npm run build

run:

npm start

and go to http://127.0.0.1:5000/

you can click on any of the files listed under "benchmarks" or write a function yourself in the editor.

choose a benchmark from the drop down list below "benchmarks"

to verify it click on "verify"

to try to generate invariants using horn click on "verify w/ horn"

on the left there's a code editor where you can change the current function or write a new one

when verification fails you can view the paths that made it fail by choosing a path from the dropdown list.

you'll get the proposition that failed, the path's reachability condition, its transformation relation and a counterexample

when verify w/ horn succeeds the invariants will be listed and their locations can be viewed in the editor by clicking on the corresponding locate button

python3 test.py

• support switch
• properly handle for
• support explicit casts
• support implicit casts
• handle fixed size ints as bitvectors
• implement an is_nan() operator
• make the parser work with float literals
• implement phantom variables
• implement assume()
• implement a simple gui
• add source locations to the cfg
• implement a gui for horn (invariants synthesis)
• (horn) allow providing partial invariants
• (horn, gui) highlight cut points

• requires(prop)
• ensures(prop)
• assert(prop)
• freeze(id, expr) :: declares a phantom variable id and stores expr in it
• remember(prop) :: adds prop to all asserts following it
• phantom(statement) :: surrounds a statement that's used only by the verifier (e.g. assigning to a phantom variable)
• assume(prop) :: lets the verifier assume that prop holds in that point
• then(expr, prop) :: implication
• then(expr, prop1, prop2) :: if-then-else
• forall(id, range(expr1, expr2), prop) :: universal quantifier (for a range of integers)
• exists(id, range(expr1, expr2), prop) :: existential quantifier (for a range of integers)