mirror of
https://github.com/lua/lua
synced 2024-11-25 22:29:39 +03:00
346 lines
8.6 KiB
C
346 lines
8.6 KiB
C
/*
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** $Id: ldblib.c,v 1.87 2004/08/13 18:02:36 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 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 int 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_newtable(L);
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for (; *options; options++) {
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switch (*options) {
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case '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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settabss(L, "what", ar.what);
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break;
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case 'l':
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settabsi(L, "currentline", ar.currentline);
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break;
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case 'u':
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settabsi(L, "nups", ar.nups);
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break;
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case 'n':
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settabss(L, "name", ar.name);
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settabss(L, "namewhat", ar.namewhat);
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break;
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case 'f':
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if (L == L1)
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lua_pushvalue(L, -2);
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else
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lua_xmove(L1, L, 1);
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lua_setfield(L, -2, "func");
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break;
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}
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}
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return 1; /* return table */
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}
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static int 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 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 getupvalue (lua_State *L) {
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return auxupvalue(L, 1);
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}
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static int 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_newtable(L);
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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 sethook (lua_State *L) {
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int arg;
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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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lua_sethook(L1, NULL, 0, 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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int count = luaL_optint(L, arg+3, 0);
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luaL_checktype(L, arg+1, LUA_TFUNCTION);
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lua_sethook(L1, hookf, makemask(smask, count), count);
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}
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gethooktable(L1);
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lua_pushlightuserdata(L1, L1);
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lua_pushvalue(L, arg+1);
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lua_xmove(L, L1, 1);
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lua_rawset(L1, -3); /* set new hook */
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lua_pop(L1, 1); /* remove hook table */
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return 0;
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}
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static int 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(L1);
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lua_pushlightuserdata(L1, L1);
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lua_rawget(L1, -2); /* get hook */
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lua_remove(L1, -2); /* remove hook table */
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lua_xmove(L1, L, 1);
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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 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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#define LEVELS1 12 /* size of the first part of the stack */
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#define LEVELS2 10 /* size of the second part of the stack */
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static int errorfb (lua_State *L) {
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int level = 0;
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int firstpart = 1; /* still before eventual `...' */
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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 (L == L1) level++; /* skip level 0 (it's this function) */
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if (lua_gettop(L) == arg)
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lua_pushliteral(L, "");
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else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */
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else lua_pushliteral(L, "\n");
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lua_pushliteral(L, "stack traceback:");
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while (lua_getstack(L1, level++, &ar)) {
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if (level > LEVELS1 && firstpart) {
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/* no more than `LEVELS2' more levels? */
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if (!lua_getstack(L1, level+LEVELS2, &ar))
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level--; /* keep going */
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else {
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lua_pushliteral(L, "\n\t..."); /* too many levels */
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while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */
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level++;
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}
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firstpart = 0;
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continue;
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}
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lua_pushliteral(L, "\n\t");
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lua_getinfo(L1, "Snl", &ar);
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lua_pushfstring(L, "%s:", ar.short_src);
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if (ar.currentline > 0)
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lua_pushfstring(L, "%d:", ar.currentline);
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if (*ar.namewhat != '\0') /* is there a name? */
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lua_pushfstring(L, " in function `%s'", ar.name);
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else {
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if (*ar.what == 'm') /* main? */
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lua_pushfstring(L, " in main chunk");
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else if (*ar.what == 'C' || *ar.what == 't')
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lua_pushliteral(L, " ?"); /* C function or tail call */
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else
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lua_pushfstring(L, " in function <%s:%d>",
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ar.short_src, ar.linedefined);
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}
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lua_concat(L, lua_gettop(L) - arg);
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}
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lua_concat(L, lua_gettop(L) - arg);
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return 1;
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}
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static const luaL_reg dblib[] = {
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{"getlocal", getlocal},
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{"getinfo", getinfo},
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{"gethook", gethook},
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{"getupvalue", getupvalue},
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{"sethook", sethook},
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{"setlocal", setlocal},
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{"setupvalue", setupvalue},
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{"debug", debug},
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{"traceback", 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_openlib(L, LUA_DBLIBNAME, dblib, 0);
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lua_pushcfunction(L, errorfb);
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lua_setglobal(L, "_TRACEBACK");
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return 1;
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}
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