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JMethods

Replacing CompiledMethod with something better

Prioritaet: AST position paper. Deadline: 19.5

Dann: Plan Master

  • Zeitplan
  • Inhaltsplan
  • Besprechung mit Stef

Deadline: 1. Juni

Dann:

  • Implementierung + Experimente
  • Wenn moeglich, Paper.
  • TOC Master, sync with Stef
  • Dann ausarbeitung Master
  • Fertig.

Zeitplan

ende Juni: First draft of Table of Contents, besserer Name
ca. 15.9.06: Anfang schreiben Master
1.11.06 --> Abgabe.
Note kommt dann Anfang / Mitte Januar
  1. TOC
  2. Names
  3. Talk Ideas

Ideen before/after Code für Methoden

  • <before>. <code> ensure: <after>
    • einfach zu implementieren
    • vergleichsweise kleiner overhead
    • kein Zugriff auf Resultat, keine Manipulation von Argumenten
  • MethodWrapper mit alter Methode in Literal
    • Zugriff auf Resultat, einfache Manipulation von Argumenten
    • etwas grösserer Overhead (MethodContext statt BlockContext)
    • funktioniert mit primites

Todo shortterm

  • besserer Name für ByteNurse
  • search / rewrite rule
  • return value instrumentation for method
  • introduce temp at method level and use in instrumentations
  • choose compilation strategy based on instrumentations
  • self modifying code: self refactoring code (rename senders ...)
    • api migration: html divNamed: do: -> html div id: ; with:
  • move before/after method to MethodNode
  • #readsField: #wirtedField:
  • #replace: -> #instead:
  • http://www.squeaksource.com/Gutenberg.html
  • annotations that don’t appear in the sourcecode -> tests
  • version button shows original method too, do we want that?
  • estimate overhead better
  • when recompiling method, should properties stay?
  • improve and test ByteNurse
    • result of message
  • implement #messages of JCompiledMethod with a visitor
  • annotated annotations?
  • ...
  • compiling really long methods with really many literals speed comparision
  • #removeUnusedTemp:
  • look at Monticello 2 Model
  • breakpoint
test1
	self  assert: ( 1 &lt; 2).
  • work in ast interface, #dontInline, #evaluateAtCompiletime
  • before/after code for method, => method wrapper ?

Todo longterm

  • Transactional memory
    • for each message sent in a method make an atomic_ none
    • change all sends to the atomic one
    • before an assignment to an istance variable log old value and self
    • maker when entered an exited, not for atomic_ ones
  • Lint
  • just pretty print
  • comments
  • title for project
  • make self in browser refer to method
  • bring world peace by increasing CompiledMethod codequality

Done

  • colorer
  • <asJavascript>
  • interpreter
  • instrument for one object only
  • metasends
    • tests
    • instvars
    • to objects (in literals)
  • evaluate at compiletime
  • why do tests take so long? -> #compileAll, fixed
  • do what ByteSurgeon does on the AST
  • block with pseudovariables as blockarguments for instrumentation #decompile #printString
  • rename JCompiledMethod to JMethod (and accessors too)
  • multivalued annotations
  • provide ByteSurgeon interface: #instrument:, #isSend, #isInstVarAccess, ....
  • annotate the AST with #before:, #after:, #instead:
  • make ASTTranslator that is aware of that
  • make RBFormatter that is aware of that
  • make sure JFormatter works with several annotations
  • instrumentation fucks up temp names
  • rename arguments and temps via manipulating AST (RenameTemporaryRefactoring>>#renameNode:)
  • annotate expression as assertion, don’t compile it when in deployment mode (ASTTranstlator again)
  • annotate AST
    • create new syntax: (primary) <annotationKey: annotationValue>
    • no inline: (unknown ifTrue: [ ... ]) <noInline>
    • introduce Unknown Boolean
    • assertions: (aReceiver size > 5)<assertion> , transfrom ast before translating it
    • make RBProgramNodeVistor subclass that is avare of annotations and transforms ast
    • make RBFormatter subclass that is avare of annotations
    • ByteNurse, like ByteSurgeon just simpler, (true := false)<instead: (Transcript show: ’nono’) >
  • look at Java Annotations
  • make it work on 3.9
  • removed 5 unneeded classes
  • make project wiki
  • rename method via manipulating AST
    • generated sourcecode with pretty prining
    • generated bytecode via ASTTranslator -> IR
    • stop VM from segfaulting
    • wirte new code into changeset
    • keep method category after changing AST
    • make versions button work
    • notify browser of method change
  • estimate overhead
  • properties for CompiledMethod and JCompiledMethod
    • CompiledMethod knows JCompiledMethod via properties
  • only AST and CompiledMethod are stored in a JCompiledMethod
    • AST is used for high-level stuff
    • CompiledMethod is used for low level stuff
  • use new instead of old compiler
  • Compiler generates JCompiledMethod instead of CompiledMethod
  • shold #assertedNodes move to a ASTTranslator,
  • make Annotation object not association
  • move ast to goods, magma, omnibase, bad results for all
  • title for presentation

