'Worklist algorithm' presentation slideshows

Worklist algorithm

Worklist algorithm. Initialize all d i to the empty set Store all nodes onto a worklist while worklist is not empty: remove node n from worklist apply flow function for node n update the appropriate d i , and add nodes whose inputs have changed back onto worklist. Worklist algorithm.

601 views • 59 slides

Administrative stuff

Administrative stuff. Office hours: After class on Tuesday. 1: x := ... 2: y := ... 3: y := ... 4: p :=. ... x ... 5: x := ... ... y. ... x ... 6: x := ... 7: *p :=. ... x ... ... y ... 8: y :=. Worklist algorithm. Initialize all d i to the empty set

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Recap: Reaching defns algorithm

Recap: Reaching defns algorithm. From last time: reaching defns worklist algo We want to avoid using structure of the domain outside of the flow functions. Will use lattices!. while (worklist.empty.not) do let n := worklist.remove_any; let info_in := m(n.incoming_edges);

369 views • 36 slides

Bebop : A Symbolic Model Checker for Boolean Programs

Bebop : A Symbolic Model Checker for Boolean Programs. Thomas Ball Sriram K. Rajamani. http://research.microsoft.com/slam/. Outline. Boolean Programs and Bebop What? Why? Results Demo Semantics of Boolean Programs Technical details of algorithm Evaluation Related Work.

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Formalization of DFA using lattices

Formalization of DFA using lattices. Recall worklist algorithm. let m: map from edge to computed value at edge let worklist: work list of nodes for each edge e in CFG do m(e) := ; for each node n do worklist.add(n) while (worklist.empty.not) do let n := worklist.remove_any;

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Recap

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Termination

427 views • 29 slides

Lub and glb

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Lub and glb

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Back to termination

Back to termination. So if F is monotonic, we have what we want: finite height ) termination, without the outer join Also, if the local flow functions are monotonic, then global flow function F is monotonic. Another benefit of monotonicity.

178 views • 17 slides