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  1. /*
  2. ** $Id: ldblib.c $
  3. ** Interface from Lua to its debug API
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #define ldblib_c
  8. #define LUA_LIB
  9.  
  10. #include "lprefix.h"
  11.  
  12.  
  13. #include <stdio.h>
  14. #include <stdlib.h>
  15. #include <string.h>
  16.  
  17. #include "lua.h"
  18.  
  19. #include "lauxlib.h"
  20. #include "lualib.h"
  21.  
  22.  
  23. /*
  24. ** The hook table at registry[HOOKKEY] maps threads to their current
  25. ** hook function.
  26. */
  27. static const char *const HOOKKEY = "_HOOKKEY";
  28.  
  29.  
  30. /*
  31. ** If L1 != L, L1 can be in any state, and therefore there are no
  32. ** guarantees about its stack space; any push in L1 must be
  33. ** checked.
  34. */
  35. static void checkstack (lua_State *L, lua_State *L1, int n) {
  36.   if (l_unlikely(L != L1 && !lua_checkstack(L1, n)))
  37.     luaL_error(L, "stack overflow");
  38. }
  39.  
  40.  
  41. static int db_getregistry (lua_State *L) {
  42.   lua_pushvalue(L, LUA_REGISTRYINDEX);
  43.   return 1;
  44. }
  45.  
  46.  
  47. static int db_getmetatable (lua_State *L) {
  48.   luaL_checkany(L, 1);
  49.   if (!lua_getmetatable(L, 1)) {
  50.     lua_pushnil(L);  /* no metatable */
  51.   }
  52.   return 1;
  53. }
  54.  
  55.  
  56. static int db_setmetatable (lua_State *L) {
  57.   int t = lua_type(L, 2);
  58.   luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
  59.   lua_settop(L, 2);
  60.   lua_setmetatable(L, 1);
  61.   return 1;  /* return 1st argument */
  62. }
  63.  
  64.  
  65. static int db_getuservalue (lua_State *L) {
  66.   int n = (int)luaL_optinteger(L, 2, 1);
  67.   if (lua_type(L, 1) != LUA_TUSERDATA)
  68.     luaL_pushfail(L);
  69.   else if (lua_getiuservalue(L, 1, n) != LUA_TNONE) {
  70.     lua_pushboolean(L, 1);
  71.     return 2;
  72.   }
  73.   return 1;
  74. }
  75.  
  76.  
  77. static int db_setuservalue (lua_State *L) {
  78.   int n = (int)luaL_optinteger(L, 3, 1);
  79.   luaL_checktype(L, 1, LUA_TUSERDATA);
  80.   luaL_checkany(L, 2);
  81.   lua_settop(L, 2);
  82.   if (!lua_setiuservalue(L, 1, n))
  83.     luaL_pushfail(L);
  84.   return 1;
  85. }
  86.  
  87.  
  88. /*
  89. ** Auxiliary function used by several library functions: check for
  90. ** an optional thread as function's first argument and set 'arg' with
  91. ** 1 if this argument is present (so that functions can skip it to
  92. ** access their other arguments)
  93. */
  94. static lua_State *getthread (lua_State *L, int *arg) {
  95.   if (lua_isthread(L, 1)) {
  96.     *arg = 1;
  97.     return lua_tothread(L, 1);
  98.   }
  99.   else {
  100.     *arg = 0;
  101.     return L;  /* function will operate over current thread */
  102.   }
  103. }
  104.  
  105.  
  106. /*
  107. ** Variations of 'lua_settable', used by 'db_getinfo' to put results
  108. ** from 'lua_getinfo' into result table. Key is always a string;
  109. ** value can be a string, an int, or a boolean.
  110. */
  111. static void settabss (lua_State *L, const char *k, const char *v) {
  112.   lua_pushstring(L, v);
  113.   lua_setfield(L, -2, k);
  114. }
  115.  
