Advanced Tool Architectures. Edited and Presented by Edward A. Lee, Co-PI UC Berkeley. Tool Projects. Chess Review May 10, 2004 Berkeley, CA
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1 Advanced Tool Architectures Edited and Presented by Edward A. Lee, Co-PI UC Berkeley Chess Review May 10, 2004 Berkeley, CA Tool Projects Concurrent model-based design Giotto (Henzinger) E machine & S machine (Henzinger) NP-Click (Keutzer) Streambit (Bodik) Metropolis (Sangiovanni-Vincentelli) Ptolemy II (Lee) Meta modeling GME (Sztipanovits, Vanderbilt) investigator in charge GREAT=Language,Engine,C/G,Debugger (Karsai, Vanderbilt) MOF-based Metamodeling (Sztipanovits, Vanderbilt) Verification Blast (Henzinger) CCured (Necula) Chic (Henzinger) SMoLES (Karsai, Vanderbilt) Chess Review, May 10,
2 Emphasis of Each Tool Concurrent model -based design Meta modeling Verification Giotto E/S machines NP-Click Streambit Metropolis Ptolemy II UML-OCL/GME GReAT/GME, GRE,C/G MOF/GME Blast CCured SMOLES Chic A particular concurrent, timed model of computation (MoC) O/S neutral run-time virtual machine Programming model for network processors Domain-specific language for bit stream processing Design refinement and mapping. MoCs and visualization of design. Modeling the modeling languages using UML class diagrams and OCL Modeling Model transformations using the GReAT Language, Transformation engine, Code Generator, Debugger Metamodeling using the Meta-Object Facility Model checking C programs. Making C programs more reliable. Simple Modeling Language for Embedded Systems with Timing Analysis (using Timed Automata) Checking interface compatibility in component compositions. Chess Review, May 10, A Common Approach in Many of These: Actor-Oriented Design Object orientation: class name data methods call return Actor orientation: actor name data (state) parameters ports Input data Output data What flows through an object is sequential control What flows through an object is streams of data A key theme is to identify the fundamentals of actor-oriented design and to show how to leverage a solid actor-oriented foundation to create domainspecific modeling languages (DSMLs) Chess Review, May 10,
3 Actor-Oriented Platforms Actor oriented models compose concurrent components according to a model of computation. Time and concurrency become key parts of the programming model. Chess Review, May 10, Actor Interfaces: Ports and Parameters input ports parameters: a 1 = value a 2 = value output port Example: p 1 p 2 p 3 input/output port port Chess Review, May 10,
4 Our Actor-Oriented Domain-Specific Modeling Languages: DSMLs Giotto time-triggered hard-real-time periodic tasks deterministic mode switching NP-Click push/pull semantics combines application modeling language with target architecture abstraction targeted towards network processors HyVisual continuous-time semantics with mode changes intended for hybrid systems modeling GME-generated languages (Vanderbilt) meta modeling synthesis of domain-specific visual languages Chess Review, May 10, Giotto and xgiotto: Time-Driven Languages Giotto Periodic hard-real-time tasks with precise mode changes. Lower frequency task: xgiotto Extended to support event triggering Higher frequency Task Deterministic task interaction. t t t+5ms t+5ms t+10ms t+10ms Giotto compiler targets the E Machine/S Machine Giotto model of computation also implemented in Ptolemy II Chess Review, May 10,
5 Giotto with a Visual Syntax The Giotto Director in Ptolemy II gives the diagram Giotto semantics. tasks defined using another MoC hierarchical modes Chess Review, May 10, Distributed E and S Machines A major challenge with embedded real-time systems is preserving predictability in distributed implementations. The E & S machine platforms provide such predictability. Chess Review, May 10,
6 NP-Click: A Programming Model for Network Processors Concurrent composition of elements for packet processing Elements communicate via ports that pass packets push: initiated by source element pull: initiated by sink element Salient features of target architecture threads data layout arbitration of shared resources Thread 0 FromDevice(0) ToDevice(0) Lookup IPRoute FromDevice(1) ToDevice(1) Thread 1 Thread 2 Chess Review, May 10, Click Router Application The Click director in Ptolemy II gives the diagram push/pull semantics. Chess Review, May 10,
7 StreamBit: Sketching bitstream programs What is StreamBit? language for developing bit-stream programs (e.g., crypto) but mainly, a case study in programming by sketching What is programming by sketching? separate Specification and Implementation Specification (correctness): an SDF-based DSL Implementation (performance): implementation strategy is only sketched; the compiler will derive the missing details What does this mean for the programmer? First, program without concern for performance Next, experiment with implementations w/out introducing bugs Sketching used to implement DES: a brief sketch achieved 600% performance increase over naïve implementation (within ¾ of a hand-tuned library) Chess Review, May 10, Frameworks Metropolis Unified model of computation (MoC) Formal semantics given w.r.t. this MoC Emphasis on joint modeling of hardware architecture and application Modeling of design constraints and assertions Ptolemy II Framework for experimentation with MoCs Many MoCs have been implemented discrete-event, continuous-time, dataflow, push/pull, process networks, CSP, FSMs, Emphasis on heterogeneous mixing of domainspecific MoCs. Chess Review, May 10,
