Towards a flexible Pharo Compiler
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ESUGThe document discusses problems with the existing Pharo compiler and proposes a new compiler framework called OPAL. The current compiler has issues with reusability, lack of parametrization, and complex mapping between source code and bytecode. OPAL addresses these by using an AST, explicit compiler contexts, and pluggable visitors. It separates the AST from compilation allowing reuse and maps source directly to an intermediate representation for debugging.
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Analyzing Dart Language with Pharo: Report and early results
This document summarizes an analysis of the Dart programming language using tools in the Pharo environment. It describes generating a parser for Dart using SmaCC, which produces an AST. It also details defining a Famix meta-model for Dart and the Chartreuse-D importer that creates a FamixDart model from the AST. Future work is outlined, including improving SmaCCDart, continuing to develop the FamixDart meta-model, and handling dynamic types when importing associations. The goal is to analyze Dart and explore modeling Flutter applications.
Transpiling Pharo Classes to JS ECMAScript 5 versus ECMAScript 6
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A Unit Test Metamodel for Test Generation
The document presents an approach for automated test generation from software models and execution traces. Key aspects of the approach include using metamodels to represent the codebase, values, and desired unit test structure. Models are built from the codebase and traces, then transformations are applied to generate unit tests conforming to the test metamodel. Abstract syntax trees are used to export the generated tests to code. The approach aims to generate tests that are relevant, readable and maintainable without relying on existing tests. An example demonstrates generating a JUnit test from an application class.
Creating Unit Tests Using Genetic Programming
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Threaded-Execution and CPS Provide Smooth Switching Between Execution Modes
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Exploring GitHub Actions through EGAD: An Experience Report
This document summarizes an experience report on exploring GitHub Actions through EGAD, a tool for GitHub Action analysis. It discusses three key lessons learned: 1) Composing a story by documenting tasks and linking documentation to code, 2) Navigating custom views to conduct research, and 3) Supporting onboarding of researchers by assigning mentors, scheduling meetings, and encouraging use of resources. EGAD takes workflow YAML files, wraps them in a domain model to provide context, and allows inspecting examples to fully explore the GitHub Actions domain model.
Pharo: a reflective language A first systematic analysis of reflective APIs
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Garbage Collector Tuning
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Improving Performance Through Object Lifetime Profiling: the DataFrame Case
This document discusses improving garbage collection performance in Pharo through object lifetime profiling. It presents Illimani, a lifetime profiler developed for Pharo. Illimani was used to profile the lifetimes of objects created when loading a large DataFrame. The profiling revealed that most objects had short lifetimes, suggesting the garbage collector could be tuned. Tuning the garbage collector parameters based on the lifetime profiles improved the performance of loading the DataFrame.
Pharo DataFrame: Past, Present, and Future
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thisContext in the Debugger
This document discusses issues with thisContext in the Pharo debugger not correctly representing the execution context and being the DoIt context instead. This was fixed in Pharo12 by making thisContext a variable object that is wrapped in a DoItVariable, so the debugger context is used. When inspecting or doing DoIt, the doIt Variable is pushed and read to provide the proper execution context.
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ShowUs: PharoJS.org Develop in Pharo, Run on JavaScript
This document discusses PharoJS, which allows developers to develop applications in Pharo and then export them to run as JavaScript applications. PharoJS enables 100% of Pharo code to be executed during development, and then 100% of that same code is exported to JavaScript to be executed in production. The document also briefly mentions deployment options for exported PharoJS applications like GitHub Pages and GitHub Actions.
Advanced Object- Oriented Design Mooc
The document contains testimonials from participants of the Pharo MOOC praising its effectiveness at teaching object-oriented design. It also announces an upcoming advanced design MOOC that will have over 60 lectures, slides, videos and an exercise booklet. Finally, it provides links to the course websites and encourages people to stay tuned for the new MOOC.
A New Architecture Reconciling Refactorings and Transformations
This document discusses reconciling refactorings and transformations in software engineering. It proposes a new architecture where refactorings decorate transformations by checking preconditions and composing multiple transformations. Refactorings ensure transformations are applied safely while transformations focus on model changes. Open questions remain around precondition handling and composition semantics. The goals are to reduce duplication, support custom refactorings/transformations, and provide a modern driver-based user interface.
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- 1. Towards a flexible Pharo Compiler Clement Bera and Marcus Denker
- 2. Three Problems • Architecture is not reusable • Compiler can not be parametrized • The mapping between source code and bytecode is overly complex.
- 3. Reusability • AST is special for the Compiler • Tools use own AST (RB) • AST is destroyed when compiling • No reusable backend/parser...
- 4. No Parametrization • No pluggable archicture • Parser, code generator fixed • No infrastructure for compiler options
- 5. Mapping bc2source • For the Debugger, we need to map bytecode to source offsets • With closures, we need to map temp offsets to real temps. Old Compiler: Encoder builds complex table structure
- 6. Solution: OPAL • New compiler framework for Pharo • Default compiler in Pharo3 • Old Compiler will be a loadable package
- 7. Design • RB AST • Visitors • Bytecode level IR Smalltalk source code Refactoring browser abstract syntax tree Intermediate representation Bytecode RBParser ASTTranslator + IRBuilder IRByteCodeGenerator OCSemanticAnnotator
- 8. Reusability • AST is unchanged • Backend independent AST Interpreter Oz/Hazelnut Reflectivity Metalinks Class Builder Smart suggestions Node navigation
- 9. Parametrization • Explicit compiler context • All visitors are pluggable Smalltalk source code Refactoring browser abstract syntax tree Intermediate representation Bytecode Compilation context
- 10. Compiler Options • Turn off inlining of ifTrue: and friends MyClass>>foo <compilerOptions: - optionInlineIf> ^ #myNonBooleanObject ifTrue: [ 1 ] ifFalse: [ 0 ]
- 11. Mapping • Mapping uses AST directly source codeBytecode foo ^ 1 + 2 + 3 76 77 B0 20 B0 7C IRMethod RBMethodNode RBSequenceNode RBReturnNode RBMessageNode 1 RBLiteral ValueNode 1 IRPushLiteral IRSequence RBLiteral ValueNode 1 IRPushLiteral RBLiteral ValueNode 2 IRReturn RBReturnNode IRSend RBMessageNode 1 IRPushLiteral RBLiteral ValueNode 3 RBMessageNode 2 RBLiteral ValueNode 3 IRSend RBMessageNode 2 B0 + 2 1 2 3 + 2 + 3 ^ 1 + 2 + 3 ^ 1 + 2 + 3 foo ^ 1 + 2 + 3 RBLiteral ValueNode 2
- 12. Performance • Visitors and IR do cost a bit of speed • But not much
- 13. Conclusion • Opal solves the problems of the old compiler • Important basis for many features you will see in Pharo3 and Pharo4
- 14. Conclusion • Opal solves the problems of the old compiler • Important basis for many features you will see in Pharo3 and Pharo4 Questions?