  116. static void settabsi (lua_State *L, const char *k, int v) {
  117.   lua_pushinteger(L, v);
  118.   lua_setfield(L, -2, k);
  119. }
  120.  
  121. static void settabsb (lua_State *L, const char *k, int v) {
  122.   lua_pushboolean(L, v);
  123.   lua_setfield(L, -2, k);
  124. }
  125.  
  126.  
  127. /*
  128. ** In function 'db_getinfo', the call to 'lua_getinfo' may push
  129. ** results on the stack; later it creates the result table to put
  130. ** these objects. Function 'treatstackoption' puts the result from
  131. ** 'lua_getinfo' on top of the result table so that it can call
  132. ** 'lua_setfield'.
  133. */
  134. static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
  135.   if (L == L1)
  136.     lua_rotate(L, -2, 1);  /* exchange object and table */
  137.   else
  138.     lua_xmove(L1, L, 1);  /* move object to the "main" stack */
  139.   lua_setfield(L, -2, fname);  /* put object into table */
  140. }
  141.  
  142.  
  143. /*
  144. ** Calls 'lua_getinfo' and collects all results in a new table.
  145. ** L1 needs stack space for an optional input (function) plus
  146. ** two optional outputs (function and line table) from function
  147. ** 'lua_getinfo'.
  148. */
  149. static int db_getinfo (lua_State *L) {
  150.   lua_Debug ar;
  151.   int arg;
  152.   lua_State *L1 = getthread(L, &arg);
  153.   const char *options = luaL_optstring(L, arg+2, "flnSrtu");
  154.   checkstack(L, L1, 3);
  155.   luaL_argcheck(L, options[0] != '>', arg + 2, "invalid option '>'");
  156.   if (lua_isfunction(L, arg + 1)) {  /* info about a function? */
  157.     options = lua_pushfstring(L, ">%s", options);  /* add '>' to 'options' */
  158.     lua_pushvalue(L, arg + 1);  /* move function to 'L1' stack */
  159.     lua_xmove(L, L1, 1);
  160.   }
  161.   else {  /* stack level */
  162.     if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) {
  163.       luaL_pushfail(L);  /* level out of range */
  164.       return 1;
  165.     }
  166.   }
  167.   if (!lua_getinfo(L1, options, &ar))
  168.     return luaL_argerror(L, arg+2, "invalid option");
  169.   lua_newtable(L);  /* table to collect results */
  170.   if (strchr(options, 'S')) {
  171.     lua_pushlstring(L, ar.source, ar.srclen);
  172.     lua_setfield(L, -2, "source");
  173.     settabss(L, "short_src", ar.short_src);
  174.     settabsi(L, "linedefined", ar.linedefined);
  175.     settabsi(L, "lastlinedefined", ar.lastlinedefined);
  176.     settabss(L, "what", ar.what);
  177.   }
  178.   if (strchr(options, 'l'))
  179.     settabsi(L, "currentline", ar.currentline);
  180.   if (strchr(options, 'u')) {
  181.     settabsi(L, "nups", ar.nups);
  182.     settabsi(L, "nparams", ar.nparams);
  183.     settabsb(L, "isvararg", ar.isvararg);
  184.   }
  185.   if (strchr(options, 'n')) {
  186.     settabss(L, "name", ar.name);
  187.     settabss(L, "namewhat", ar.namewhat);
  188.   }
  189.   if (strchr(options, 'r')) {
  190.     settabsi(L, "ftransfer", ar.ftransfer);
  191.     settabsi(L, "ntransfer", ar.ntransfer);
  192.   }
  193.   if (strchr(options, 't'))
  194.     settabsb(L, "istailcall", ar.istailcall);
  195.   if (strchr(options, 'L'))
  196.     treatstackoption(L, L1, "activelines");
  197.   if (strchr(options, 'f'))
  198.     treatstackoption(L, L1, "func");
  199.   return 1;  /* return table */
  200. }
  201.  
  202.  
