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Added AI genreated README.md. Needed to be read.
author MrJuneJune <me@mrjunejune.com>
date Sat, 24 Jan 2026 21:52:14 -0800
parents 94705b5986b3
children
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178
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1 /*
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2 ** C data management.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #ifndef _LJ_CDATA_H
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7 #define _LJ_CDATA_H
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8
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9 #include "lj_obj.h"
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10 #include "lj_gc.h"
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11 #include "lj_ctype.h"
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12
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13 #if LJ_HASFFI
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14
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15 /* Get C data pointer. */
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16 static LJ_AINLINE void *cdata_getptr(void *p, CTSize sz)
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17 {
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18 if (LJ_64 && sz == 4) { /* Support 32 bit pointers on 64 bit targets. */
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19 return ((void *)(uintptr_t)*(uint32_t *)p);
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20 } else {
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21 lj_assertX(sz == CTSIZE_PTR, "bad pointer size %d", sz);
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22 return *(void **)p;
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23 }
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24 }
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25
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26 /* Set C data pointer. */
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27 static LJ_AINLINE void cdata_setptr(void *p, CTSize sz, const void *v)
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28 {
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29 if (LJ_64 && sz == 4) { /* Support 32 bit pointers on 64 bit targets. */
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30 *(uint32_t *)p = (uint32_t)(uintptr_t)v;
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31 } else {
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32 lj_assertX(sz == CTSIZE_PTR, "bad pointer size %d", sz);
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33 *(void **)p = (void *)v;
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34 }
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35 }
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36
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37 /* Allocate fixed-size C data object. */
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38 static LJ_AINLINE GCcdata *lj_cdata_new(CTState *cts, CTypeID id, CTSize sz)
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39 {
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40 GCcdata *cd;
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41 #ifdef LUA_USE_ASSERT
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42 CType *ct = ctype_raw(cts, id);
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43 lj_assertCTS((ctype_hassize(ct->info) ? ct->size : CTSIZE_PTR) == sz,
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44 "inconsistent size of fixed-size cdata alloc");
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45 #endif
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46 cd = (GCcdata *)lj_mem_newgco(cts->L, sizeof(GCcdata) + sz);
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47 cd->gct = ~LJ_TCDATA;
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48 cd->ctypeid = ctype_check(cts, id);
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49 return cd;
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50 }
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51
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52 /* Variant which works without a valid CTState. */
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53 static LJ_AINLINE GCcdata *lj_cdata_new_(lua_State *L, CTypeID id, CTSize sz)
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54 {
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55 GCcdata *cd = (GCcdata *)lj_mem_newgco(L, sizeof(GCcdata) + sz);
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56 cd->gct = ~LJ_TCDATA;
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57 cd->ctypeid = id;
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58 return cd;
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59 }
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60
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61 LJ_FUNC GCcdata *lj_cdata_newref(CTState *cts, const void *pp, CTypeID id);
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62 LJ_FUNC GCcdata *lj_cdata_newv(lua_State *L, CTypeID id, CTSize sz,
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63 CTSize align);
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64 LJ_FUNC GCcdata *lj_cdata_newx(CTState *cts, CTypeID id, CTSize sz,
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65 CTInfo info);
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66
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67 LJ_FUNC void LJ_FASTCALL lj_cdata_free(global_State *g, GCcdata *cd);
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68 LJ_FUNC void lj_cdata_setfin(lua_State *L, GCcdata *cd, GCobj *obj,
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69 uint32_t it);
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70
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71 LJ_FUNC CType *lj_cdata_index(CTState *cts, GCcdata *cd, cTValue *key,
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72 uint8_t **pp, CTInfo *qual);
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73 LJ_FUNC int lj_cdata_get(CTState *cts, CType *s, TValue *o, uint8_t *sp);
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74 LJ_FUNC void lj_cdata_set(CTState *cts, CType *d, uint8_t *dp, TValue *o,
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75 CTInfo qual);
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76
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77 #endif
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78
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79 #endif