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FFI: Add C data handling and C type conversions.

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This commit is contained in:
Mike Pall
2010-12-05 00:18:07 +01:00
parent 05973ee440
commit 526e087e63
9 changed files with 1149 additions and 17 deletions
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62
src/lj_cdata.h Normal file
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/*
** C data management.
** Copyright (C) 2005-2010 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_CDATA_H
#define _LJ_CDATA_H
#include "lj_obj.h"
#include "lj_gc.h"
#include "lj_ctype.h"
#if LJ_HASFFI
/* Get C data pointer. */
static LJ_AINLINE void *cdata_getptr(void *p, CTSize sz)
{
if (LJ_64 && sz == 4) { /* Support 32 bit pointers on 64 bit targets. */
return ((void *)(uintptr_t)*(uint32_t *)p);
} else {
lua_assert(sz == CTSIZE_PTR);
return *(void **)p;
}
}
/* Set C data pointer. */
static LJ_AINLINE void cdata_setptr(void *p, CTSize sz, const void *v)
{
if (LJ_64 && sz == 4) { /* Support 32 bit pointers on 64 bit targets. */
*(uint32_t *)p = (uint32_t)(uintptr_t)v;
} else {
lua_assert(sz == CTSIZE_PTR);
*(void **)p = (void *)v;
}
}
/* Allocate fixed-size C data object. */
static LJ_AINLINE GCcdata *lj_cdata_new(CTState *cts, CTypeID id, CTSize sz)
{
GCcdata *cd;
lua_assert(lj_ctype_size(cts, id) == sz);
cd = (GCcdata *)lj_mem_newgco(cts->L, sizeof(GCcdata) + sz);
cd->gct = ~LJ_TCDATA;
cd->typeid = ctype_check(cts, id);
return cd;
}
LJ_FUNC GCcdata *lj_cdata_newref(CTState *cts, const void *pp, CTypeID id);
LJ_FUNC GCcdata *lj_cdata_newv(CTState *cts, CTypeID id, CTSize sz,
CTSize align);
LJ_FUNC void LJ_FASTCALL lj_cdata_free(global_State *g, GCcdata *cd);
LJ_FUNC CType *lj_cdata_index(CTState *cts, GCcdata *cd, cTValue *key,
uint8_t **pp, CTInfo *qual);
LJ_FUNC void lj_cdata_get(CTState *cts, CType *s, TValue *o, uint8_t *sp);
LJ_FUNC void lj_cdata_set(CTState *cts, CType *d, uint8_t *dp, TValue *o,
CTInfo qual);
#endif
#endif