  203. static int db_getlocal (lua_State *L) {
  204.   int arg;
  205.   lua_State *L1 = getthread(L, &arg);
  206.   int nvar = (int)luaL_checkinteger(L, arg + 2);  /* local-variable index */
  207.   if (lua_isfunction(L, arg + 1)) {  /* function argument? */
  208.     lua_pushvalue(L, arg + 1);  /* push function */
  209.     lua_pushstring(L, lua_getlocal(L, NULL, nvar));  /* push local name */
  210.     return 1;  /* return only name (there is no value) */
  211.   }
  212.   else {  /* stack-level argument */
  213.     lua_Debug ar;
  214.     const char *name;
  215.     int level = (int)luaL_checkinteger(L, arg + 1);
  216.     if (l_unlikely(!lua_getstack(L1, level, &ar)))  /* out of range? */
  217.       return luaL_argerror(L, arg+1, "level out of range");
  218.     checkstack(L, L1, 1);
  219.     name = lua_getlocal(L1, &ar, nvar);
  220.     if (name) {
  221.       lua_xmove(L1, L, 1);  /* move local value */
  222.       lua_pushstring(L, name);  /* push name */
  223.       lua_rotate(L, -2, 1);  /* re-order */
  224.       return 2;
  225.     }
  226.     else {
  227.       luaL_pushfail(L);  /* no name (nor value) */
  228.       return 1;
  229.     }
  230.   }
  231. }
  232.  
  233.  
  234. static int db_setlocal (lua_State *L) {
  235.   int arg;
  236.   const char *name;
  237.   lua_State *L1 = getthread(L, &arg);
  238.   lua_Debug ar;
  239.   int level = (int)luaL_checkinteger(L, arg + 1);
  240.   int nvar = (int)luaL_checkinteger(L, arg + 2);
  241.   if (l_unlikely(!lua_getstack(L1, level, &ar)))  /* out of range? */
  242.     return luaL_argerror(L, arg+1, "level out of range");
  243.   luaL_checkany(L, arg+3);
  244.   lua_settop(L, arg+3);
  245.   checkstack(L, L1, 1);
  246.   lua_xmove(L, L1, 1);
  247.   name = lua_setlocal(L1, &ar, nvar);
  248.   if (name == NULL)
  249.     lua_pop(L1, 1);  /* pop value (if not popped by 'lua_setlocal') */
  250.   lua_pushstring(L, name);
  251.   return 1;
  252. }
  253.  
  254.  
  255. /*
  256. ** get (if 'get' is true) or set an upvalue from a closure
  257. */
  258. static int auxupvalue (lua_State *L, int get) {
  259.   const char *name;
  260.   int n = (int)luaL_checkinteger(L, 2);  /* upvalue index */
  261.   luaL_checktype(L, 1, LUA_TFUNCTION);  /* closure */
  262.   name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
  263.   if (name == NULL) return 0;
  264.   lua_pushstring(L, name);
  265.   lua_insert(L, -(get+1));  /* no-op if get is false */
  266.   return get + 1;
  267. }
  268.  
  269.  
  270. static int db_getupvalue (lua_State *L) {
  271.   return auxupvalue(L, 1);
  272. }
  273.  
  274.  
  275. static int db_setupvalue (lua_State *L) {
  276.   luaL_checkany(L, 3);
  277.   return auxupvalue(L, 0);
  278. }
  279.  
  280.  
  281. /*
  282. ** Check whether a given upvalue from a given closure exists and
  283. ** returns its index
  284. */
  285. static void *checkupval (lua_State *L, int argf, int argnup, int *pnup) {
  286.   void *id;
  287.   int nup = (int)luaL_checkinteger(L, argnup);  /* upvalue index */
  288.   luaL_checktype(L, argf, LUA_TFUNCTION);  /* closure */
  289.   id = lua_upvalueid(L, argf, nup);
  290.   if (pnup) {
  291.     luaL_argcheck(L, id != NULL, argnup, "invalid upvalue index");
  292.     *pnup = nup;
  293.   }
  294.   return id;
  295. }
  296.  
