f09a033160
Add a dedicated OP_LUSH A B instruction that loads shell C functions directly from the registry, eliminating the need for upvalue allocation in mainfunc(), upvalue population in lua_load(), and the fragile LUSH_NUM_UPVALS heuristic. Every chunk no longer carries 4 extra upvalues.
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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** $Id: linit.c $
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** Initialization of libraries for lua.c and other clients
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** See Copyright Notice in lua.h
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*/
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#define linit_c
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#define LUA_LIB
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#include "lprefix.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include "lua.h"
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#include "lualib.h"
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#include "lauxlib.h"
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#include "llimits.h"
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#include "lcmd.h"
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#include "lbuiltin.h"
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/*
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** Standard Libraries. (Must be listed in the same ORDER of their
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** respective constants LUA_<libname>K.)
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*/
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static const luaL_Reg stdlibs[] = {
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{LUA_GNAME, luaopen_base},
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{LUA_LOADLIBNAME, luaopen_package},
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{LUA_COLIBNAME, luaopen_coroutine},
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{LUA_DBLIBNAME, luaopen_debug},
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{LUA_IOLIBNAME, luaopen_io},
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{LUA_MATHLIBNAME, luaopen_math},
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{LUA_OSLIBNAME, luaopen_os},
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{LUA_STRLIBNAME, luaopen_string},
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{LUA_TABLIBNAME, luaopen_table},
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{LUA_UTF8LIBNAME, luaopen_utf8},
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{NULL, NULL}
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};
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/*
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** Store shell functions in a registry table at LUA_RIDX_LUSH.
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** Integer keys 1..4 hold the C functions (accessed by OP_LUSH).
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** String key "builtins" holds the builtins table (set by luaopen_builtins).
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*/
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static void opencommand (lua_State *L) {
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lua_createtable(L, LUSH_OP_COUNT, 1);
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lua_pushcfunction(L, lushCmd_command);
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lua_rawseti(L, -2, LUSH_OP_COMMAND + 1);
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lua_pushcfunction(L, lushCmd_interactive);
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lua_rawseti(L, -2, LUSH_OP_INTERACTIVE + 1);
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lua_pushcfunction(L, lushCmd_getenv);
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lua_rawseti(L, -2, LUSH_OP_GETENV + 1);
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lua_pushcfunction(L, lushCmd_setenv);
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lua_rawseti(L, -2, LUSH_OP_SETENV + 1);
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lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_LUSH);
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}
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/*
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** require and preload selected standard libraries
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*/
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LUALIB_API void luaL_openselectedlibs (lua_State *L, int load, int preload) {
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int mask;
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const luaL_Reg *lib;
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luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
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for (lib = stdlibs, mask = 1; lib->name != NULL; lib++, mask <<= 1) {
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if (load & mask) { /* selected? */
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luaL_requiref(L, lib->name, lib->func, 1); /* require library */
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lua_pop(L, 1); /* remove result from the stack */
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}
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else if (preload & mask) { /* selected? */
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lua_pushcfunction(L, lib->func);
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lua_setfield(L, -2, lib->name); /* add library to PRELOAD table */
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}
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}
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lua_assert((mask >> 1) == LUA_UTF8LIBK);
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lua_pop(L, 1); /* remove PRELOAD table */
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opencommand(L); /* register __command global */
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luaopen_builtins(L); /* register __builtins table */
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}
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