src/lj_cdata.h

   1 /*
   2 ** C data management.
   3 ** Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #ifndef _LJ_CDATA_H
   7 #define _LJ_CDATA_H
   8
   9 #include "lj_obj.h"
  10 #include "lj_gc.h"
  11 #include "lj_ctype.h"
  12
  13 #if LJ_HASFFI
  14
  15 /* Get C data pointer. */
  16 static LJ_AINLINE void *cdata_getptr(void *p, CTSize sz)
  17 {
  18   if (LJ_64 && sz == 4) {  /* Support 32 bit pointers on 64 bit targets. */
  19     return ((void *)(uintptr_t)*(uint32_t *)p);
  20   } else {
  21     lua_assert(sz == CTSIZE_PTR);
  22     return *(void **)p;
  23   }
  24 }
  25
  26 /* Set C data pointer. */
  27 static LJ_AINLINE void cdata_setptr(void *p, CTSize sz, const void *v)
  28 {
  29   if (LJ_64 && sz == 4) {  /* Support 32 bit pointers on 64 bit targets. */
  30     *(uint32_t *)p = (uint32_t)(uintptr_t)v;
  31   } else {
  32     lua_assert(sz == CTSIZE_PTR);
  33     *(void **)p = (void *)v;
  34   }
  35 }
  36
  37 /* Allocate fixed-size C data object. */
  38 static LJ_AINLINE GCcdata *lj_cdata_new(CTState *cts, CTypeID id, CTSize sz)
  39 {
  40   GCcdata *cd;
  41 #ifdef LUA_USE_ASSERT
  42   CType *ct = ctype_raw(cts, id);
  43   lua_assert((ctype_hassize(ct->info) ? ct->size : CTSIZE_PTR) == sz);
  44 #endif
  45   cd = (GCcdata *)lj_mem_newgco(cts->L, sizeof(GCcdata) + sz);
  46   cd->gct = ~LJ_TCDATA;
  47   cd->ctypeid = ctype_check(cts, id);
  48   return cd;
  49 }
  50
  51 /* Variant which works without a valid CTState. */
  52 static LJ_AINLINE GCcdata *lj_cdata_new_(lua_State *L, CTypeID id, CTSize sz)
  53 {
  54   GCcdata *cd = (GCcdata *)lj_mem_newgco(L, sizeof(GCcdata) + sz);
  55   cd->gct = ~LJ_TCDATA;
  56   cd->ctypeid = id;
  57   return cd;
  58 }
  59
  60 LJ_FUNC GCcdata *lj_cdata_newref(CTState *cts, const void *pp, CTypeID id);
  61 LJ_FUNC GCcdata *lj_cdata_newv(CTState *cts, CTypeID id, CTSize sz,
  62                                CTSize align);
  63
  64 LJ_FUNC void LJ_FASTCALL lj_cdata_free(global_State *g, GCcdata *cd);
  65 LJ_FUNCA TValue * LJ_FASTCALL lj_cdata_setfin(lua_State *L, GCcdata *cd);
  66
  67 LJ_FUNC CType *lj_cdata_index(CTState *cts, GCcdata *cd, cTValue *key,
  68                               uint8_t **pp, CTInfo *qual);
  69 LJ_FUNC int lj_cdata_get(CTState *cts, CType *s, TValue *o, uint8_t *sp);
  70 LJ_FUNC void lj_cdata_set(CTState *cts, CType *d, uint8_t *dp, TValue *o,
  71                           CTInfo qual);
  72
  73 #endif
  74
  75 #endif