mirror of
https://github.com/lua/lua.git
synced 2024-11-24 02:33:48 +08:00
356 lines
8.4 KiB
C
356 lines
8.4 KiB
C
/*
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** $Id: ldblib.c,v 1.108 2008/01/18 17:14:47 roberto Exp roberto $
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** Interface from Lua to its debug API
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** See Copyright Notice in lua.h
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define ldblib_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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static int db_getregistry (lua_State *L) {
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lua_pushvalue(L, LUA_REGISTRYINDEX);
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return 1;
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}
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static int db_getmetatable (lua_State *L) {
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luaL_checkany(L, 1);
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if (!lua_getmetatable(L, 1)) {
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lua_pushnil(L); /* no metatable */
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}
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return 1;
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}
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static int db_setmetatable (lua_State *L) {
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int t = lua_type(L, 2);
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luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
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"nil or table expected");
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lua_settop(L, 2);
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lua_pushboolean(L, lua_setmetatable(L, 1));
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return 1;
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}
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static int db_getfenv (lua_State *L) {
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lua_getfenv(L, 1);
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return 1;
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}
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static int db_setfenv (lua_State *L) {
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luaL_checktype(L, 2, LUA_TTABLE);
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lua_settop(L, 2);
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if (lua_setfenv(L, 1) == 0)
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luaL_error(L, LUA_QL("setfenv")
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" cannot change environment of given object");
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return 1;
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}
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static void settabss (lua_State *L, const char *i, const char *v) {
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lua_pushstring(L, v);
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lua_setfield(L, -2, i);
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}
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static void settabsi (lua_State *L, const char *i, int v) {
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lua_pushinteger(L, v);
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lua_setfield(L, -2, i);
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}
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static lua_State *getthread (lua_State *L, int *arg) {
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if (lua_isthread(L, 1)) {
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*arg = 1;
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return lua_tothread(L, 1);
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}
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else {
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*arg = 0;
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return L;
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}
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}
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static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
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if (L == L1) {
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lua_pushvalue(L, -2);
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lua_remove(L, -3);
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}
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else
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lua_xmove(L1, L, 1);
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lua_setfield(L, -2, fname);
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}
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static int db_getinfo (lua_State *L) {
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lua_Debug ar;
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int arg;
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lua_State *L1 = getthread(L, &arg);
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const char *options = luaL_optstring(L, arg+2, "flnSu");
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if (lua_isnumber(L, arg+1)) {
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if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
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lua_pushnil(L); /* level out of range */
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return 1;
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}
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}
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else if (lua_isfunction(L, arg+1)) {
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lua_pushfstring(L, ">%s", options);
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options = lua_tostring(L, -1);
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lua_pushvalue(L, arg+1);
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lua_xmove(L, L1, 1);
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}
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else
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return luaL_argerror(L, arg+1, "function or level expected");
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if (!lua_getinfo(L1, options, &ar))
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return luaL_argerror(L, arg+2, "invalid option");
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lua_createtable(L, 0, 2);
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if (strchr(options, 'S')) {
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settabss(L, "source", ar.source);
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settabss(L, "short_src", ar.short_src);
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settabsi(L, "linedefined", ar.linedefined);
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settabsi(L, "lastlinedefined", ar.lastlinedefined);
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settabss(L, "what", ar.what);
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}
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if (strchr(options, 'l'))
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settabsi(L, "currentline", ar.currentline);
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if (strchr(options, 'u'))
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settabsi(L, "nups", ar.nups);
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if (strchr(options, 'n')) {
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settabss(L, "name", ar.name);
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settabss(L, "namewhat", ar.namewhat);
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}
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if (strchr(options, 'L'))
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treatstackoption(L, L1, "activelines");
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if (strchr(options, 'f'))
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treatstackoption(L, L1, "func");
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return 1; /* return table */
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}
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static int db_getlocal (lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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lua_Debug ar;
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const char *name;
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if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
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return luaL_argerror(L, arg+1, "level out of range");
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name = lua_getlocal(L1, &ar, luaL_checkint(L, arg+2));
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if (name) {
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lua_xmove(L1, L, 1);
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lua_pushstring(L, name);
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lua_pushvalue(L, -2);
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return 2;
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}
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else {
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lua_pushnil(L);
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return 1;
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}
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}
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static int db_setlocal (lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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lua_Debug ar;
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if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
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return luaL_argerror(L, arg+1, "level out of range");
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luaL_checkany(L, arg+3);
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lua_settop(L, arg+3);
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lua_xmove(L, L1, 1);
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lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
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return 1;
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}
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static int auxupvalue (lua_State *L, int get) {
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const char *name;
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int n = luaL_checkint(L, 2);
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luaL_checktype(L, 1, LUA_TFUNCTION);
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if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */
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name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
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if (name == NULL) return 0;
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lua_pushstring(L, name);
