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RESYN'09
March 2009Newcastle upon Tyne1
Workcraft – a Framework for Interpreted Graph Models
Ivan Poliakov, Arseniy Alekseyev,Victor Khomenko, Alex Yakovlev
RESYN'09
March 2009Newcastle upon Tyne2
Interpreted Graph Models
• Static graph structure – Nodes– Arcs
• Additional entities– Tokens– Node states– Arc states– Etc
• Examples:– Petri Nets– Static Data Flow Structures– Gate-level circuits
RESYN'09
March 2009Newcastle upon Tyne3
Petri Nets as a low-level 'language'
• Many high-level models do not have sufficiently developed theory and associated tools
• Petri Nets have exensive theory and many efficient tools
• Approach: convert high-level models into PNs for analysis/verification
RESYN'09
March 2009Newcastle upon Tyne4
Verification workflow
RESYN'09
March 2009Newcastle upon Tyne5
Workcraft
• A tool for working with IGMs– Visual editing– Interactive simulation– Automated verification• For researchers:
– define new Interpreted Graph Models– inherit visual editing and simulation features of the
framework• For system designers
– a consistent framework for different formalisms– convenient analysis and verification functions
RESYN'09
March 2009Newcastle upon Tyne6
Workcraft GUI overview
RESYN'09
March 2009Newcastle upon Tyne7
Working with models
• Creating new model
RESYN'09
March 2009Newcastle upon Tyne8
Working with models
• Simulation
• Modes:– Automatic– Interactive– Trace-replay
• Step-by-step
RESYN'09
March 2009Newcastle upon Tyne9
Model interoperability
RESYN'09
March 2009Newcastle upon Tyne10
More complex interoperability
RESYN'09
March 2009Newcastle upon Tyne11
Use case — Static Data Flow Verification
Original state
Deadlock state
29 steps
RESYN'09
March 2009Newcastle upon Tyne12
Use case — Asynchronous circuit verification
Hazard caused by wiredelay
RESYN'09
March 2009Newcastle upon Tyne13
Summary
• Workcraft is a framework for Interpreted Graph Models– Provides visual editing and simulation features– Provides automated verification features
• Workcraft has been used in several real-life cases– SDFS verification– Circuit verification (e.g. the design of a multiresource
arbiter by Golubcovs et al.)– CPOG-based synthesis
• Available free for academic use at– async.org.uk/workcraft
RESYN'09
March 2009Newcastle upon Tyne
Workcraft 2
Almost complete rewrite of Workcraft 1:
• No longer OpenGL dependent– visualisation engine switched from custom-written to
Java2D– much better portability
• Customisable multi-window interface– Persistent docking layout– Hideable utility windows
RESYN'09
March 2009Newcastle upon Tyne
Workcraft 2 (cont.)
• Logical model data and visual data are separate– Logical models can exist without visual data– Import from files without visual data is allowed (such
as .g)– Visual data can be attached on-the-fly
• Console mode– JavaScript-based command line– Scriptable batch processing
RESYN'09
March 2009Newcastle upon Tyne16
Use case – Balsa circuit re-synthesys
– Visualisation of Balsa net-lists– Generation of STGs for individual HS components– STG composition of the entire HS circuit
RESYN'09
March 2009Newcastle upon Tyne17
Individual component STGs
• "SequenceOptimised" component STG
"Concur" component STG
RESYN'09
March 2009Newcastle upon Tyne18
Resulting STG composition
•
activate
out0
out1
out2
out3
RESYN'09
March 2009Newcastle upon Tyne
(tool demo)
