/* | |
** $Id: ldblib.c,v 1.132.1.1 2013/04/12 18:48:47 roberto Exp $ | |
** Interface from Lua to its debug API | |
** See Copyright Notice in lua.h | |
*/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#define ldblib_c | |
#define LUA_LIB | |
#include "lua.h" | |
#include "lauxlib.h" | |
#include "lualib.h" | |
#define HOOKKEY "_HKEY" | |
static int db_getregistry (lua_State *L) { | |
lua_pushvalue(L, LUA_REGISTRYINDEX); | |
return 1; | |
} | |
static int db_getmetatable (lua_State *L) { | |
luaL_checkany(L, 1); | |
if (!lua_getmetatable(L, 1)) { | |
lua_pushnil(L); /* no metatable */ | |
} | |
return 1; | |
} | |
static int db_setmetatable (lua_State *L) { | |
int t = lua_type(L, 2); | |
luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, | |
"nil or table expected"); | |
lua_settop(L, 2); | |
lua_setmetatable(L, 1); | |
return 1; /* return 1st argument */ | |
} | |
static int db_getuservalue (lua_State *L) { | |
if (lua_type(L, 1) != LUA_TUSERDATA) | |
lua_pushnil(L); | |
else | |
lua_getuservalue(L, 1); | |
return 1; | |
} | |
static int db_setuservalue (lua_State *L) { | |
if (lua_type(L, 1) == LUA_TLIGHTUSERDATA) | |
luaL_argerror(L, 1, "full userdata expected, got light userdata"); | |
luaL_checktype(L, 1, LUA_TUSERDATA); | |
if (!lua_isnoneornil(L, 2)) | |
luaL_checktype(L, 2, LUA_TTABLE); | |
lua_settop(L, 2); | |
lua_setuservalue(L, 1); | |
return 1; | |
} | |
static void settabss (lua_State *L, const char *i, const char *v) { | |
lua_pushstring(L, v); | |
lua_setfield(L, -2, i); | |
} | |
static void settabsi (lua_State *L, const char *i, int v) { | |
lua_pushinteger(L, v); | |
lua_setfield(L, -2, i); | |
} | |
static void settabsb (lua_State *L, const char *i, int v) { | |
lua_pushboolean(L, v); | |
lua_setfield(L, -2, i); | |
} | |
static lua_State *getthread (lua_State *L, int *arg) { | |
if (lua_isthread(L, 1)) { | |
*arg = 1; | |
return lua_tothread(L, 1); | |
} | |
else { | |
*arg = 0; | |
return L; | |
} | |
} | |
static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) { | |
if (L == L1) { | |
lua_pushvalue(L, -2); | |
lua_remove(L, -3); | |
} | |
else | |
lua_xmove(L1, L, 1); | |
lua_setfield(L, -2, fname); | |
} | |
static int db_getinfo (lua_State *L) { | |
lua_Debug ar; | |
int arg; | |
lua_State *L1 = getthread(L, &arg); | |
const char *options = luaL_optstring(L, arg+2, "flnStu"); | |
if (lua_isnumber(L, arg+1)) { | |
if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) { | |
lua_pushnil(L); /* level out of range */ | |
return 1; | |
} | |
} | |
else if (lua_isfunction(L, arg+1)) { | |
lua_pushfstring(L, ">%s", options); | |
options = lua_tostring(L, -1); | |
lua_pushvalue(L, arg+1); | |
lua_xmove(L, L1, 1); | |
} | |
else | |
return luaL_argerror(L, arg+1, "function or level expected"); | |
if (!lua_getinfo(L1, options, &ar)) | |
return luaL_argerror(L, arg+2, "invalid option"); | |
lua_createtable(L, 0, 2); | |
if (strchr(options, 'S')) { | |
settabss(L, "source", ar.source); | |
settabss(L, "short_src", ar.short_src); | |
settabsi(L, "linedefined", ar.linedefined); | |
settabsi(L, "lastlinedefined", ar.lastlinedefined); | |
settabss(L, "what", ar.what); | |
} | |
if (strchr(options, 'l')) | |
settabsi(L, "currentline", ar.currentline); | |
if (strchr(options, 'u')) { | |
settabsi(L, "nups", ar.nups); | |
settabsi(L, "nparams", ar.nparams); | |
settabsb(L, "isvararg", ar.isvararg); | |
} | |
if (strchr(options, 'n')) { | |
settabss(L, "name", ar.name); | |