  297.  
  298. static int db_upvalueid (lua_State *L) {
  299.   void *id = checkupval(L, 1, 2, NULL);
  300.   if (id != NULL)
  301.     lua_pushlightuserdata(L, id);
  302.   else
  303.     luaL_pushfail(L);
  304.   return 1;
  305. }
  306.  
  307.  
  308. static int db_upvaluejoin (lua_State *L) {
  309.   int n1, n2;
  310.   checkupval(L, 1, 2, &n1);
  311.   checkupval(L, 3, 4, &n2);
  312.   luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
  313.   luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
  314.   lua_upvaluejoin(L, 1, n1, 3, n2);
  315.   return 0;
  316. }
  317.  
  318.  
  319. /*
  320. ** Call hook function registered at hook table for the current
  321. ** thread (if there is one)
  322. */
  323. static void hookf (lua_State *L, lua_Debug *ar) {
  324.   static const char *const hooknames[] =
  325.     {"call", "return", "line", "count", "tail call"};
  326.   lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
  327.   lua_pushthread(L);
  328.   if (lua_rawget(L, -2) == LUA_TFUNCTION) {  /* is there a hook function? */
  329.     lua_pushstring(L, hooknames[(int)ar->event]);  /* push event name */
  330.     if (ar->currentline >= 0)
  331.       lua_pushinteger(L, ar->currentline);  /* push current line */
  332.     else lua_pushnil(L);
  333.     lua_assert(lua_getinfo(L, "lS", ar));
  334.     lua_call(L, 2, 0);  /* call hook function */
  335.   }
  336. }
  337.  
  338.  
  339. /*
  340. ** Convert a string mask (for 'sethook') into a bit mask
  341. */
  342. static int makemask (const char *smask, int count) {
  343.   int mask = 0;
  344.   if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
  345.   if (strchr(smask, 'r')) mask |= LUA_MASKRET;
  346.   if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
  347.   if (count > 0) mask |= LUA_MASKCOUNT;
  348.   return mask;
  349. }
  350.  
  351.  
  352. /*
  353. ** Convert a bit mask (for 'gethook') into a string mask
  354. */
  355. static char *unmakemask (int mask, char *smask) {
  356.   int i = 0;
  357.   if (mask & LUA_MASKCALL) smask[i++] = 'c';
  358.   if (mask & LUA_MASKRET) smask[i++] = 'r';
  359.   if (mask & LUA_MASKLINE) smask[i++] = 'l';
  360.   smask[i] = '\0';
  361.   return smask;
  362. }
  363.  
  364.  
  365. static int db_sethook (lua_State *L) {
  366.   int arg, mask, count;
  367.   lua_Hook func;
  368.   lua_State *L1 = getthread(L, &arg);
  369.   if (lua_isnoneornil(L, arg+1)) {  /* no hook? */
  370.     lua_settop(L, arg+1);
  371.     func = NULL; mask = 0; count = 0;  /* turn off hooks */
  372.   }
  373.   else {
  374.     const char *smask = luaL_checkstring(L, arg+2);
  375.     luaL_checktype(L, arg+1, LUA_TFUNCTION);
  376.     count = (int)luaL_optinteger(L, arg + 3, 0);
  377.     func = hookf; mask = makemask(smask, count);
  378.   }
  379.   if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) {
  380.     /* table just created; initialize it */
  381.     lua_pushliteral(L, "k");
  382.     lua_setfield(L, -2, "__mode");  /** hooktable.__mode = "k" */
  383.     lua_pushvalue(L, -1);
  384.     lua_setmetatable(L, -2);  /* metatable(hooktable) = hooktable */
  385.   }
  386.   checkstack(L, L1, 1);
  387.   lua_pushthread(L1); lua_xmove(L1, L, 1);  /* key (thread) */
  388.   lua_pushvalue(L, arg + 1);  /* value (hook function) */
  389.   lua_rawset(L, -3);  /* hooktable[L1] = new Lua hook */
  390.   lua_sethook(L1, func, mask, count);
  391.   return 0;
  392. }
  393.  
