Reflectivity Demo

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Reflectivity Demo (Dyla07, ECOOP 2007)

Reflectivity Demo (Dyla07, ECOOP 2007)

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  • 1. The Reflectivity Marcus Denker with: David Röthlisberger Philippe Marschall Nik Haldiman Adrian Lienhard / Lukas Renggli Eric Tanter Stephane Ducasse Oscar Nierstrasz © Marcus Denker
  • 2. Structural Reflection > Structure modeled as objects — e.g. Classes, methods — Causally connected > Uses: — Development environments — Language extensions and experiments © Marcus Denker
  • 3. Methods and Reflection > Method are Objects — e.g in Smalltalk > No high-level model for sub-method elements — Message sends — Assignments — Variable access > Structural reflection stops at the granularity of methods © Marcus Denker
  • 4. Sub-Method Reflection > Many tools work on sub method level — Profiler, Refactoring Tool, Debugger, Type Checker > Communication between tools needed — example: Code coverage > All tools use different representations — Tools are harder to build — Communication not possible © Marcus Denker
  • 5. Solution: Reflective Methods > Annotated, persistent AST > Bytecode generated on demand and cached :ReflectiveMethod :CompiledMethod annotation compiledMethod #(12 13 45 38 98 128 annotation reflectiveMethod 84 72 42 77 22 28 59 32 7 49 51 87 64) Tools VM © Marcus Denker
  • 6. Reflectivity > Implementation of Reflective Methods for Squeak Smalltalk > Smalltalk Compiler generates Reflective Methods — Translated to Bytecode on demand > Open Compiler: Plugins — Generator plugin: called before code generation – Transform a copy of the AST — Analysis plugin: called after name analysis © Marcus Denker
  • 7. DEMO I > Show invalidation of code > Show assert Demo © Marcus Denker
  • 8. Reflective Methods: Annotations > Source visible annotations — extended Smalltalk syntax (9 raisedTo: 10000) <:evaluateAtCompiletime:> > Source invisible annotations — Reflective API — Can reference any object > Every node can be annotated > Semantics: Compiler Plugins © Marcus Denker
  • 9. Example: Pluggable Type-System > Example for textual annotations bitFromBoolean: aBoolean <:type: Boolean :> ^ (aBoolean ifTrue: [1] ifFalse: [0]) <:type: Integer :> > Optional, pluggable type-system > Types stored as annotations in the Reflective Methods © Marcus Denker
  • 10. Reflex: Partial Behavioral Reflection > Hooksets: collection of operation occurrences > Links — Bind hooksets to metaobjects — Define Protocol between base and meta metaobject > Goals — Highly selective reification links activation condition — Flexiblel metalevel engineering – Protocol specification hookset – Cross-cutting hooksets Tanter, OOPSLA03 © Marcus Denker
  • 11. Links as Annotations > Links can be annotations on the AST Meta Link © Marcus Denker
  • 12. Demo II: Geppetto > Show Bounce Demo > Show Coverage Demo © Marcus Denker
  • 13. Future Work > Optimize Size of AST Representation — Simpler AST — AST Compression > Contextual Reifications — Context depended Links > Beyond Text — Store only AST (no text) — Build text from annotated AST © Marcus Denker