lua-getsize

Introduction

This is a bundle of Matthew Wild's lua-getsize module with the necessary bits from Lua's sources (5.1, 5.2, 5.3, and 5.4) included to make it build as a standalone rock.

lua-getsize is MIT/X11-licensed. Lua's source code is available under the MIT license.

http://code.matthewwild.co.uk/lua-getsize/
http://www.lua.org/

At the moment the code in this repository includes the following changes to the original lua-getsize code:

• ported to Lua 5.2, 5.3 and 5.4
• fixed sizes of tables with empty hash part
• report a userdata's full memory not just its payload
• detect LuaJIT and raise an error
• additionally report the sizes of a table's array/hash parts
• additional option argument for counting shared internal objects like Lua upvalues and/or proto objects. "p" will count proto objects, "P" will not count proto objects (the default), "u" will count Lua upvalues (the default), and "U" will not count Lua upvalues. You can combine those options.

Getting Started

This module exports just one function:

local getsize = require("getsize")

Calling this function with a Lua value as argument will return the size of the value in bytes. For tables it will return the lengths of array and hash part as additional return values. For functions you can decide whether you want to include the sizes of the proto object and/or the upvalues.

print(getsize(getsize))                    --> 64
local function f() return getsize end
print(getsize(f))                          --> 80
print(getsize(f, "uP"))                    --> 80
print(getsize(f, "up"))                    --> 264
print(getsize(f, "UP"))                    --> 40
print(getsize({ 1, 2, 3, x = 4, y = 5 })   --> 152  3  2