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/*
** Library function support.
** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_LIB_H
#define _LJ_LIB_H
#include "lj_obj.h"
/*
** A fallback handler is called by the assembler VM if the fast path fails:
**
** - too few arguments: unrecoverable.
** - wrong argument type: recoverable, if coercion succeeds.
** - bad argument value: unrecoverable.
** - stack overflow: recoverable, if stack reallocation succeeds.
** - extra handling: recoverable.
**
** The unrecoverable cases throw an error with lj_err_arg(), lj_err_argtype(),
** lj_err_caller() or lj_err_callermsg().
** The recoverable cases return 0 or the number of results + 1.
** The assembler VM retries the fast path only if 0 is returned.
** This time the fallback must not be called again or it gets stuck in a loop.
*/
/* Return values from fallback handler. */
#define FFH_RETRY 0
#define FFH_UNREACHABLE FFH_RETRY
#define FFH_RES(n) ((n)+1)
#define FFH_TAILCALL (-1)
LJ_FUNC TValue *lj_lib_checkany(lua_State *L, int narg);
LJ_FUNC GCstr *lj_lib_checkstr(lua_State *L, int narg);
LJ_FUNC GCstr *lj_lib_optstr(lua_State *L, int narg);
#if LJ_DUALNUM
LJ_FUNC void lj_lib_checknumber(lua_State *L, int narg);
#else
#define lj_lib_checknumber(L, narg) lj_lib_checknum((L), (narg))
#endif
LJ_FUNC lua_Number lj_lib_checknum(lua_State *L, int narg);
LJ_FUNC int32_t lj_lib_checkint(lua_State *L, int narg);
LJ_FUNC int32_t lj_lib_optint(lua_State *L, int narg, int32_t def);
LJ_FUNC GCfunc *lj_lib_checkfunc(lua_State *L, int narg);
LJ_FUNC GCtab *lj_lib_checktab(lua_State *L, int narg);
LJ_FUNC GCtab *lj_lib_checktabornil(lua_State *L, int narg);
LJ_FUNC int lj_lib_checkopt(lua_State *L, int narg, int def, const char *lst);
#if LJ_HASBUFFER
LJ_FUNC GCstr *lj_lib_checkstrx(lua_State *L, int narg);
LJ_FUNC int32_t lj_lib_checkintrange(lua_State *L, int narg,
int32_t a, int32_t b);
#endif
/* Avoid including lj_frame.h. */
#if LJ_GC64
#define lj_lib_upvalue(L, n) \
(&gcval(L->base-2)->fn.c.upvalue[(n)-1])
#elif LJ_FR2
#define lj_lib_upvalue(L, n) \
(&gcref((L->base-2)->gcr)->fn.c.upvalue[(n)-1])
#else
#define lj_lib_upvalue(L, n) \
(&gcref((L->base-1)->fr.func)->fn.c.upvalue[(n)-1])
#endif
#if LJ_TARGET_WINDOWS
#define lj_lib_checkfpu(L) \
do { setnumV(L->top++, (lua_Number)1437217655); \
if (lua_tointeger(L, -1) != 1437217655) lj_err_caller(L, LJ_ERR_BADFPU); \
L->top--; } while (0)
#else
#define lj_lib_checkfpu(L) UNUSED(L)
#endif
LJ_FUNC GCfunc *lj_lib_pushcc(lua_State *L, lua_CFunction f, int id, int n);
#define lj_lib_pushcf(L, fn, id) (lj_lib_pushcc(L, (fn), (id), 0))
/* Library function declarations. Scanned by buildvm. */
#define LJLIB_CF(name) static int lj_cf_##name(lua_State *L)
#define LJLIB_ASM(name) static int lj_ffh_##name(lua_State *L)
#define LJLIB_ASM_(name)
#define LJLIB_LUA(name)
#define LJLIB_SET(name)
#define LJLIB_PUSH(arg)
#define LJLIB_REC(handler)
#define LJLIB_NOREGUV
#define LJLIB_NOREG
#define LJ_LIB_REG(L, regname, name) \
lj_lib_register(L, regname, lj_lib_init_##name, lj_lib_cf_##name)
LJ_FUNC void lj_lib_register(lua_State *L, const char *libname,
const uint8_t *init, const lua_CFunction *cf);
LJ_FUNC void lj_lib_prereg(lua_State *L, const char *name, lua_CFunction f,
GCtab *env);
LJ_FUNC int lj_lib_postreg(lua_State *L, lua_CFunction cf, int id,
const char *name);
/* Library init data tags. */
#define LIBINIT_LENMASK 0x3f
#define LIBINIT_TAGMASK 0xc0
#define LIBINIT_CF 0x00
#define LIBINIT_ASM 0x40
#define LIBINIT_ASM_ 0x80
#define LIBINIT_STRING 0xc0
#define LIBINIT_MAXSTR 0x38
#define LIBINIT_LUA 0xf9
#define LIBINIT_SET 0xfa
#define LIBINIT_NUMBER 0xfb
#define LIBINIT_COPY 0xfc
#define LIBINIT_LASTCL 0xfd
#define LIBINIT_FFID 0xfe
#define LIBINIT_END 0xff
#endif
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