misc/liblua/ldblib.c
author koda
Mon, 30 Aug 2010 01:38:46 +0200
changeset 3789 c3eb56754e92
parent 3697 d5b30d6373fc
child 10017 de822cd3df3a
permissions -rw-r--r--
added a smaller version of forts, fixed a couple of regressions
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/*
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** $Id: ldblib.c,v 1.104.1.3 2008/01/21 13:11:21 roberto Exp $
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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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   237
  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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   241
}
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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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   247
  if (!lua_istable(L, -1)) {
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    lua_pop(L, 1);
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   249
    lua_createtable(L, 0, 1);
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    lua_pushlightuserdata(L, (void *)&KEY_HOOK);
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   251
    lua_pushvalue(L, -2);
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    lua_rawset(L, LUA_REGISTRYINDEX);
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   253
  }
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}
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   256
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   257
static int db_sethook (lua_State *L) {
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   258
  int arg, mask, count;
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   259
  lua_Hook func;
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   260
  lua_State *L1 = getthread(L, &arg);
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   261
  if (lua_isnoneornil(L, arg+1)) {
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    lua_settop(L, arg+1);
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   263
    func = NULL; mask = 0; count = 0;  /* turn off hooks */
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   264
  }
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   265
  else {
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   266
    const char *smask = luaL_checkstring(L, arg+2);
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   267
    luaL_checktype(L, arg+1, LUA_TFUNCTION);
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   268
    count = luaL_optint(L, arg+3, 0);
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   269
    func = hookf; mask = makemask(smask, count);
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   270
  }
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   271
  gethooktable(L);
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   272
  lua_pushlightuserdata(L, L1);
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   273
  lua_pushvalue(L, arg+1);
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   274
  lua_rawset(L, -3);  /* set new hook */
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   275
  lua_pop(L, 1);  /* remove hook table */
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  lua_sethook(L1, func, mask, count);  /* set hooks */
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   277
  return 0;
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   278
}
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   279
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   280
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   281
static int db_gethook (lua_State *L) {
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   282
  int arg;
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   283
  lua_State *L1 = getthread(L, &arg);
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   284
  char buff[5];
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   285
  int mask = lua_gethookmask(L1);
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   286
  lua_Hook hook = lua_gethook(L1);
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   287
  if (hook != NULL && hook != hookf)  /* external hook? */
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   288
    lua_pushliteral(L, "external hook");
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   289
  else {
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   290
    gethooktable(L);
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   291
    lua_pushlightuserdata(L, L1);
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   292
    lua_rawget(L, -2);   /* get hook */
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   293
    lua_remove(L, -2);  /* remove hook table */
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   294
  }
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   295
  lua_pushstring(L, unmakemask(mask, buff));
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   296
  lua_pushinteger(L, lua_gethookcount(L1));
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   297
  return 3;
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   298
}
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   299
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   300
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   301
static int db_debug (lua_State *L) {
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   302
  for (;;) {
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   303
    char buffer[250];
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   304
    fputs("lua_debug> ", stderr);
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diff changeset
   305
    if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
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   306
        strcmp(buffer, "cont\n") == 0)
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   307
      return 0;
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   308
    if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
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koda
parents:
diff changeset
   309
        lua_pcall(L, 0, 0, 0)) {
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   310
      fputs(lua_tostring(L, -1), stderr);
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   311
      fputs("\n", stderr);
0a24853de796 add liblua to sources for macosx
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   312
    }
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   313
    lua_settop(L, 0);  /* remove eventual returns */
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   314
  }
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   315
}
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   316
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   317
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   318
#define LEVELS1	12	/* size of the first part of the stack */
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   319
#define LEVELS2	10	/* size of the second part of the stack */
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   320
