Lua: Difference between revisions
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{{Software | {{Software | ||
|name = Lua | |name = Lua | ||
|image = Lua-Logo.svg.png | |||
|type = Library | |type = Library | ||
|authors = Roberto Ierusalimschy | |authors = Roberto Ierusalimschy | ||
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In WoW Lua, each variable contains a taint value, a string that identifies the AddOn from where the variable originated. | In WoW Lua, each variable contains a taint value, a string that identifies the AddOn from where the variable originated. | ||
=== Profiling === | |||
Because each variable is taint-tagged by whichever AddOn generated it, WoW Lua is able to compute the memory usage of any particular AddOn. | |||
<pre> | |||
void lua_gcupdatesizes(lua_State* L); | |||
lu_mem lua_gcgetsize(lua_State* L, const char* tag); | |||
</pre> | |||
Optionally, function performance can be profiled by turning on a flag (which is governed by the <code>scriptProfile</code> CVar). | |||
You can read the results of the function profiler with: | |||
<pre> | |||
void lua_gcupdatetimes(lua_State* L); | |||
lua_Number lua_gcgettime(lua_State* L, const char* tag); | |||
void lua_gcgetfunctiontime(lua_State* L, lua_Number* flat, lua_Number* total, int32_t* ncalls); | |||
void lua_gcresettimes(lua_State* L); | |||
</pre> | |||
=== Standard library === | === Standard library === | ||
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* <code>print()</code> - Removed to prevent Lua from touching stdout. This is replaced by a function that prints output to the ingame chat. | * <code>print()</code> - Removed to prevent Lua from touching stdout. This is replaced by a function that prints output to the ingame chat. | ||
* <code>math.randomseed()</code> | |||
* <code>string.sub()</code> | |||
These existing standard library functions were modified: | |||
* <code>getfenv()</code> - Implementation adds this code to end of function: <code>luaL_getmetafield(L, -1, "__environment");</code> | |||
* <code>string.upper()</code>, <code>string.lower()</code> - These were modified to support UTF-8 strings. Unlike stock Lua, they are able to convert special characters including Latin-1 and Cyrillic. | |||
These standard library functions were added by Blizzard: | |||
* <code>table.removemulti()</code> | |||
* <code>table.wipe()</code> | |||