settabss(L, "namewhat", ar.namewhat); | |
} | |
if (strchr(options, 't')) | |
settabsb(L, "istailcall", ar.istailcall); | |
if (strchr(options, 'L')) | |
treatstackoption(L, L1, "activelines"); | |
if (strchr(options, 'f')) | |
treatstackoption(L, L1, "func"); | |
return 1; /* return table */ | |
} | |
static int db_getlocal (lua_State *L) { | |
int arg; | |
lua_State *L1 = getthread(L, &arg); | |
lua_Debug ar; | |
const char *name; | |
int nvar = luaL_checkint(L, arg+2); /* local-variable index */ | |
if (lua_isfunction(L, arg + 1)) { /* function argument? */ | |
lua_pushvalue(L, arg + 1); /* push function */ | |
lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */ | |
return 1; | |
} | |
else { /* stack-level argument */ | |
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ | |
return luaL_argerror(L, arg+1, "level out of range"); | |
name = lua_getlocal(L1, &ar, nvar); | |
if (name) { | |
lua_xmove(L1, L, 1); /* push local value */ | |
lua_pushstring(L, name); /* push name */ | |
lua_pushvalue(L, -2); /* re-order */ | |
return 2; | |
} | |
else { | |
lua_pushnil(L); /* no name (nor value) */ | |
return 1; | |
} | |
} | |
} | |
static int db_setlocal (lua_State *L) { | |
int arg; | |
lua_State *L1 = getthread(L, &arg); | |
lua_Debug ar; | |
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ | |
return luaL_argerror(L, arg+1, "level out of range"); | |
luaL_checkany(L, arg+3); | |
lua_settop(L, arg+3); | |
lua_xmove(L, L1, 1); | |
lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2))); | |
return 1; | |
} | |
static int auxupvalue (lua_State *L, int get) { | |
const char *name; | |
int n = luaL_checkint(L, 2); | |
luaL_checktype(L, 1, LUA_TFUNCTION); | |
name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n); | |
if (name == NULL) return 0; | |
lua_pushstring(L, name); | |
lua_insert(L, -(get+1)); | |
return get + 1; | |
} | |
static int db_getupvalue (lua_State *L) { | |
return auxupvalue(L, 1); | |
} | |
static int db_setupvalue (lua_State *L) { | |
luaL_checkany(L, 3); | |
return auxupvalue(L, 0); | |
} | |
static int checkupval (lua_State *L, int argf, int argnup) { | |
lua_Debug ar; | |
int nup = luaL_checkint(L, argnup); | |
luaL_checktype(L, argf, LUA_TFUNCTION); | |
lua_pushvalue(L, argf); | |
lua_getinfo(L, ">u", &ar); | |
luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index"); | |
return nup; | |
} | |
static int db_upvalueid (lua_State *L) { | |
int n = checkupval(L, 1, 2); | |
lua_pushlightuserdata(L, lua_upvalueid(L, 1, n)); | |
return 1; | |
} | |
static int db_upvaluejoin (lua_State *L) { | |
int n1 = checkupval(L, 1, 2); | |
int n2 = checkupval(L, 3, 4); | |
luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected"); | |
luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected"); | |
lua_upvaluejoin(L, 1, n1, 3, n2); | |
return 0; | |
} | |
#define gethooktable(L) luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY) | |
static void hookf (lua_State *L, lua_Debug *ar) { | |
static const char *const hooknames[] = | |
{"call", "return", "line", "count", "tail call"}; | |
gethooktable(L); | |
lua_pushthread(L); | |
lua_rawget(L, -2); | |
if (lua_isfunction(L, -1)) { | |
lua_pushstring(L, hooknames[(int)ar->event]); | |
if (ar->currentline >= 0) | |
lua_pushinteger(L, ar->currentline); | |
else lua_pushnil(L); | |
lua_assert(lua_getinfo(L, "lS", ar)); | |
lua_call(L, 2, 0); | |
} | |
} | |
static int makemask (const char *smask, int count) { | |
int mask = 0; | |
