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Classes in the Mist
1.
Martin is getting the
projector to work with his laptop.
2.
Classes in the
Mist A Non- Traditional Smalltalk Gets Classy Martin McClure
3.
There is no
“I” in “Team”
4.
There is no
“C” in “Smalltalk”
5.
Mist •Open-source (MIT) •mist-project.org (see previous
videos) •Github
6.
Status (overview)
7.
Status (overview) Why Now?
8.
Values •Self-sufficiency •Simplicity •Consistency •Speed •Craziness
9.
Self-Sufficiency
10.
Minimize Dependencies
11.
Minimize Dependencies Maximize Interoperability
12.
Simplicity
13.
Consistency
14.
Speed
15.
Craziness
16.
“If you aren't
doing some things that are crazy, you're doing the wrong things” Larry Page, Google CEO
17.
Values •Self-sufficiency •Simplicity •Consistency •Speed •Craziness
18.
Strategies •Spend memory freely •Start
simple •Broad solutions •Unconventional first •Go for the 80/20
19.
Implementation
20.
Initial Target X86_64 Linux
21.
Mist compiles to Fog compiles to machine
code
22.
Primitives are written
directly in Fog
23.
Executable image
24.
Fully Dynamic
25.
Object Headers
26.
Object Headers NO
27.
Object Headers Instance Variables
28.
Memory Management
29.
30.
Garbage Collection gcMark isGcMarked ifFalse: [isGcMarked := true. self allReferencesDo: [:each | each gcMark]] gcSweep isGcMarked ifTrue: [isGcMarked := false] ifFalse: [|size| size := self physicalSize. class := FreeSpace. self physicalSize: size. TheObjectManager add: self toFreeListForSize: size]
31.
Tail Call Elimination
32.
Loop using recursion SmallInteger to: limit byPositive: increment do: aBlock | nextIndex | aBlock value: self. nextIndex := self + increment. ^ nextIndex > limit ifFalse: [nextIndex to: limit byPositive: increment do: aBlock].
33.
Loop with Tail
Call Elimination SmallInteger to: limit byPositive: increment do: aBlock | nextIndex | aBlock value: self. nextIndex := self + increment. ^ nextIndex > limit ifFalse: [nextIndex to: limit byPositive: increment do: aBlock].
34.
Loop with Tail
Call Elimination False ifFalse: aBlock ^ aBlock value. <this block's closure class> value ^ nextIndex to: limit byPositive: increment do: aBlock.
35.
Language Features
36.
Traits
37.
Stateful Traits Name: IdentityHash Instance Variables: identityHash Methods: identityHash identityhash == nil ifTrue: [identityHash := Random integer]. ^identityHash
38.
Indexed instvars as
a trait
39.
Do you need both
concepts?
40.
Classes Compose...
41.
...but Do Not
Inherit
42.
Methods ● Compose as
in traits ● Rename or omit on conflict ● Can declare private ● No super send ● Special behavior of self send
43.
Instvars ● Private to
defining class ● Name conflicts impossible ● Indexed instvars – some fussing needed
44.
Abstract Class ● #basicNew
not understood ● “class” instvar not present
45.
Concrete Class ● Compose
one concrete class ...and only one
46.
Class Composition vs Object Composition
47.
Modules
48.
Variables ● Args and
temps ● Instance variables ● Module variables – Class names ● Class variables? – Compile-time constants
49.
Safety ● Privacy ● Teams
50.
Massively Single- threaded
51.
No String Literals
52.
Stream Literals 'Name: [name] Address: [address]'
53.
Status (detailed)
54.
Classes in the
Mist A Non- Traditional Smalltalk Gets Classy Martin McClure
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