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   321
static int db_errorfb (lua_State *L) {
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diff changeset
   322
  int level;
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koda
parents:
diff changeset
   323
  int firstpart = 1;  /* still before eventual `...' */
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koda
parents:
diff changeset
   324
  int arg;
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koda
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   325
  lua_State *L1 = getthread(L, &arg);
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koda
parents:
diff changeset
   326
  lua_Debug ar;
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koda
parents:
diff changeset
   327
  if (lua_isnumber(L, arg+2)) {
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koda
parents:
diff changeset
   328
    level = (int)lua_tointeger(L, arg+2);
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koda
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diff changeset
   329
    lua_pop(L, 1);
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koda
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diff changeset
   330
  }
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koda
parents:
diff changeset
   331
  else
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koda
parents:
diff changeset
   332
    level = (L == L1) ? 1 : 0;  /* level 0 may be this own function */
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koda
parents:
diff changeset
   333
  if (lua_gettop(L) == arg)
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koda
parents:
diff changeset
   334
    lua_pushliteral(L, "");
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parents:
diff changeset
   335
  else if (!lua_isstring(L, arg+1)) return 1;  /* message is not a string */
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koda
parents:
diff changeset
   336
  else lua_pushliteral(L, "\n");
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parents:
diff changeset
   337
  lua_pushliteral(L, "stack traceback:");
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koda
parents:
diff changeset
   338
  while (lua_getstack(L1, level++, &ar)) {
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koda
parents:
diff changeset
   339
    if (level > LEVELS1 && firstpart) {
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koda
parents:
diff changeset
   340
      /* no more than `LEVELS2' more levels? */
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koda
parents:
diff changeset
   341
      if (!lua_getstack(L1, level+LEVELS2, &ar))
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koda
parents:
diff changeset
   342
        level--;  /* keep going */
0a24853de796 add liblua to sources for macosx
koda
parents:
diff changeset
   343
      else {
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   344
        lua_pushliteral(L, "\n\t...");  /* too many levels */
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parents:
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   345
        while (lua_getstack(L1, level+LEVELS2, &ar))  /* find last levels */
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   346
          level++;
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   347
      }
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   348
      firstpart = 0;
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koda
parents:
diff changeset
   349
      continue;
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parents:
diff changeset
   350
    }
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parents:
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   351
    lua_pushliteral(L, "\n\t");
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koda
parents:
diff changeset
   352
    lua_getinfo(L1, "Snl", &ar);
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koda
parents:
diff changeset
   353
    lua_pushfstring(L, "%s:", ar.short_src);
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koda
parents:
diff changeset
   354
    if (ar.currentline > 0)
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parents:
diff changeset
   355
      lua_pushfstring(L, "%d:", ar.currentline);
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koda
parents:
diff changeset
   356
    if (*ar.namewhat != '\0')  /* is there a name? */
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koda
parents:
diff changeset
   357
        lua_pushfstring(L, " in function " LUA_QS, ar.name);
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parents:
diff changeset
   358
    else {
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      if (*ar.what == 'm')  /* main? */
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        lua_pushfstring(L, " in main chunk");
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   361
      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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   366
    }
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    lua_concat(L, lua_gettop(L) - arg);
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   368
  }
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  lua_concat(L, lua_gettop(L) - arg);
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  return 1;
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   371
}
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   372
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   373
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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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   380
  {"getregistry", db_getregistry},
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   381
  {"getmetatable", db_getmetatable},
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   382
  {"getupvalue", db_getupvalue},
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   383
  {"setfenv", db_setfenv},
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   384
  {"sethook", db_sethook},
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   385
  {"setlocal", db_setlocal},
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   386
  {"setmetatable", db_setmetatable},
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   387
  {"setupvalue", db_setupvalue},
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   388
  {"traceback", db_errorfb},
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   389
  {NULL, NULL}
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   390
};
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   391
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   392
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   393
LUALIB_API int luaopen_debug (lua_State *L) {
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  luaL_register(L, LUA_DBLIBNAME, dblib);
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   395
  return 1;
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   396
}
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   397