if (strchr(smask, 'c')) mask |= LUA_MASKCALL; | |
if (strchr(smask, 'r')) mask |= LUA_MASKRET; | |
if (strchr(smask, 'l')) mask |= LUA_MASKLINE; | |
if (count > 0) mask |= LUA_MASKCOUNT; | |
return mask; | |
} | |
static char *unmakemask (int mask, char *smask) { | |
int i = 0; | |
if (mask & LUA_MASKCALL) smask[i++] = 'c'; | |
if (mask & LUA_MASKRET) smask[i++] = 'r'; | |
if (mask & LUA_MASKLINE) smask[i++] = 'l'; | |
smask[i] = '\0'; | |
return smask; | |
} | |
static int db_sethook (lua_State *L) { | |
int arg, mask, count; | |
lua_Hook func; | |
lua_State *L1 = getthread(L, &arg); | |
if (lua_isnoneornil(L, arg+1)) { | |
lua_settop(L, arg+1); | |
func = NULL; mask = 0; count = 0; /* turn off hooks */ | |
} | |
else { | |
const char *smask = luaL_checkstring(L, arg+2); | |
luaL_checktype(L, arg+1, LUA_TFUNCTION); | |
count = luaL_optint(L, arg+3, 0); | |
func = hookf; mask = makemask(smask, count); | |
} | |
if (gethooktable(L) == 0) { /* creating hook table? */ | |
lua_pushstring(L, "k"); | |
lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */ | |
lua_pushvalue(L, -1); | |
lua_setmetatable(L, -2); /* setmetatable(hooktable) = hooktable */ | |
} | |
lua_pushthread(L1); lua_xmove(L1, L, 1); | |
lua_pushvalue(L, arg+1); | |
lua_rawset(L, -3); /* set new hook */ | |
lua_sethook(L1, func, mask, count); /* set hooks */ | |
return 0; | |
} | |
static int db_gethook (lua_State *L) { | |
int arg; | |
lua_State *L1 = getthread(L, &arg); | |
char buff[5]; | |
int mask = lua_gethookmask(L1); | |
lua_Hook hook = lua_gethook(L1); | |
if (hook != NULL && hook != hookf) /* external hook? */ | |
lua_pushliteral(L, "external hook"); | |
else { | |
gethooktable(L); | |
lua_pushthread(L1); lua_xmove(L1, L, 1); | |
lua_rawget(L, -2); /* get hook */ | |
lua_remove(L, -2); /* remove hook table */ | |
} | |
lua_pushstring(L, unmakemask(mask, buff)); | |
lua_pushinteger(L, lua_gethookcount(L1)); | |
return 3; | |
} | |
static int db_debug (lua_State *L) { | |
for (;;) { | |
char buffer[250]; | |
luai_writestringerror("%s", "lua_debug> "); | |
if (fgets(buffer, sizeof(buffer), stdin) == 0 || | |
strcmp(buffer, "cont\n") == 0) | |
return 0; | |
if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || | |
lua_pcall(L, 0, 0, 0)) | |
luai_writestringerror("%s\n", lua_tostring(L, -1)); | |
lua_settop(L, 0); /* remove eventual returns */ | |
} | |
} | |
static int db_traceback (lua_State *L) { | |
int arg; | |
lua_State *L1 = getthread(L, &arg); | |
const char *msg = lua_tostring(L, arg + 1); | |
if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */ | |
lua_pushvalue(L, arg + 1); /* return it untouched */ | |
else { | |
int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0); | |
luaL_traceback(L, L1, msg, level); | |
} | |
return 1; | |
} | |
static const luaL_Reg dblib[] = { | |
{"debug", db_debug}, | |
{"getuservalue", db_getuservalue}, | |
{"gethook", db_gethook}, | |
{"getinfo", db_getinfo}, | |
{"getlocal", db_getlocal}, | |
{"getregistry", db_getregistry}, | |
{"getmetatable", db_getmetatable}, | |
{"getupvalue", db_getupvalue}, | |
{"upvaluejoin", db_upvaluejoin}, | |
{"upvalueid", db_upvalueid}, | |
{"setuservalue", db_setuservalue}, | |
{"sethook", db_sethook}, | |
{"setlocal", db_setlocal}, | |
{"setmetatable", db_setmetatable}, | |
{"setupvalue", db_setupvalue}, | |
{"traceback", db_traceback}, | |
{NULL, NULL} | |
}; | |
LUAMOD_API int luaopen_debug (lua_State *L) { | |
luaL_newlib(L, dblib); | |
return 1; | |
} | |