1/*
2** C type conversions.
3** Copyright (C) 2005-2021 Mike Pall. See Copyright Notice in luajit.h
4*/
5
6#ifndef _LJ_CCONV_H
7#define _LJ_CCONV_H
8
9#include "lj_obj.h"
10#include "lj_ctype.h"
11
12#if LJ_HASFFI
13
14/* Compressed C type index. ORDER CCX. */
15enum {
16 CCX_B, /* Bool. */
17 CCX_I, /* Integer. */
18 CCX_F, /* Floating-point number. */
19 CCX_C, /* Complex. */
20 CCX_V, /* Vector. */
21 CCX_P, /* Pointer. */
22 CCX_A, /* Refarray. */
23 CCX_S /* Struct/union. */
24};
25
26/* Convert C type info to compressed C type index. ORDER CT. ORDER CCX. */
27static LJ_AINLINE uint32_t cconv_idx(CTInfo info)
28{
29 uint32_t idx = ((info >> 26) & 15u); /* Dispatch bits. */
30 lj_assertX(ctype_type(info) <= CT_MAYCONVERT,
31 "cannot convert ctype %08x", info);
32#if LJ_64
33 idx = ((uint32_t)(U64x(f436fff5,fff7f021) >> 4*idx) & 15u);
34#else
35 idx = (((idx < 8 ? 0xfff7f021u : 0xf436fff5) >> 4*(idx & 7u)) & 15u);
36#endif
37 lj_assertX(idx < 8, "cannot convert ctype %08x", info);
38 return idx;
39}
40
41#define cconv_idx2(dinfo, sinfo) \
42 ((cconv_idx((dinfo)) << 3) + cconv_idx((sinfo)))
43
44#define CCX(dst, src) ((CCX_##dst << 3) + CCX_##src)
45
46/* Conversion flags. */
47#define CCF_CAST 0x00000001u
48#define CCF_FROMTV 0x00000002u
49#define CCF_SAME 0x00000004u
50#define CCF_IGNQUAL 0x00000008u
51
52#define CCF_ARG_SHIFT 8
53#define CCF_ARG(n) ((n) << CCF_ARG_SHIFT)
54#define CCF_GETARG(f) ((f) >> CCF_ARG_SHIFT)
55
56LJ_FUNC int lj_cconv_compatptr(CTState *cts, CType *d, CType *s, CTInfo flags);
57LJ_FUNC void lj_cconv_ct_ct(CTState *cts, CType *d, CType *s,
58 uint8_t *dp, uint8_t *sp, CTInfo flags);
59LJ_FUNC int lj_cconv_tv_ct(CTState *cts, CType *s, CTypeID sid,
60 TValue *o, uint8_t *sp);
61LJ_FUNC int lj_cconv_tv_bf(CTState *cts, CType *s, TValue *o, uint8_t *sp);
62LJ_FUNC void lj_cconv_ct_tv(CTState *cts, CType *d,
63 uint8_t *dp, TValue *o, CTInfo flags);
64LJ_FUNC void lj_cconv_bf_tv(CTState *cts, CType *d, uint8_t *dp, TValue *o);
65LJ_FUNC int lj_cconv_multi_init(CTState *cts, CType *d, TValue *o);
66LJ_FUNC void lj_cconv_ct_init(CTState *cts, CType *d, CTSize sz,
67 uint8_t *dp, TValue *o, MSize len);
68
69#endif
70
71#endif
72