1 The Programming Language Lua
The Lua Interpreter
Syntax and such
Modules
2 Embedding Lua in C Programs
State Manipulation
Calling C from Lua
Calling Lua from C
3 Lua in the NetBSD Kernel
Use Cases
Implementation Overview
Implementation Details
The Programming Language Lua
The Lua Interpreter
Running from C
int luaL do le(lua State *L, const char * lename)
int luaL dostring(lua State *L, const char *str)
Syntax and such
Values, Variables, and, Data Types
Variables have no type
Values do have a type
Functions are rst-class values
Tables
Tables are THE data structure in Lua
Nice constructor syntax
Tables make Lua a good DDL
Metatables can be associated with every object
Lua Table Constructor
Create and initialize a table, access a eld:
mytable = {
name = ‘Marc’,
surname = ‘Balmer’,
email = ‘m@x.org’
}
print(mytable.email)
Modules
Extending Lua Programs
Acess GPIO pins from Lua:
require ‘gpio’
g = gpio.open(‘/dev/gpio0’)
g:write(4, gpio.PIN_HIGH)
g:close()
Embedding Lua in C Programs
State Manipulation
Calling a C Function
Function has been registered in luaopen module()
int function(lua State *L)
Parameters popped from the stack
Return values pushed on the stack
Return Nr. of return values
Calling a Lua Function
Find the function and make sure is *is* a function
Push parameters on the stack
Use lua call(lua State *L, int index)
or lua pcall(lua State *L, int index)
Pop return values from the stack
…
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Lua in the NetBSD Kernel (1,37 MO) (Cours PDF)