Postponed

  • compress AST (externally), first results show olny 33% decrease in size
  • compile whole image, watch size increase

Why and What

  1. MOP: Gepetto
  2. AOP
  3. Tools (don’t always parse), compiler aware of annotations (inlining, assertions, ...)
  4. Typesystems (pluggable [notNull, escapedString])
  5. Reflection (?Structure Model?)
  6. VCS
  7. Eiffel, pre/postcondition
  8. refactorings

What not

  1. optimizing compiler (JIT)
  2. slim binaries
  3. code as xml

Why Method + BR AST

More structure than just a list (Lisp). Closer to the mental model of the programmer

Tools Ideas

  • pretty print
  • syntax highlight
  • compiler
  • breakpoint (release compile, strip source)
  • assertion
  • vcs (diff, merge, treematching, ...)
  • metainformation about method (author, timestamp, comment, links, documentation, estimated price, how often invoked ...)
    • annotations
  • xml
  • lint
  • refactorings (browser)
  • interpreter

Done, mini-Overview

  • <evaluteAtCompiletime>
  • <noInline>
  • <assertion>
  • instrumentation, aMethod #insturment/Messages/Assignments/Variables/Literals:, #insertAfter:/#insertBefore:/#replace:/#metasendTo:, blocks with pseudovariables as arguments
    • metasend, to any object
 	method instrumentMessages: \[ :node |
		node isSelfSend ifFalse: \[
			node metasendTo: recorder ] ].
  • variables
	method instrumentVariables: \[ :node |
		(node isInstance and: \[ node isRead ]) ifTrue: \[
			node replace: \[ :name | self perform: name ] ] ].
  • assignments
	method instrumentAssignments: \[ :node |
		node insertAfter: \[ :variable | variable := variable + 30000 ] ].
  • messages
	method instrumentMessages: \[ :node |
		node insertAfter: \[ receiver - argument ] ].
  • same only for one object without runtime check!
  • worked on db storage, failed (possibly recompile goods with gcc 2.95)
  • improved ast-api, MessageNode>>#isSelfSend, VariableNode>>#isRead/#isWrite/#isGlobal/#isInstance/#isTemp

Future ideas

  • build something that is usable ;)
    • tracer (for tests?)
    • redirect self-sends (OmniBase, Lukas, Avi)
    • fast block decompile (javascript, lukas)

Problems

  • Tools
  • Debugger
  • incremental syntax highlight

Todo outside of project

  • same thing for classes, annotations for classes and intance variables

Links:

Rethinking code documentation RNA http://dawis2.informatik.uni-essen.de/site/staff/shanenbe/projects/FreeAnnotations/ http://www.iam.unibe.ch/~denker/temp/treevsbytes/ http://kasoft.freeyellow.com/Central/Kasoft/Typeset/JavaTree/index.html http://intentsoft.com/ http://www.edge.org/digerati/simonyi/simonyi_p2.html http://martinfowler.com/articles/languageWorkbench.html

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Last changed by admin on 21 April 2009