1 /* Copyright (c) 2010, 2012-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* SimGrid Lua bindings */
9 #include "lua_private.h"
10 #include <simgrid/host.h>
15 XBT_LOG_NEW_DEFAULT_CATEGORY(lua_host, "Lua Host module");
17 #define HOST_MODULE_NAME "simgrid.host"
18 #define HOST_FIELDNAME "__simgrid_host"
19 /* ********************************************************************************* */
20 /* simgrid.host API */
21 /* ********************************************************************************* */
23 /** @brief Ensures that the pointed stack value is an host userdatum and returns it.
25 * \param L a Lua state
26 * \param index an index in the Lua stack
27 * \return the C host corresponding to this Lua host
29 sg_host_t sglua_check_host(lua_State * L, int index)
31 luaL_checktype(L, index, LUA_TTABLE);
32 lua_getfield(L, index, HOST_FIELDNAME);
33 sg_host_t *pi = (sg_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
36 XBT_ERROR("luaL_checkudata() returned NULL");
39 luaL_error(L, "null Host");
44 * \brief Returns a host given its name. This is a lua function.
46 * \param L a Lua state
47 * \return number of values returned to Lua
49 * - Argument 1 (string): name of a host
50 * - Return value (host): the corresponding host will be pushed onto the stack
52 static int l_host_get_by_name(lua_State * L)
54 const char *name = luaL_checkstring(L, 1);
55 lua_remove(L, 1); /* remove the args from the stack */
57 sg_host_t host = sg_host_by_name(name);
58 lua_ensure(host, "No host name '%s' found.", name);
60 lua_newtable(L); /* table */
61 sg_host_t *lua_host = (sg_host_t *) lua_newuserdata(L, sizeof(sg_host_t)); /* table userdatum */
63 luaL_getmetatable(L, HOST_MODULE_NAME); /* table userdatum metatable */
64 lua_setmetatable(L, -2); /* table userdatum */
65 lua_setfield(L, -2, HOST_FIELDNAME); /* table -- put the userdata as field of the table */
71 * \brief Returns the name of a host.
72 * \param L a Lua state
73 * \return number of values returned to Lua
75 * - Argument 1 (host): a host
76 * - Return value (string): name of this host
78 static int l_host_get_name(lua_State * L)
80 sg_host_t ht = sglua_check_host(L, 1);
81 lua_pushstring(L, sg_host_get_name(ht));
86 * \brief Returns the number of existing hosts.
87 * \param L a Lua state
88 * \return number of values returned to Lua
90 * - Return value (number): number of hosts
92 static int l_host_number(lua_State * L)
94 xbt_dynar_t hosts = sg_hosts_as_dynar();
95 lua_pushinteger(L, xbt_dynar_length(hosts));
96 xbt_dynar_free(&hosts);
101 * \brief Returns the host given its index.
102 * \param L a Lua state
103 * \return number of values returned to Lua
105 * - Argument 1 (number): an index (1 is the first)
106 * - Return value (host): the host at this index
108 static int l_host_at(lua_State * L)
110 int index = luaL_checkinteger(L, 1);
111 xbt_dynar_t hosts = sg_hosts_as_dynar();
112 sg_host_t host = xbt_dynar_get_as(hosts,index - 1,sg_host_t);// lua indexing start by 1 (lua[1] <=> C[0])
113 lua_newtable(L); /* create a table, put the userdata on top of it */
114 sg_host_t *lua_host = (sg_host_t *) lua_newuserdata(L, sizeof(sg_host_t));
116 luaL_getmetatable(L, HOST_MODULE_NAME);
117 lua_setmetatable(L, -2);
118 lua_setfield(L, -2, HOST_FIELDNAME); /* put the userdata as field of the table */
119 xbt_dynar_free(&hosts);
124 * \brief Returns the value of a host property.
125 * \param L a Lua state
126 * \return number of values returned to Lua
128 * - Argument 1 (host): a host
129 * - Argument 2 (string): name of the property to get
130 * - Return value (string): the value of this property
132 static int l_host_get_property_value(lua_State * L)
134 sg_host_t ht = sglua_check_host(L, 1);
135 const char *prop = luaL_checkstring(L, 2);
136 lua_pushstring(L, sg_host_get_property_value(ht,prop));
141 * \brief Destroys a host.
142 * \param L a Lua state
143 * \return number of values returned to Lua
145 * - Argument 1 (host): the host to destroy
147 static int l_host_destroy(lua_State *L)
149 //sg_host_t ht = sglua_check_host(L, 1);
150 //FIXME: not working..__MSG_host_priv_free(MSG_host_priv(ht));
154 static const luaL_Reg host_functions[] = {
155 {"get_by_name", l_host_get_by_name},
156 {"name", l_host_get_name},
157 {"number", l_host_number},
159 {"get_prop_value", l_host_get_property_value},
160 {"destroy", l_host_destroy},
161 // Bypass XML Methods
162 {"set_property", console_host_set_property},
167 * \brief Returns a string representation of a host.
168 * \param L a Lua state
169 * \return number of values returned to Lua
171 * - Argument 1 (userdata): a host
172 * - Return value (string): a string describing this host
174 static int l_host_tostring(lua_State * L)
176 lua_pushfstring(L, "Host :%p", lua_touserdata(L, 1));
180 static const luaL_Reg host_meta[] = {
181 {"__tostring", l_host_tostring},
186 * \brief Registers the host functions into the table simgrid.host.
188 * Also initialize the metatable of the host userdata type.
190 * \param L a lua state
192 void sglua_register_host_functions(lua_State* L)
194 /* create a table simgrid.host and fill it with host functions */
195 lua_getglobal(L, "simgrid"); /* simgrid */
196 luaL_newlib(L, host_functions); /* simgrid simgrid.host */
197 lua_setfield(L, -2, "host"); /* simgrid */
198 lua_getfield(L, -1, "host"); /* simgrid simgrid.host */
200 /* create the metatable for host, add it to the Lua registry */
201 luaL_newmetatable(L, HOST_MODULE_NAME); /* simgrid simgrid.host mt */
203 /* fill the metatable */
204 luaL_setfuncs(L, host_meta, 0); /* simgrid simgrid.host mt */
207 * Copy the table and push it onto the stack.
208 * Required for the lua_setfield call below.
210 lua_getfield(L, -3, "host"); /* simgrid simgrid.host mt simgrid.host */
212 /* metatable.__index = simgrid.host
213 * we put the host functions inside the host userdata itself:
214 * this allows to write my_host:method(args) for
215 * simgrid.host.method(my_host, args) */
216 lua_setfield(L, -2, "__index"); /* simgrid simgrid.host mt */
218 lua_setmetatable(L, -2); /* simgrid simgrid.host */
219 lua_pop(L, 2); /* -- */