36 lines
1.9 KiB
Plaintext
36 lines
1.9 KiB
Plaintext
= render "pages/rubyx/menu"
|
|
|
|
%h1= title "Parfait, a minimal runtime"
|
|
|
|
%h3#type-and-class Type and Class
|
|
%p
|
|
Each object has a type that describes the instance variables and basic types of the object.
|
|
Types also reference the class they implement.
|
|
Type objects are unique and constant, may not be changed over their lifetime.
|
|
When a field is added to a class, a new Type is created. For a given class and combination
|
|
of instance names and basic types, only one instance every exists describing that type (a bit
|
|
similar to symbols)
|
|
%p
|
|
A Class describes a set of objects that respond to the same methods (the methods source is stored
|
|
in the RubyMethod class).
|
|
A Type describes a set of objects that have the same instance variables.
|
|
%h3#method-message-and-frame Method, Message and Frame
|
|
%p
|
|
The TypedMethod class describes a callable method. It carries a name, argument and local variable
|
|
type and several descriptions of the code.
|
|
The typed ast is kept for debugging, the register model instruction stream for optimisation
|
|
and further processing and finally the cpu specific binary
|
|
represents the executable code.
|
|
%p
|
|
When TypedMethods are invoked, A message object (instance of Message class) is populated.
|
|
Message objects are created at compile time and form a linked list.
|
|
The data in the Message holds the receiver, return addresses, arguments and a frame.
|
|
Frames are also created at compile time and just reused at runtime.
|
|
%h3#space-and-support Space and support
|
|
%p
|
|
The single instance of Space hold a list of all Types and all Classes, which in turn hold
|
|
the methods.
|
|
Also the space holds messages and will hold memory management objects like pages.
|
|
%p Words represent short immutable text and other word processing (buffers, text) is still tbd.
|
|
%p Lists (aka Array) are number indexed, starting at one, and dictionaries (aka Hash) are mappings from words to objects.
|