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lua_insert(L, -(get+1));
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return get + 1;
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}
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static int db_getupvalue (lua_State *L) {
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return auxupvalue(L, 1);
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}
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static int db_setupvalue (lua_State *L) {
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luaL_checkany(L, 3);
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return auxupvalue(L, 0);
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}
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static const char KEY_HOOK = 'h';
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static void hookf (lua_State *L, lua_Debug *ar) {
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static const char *const hooknames[] =
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{"call", "return", "line", "count", "tail return"};
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lua_pushlightuserdata(L, (void *)&KEY_HOOK);
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lua_rawget(L, LUA_REGISTRYINDEX);
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lua_pushlightuserdata(L, L);
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lua_rawget(L, -2);
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if (lua_isfunction(L, -1)) {
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lua_pushstring(L, hooknames[(int)ar->event]);
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if (ar->currentline >= 0)
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lua_pushinteger(L, ar->currentline);
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else lua_pushnil(L);
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lua_assert(lua_getinfo(L, "lS", ar));
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lua_call(L, 2, 0);
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}
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}
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static int makemask (const char *smask, int count) {
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int mask = 0;
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if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
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if (strchr(smask, 'r')) mask |= LUA_MASKRET;
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if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
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if (count > 0) mask |= LUA_MASKCOUNT;
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return mask;
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}
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static char *unmakemask (int mask, char *smask) {
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int i = 0;
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if (mask & LUA_MASKCALL) smask[i++] = 'c';
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if (mask & LUA_MASKRET) smask[i++] = 'r';
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if (mask & LUA_MASKLINE) smask[i++] = 'l';
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smask[i] = '\0';
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return smask;
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}
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static void gethooktable (lua_State *L) {
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lua_pushlightuserdata(L, (void *)&KEY_HOOK);
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lua_rawget(L, LUA_REGISTRYINDEX);
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if (!lua_istable(L, -1)) {
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lua_pop(L, 1);
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lua_createtable(L, 0, 1);
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lua_pushlightuserdata(L, (void *)&KEY_HOOK);
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lua_pushvalue(L, -2);
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lua_rawset(L, LUA_REGISTRYINDEX);
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}
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}
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static int db_sethook (lua_State *L) {
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int arg, mask, count;
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lua_Hook func;
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lua_State *L1 = getthread(L, &arg);
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if (lua_isnoneornil(L, arg+1)) {
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lua_settop(L, arg+1);
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func = NULL; mask = 0; count = 0; /* turn off hooks */
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}
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else {
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const char *smask = luaL_checkstring(L, arg+2);
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luaL_checktype(L, arg+1, LUA_TFUNCTION);
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count = luaL_optint(L, arg+3, 0);
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func = hookf; mask = makemask(smask, count);
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}
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gethooktable(L);
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lua_pushlightuserdata(L, L1);
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lua_pushvalue(L, arg+1);
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lua_rawset(L, -3); /* set new hook */
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lua_pop(L, 1); /* remove hook table */
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lua_sethook(L1, func, mask, count); /* set hooks */
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return 0;
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}
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static int db_gethook (lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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char buff[5];
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int mask = lua_gethookmask(L1);
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lua_Hook hook = lua_gethook(L1);
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if (hook != NULL && hook != hookf) /* external hook? */
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lua_pushliteral(L, "external hook");
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else {
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gethooktable(L);
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lua_pushlightuserdata(L, L1);
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lua_rawget(L, -2); /* get hook */
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lua_remove(L, -2); /* remove hook table */
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}
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lua_pushstring(L, unmakemask(mask, buff));
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lua_pushinteger(L, lua_gethookcount(L1));
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return 3;
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}
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static int db_debug (lua_State *L) {
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for (;;) {
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char buffer[250];
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fputs("lua_debug> ", stderr);
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if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
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strcmp(buffer, "cont\n") == 0)
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return 0;
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if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
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lua_pcall(L, 0, 0, 0)) {
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fputs(lua_tostring(L, -1), stderr);
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fputs("\n", stderr);
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}
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lua_settop(L, 0); /* remove eventual returns */
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}
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}
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static int db_errorfb (lua_State *L) {
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int arg;
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lua_State *L1 = getthread(L, &arg);
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const char *msg = lua_tostring(L, arg + 1);
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if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
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lua_pushvalue(L, arg + 1); /* return it untouched */
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else {
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int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);
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luaL_traceback(L, L1, msg, level);
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}
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return 1;
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}
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static const luaL_Reg dblib[] = {
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{"debug", db_debug},
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{"getfenv", db_getfenv},
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{"gethook", db_gethook},
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{"getinfo", db_getinfo},
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{"getlocal", db_getlocal},
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{"getregistry", db_getregistry},
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{"getmetatable", db_getmetatable},
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{"getupvalue", db_getupvalue},
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{"setfenv", db_setfenv},
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{"sethook", db_sethook},
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{"setlocal", db_setlocal},
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{"setmetatable", db_setmetatable},
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{"setupvalue", db_setupvalue},
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{"traceback", db_errorfb},
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{NULL, NULL}
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};
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LUALIB_API int luaopen_debug (lua_State *L) {
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luaL_register(L, LUA_DBLIBNAME, dblib);
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return 1;
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}
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