs)
  69
  70 #define IMPLEMENT_SMOBS(CL)                                                     \
  71 IMPLEMENT_SIMPLE_SMOBS (CL)                                                     \
  72 SCM                                                                             \
  73 CL::smobify_self ()                                                             \
  74 {                                                                               \
  75   SCM s =   unprotected_smobify_self ();\
  76   scm_gc_protect_object (s);\
  77   return s;\
  78 }\
  79 SCM                                                                             \
  80 CL::unprotected_smobify_self ()                                                         \
  81 {                                                                               \
  82   /*                                                                            \
  83     This is local. We don't assign to self_scm_ directly, to assure             \
  84     that S isn't GC-ed from under us.                                           \
  85                                                                                 \
  86     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
  87     deal half-initialized objects: scm_done_malloc ( ) might trigger GC.                \
  88     the warning in smobs.hh is just to be doubleplus goodly sure                \
  89    */                                                                           \
  90   SCM s;                                                                                \
  91   SCM_NEWCELL (s);                                                              \
  92   SCM_SETCAR (s,CL::smob_tag_);                                                 \
  93   SCM_SETCDR (s, SCM_PACK (this));                                              \
  94   self_scm_ = s;                                                                \
  95  scm_done_malloc (sizeof (CL));                                                 \
  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