  394.  
  395. static int db_gethook (lua_State *L) {
  396.   int arg;
  397.   lua_State *L1 = getthread(L, &arg);
  398.   char buff[5];
  399.   int mask = lua_gethookmask(L1);
  400.   lua_Hook hook = lua_gethook(L1);
  401.   if (hook == NULL) {  /* no hook? */
  402.     luaL_pushfail(L);
  403.     return 1;
  404.   }
  405.   else if (hook != hookf)  /* external hook? */
  406.     lua_pushliteral(L, "external hook");
  407.   else {  /* hook table must exist */
  408.     lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
  409.     checkstack(L, L1, 1);
  410.     lua_pushthread(L1); lua_xmove(L1, L, 1);
  411.     lua_rawget(L, -2);   /* 1st result = hooktable[L1] */
  412.     lua_remove(L, -2);  /* remove hook table */
  413.   }
  414.   lua_pushstring(L, unmakemask(mask, buff));  /* 2nd result = mask */
  415.   lua_pushinteger(L, lua_gethookcount(L1));  /* 3rd result = count */
  416.   return 3;
  417. }
  418.  
  419.  
  420. static int db_debug (lua_State *L) {
  421.   for (;;) {
  422.     char buffer[250];
  423.     lua_writestringerror("%s", "lua_debug> ");
  424.     if (fgets(buffer, sizeof(buffer), stdin) == NULL ||
  425.         strcmp(buffer, "cont\n") == 0)
  426.       return 0;
  427.     if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
  428.         lua_pcall(L, 0, 0, 0))
  429.       lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL));
  430.     lua_settop(L, 0);  /* remove eventual returns */
  431.   }
  432. }
  433.  
  434.  
  435. static int db_traceback (lua_State *L) {
  436.   int arg;
  437.   lua_State *L1 = getthread(L, &arg);
  438.   const char *msg = lua_tostring(L, arg + 1);
  439.   if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */
  440.     lua_pushvalue(L, arg + 1);  /* return it untouched */
  441.   else {
  442.     int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0);
  443.     luaL_traceback(L, L1, msg, level);
  444.   }
  445.   return 1;
  446. }
  447.  
  448.  
  449. static int db_setcstacklimit (lua_State *L) {
  450.   int limit = (int)luaL_checkinteger(L, 1);
  451.   int res = lua_setcstacklimit(L, limit);
  452.   lua_pushinteger(L, res);
  453.   return 1;
  454. }
  455.  
  456.  
  457. static const luaL_Reg dblib[] = {
  458.   {"debug", db_debug},
  459.   {"getuservalue", db_getuservalue},
  460.   {"gethook", db_gethook},
  461.   {"getinfo", db_getinfo},
  462.   {"getlocal", db_getlocal},
  463.   {"getregistry", db_getregistry},
  464.   {"getmetatable", db_getmetatable},
  465.   {"getupvalue", db_getupvalue},
  466.   {"upvaluejoin", db_upvaluejoin},
  467.   {"upvalueid", db_upvalueid},
  468.   {"setuservalue", db_setuservalue},
  469.   {"sethook", db_sethook},
  470.   {"setlocal", db_setlocal},
  471.   {"setmetatable", db_setmetatable},
  472.   {"setupvalue", db_setupvalue},
  473.   {"traceback", db_traceback},
  474.   {"setcstacklimit", db_setcstacklimit},
  475.   {NULL, NULL}
  476. };
  477.  
  478.  
  479. LUAMOD_API int luaopen_debug (lua_State *L) {
  480.   luaL_newlib(L, dblib);
  481.   return 1;
  482. }
  483.  
  484.