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1/*
2** Library function support.
3** Copyright (C) 2005-2009 Mike Pall. See Copyright Notice in luajit.h
4*/
5
6#ifndef _LJ_LIB_H
7#define _LJ_LIB_H
8
9#include "lj_obj.h"
10
11/*
12** A fallback handler is called by the assembler VM if the fast path fails:
13**
14** - too few arguments: unrecoverable.
15** - wrong argument type: recoverable, if coercion succeeds.
16** - bad argument value: unrecoverable.
17** - stack overflow: recoverable, if stack reallocation succeeds.
18** - extra handling: recoverable.
19**
20** The unrecoverable cases throw an error with lj_err_arg(), lj_err_argtype(),
21** lj_err_caller() or lj_err_callermsg().
22** The recoverable cases return 0 or the number of results + 1.
23** The assembler VM retries the fast path only if 0 is returned.
24** This time the fallback must not be called again or it gets stuck in a loop.
25*/
26
27/* Return values from fallback handler. */
28#define FFH_RETRY 0
29#define FFH_UNREACHABLE FFH_RETRY
30#define FFH_RES(n) ((n)+1)
31
32LJ_FUNC TValue *lj_lib_checkany(lua_State *L, int narg);
33LJ_FUNC GCstr *lj_lib_checkstr(lua_State *L, int narg);
34LJ_FUNC GCstr *lj_lib_optstr(lua_State *L, int narg);
35LJ_FUNC lua_Number lj_lib_checknum(lua_State *L, int narg);
36LJ_FUNC int32_t lj_lib_checkint(lua_State *L, int narg);
37LJ_FUNC int32_t lj_lib_optint(lua_State *L, int narg, int32_t def);
38LJ_FUNC GCfunc *lj_lib_checkfunc(lua_State *L, int narg);
39LJ_FUNC GCtab *lj_lib_checktab(lua_State *L, int narg);
40LJ_FUNC GCtab *lj_lib_checktabornil(lua_State *L, int narg);
41LJ_FUNC int lj_lib_checkopt(lua_State *L, int narg, int def, const char *lst);
42
43#define lj_lib_opt(L, narg, gotarg, noarg) \
44 { TValue *_o = L->base + (narg)-1; \
45 if (_o < L->top && !tvisnil(_o)) { gotarg } else { noarg } }
46
47/* Avoid including lj_frame.h. */
48#define lj_lib_upvalue(L, n) \
49 (&gcref((L->base-1)->fr.func)->fn.c.upvalue[(n)-1])
50
51/* Library function declarations. Scanned by buildvm. */
52#define LJLIB_CF(name) static int lj_cf_##name(lua_State *L)
53#define LJLIB_ASM(name) static int lj_ffh_##name(lua_State *L)
54#define LJLIB_ASM_(name)
55#define LJLIB_SET(name)
56#define LJLIB_PUSH(arg)
57#define LJLIB_REC(handler)
58#define LJLIB_NOREGUV
59#define LJLIB_NOREG
60
61#define LJ_LIB_REG(L, name) \
62 lj_lib_register(L, #name, lj_lib_init_##name, lj_lib_cf_##name)
63#define LJ_LIB_REG_(L, regname, name) \
64 lj_lib_register(L, regname, lj_lib_init_##name, lj_lib_cf_##name)
65
66LJ_FUNC void lj_lib_register(lua_State *L, const char *libname,
67 const uint8_t *init, const lua_CFunction *cf);
68
69/* Library init data tags. */
70#define LIBINIT_LENMASK 0x3f
71#define LIBINIT_TAGMASK 0xc0
72#define LIBINIT_CF 0x00
73#define LIBINIT_ASM 0x40
74#define LIBINIT_ASM_ 0x80
75#define LIBINIT_STRING 0xc0
76#define LIBINIT_MAXSTR 0x39
77#define LIBINIT_SET 0xfa
78#define LIBINIT_NUMBER 0xfb
79#define LIBINIT_COPY 0xfc
80#define LIBINIT_LASTCL 0xfd
81#define LIBINIT_FFID 0xfe
82#define LIBINIT_END 0xff
83
84#endif