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>
11 #include <simgrid/s4u/host.hpp>
16 XBT_LOG_NEW_DEFAULT_CATEGORY(lua_host, "Lua Host module");
18 #define HOST_MODULE_NAME "simgrid.host"
19 #define HOST_FIELDNAME "__simgrid_host"
20 /* ********************************************************************************* */
21 /* simgrid.host API */
22 /* ********************************************************************************* */
24 /** @brief Ensures that the pointed stack value is an host userdatum and returns it.
26 * \param L a Lua state
27 * \param index an index in the Lua stack
28 * \return the C host corresponding to this Lua host
30 sg_host_t sglua_check_host(lua_State * L, int index)
32 luaL_checktype(L, index, LUA_TTABLE);
33 lua_getfield(L, index, HOST_FIELDNAME);
34 sg_host_t *pi = (sg_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
37 XBT_ERROR("luaL_checkudata() returned nullptr");
40 luaL_error(L, "null Host");
45 * \brief Returns a host given its name. This is a lua function.
47 * \param L a Lua state
48 * \return number of values returned to Lua
50 * - Argument 1 (string): name of a host
51 * - Return value (host): the corresponding host will be pushed onto the stack
53 static int l_host_get_by_name(lua_State * L)
55 const char *name = luaL_checkstring(L, 1);
56 lua_remove(L, 1); /* remove the args from the stack */
58 sg_host_t host = sg_host_by_name(name);
59 lua_ensure(host, "No host name '%s' found.", name);
61 lua_newtable(L); /* table */
62 sg_host_t *lua_host = (sg_host_t *) lua_newuserdata(L, sizeof(sg_host_t)); /* table userdatum */
64 luaL_getmetatable(L, HOST_MODULE_NAME); /* table userdatum metatable */
65 lua_setmetatable(L, -2); /* table userdatum */
66 lua_setfield(L, -2, HOST_FIELDNAME); /* table -- put the userdata as field of the table */
72 * \brief Returns the name of a host.
73 * \param L a Lua state
74 * \return number of values returned to Lua
76 * - Argument 1 (host): a host
77 * - Return value (string): name of this host
79 static int l_host_get_name(lua_State * L)
81 sg_host_t ht = sglua_check_host(L, 1);
82 lua_pushstring(L, ht->cname());
87 * \brief Returns the number of existing hosts.
88 * \param L a Lua state
89 * \return number of values returned to Lua
91 * - Return value (number): number of hosts
93 static int l_host_number(lua_State * L)
95 xbt_dynar_t hosts = sg_hosts_as_dynar();
96 lua_pushinteger(L, xbt_dynar_length(hosts));
97 xbt_dynar_free(&hosts);
102 * \brief Returns the host given its index.
103 * \param L a Lua state
104 * \return number of values returned to Lua
106 * - Argument 1 (number): an index (1 is the first)
107 * - Return value (host): the host at this index
109 static int l_host_at(lua_State * L)
111 int index = luaL_checkinteger(L, 1);
112 xbt_dynar_t hosts = sg_hosts_as_dynar();
113 sg_host_t host = xbt_dynar_get_as(hosts,index - 1,sg_host_t);// lua indexing start by 1 (lua[1] <=> C[0])
114 lua_newtable(L); /* create a table, put the userdata on top of it */
115 sg_host_t *lua_host = (sg_host_t *) lua_newuserdata(L, sizeof(sg_host_t));
117 luaL_getmetatable(L, HOST_MODULE_NAME);
118 lua_setmetatable(L, -2);
119 lua_setfield(L, -2, HOST_FIELDNAME); /* put the userdata as field of the table */
120 xbt_dynar_free(&hosts);
125 * \brief Returns the value of a host property.
126 * \param L a Lua state
127 * \return number of values returned to Lua
129 * - Argument 1 (host): a host
130 * - Argument 2 (string): name of the property to get
131 * - Return value (string): the value of this property
133 static int l_host_get_property_value(lua_State * L)
135 sg_host_t ht = sglua_check_host(L, 1);
136 const char *prop = luaL_checkstring(L, 2);
137 lua_pushstring(L, sg_host_get_property_value(ht,prop));
142 * \brief Destroys a host.
143 * \param L a Lua state
144 * \return number of values returned to Lua
146 * - Argument 1 (host): the host to destroy
148 static int l_host_destroy(lua_State *L)
150 //sg_host_t ht = sglua_check_host(L, 1);
151 //FIXME: not working..__MSG_host_priv_free(MSG_host_priv(ht));
155 static const luaL_Reg host_functions[] = {
156 {"get_by_name", l_host_get_by_name},
157 {"name", l_host_get_name},
158 {"number", l_host_number},
160 {"get_prop_value", l_host_get_property_value},
161 {"destroy", l_host_destroy},
162 // Bypass XML Methods
163 {"set_property", console_host_set_property},
168 * \brief Returns a string representation of a host.
169 * \param L a Lua state
170 * \return number of values returned to Lua
172 * - Argument 1 (userdata): a host
173 * - Return value (string): a string describing this host
175 static int l_host_tostring(lua_State * L)
177 lua_pushfstring(L, "Host :%p", lua_touserdata(L, 1));
181 static const luaL_Reg host_meta[] = {
182 {"__tostring", l_host_tostring},
187 * \brief Registers the host functions into the table simgrid.host.
189 * Also initialize the metatable of the host userdata type.
191 * \param L a lua state
193 void sglua_register_host_functions(lua_State* L)
195 /* create a table simgrid.host and fill it with host functions */
196 lua_getglobal(L, "simgrid"); /* simgrid */
197 luaL_newlib(L, host_functions); /* simgrid simgrid.host */
198 lua_setfield(L, -2, "host"); /* simgrid */
199 lua_getfield(L, -1, "host"); /* simgrid simgrid.host */
201 /* create the metatable for host, add it to the Lua registry */
202 luaL_newmetatable(L, HOST_MODULE_NAME); /* simgrid simgrid.host mt */
204 /* fill the metatable */
205 luaL_setfuncs(L, host_meta, 0); /* simgrid simgrid.host mt */
208 * Copy the table and push it onto the stack.
209 * Required for the lua_setfield call below.
211 lua_getfield(L, -3, "host"); /* simgrid simgrid.host mt simgrid.host */
213 /* metatable.__index = simgrid.host
214 * we put the host functions inside the host userdata itself:
215 * this allows to write my_host:method(args) for
216 * simgrid.host.method(my_host, args) */
217 lua_setfield(L, -2, "__index"); /* simgrid simgrid.host mt */
219 lua_setmetatable(L, -2); /* simgrid simgrid.host */
220 lua_pop(L, 2); /* -- */