lily/include/ly-smobs.icc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef LY_SMOBS_ICC
  21 #define LY_SMOBS_ICC
  22
  23 #include "smobs.hh"
  24
  25 #define IMPLEMENT_TYPE_P(CL, FUNCNAME)                                  \
  26   SCM CL ## _type_p_proc;                                               \
  27   void init_type_ ## CL ()                                              \
  28   {                                                                     \
  29     SCM subr = scm_c_define_gsubr (FUNCNAME, 1, 0, 0,                   \
  30                                    (Scheme_function_unknown) CL::smob_p); \
  31     CL ## _type_p_proc = subr;                                          \
  32     ly_add_function_documentation (subr, FUNCNAME, "(SCM x)",           \
  33                                    "Is @var{x} a @code{" #CL "} object?"); \
  34     scm_c_export (FUNCNAME, NULL);                                      \
  35   }                                                                     \
  36   ADD_SCM_INIT_FUNC (init_type_ ## CL, init_type_ ## CL)
  37
  38 #define IMPLEMENT_BASE_SMOBS(CL)                                        \
  39   void \
  40   CL ## _type_adder ()                  \
  41   {\
  42     ly_add_type_predicate ((void*) &CL::unsmob, #CL);   \
  43   }\
  44   ADD_SCM_INIT_FUNC(CL ## _type_adder_ctor, \
  45                     CL ## _type_adder);\
  46   const char *CL::smob_name_ = #CL;                                     \
  47   scm_t_bits CL::smob_tag_;                                             \
  48   SCM                                                                   \
  49   CL::smob_p (SCM s)                                                    \
  50   {                                                                     \
  51     if (SCM_NIMP (s) && SCM_CELL_TYPE (s) == smob_tag_)                 \
  52       return SCM_BOOL_T;                                                \
  53     else                                                                \
  54       return SCM_BOOL_F;                                                \
  55                                                                         \
  56   }                                                                     \
  57                                                                         \
  58   void                                                                  \
  59   CL::init_smobs ()                                                     \
  60   {                                                                     \
  61     smob_tag_ = scm_make_smob_type (#CL, 0);                            \
  62     scm_set_smob_mark (smob_tag_, CL::mark_smob);                       \
  63     scm_set_smob_free (smob_tag_, CL::free_smob);                       \
  64     scm_set_smob_print (smob_tag_, CL::print_smob);                     \
  65     scm_set_smob_equalp (smob_tag_, CL::equal_p);                       \
  66   }                                                                     \
  67                                                                         \
  68   size_t                                                                \
  69   CL::free_smob (SCM ses)                                               \
  70   {                                                                     \
  71     CL *s = (CL *) SCM_CELL_WORD_1 (ses);                               \
  72     delete s;                                                           \
  73     /*    scm_gc_unregister_collectable_memory (s, sizeof (CL), #CL " smob"); */ \
  74     return SMOB_FREE_RETURN_VAL (CL);                                   \
  75   }                                                                     \
  76                                                                         \
  77   ADD_SCM_INIT_FUNC (CL, CL::init_smobs)
  78
  79 #define IMPLEMENT_SIMPLE_SMOBS(CL)                                      \
  80   IMPLEMENT_BASE_SMOBS (CL);                                            \
  81   SCM CL::smobbed_copy () const                                         \
  82   {                                                                     \
  83     CL *ptr = new CL (*this);                                           \
  84     SCM s;                                                              \
  85     s = scm_cons (SCM_PACK (CL::smob_tag_), SCM_PACK (ptr));            \
  86     scm_gc_register_collectable_memory ((CL *)this, sizeof (CL), #CL " smob"); \
  87                                                                         \
  88     return s;                                                           \
  89   }
  90
  91 #define IMPLEMENT_SMOBS(CL)                                             \
  92   IMPLEMENT_BASE_SMOBS (CL)                                             \
  93     void                                                                \
  94   CL::smobify_self ()                                                   \
  95   {                                                                     \
  96     protection_cons_ = SCM_EOL;                                         \
  97     self_scm_ = unprotected_smobify_self ();                            \
  98     protect ();                                                         \
  99   }                                                                     \
 100   void                                                                  \
 101   CL::protect ()                                                        \
 102   {                                                                     \
 103     protect_smob (self_scm_, &protection_cons_);                        \
 104   }                                                                     \
 105   SCM                                                                   \
 106   CL::unprotect ()                                                      \
 107   {                                                                     \
 108     unprotect_smob (self_scm_, &protection_cons_);                      \
 109     return self_scm_;                                                   \
 110   }                                                                     \
 111   SCM                                                                   \
 112   CL::unprotected_smobify_self ()                                       \
 113   {                                                                     \
 114     /*                                                                  \
 115       This is local. We don't assign to self_scm_ directly, to assure   \
 116       that S isn't GC-ed from under us.                                 \
 117                                                                         \
 118       We don't use smobbed_self () to ensure that mark_smob () doesn't  \
 119       have to deal half-initialized objects: scm_done_malloc ( ) might  \
 120       trigger GC.the warning in smobs.hh is just to be doubleplus       \
 121       goodly sure                                                       \
 122     */                                                                  \
 123     SCM s;                                                              \
 124     SCM_NEWSMOB (s, CL::smob_tag_, this);                               \
 125     self_scm_ = s;                                                      \
 126     scm_gc_register_collectable_memory (this, sizeof (CL), #CL " smob"); \
 127     return s;                                                           \
 128   }
 129
 130 #define IMPLEMENT_DEFAULT_EQUAL_P(CL)           \
 131   SCM                                           \
 132   CL::equal_p (SCM a, SCM b)                    \
 133   {                                             \
 134     return a == b ? SCM_BOOL_T : SCM_BOOL_F;    \
 135   }
 136
 137 #endif /* LY_SMOBS_ICC */
 138