8 Metropolis Framework Function Specification Design Constraints and Assertions Architecture (Platform) Specification Metropolis Infrastructure Design methodology Meta model of computation Base tools - Design imports - Meta-model compiler - Simulation Joint modeling of function, constraints, and implementation platform. Synthesis/Refinement Compile-time scheduling of concurrency Communication-driven hardware synthesis Protocol interface generation Analysis/Verification Static timing analysis of reactive systems Invariant analysis of sequential programs Refinement verification Formal verification of embedded software Chess Review, May 10, Ptolemy II Framework Basic Ptolemy II infrastructure: Director from a library defines component interaction semantics Type system Large, domain-polymorphic component library. Hierarchical components Visual editor Chess Review, May 10,
9 Hierarchical Heterogeneity continuous environment modal model Hierarchy allows distinct models of computation at distinct levels of the hierarchy. An abstract semantics defines the interaction across levels of hierarchy where the semantics differ. discrete controller example Ptolemy II model: hybrid control system Chess Review, May 10, Actor-Oriented Classes Objective is to bring modern modularity mechanisms to actor-oriented design: classes subclasses inheritance interfaces subtypes aspects Early, highly experimental prototype in Ptolemy II includes: classes, inheritance, inner classes interactive editing of class relationships Chess Review, May 10,
10 Example Using Actor-Oriented Classes local class definition execution instance instance inherited actors override actors subclass Chess Review, May 10, Meta Modeling Specifying and Integrating Tool Chains DSML Meta-Modeling Transformation Meta-Modeling Validation & Verification META-MODELING DESIGN FLOW AND TOOL CHAIN Meta-Generators Domain-Specific Tool Chains Meta-Models Transformation Meta-Models Valid Meta-Models Model Transformation Tools Design Feedback UML-OCL MOF/GME UMT/GME GRE GR-DEBUG C/G Automotive Others Modeling Controller Synthesis System Analysis Code Generation DOMAIN-SPECIFIC DESIGN FLOWS AND TOOL CHAIN Validation Verification Platform Models Target Analysis Platform Test Vectors Plant Model Integrated Model Valid Model Code/Model Valid Code/ Model Download Design Feedback Valid Model Design Feedback Ptolemy II Metropolis GME HyVisual DESERT Ptolemy II Metropolis Ptolemy II Metropolis Giotto Chic Blast CCured E/S machines O/S Processor Chess Review, May 10,
11 GReAT: Model Transformation Tool Chain Meta-models MetaModel of Source uses MetaModel of Domain-to-Target Mapping uses MetaModel of Target Metaprogrammable tools configures Meta-Programmable Modeling Tool configures Code Generator generates C/G GRE GME describes creates Meta-Programmable Transformation Tool describes DEBUG Debugger Generated tool (Generated) Transformation Tool Models and applications Source Models Target/Executable Models Target Platform Tools: Tools: UMT UMT Language, Language, GRE GRE (engine), (engine), C/G, C/G, GR-DEBUG GR-DEBUG Chess Review, May 10, Verification Blast Scalable verification through lazy refinement of the state space. CCured Static analysis of C programs for type safety. Where static analysis fails, run-time checks are added automatically. Chic Expresses assumptions made by module about environment, and guarantees made by module if assumptions are satisfied. Checks compatibility of interfaces of composed components. Both based on CIL (C Intemediate Language), a representation of C code along with a set of tools that permit easy analysis and source-tosource transformation. Chess Review, May 10,
12 Many In-Depth Talks have a Tools Element 10:10-11:10 a.m. Event-driven Real-Time Programming (Arkadeb Ghosal and Tom Henzinger) A Comparison of Network Processor Programming Environments (William Plishker and Kurt Keutzer) Classes and Inheritance in Actor-Oriented Models (Stephen Neuendorffer and Edward A. Lee) 2:00-3:00 p.m. Metropolis, an Environment for System-level Design (Abhijit Davare and Alberto Sangiovanni-Vincentelli) StreamBit: Sketching Implementations for Bitstream Programs (Armando Solar-Lezama and Ras Bodik) Verifying Data Structure Invariants in Device Drivers (Scott McPeak and George Necula) Chess Review, May 10, Many Posters have a Tools Element Wireless Sensor Network Design Methodology galsc: A Language for Event-Driven Embedded Systems Metamodeling Infrastructure for Model-Integrated Computing Distributed Diagnosis Algorithm Multiple Aspect Modeling Front-End for SIGNAL Online supervisory control Platform-based Design for Mixed Analog-Digital Designs Distributing Giotto Hierarchical Reconfiguration of Dataflow Models Fault Tolerant Design of Distributed Automotive Systems Modeling of Sensor Nets in Ptolemy II Chess Review, May 10,
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