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
  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 long CL::smob_tag_;                                             \
  35 void                                                            \
  36 CL::init_smobs ()                                               \
  37 {                                                               \
  38   smob_tag_ = scm_make_smob_type_mfpe (                         \
  39      #CL, 0, CL::mark_smob, CL::free_smob, CL::print_smob, 0);  \
  40 }                                                               \
  41 SCM CL::smobbed_self () const                                   \
  42 {                                                               \
  43   SCM s;                                                        \
  44   s = gh_cons (SCM_PACK(CL::smob_tag_), SCM_PACK(this));        \
  45   scm_done_malloc(sizeof(CL));                                  \
  46                                                                 \
  47   return s;                                                     \
  48 }                                                               \
  49 CL *                                                            \
  50 CL::unsmob (SCM s)                                              \
  51 {                                                               \
  52   if (SCM_NIMP(s) && SCM_CELL_TYPE(s) == smob_tag_)             \
  53     return (CL*) SCM_CELL_WORD_1(s);                            \
  54   else                                                          \
  55     return 0;                                                   \
  56 }                                                               \
  57 scm_sizet                                                       \
  58 CL::free_smob (SCM ses)                                         \
  59 {                                                               \
  60   CL * s = (CL*) SCM_CDR(ses);                                  \
  61    delete s;                                                    \
  62   return sizeof (CL);                                           \
  63 }                                                               \
  64 ADD_SCM_INIT_FUNC(CL, CL::init_smobs)
  65
  66 #define IMPLEMENT_SMOBS(CL)                                                     \
  67 IMPLEMENT_SIMPLE_SMOBS(CL)                                                      \
  68 SCM                                                                             \
  69 CL::smobify_self ()                                                             \
  70 {                                                                               \
  71   SCM s =   unprotected_smobify_self ();\
  72   scm_protect_object (s);\
  73   return s;\
  74 }\
  75 SCM                                                                             \
  76 CL::unprotected_smobify_self ()                                                         \
  77 {                                                                               \
  78   /*                                                                            \
  79     This is local. We don't assign to self_scm_ directly, to assure             \
  80     that S isn't GC-ed from under us.                                           \
  81                                                                                 \
  82     We don't use smobbed_self () to ensure that mark_smob () doesn't have to    \
  83     deal half-initialized objects: scm_done_malloc( ) might trigger GC.         \
  84     the warning in smobs.hh is just to be doubleplus goodly sure                \
  85    */                                                                           \
  86   SCM s;                                                                                \
  87   SCM_NEWCELL(s);                                                               \
  88   SCM_SETCAR(s,CL::smob_tag_);                                                  \
  89   SCM_SETCDR (s, SCM_PACK(this));                                               \
  90   self_scm_ = s;                                                                \
  91  scm_done_malloc(sizeof(CL));                                                   \
  92   return s;                                                                     \
  93 }
  94
  95 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
  96 SCM                                             \
  97 CL::equal_p (SCM a , SCM b)                     \
  98 {                                               \
  99   return a == b ? SCM_BOOL_T : SCM_BOOL_F;      \
 100 }
 101
 102
 103 #endif /* LY_SMOBS_ICC */
 104
 105